lazyload experiment: separate libraries

FossilOrigin-Name: 8660559c9b7b280bd5113dfcb54bb4a0a2ef0bda65036c0fbe6c1a4dfc9ba8a1

12 files changed, 2068 insertions, 0 deletions

diff --git a/lib/all.do b/lib/all.do
new file mode 100644
index 0000000..3c790b4
--- /dev/null
+++ b/lib/all.do
@@ -0,0 +1,3 @@
+redo-always
+redo-ifchange cpt lib-cpt
+rm -f "$3"
diff --git a/lib/clean.do b/lib/clean.do
new file mode 100644
index 0000000..b44c68a
--- /dev/null
+++ b/lib/clean.do
@@ -0,0 +1,2 @@
+redo-always
+rm -f lib-cpt cpt "$3"
diff --git a/lib/cpt-deps b/lib/cpt-deps
new file mode 100755
index 0000000..1429ae9
--- /dev/null
+++ b/lib/cpt-deps
@@ -0,0 +1,177 @@
+# Dependeny and ordering functions
+
+pkg_depends() {
+    # Resolve all dependencies and generate an ordered list.
+    # This does a depth-first search. The deepest dependencies are
+    # listed first and then the parents in reverse order.
+    contains "$deps" "$1" || {
+        # Filter out non-explicit, aleady installed dependencies.
+        # Only filter installed if called from 'pkg_build()'.
+        [ "$pkg_build" ] && [ -z "$2" ] &&
+            (pkg_list "$1" >/dev/null) && return
+
+        while read -r dep type || [ "$dep" ]; do
+            # Skip comments and empty lines.
+            [ "${dep##\#*}" ] || continue
+            # Skip test dependencies unless $CPT_TEST is set to 1.
+            #
+            # Skip make dependencies on the 'tree' operation for child packages
+            # or when the 'first-nomake' argument is given.
+            case $type in
+                test) [ "$CPT_TEST" = 1 ] || continue ;;
+                make) [ "$2" = tree ] && [ -z "${3#first-nomake}" ] && continue
+            esac
+
+            # Recurse through the dependencies of the child packages. Forward
+            # the 'tree' operation.
+            if [ "$2" = tree ]; then
+                pkg_depends "$dep" tree
+            else
+                pkg_depends "$dep"
+            fi
+        done 2>/dev/null < "$(pkg_find "$1")/depends" ||:
+
+        # After child dependencies are added to the list,
+        # add the package which depends on them.
+        [ "$2" = explicit ] || [ "$3" ] || deps="$deps $1 "
+    }
+}
+
+pkg_order() {
+    # Order a list of packages based on dependence and
+    # take into account pre-built tarballs if this is
+    # to be called from 'cpt i'.
+    order=; redro=; deps=
+
+    for pkg do case $pkg in
+        *.tar.*) deps="$deps $pkg "  ;;
+        *)       pkg_depends "$pkg" raw
+    esac done
+
+    # Filter the list, only keeping explicit packages.
+    # The purpose of these two loops is to order the
+    # argument list based on dependence.
+    for pkg in $deps; do ! contains "$*" "$pkg" || {
+        order="$order $pkg "
+        redro=" $pkg $redro"
+    } done
+
+    deps=
+}
+
+pkg_fix_deps() {
+    # Dynamically look for missing runtime dependencies by checking each binary
+    # and library with either 'ldd' or 'readelf'. This catches any extra
+    # libraries and or dependencies pulled in by the package's build suite.
+    log "$1" "Checking for missing dependencies"
+
+    # Go to the directory containing the built package to
+    # simplify path building.
+    cd "$pkg_dir/$1/$pkg_db/$1"
+
+    # Make a copy of the depends file if it exists to have a
+    # reference to 'diff' against.
+    if [ -f depends ]; then
+        cp -f depends "$mak_dir/d"
+        dep_file=$mak_dir/d
+    else
+        dep_file=/dev/null
+    fi
+
+    # Generate a list of all installed manifests.
+    pkg_name=$1
+    set +f; set -f -- "$sys_db/"*/manifest
+
+    # Get a list of binaries and libraries, false files
+    # will be found, however it's faster to get 'ldd' to check
+    # them anyway than to filter them out.
+    find "$pkg_dir/$pkg_name/" -type f 2>/dev/null |
+
+    while read -r file; do
+        case ${elf_prog:-ldd} in
+            *readelf) "$elf_prog" -d "$file" 2>/dev/null  ;;
+            *)        ldd "$file" 2>/dev/null  ;;
+        esac |
+        while read -r dep; do
+            # Skip lines containing 'ldd'.
+            [ "${dep##*ldd*}" ] || continue
+            case $dep in *NEEDED*\[*\] | *'=>'*) ;; *) continue; esac
+
+            # readelf output:
+            # 0x0000 (NEEDED) Shared library: [libc.so]
+            dep=${dep##*\[}
+            dep=${dep%%\]*}
+
+            # ldd output:
+            # libc.so => /lib/ld-musl-x86_64.so.1
+            dep=${dep#* => }
+            dep=${dep% *}
+
+            # Figure out which package owns the file. Skip file if it is owned
+            # by the current package. This also handles cases where a '*-bin'
+            # package exists on the system, so the package manager doesn't think
+            # that the package we are building depends on the *-bin version of
+            # itself, or any other renamed versions of the same software.
+            pkg_owner -l "/${dep#/}\$" "$PWD/manifest" >/dev/null && continue
+            pkg_owner -l "/${dep#/}\$" "$@" ||:
+        done ||:
+    done >> depends
+
+    # Remove duplicate entries from the new depends file.
+    # This removes duplicate lines looking *only* at the
+    # first column.
+    sort -uk1,1 -o depends depends 2>/dev/null ||:
+
+    # Display a diff of the new dependencies against the old ones.
+    diff -U 3 "$dep_file" depends 2>/dev/null ||:
+
+    # Remove the depends file if it is empty.
+    [ -s depends ] || rm -f depends
+}
+
+pkg_get_base() (
+    # Print the packages defined in the /etc/cpt-base file.
+    # If an argument is given, it prints a space seperated list instead
+    # of a list seperated by newlines.
+
+    # cpt-base is an optional file, return with success if it doesn't exist.
+    [ -f "$CPT_ROOT/etc/cpt-base" ] || return 0
+    nonl=$1; set --
+
+    # Older versions of shellcheck warns us that the variable is changing on the
+    # subshell. That is our purpose here, thank you very much.
+    # shellcheck disable=SC2030
+    while read -r pkgname _; do
+        [ "${pkgname##\#*}" ] || continue
+        set -- "$@" "$pkgname"
+    done < "$CPT_ROOT/etc/cpt-base"
+    if [ "$nonl" ]; then printf '%s ' "$@"; else printf '%s\n' "$@"; fi
+)
+
+pkg_gentree() (
+    # Generate an ordered dependency tree of a package. Useful for testing
+    # whether the generated dependency tree is enough to actually building a
+    # given package. A second argument can be given as a combination of
+    # characters (similar to 'tar(1)' keys) which will be used as an option
+    # parser. See the documentation for more information on the keys.
+    # shellcheck disable=2030
+    deps='' reverse='' nonl='' make_deps=first
+    for op in $(sepchar "$2"); do
+        case "$op" in
+            b) deps="$(pkg_get_base nonl)" ;;
+            x) make_deps=first-nomake ;;
+            r) reverse=1 ;;
+            n) nonl=1 ;;
+            *) return 1
+        esac
+    done
+    pkg_depends "$1" tree "${make_deps:+first}"
+    eval set -- "$deps"
+    pkg_order "$@"
+    if [ "$reverse" ]; then eval set -- "$redro"; else eval set -- "$order"; fi
+    if [ "$nonl" ];    then printf '%s ' "$@"; else printf '%s\n' "$@"; fi
+)
+
+# Local Variables:
+# mode: sh
+# End:
diff --git a/lib/cpt-getoptions b/lib/cpt-getoptions
new file mode 100644
index 0000000..874325d
--- /dev/null
+++ b/lib/cpt-getoptions
@@ -0,0 +1,245 @@
+# This is the public domain getoptions shell library. It also forms a usage
+# function.
+# URL: https://github.com/ko1nksm/getoptions (v2.0.1)
+# License: Creative Commons Zero v1.0 Universal
+# shellcheck disable=2016
+getoptions() {
+    _error='' _on=1 _off='' _export='' _plus='' _mode='' _alt='' _rest=''
+    _opts='' _help='' _indent='' _init=@empty IFS=' '
+
+    for i in 0 1 2 3 4 5; do
+        eval "_$i() { echo \"$_indent\$@\"; }"
+        _indent="$_indent       "
+    done
+
+    quote() {
+        q="$2'" r=''
+        while [ "$q" ]; do r="$r${q%%\'*}'\''" && q=${q#*\'}; done
+        q="'${r%????}'" && q=${q#\'\'} && q=${q%\'\'}
+        eval "$1=\${q:-\"''\"}"
+    }
+    code() {
+        [ "${1#:}" = "$1" ] && c=3 || c=4
+        eval "[ ! \${$c:+x} ] || $2 \"\$$c\""
+    }
+
+    invoke() { eval '"_$@"'; }
+    prehook() { invoke "$@"; }
+    for i in setup flag param option disp msg; do
+        eval "$i() { prehook $i \"\$@\"; }"
+    done
+
+    args() {
+        on=$_on off=$_off export=$_export init=$_init _hasarg=$1
+        while [ $# -gt 2 ] && [ "$3" != '--' ] && shift; do
+            case $2 in
+                -?) [ "$_hasarg" ] || _opts="$_opts${2#-}" ;;
+                +*) _plus=1 ;;
+                [!-+]*) eval "${2%%:*}=\${2#*:}"
+            esac
+        done
+    }
+    defvar() {
+        case $init in
+            @none) : ;;
+            @export) code "$1" _0 "export $1" ;;
+            @empty) code "$1" _0 "${export:+export }$1=''" ;;
+            @unset) code "$1" _0 "unset $1 ||:" "unset OPTARG ||:; ${1#:}" ;;
+            *)
+                case $init in @*) eval "init=\"=\${${init#@}}\""; esac
+                case $init in [!=]*) _0 "$init"; return 0; esac
+                quote init "${init#=}"
+                code "$1" _0 "${export:+export }$1=$init" "OPTARG=$init; ${1#:}"
+        esac
+    }
+    _setup() {
+        [ $# -gt 0 ] && { [ "$1" ] && _rest=$1; shift; }
+        for i; do [ "$i" = '--' ] && break; eval "_${i%%:*}=\${i#*:}"; done
+    }
+    _flag() { args : "$@"; defvar "$@"; }
+    _param() { args '' "$@"; defvar "$@"; }
+    _option() { args '' "$@"; defvar "$@"; }
+    _disp() { args : "$@"; }
+    _msg() { args : _ "$@"; }
+
+    "$@"
+    _0 "${_rest:?}=''"
+
+    args() {
+        sw='' validate='' pattern='' counter='' on=$_on off=$_off export=$_export
+        while [ $# -gt 1 ] && [ "$2" != '--' ] && shift; do
+            case $1 in
+                --\{no-\}*) sw="$sw${sw:+ | }--${1#--?no-?} | --no-${1#--?no-?}" ;;
+                [-+]? | --*) sw="$sw${sw:+ | }$1" ;;
+                *) eval "${1%%:*}=\"\${1#*:}\""
+            esac
+        done
+    }
+    setup() { :; }
+    _flag() {
+        args "$@"
+        quote on "$on" && quote off "$off"
+        [ "$counter" ] && on=1 off=-1 v="\$((\${$1:-0}+\${OPTARG:-0}))" || v=''
+        _3 "$sw)"
+        _4 '[ "${OPTARG:-}" ] && OPTARG=${OPTARG#*\=} && set -- noarg "$1" && break'
+        _4 "eval '[ \${OPTARG+x} ] &&:' && OPTARG=$on || OPTARG=$off"
+        valid "$1" "${v:-\$OPTARG}"
+        _4 ';;'
+    }
+    _param() {
+        args "$@"
+        _3 "$sw)"
+        _4 '[ $# -le 1 ] && set -- required "$1" && break'
+        _4 'OPTARG=$2'
+        valid "$1" '$OPTARG'
+        _4 'shift ;;'
+    }
+    _option() {
+        args "$@"
+        quote on "$on" && quote off "$off"
+        _3 "$sw)"
+        _4 'set -- "$1" "$@"'
+        _4 '[ ${OPTARG+x} ] && {'
+        _5 'case $1 in --no-*) set -- noarg "${1%%\=*}"; break; esac'
+        _5 '[ "${OPTARG:-}" ] && { shift; OPTARG=$2; } ||' "OPTARG=$on"
+        _4 "} || OPTARG=$off"
+        valid "$1" '$OPTARG'
+        _4 'shift ;;'
+    }
+    valid() {
+        set -- "$validate" "$pattern" "$1" "$2"
+        [ "$1" ] && _4 "$1 || { set -- ${1%% *}:\$? \"\$1\" $1; break; }"
+        [ "$2" ] && {
+            quote pattern "$2"
+            _4 "case \$OPTARG in $2) ;;"
+            _5 "*) set -- pattern:$pattern \"\$1\"; break"
+            _4 "esac"
+        }
+        code "$3" _4 "${export:+export }$3=\"$4\"" "${3#:}"
+    }
+    _disp() {
+        args "$@"
+        _3 "$sw)"
+        code "$1" _4 "echo \"\${$1}\"" "${1#:}"
+        _4 'exit 0 ;;'
+    }
+    _msg() { :; }
+
+    _0 "$2() {"
+    _1 'OPTIND=$(($#+1))'
+    _1 'while OPTARG= && [ $# -gt 0 ]; do'
+    [ "$_alt" ] && _2 'case $1 in -[!-]?*) set -- "-$@"; esac'
+    _2 'case $1 in'
+    wa() { _4 "eval '${1% *}' \${1+'\"\$@\"'}"; }
+    _3 '--?*=*) OPTARG=$1; shift'
+    wa 'set -- "${OPTARG%%\=*}" "${OPTARG#*\=}" "$@"'
+    _4 ';;'
+    _3 '--no-*) unset OPTARG ;;'
+    [ "$_alt" ] || {
+        [ "$_opts" ] && {
+            _3 "-[$_opts]?*) OPTARG=\$1; shift"
+            wa 'set -- "${OPTARG%"${OPTARG#??}"}" "${OPTARG#??}" "$@"'
+            _4 ';;'
+        }
+        _3 '-[!-]?*) OPTARG=$1; shift'
+        wa 'set -- "${OPTARG%"${OPTARG#??}"}" "-${OPTARG#??}" "$@"'
+        _4 'OPTARG= ;;'
+    }
+    [ "$_plus" ] && {
+        _3 '+??*) OPTARG=$1; shift'
+        wa 'set -- "${OPTARG%"${OPTARG#??}"}" "+${OPTARG#??}" "$@"'
+        _4 'unset OPTARG ;;'
+        _3 '+*) unset OPTARG ;;'
+    }
+    _2 'esac'
+    _2 'case $1 in'
+    "$@"
+    rest() {
+        _3 "$1"
+        _4 'while [ $# -gt 0 ]; do'
+        _5 "$_rest=\"\${$_rest}" '\"\${$((${OPTIND:-0}-$#))}\""'
+        _5 'shift'
+        _4 'done'
+        _4 'break ;;'
+    }
+    rest '--) shift'
+    _3 "[-${_plus:++}]?*)" 'set -- unknown "$1" && break ;;'
+    case $_mode in
+        +) rest '*)' ;;
+        *) _3 "*) $_rest=\"\${$_rest}" '\"\${$((${OPTIND:-0}-$#))}\""'
+    esac
+    _2 'esac'
+    _2 'shift'
+    _1 'done'
+    _1 '[ $# -eq 0 ] && { OPTIND=1; unset OPTARG; return 0; }'
+    _1 'case $1 in'
+    _2 'unknown) set -- "Unrecognized option: $2" "$@" ;;'
+    _2 'noarg) set -- "Does not allow an argument: $2" "$@" ;;'
+    _2 'required) set -- "Requires an argument: $2" "$@" ;;'
+    _2 'pattern:*) set -- "Does not match the pattern (${1#*:}): $2" "$@" ;;'
+    _2 '*) set -- "Validation error ($1): $2" "$@"'
+    _1 'esac'
+    [ "$_error" ] && _1 "$_error" '"$@" >&2 || exit $?'
+    _1 'echo "$1" >&2'
+    _1 'exit 1'
+    _0 '}'
+
+    # This throws an error on older versions of shellcheck.
+    # shellcheck disable=2086
+    [ ! "$_help" ] || eval "shift 2; getoptions_help $1 $_help" ${3+'"$@"'}
+}
+# URL: https://github.com/ko1nksm/getoptions (v2.0.1)
+# License: Creative Commons Zero v1.0 Universal
+getoptions_help() {
+    width=30 plus='' leading='  '
+
+    pad() { p=$2; while [ ${#p} -lt "$3" ]; do p="$p "; done; eval "$1=\$p"; }
+
+    args() {
+        _type=$1 var=${2%% *} sw='' label='' hidden='' _width=$width && shift 2
+        while [ $# -gt 0 ] && i=$1 && shift && [ ! "$i" = '--' ]; do
+            case $i in
+                --*) pad sw "$sw${sw:+, }" $((${plus:+4}+4)); sw="$sw$i" ;;
+                -?) sw="$sw${sw:+, }$i" ;;
+                +?) [ ! "$plus" ] || { pad sw "$sw${sw:+, }" 4; sw="$sw$i"; } ;;
+                *) eval "${i%%:*}=\${i#*:}"
+            esac
+        done
+        [ "$hidden" ] && return 0
+
+        [ "$label" ] || case $_type in
+            setup | msg) label='' _width=0 ;;
+            flag | disp) label="$sw " ;;
+            param) label="$sw $var " ;;
+            option) label="${sw}[=$var] "
+        esac
+        pad label "${label:+$leading}$label" "$_width"
+        [ ${#label} -le "$_width" ] && [ $# -gt 0 ] && label="$label$1" && shift
+        echo "$label"
+        pad label '' "$_width"
+        for i; do echo "$label$i"; done
+    }
+
+    for i in 'setup :' flag param option disp 'msg :'; do
+        eval "${i% *}() { args $i \"\$@\"; }"
+    done
+
+    echo "$2() {"
+    echo "cat<<'GETOPTIONSHERE'"
+    "$@"
+    echo "GETOPTIONSHERE"
+    echo "}"
+}
+
+global_options() {
+    msg -- '' 'Global Options:'
+    flag  CPT_FORCE  -f --force                init:@export -- "Force operation"
+    flag  CPT_PROMPT -y --no-prompt on:0 off:0 init:@export -- "Do not prompt for confirmation"
+    param CPT_ROOT      --root                 init:@export -- "Use an alternate root directory"
+    disp :usage      -h --help                              -- "Show this help message"
+    disp :version    -v --version                           -- "Print version information"
+}
+
+# Local Variables:
+# mode: sh
+# End:
diff --git a/lib/cpt-helpers b/lib/cpt-helpers
new file mode 100644
index 0000000..1589979
--- /dev/null
+++ b/lib/cpt-helpers
@@ -0,0 +1,77 @@
+# Helper functions to ensure portability and/or provide choices
+
+_seq() (
+    # Pure shell counter meant to be used in 'for' loops.
+    i=0 buf=''
+    while [ "$(( i += 1 ))" -le "$1" ]; do
+        buf="$buf $i "
+    done
+    printf '%s' "$buf"
+)
+
+_stat() (
+    _user=; eval set -- "$(ls -ld "$1")"
+    id -u "${_user:=$3}" >/dev/null 2>&1 || _user=root
+    printf '%s' "$_user"
+)
+
+sh256() {
+    # This is a sha256sum function for outputting a standard
+    # hash digest. sha256 on BSD systems require an '-r' flag
+    # for outputting the same way with sha256sum, and still,
+    # it outputs a single space between the hash and the file
+    # whereas sha256sum outputs double spaces. It fallbacks to
+    # openssl, but that is rarely ever needed.
+    { sha256sum "$1" 2>/dev/null   ||
+      sha256 -r "$1" 2>/dev/null   ||
+      openssl dgst -r -sha256 "$1" ||
+      die "No sha256 program could be run." ;} |
+
+        while read -r hash _; do printf '%s  %s\n' "$hash" "$1"; done
+}
+
+decompress() {
+    case $1 in
+        *.tar)      cat       ;;
+        *.bz2)      bzip2 -cd ;;
+        *.xz|*.txz) xz -dcT 0 ;;
+        *.tgz|*.gz) gzip -cd  ;;
+        *.zst)      zstd -cd  ;;
+    esac < "$1"
+}
+
+as_root() {
+    # Simple function to run a command as root using either 'sudo',
+    # 'doas' or 'su'. Hurrah for choice.
+    [ "$uid" = 0 ] || log "Using '${su:-su}' (to become ${user:=root})"
+
+    # We are exporting package manager variables, so that we still have the
+    # same repository paths / access to the same cache directories etc.
+    set -- HOME="$HOME" \
+           USER="$user" \
+           XDG_CACHE_HOME="$XDG_CACHE_HOME" \
+           CPT_CACHE="$CPT_CACHE" \
+           CPT_CHOICE="$CPT_CHOICE" \
+           CPT_COMPRESS="$CPT_COMPRESS" \
+           CPT_DEBUG="$CPT_DEBUG" \
+           CPT_FETCH="$CPT_FETCH" \
+           CPT_FORCE="$CPT_FORCE" \
+           CPT_HOOK="$CPT_HOOK" \
+           CPT_KEEPLOG="$CPT_KEEPLOG" \
+           CPT_PATH="$CPT_PATH" \
+           CPT_PID="$CPT_PID" \
+           CPT_PROMPT="$CPT_PROMPT" \
+           CPT_ROOT="$CPT_ROOT" \
+           CPT_TMPDIR="$CPT_TMPDIR" \
+           "$@"
+
+    case ${su##*/} in
+        sls|sudo|doas) "$su" -u "$user" -- env "$@" ;;
+        su)   su -c "env $* <&3" "$user" 3<&0 </dev/tty ;;
+        *)    die "Invalid CPT_SU value: $su" ;;
+    esac
+}
+
+# Local Variables:
+# mode: sh
+# End:
diff --git a/lib/cpt-pkg b/lib/cpt-pkg
new file mode 100644
index 0000000..bfaa428
--- /dev/null
+++ b/lib/cpt-pkg
@@ -0,0 +1,879 @@
+# Package functions
+# shellcheck source=lib-cpt
+
+run_hook() {
+    # Store the CPT_HOOK variable so that we can revert it if it is changed.
+    oldCPT_HOOK=$CPT_HOOK
+
+    # If a fourth parameter 'root' is specified, source the hook from a
+    # predefined location to avoid privilige escalation through user scripts.
+    [ "$4" ] && CPT_HOOK=$CPT_ROOT/etc/cpt-hook
+
+    [ -f "$CPT_HOOK" ] || { CPT_HOOK=$oldCPT_HOOK; return 0 ;}
+
+    [ "$2" ] && log "$2" "Running $1 hook"
+
+    TYPE=${1:-null} PKG=${2:-null} DEST=${3:-null} . "$CPT_HOOK"
+    CPT_HOOK=$oldCPT_HOOK
+}
+
+pkg_lint() {
+    # Check that each mandatory file in the package entry exists.
+    log "$1" "Checking repository files"
+
+    repo_dir=$(pkg_find "$1")
+
+    cd "$repo_dir" || die "'$repo_dir' not accessible"
+    [ -f sources ] || warn "$1" "Sources file not found"
+    [ -x build ]   || die "$1" "Build file not found or not executable"
+    [ -s version ] || die "$1" "Version file not found or empty"
+
+    read -r _ release 2>/dev/null < version || die "Version file not found"
+    [ "$release" ] || die "Release field not found in version file"
+
+    [ "$2" ] || [ -f checksums ] || die "$pkg" "Checksums are missing"
+}
+
+pkg_cache() {
+    read -r version release 2>/dev/null < "$(pkg_find "$1")/version"
+
+    # Initially assume that the package tarball is built with the CPT_COMPRESS
+    # value.
+    if [ -f "$bin_dir/$1#$version-$release.tar.$CPT_COMPRESS" ]; then
+        tar_file="$bin_dir/$1#$version-$release.tar.$CPT_COMPRESS"
+    else
+        set +f; set -f -- "$bin_dir/$1#$version-$release.tar."*
+        tar_file=$1
+    fi
+
+    [ -f "$tar_file" ]
+}
+
+pkg_strip() {
+    # Strip package binaries and libraries. This saves space on the
+    # system as well as on the tarballs we ship for installation.
+
+    # Package has stripping disabled, stop here.
+    [ -f "$mak_dir/$pkg/nostrip" ] && return
+
+    log "$1" "Stripping binaries and libraries"
+
+    find "$pkg_dir/$1" -type f | while read -r file; do
+        case $(od -A o -t c -N 18 "$file") in
+            # REL (object files (.o), static libraries (.a)).
+            *177*E*L*F*0000020\ 001\ *|*\!*\<*a*r*c*h*\>*)
+                strip -g -R .comment -R .note "$file"
+            ;;
+
+            # EXEC (static binaries).
+            # DYN (shared libraries, dynamic binaries).
+            # Shared libraries keep global symbols in a separate ELF section
+            # called '.dynsym'. '--strip-all/-s' does not touch the dynamic
+            # symbol entries which makes this safe to do.
+            *177*E*L*F*0000020\ 00[23]\ *)
+                strip -s -R .comment -R .note "$file"
+            ;;
+        esac
+    done 2>/dev/null ||:
+}
+
+pkg_manifest() (
+    # Generate the package's manifest file. This is a list of each file
+    # and directory inside the package. The file is used when uninstalling
+    # packages, checking for package conflicts and for general debugging.
+    log "$1" "Generating manifest"
+
+    # This function runs as a sub-shell to avoid having to 'cd' back to the
+    # prior directory before being able to continue.
+    cd "${2:-$pkg_dir}/$1"
+
+    # find: Print all files and directories and append '/' to directories.
+    # sort: Sort the output in *reverse*. Directories appear *after* their
+    #       contents.
+    # sed:  Remove the first character in each line (./dir -> /dir) and
+    #       remove all lines which only contain '.'.
+    find . -type d -exec printf '%s/\n' {} + -o -print |
+        sort -r | sed '/^\.\/$/d;ss.ss' > "${2:-$pkg_dir}/$1/$pkg_db/$1/manifest"
+)
+
+pkg_etcsums() (
+    # This function runs as a sub-shell to avoid having to 'cd' back to the
+    # prior directory before being able to continue.
+    cd "$pkg_dir/$1/etc" 2>/dev/null || return 0; cd ..
+
+    # Generate checksums for each configuration file in the package's
+    # /etc/ directory for use in "smart" handling of these files.
+    log "$1" "Generating etcsums"
+
+
+    find etc -type f | while read -r file; do
+        sh256 "$file"
+    done > "$pkg_dir/$1/$pkg_db/$1/etcsums"
+)
+
+pkg_tar() {
+    # Create a tarball from the built package's files.
+    # This tarball also contains the package's database entry.
+    log "$1" "Creating tarball"
+
+    # Read the version information to name the package.
+    read -r version release < "$(pkg_find "$1")/version"
+
+    # Create a tarball from the contents of the built package.
+    "$tar" cf - -C "$pkg_dir/$1" . |
+        case $CPT_COMPRESS in
+            bz2) bzip2 -z ;;
+            xz)  xz -zT 0 ;;
+            gz)  gzip -6  ;;
+            zst) zstd -3  ;;
+            *)   gzip -6  ;;  # Fallback to gzip
+        esac \
+    > "$bin_dir/$1#$version-$release.tar.$CPT_COMPRESS"
+
+    log "$1" "Successfully created tarball"
+
+    run_hook post-package "$1" "$bin_dir/$1#$version-$release.tar.$CPT_COMPRESS"
+}
+
+pkg_build() {
+    # Build packages and turn them into packaged tarballs. This function
+    # also checks checksums, downloads sources and ensure all dependencies
+    # are installed.
+    pkg_build=1
+
+    log "Resolving dependencies"
+
+    for pkg do contains "$explicit" "$pkg" || {
+        pkg_depends "$pkg" explicit
+
+        # Mark packages passed on the command-line
+        # separately from those detected as dependencies.
+        explicit="$explicit $pkg "
+    } done
+
+    [ "$pkg_update" ] || explicit_build=$explicit
+
+    # If an explicit package is a dependency of another explicit
+    # package, remove it from the explicit list as it needs to be
+    # installed as a dependency.
+    # shellcheck disable=2086,2031
+    for pkg do
+        contains "$deps" "$pkg" && explicit=$(pop "$pkg" from $explicit)
+    done
+
+    # See [1] at top of script.
+    # shellcheck disable=2046,2086,2031
+    set -- $deps $explicit
+
+    log "Building: $*"
+
+    # Only ask for confirmation if more than one package needs to be built.
+    [ $# -gt 1 ] || [ "$pkg_update" ] && { prompt || exit 0 ;}
+
+    log "Checking for pre-built dependencies"
+
+    for pkg do pkg_lint "$pkg"; done
+
+    # Install any pre-built dependencies if they exist in the binary
+    # directory and are up to date.
+    for pkg do ! contains "$explicit_build" "$pkg" && pkg_cache "$pkg" && {
+        log "$pkg" "Found pre-built binary, installing"
+        (CPT_FORCE=1 cpt-install "$tar_file")
+
+        # Remove the now installed package from the build list.
+        # See [1] at top of script.
+        # shellcheck disable=2046,2086
+        set -- $(pop "$pkg" from "$@")
+    } done
+
+    for pkg do pkg_sources "$pkg"; done
+
+    pkg_verify "$@"
+
+    # Finally build and create tarballs for all passed packages and
+    # dependencies.
+    for pkg do
+        log "$pkg" "Building package ($((in = in + 1))/$#)"
+
+        pkg_extract "$pkg"
+        repo_dir=$(pkg_find "$pkg")
+
+        read -r build_version _ < "$repo_dir/version"
+
+        # Copy the build file to the build directory to users to modify it
+        # temporarily at runtime.
+        cp -f "$repo_dir/build" "$mak_dir/$pkg/.build.cpt"
+
+        # Install built packages to a directory under the package name
+        # to avoid collisions with other packages.
+        mkdir -p "$pkg_dir/$pkg/$pkg_db"
+
+        # Move to the build directory.
+        cd "$mak_dir/$pkg"
+
+        log "$pkg" "Starting build"
+
+        run_hook pre-build "$pkg" "$pkg_dir/$pkg"
+
+        # Notify the user if the build script is changed during the pre-build
+        # hook.
+        diff -q "$repo_dir/build" .build.cpt ||
+            log "$pkg" "Executing the modified build file"
+
+        # Call the build script, log the output to the terminal
+        # and to a file. There's no PIPEFAIL in POSIX shelll so
+        # we must resort to tricks like killing the script ourselves.
+        { ./.build.cpt "$pkg_dir/$pkg" "$build_version" "$sys_arch" 2>&1 || {
+            log "$pkg" "Build failed"
+            log "$pkg" "Log stored to $log_dir/$pkg-$time-$pid"
+            run_hook build-fail "$pkg" "$pkg_dir/$pkg"
+            pkg_clean
+            kill 0
+        } } | tee "$log_dir/$pkg-$time-$pid"
+
+        # Run the test script if it exists and the user wants to run tests. This
+        # is turned off by default.
+        [ -x "$repo_dir/test" ] && [ "$CPT_TEST" = 1 ] && {
+            run_hook pre-test "$pkg" "$pkg_dir/$pkg"
+            log "$pkg" "Running tests"
+            "$repo_dir/test" "$pkg_dir/$pkg" "$build_version" "$sys_arch" 2>&1 || {
+                log "$pkg" "Test failed"
+                log "$pkg" "Log stored to $log_dir/$pkg-$time-$pid"
+                run_hook test-fail "$pkg" "$pkg_dir/$pkg"
+                pkg_clean
+                kill 0
+        } } | tee -a "$log_dir/$pkg-$time-$pid"
+
+        # Delete the log file if the build succeeded to prevent
+        # the directory from filling very quickly with useless logs.
+        [ "$CPT_KEEPLOG" = 1 ] || rm -f "$log_dir/$pkg-$time-$pid"
+
+        # Copy the repository files to the package directory.
+        # This acts as the database entry.
+        cp -LRf "$repo_dir" "$pkg_dir/$pkg/$pkg_db/"
+
+        # Copy the modified build file to the package directory.
+        pkg_build="$pkg_dir/$pkg/$pkg_db/$pkg/build"
+        diff -U 3 "$pkg_build" .build.cpt > "$pkg_build.diff" &&
+            rm -f "$pkg_build.diff"
+
+        # We don't want the package manager to track 'dir' pages of the info
+        # directory. We don't want every single package to create their own dir
+        # files either.
+        rm -f "$pkg_dir/$pkg/usr/share/info/dir"
+
+        # We never ever want this. Let's end the endless conflicts
+        # and remove it.
+        find "$pkg_dir/$pkg" -name charset.alias -exec rm -f {} +
+
+        # Remove libtool's '*.la' library files. This removes cross-build
+        # system conflicts that may arise. Build-systems change, libtool
+        # is getting deprecated, we don't want a package that depends on
+        # some package's '.la' files.
+        find "$pkg_dir/$pkg" -name '*.la' -exec rm -f {} +
+
+        log "$pkg" "Successfully built package"
+
+        run_hook post-build "$pkg" "$pkg_dir/$pkg"
+
+        # Create the manifest file early and make it empty.
+        # This ensures that the manifest is added to the manifest.
+        : > "$pkg_dir/$pkg/$pkg_db/$pkg/manifest"
+
+        # If the package contains '/etc', add a file called
+        # 'etcsums' to the manifest. See comment directly above.
+        [ -d "$pkg_dir/$pkg/etc" ] &&
+            : > "$pkg_dir/$pkg/$pkg_db/$pkg/etcsums"
+
+        pkg_strip    "$pkg"
+        pkg_manifest "$pkg"
+        pkg_fix_deps "$pkg"
+        pkg_manifest "$pkg"
+        pkg_etcsums  "$pkg"
+        pkg_tar      "$pkg"
+
+        # Install only dependencies of passed packages.
+        # Skip this check if this is a package update.
+        contains "$explicit" "$pkg" && [ -z "$pkg_update" ] && continue
+
+        log "$pkg" "Needed as a dependency or has an update, installing"
+
+        (CPT_FORCE=1 cpt-install "$pkg")
+    done
+
+    # End here as this was a system update and all packages have been installed.
+    [ "$pkg_update" ] && return
+
+    log "Successfully built package(s)"
+
+    # Turn the explicit packages into a 'list'.
+    # See [1] at top of script.
+    # shellcheck disable=2046,2086
+    set -- $explicit
+
+    # Only ask for confirmation if more than one package needs to be installed.
+    [ $# -gt 1 ] && prompt "Install built packages? [$*]" && {
+        cpt-install "$@"
+        return
+    }
+
+    log "Run 'cpt i $*' to install the package(s)"
+}
+
+pkg_checksums() {
+    # Generate checksums for packages.
+    repo_dir=$(pkg_find "$1")
+
+    [ -f "$repo_dir/sources" ] || return 0
+
+    while read -r src _ || [ "$src" ]; do
+        # Comment.
+        if [ -z "${src##\#*}" ]; then
+            continue
+
+        # File is local to the package.
+        elif [ -f "$repo_dir/$src" ]; then
+            src_path=$repo_dir/${src%/*}
+
+        # File is remote and was downloaded.
+        elif [ -f "$src_dir/$1/${src##*/}" ]; then
+            src_path=$src_dir/$1
+
+        # File is a git repository.
+        elif [ -z "${src##git+*}" ]; then continue
+
+        # Die here if source for some reason, doesn't exist.
+        else
+            die "$1" "Couldn't find source '$src'"
+        fi
+
+        # An easy way to get 'sha256sum' to print with the 'basename'
+        # of files is to 'cd' to the file's directory beforehand.
+        (cd "$src_path" && sh256 "${src##*/}") ||
+            die "$1" "Failed to generate checksums"
+    done < "$repo_dir/sources"
+}
+
+pkg_verify() {
+    # Verify all package checksums. This is achieved by generating a new set of
+    # checksums and then comparing those with the old set.
+    verify_cmd="NR==FNR{a[\$1];next}/^git  .*/{next}!((\$1)in a){exit 1}"
+
+    for pkg; do
+        repo_dir=$(pkg_find "$pkg")
+        [ -f "$repo_dir/sources" ] || continue
+
+        pkg_checksums "$pkg" | awk "$verify_cmd" - "$repo_dir/checksums" || {
+        log "$pkg" "Checksum mismatch"
+
+        # Instead of dying above, log it to the terminal. Also define a
+        # variable so we *can* die after all checksum files have been
+        # checked.
+        mismatch="$mismatch$pkg "
+    } done
+
+    [ -z "$mismatch" ] || die "Checksum mismatch with: ${mismatch% }"
+}
+
+pkg_conflicts() {
+    # Check to see if a package conflicts with another.
+    log "$1" "Checking for package conflicts"
+
+    # Filter the tarball's manifest and select only files
+    # and any files they resolve to on the filesystem
+    # (/bin/ls -> /usr/bin/ls).
+    while read -r file; do
+        case $file in */) continue; esac
+
+        # Use $CPT_ROOT in filename so that we follow its symlinks.
+        file=$CPT_ROOT/${file#/}
+
+        # We will only follow the symlinks of the directories, so we reserve the
+        # directory name in this 'dirname' value. If we cannot find it in the
+        # system, we don't need to make this much more complex by trying so hard
+        # to find it. Simply use the original directory name.
+        dirname="$(_readlinkf "${file%/*}" 2>/dev/null)" ||
+            dirname="${file%/*}"
+
+
+        # Combine the dirname and file values, and print them into the
+        # temporary manifest to be parsed.
+        printf '%s/%s\n' "${dirname#$CPT_ROOT}" "${file##*/}"
+
+    done < "$tar_dir/$1/$pkg_db/$1/manifest" > "$CPT_TMPDIR/$pid/manifest"
+
+    p_name=$1
+
+    # Generate a list of all installed package manifests
+    # and remove the current package from the list.
+    # shellcheck disable=2046,2086
+    set -- $(set +f; pop "$sys_db/$p_name/manifest" from "$sys_db"/*/manifest)
+
+    [ -s "$CPT_TMPDIR/$pid/manifest" ] || return 0
+
+    # In rare cases where the system only has one package installed
+    # and you are reinstalling that package, grep will try to read from
+    # standard input if we continue here.
+    #
+    # Also, if we don't have any packages installed grep will give an
+    # error. This will not cause the installation to fail, but we don't
+    # need to check for conflicts if that's the case anyway. If we have
+    # only zero packages or one package, just stop wasting time and continue
+    # with the installation.
+    [ "$1" ] && [ -f "$1" ] || return 0
+
+    # Store the list of found conflicts in a file as we will be using the
+    # information multiple times. Storing it in the cache dir allows us
+    # to be lazy as they'll be automatically removed on script end.
+    "$grep" -Fxf "$CPT_TMPDIR/$pid/manifest" -- "$@" > "$CPT_TMPDIR/$pid/conflict" ||:
+
+
+    # Enable alternatives automatically if it is safe to do so.
+    # This checks to see that the package that is about to be installed
+    # doesn't overwrite anything it shouldn't in '/var/db/cpt/installed'.
+    "$grep" -q ":/var/db/cpt/installed/" "$CPT_TMPDIR/$pid/conflict" ||
+        choice_auto=1
+
+    # Use 'grep' to list matching lines between the to
+    # be installed package's manifest and the above filtered
+    # list.
+    if [ "$CPT_CHOICE" != 0 ] && [ "$choice_auto" = 1 ]; then
+
+        # This is a novel way of offering an "alternatives" system.
+        # It is entirely dynamic and all "choices" are created and
+        # destroyed on the fly.
+        #
+        # When a conflict is found between two packages, the file
+        # is moved to a directory called "choices" and its name
+        # changed to store its parent package and its intended
+        # location.
+        #
+        # The package's manifest is then updated to reflect this
+        # new location.
+        #
+        # The 'cpt choices' command parses this directory and
+        # offers you the CHOICE of *swapping* entries in this
+        # directory for those on the filesystem.
+        #
+        # The choices command does the same thing we do here,
+        # it rewrites manifests and moves files around to make
+        # this work.
+        #
+        # Pretty nifty huh?
+        while IFS=: read -r _ con; do
+            printf '%s\n' "Found conflict $con"
+
+            # Create the "choices" directory inside of the tarball.
+            # This directory will store the conflicting file.
+            mkdir -p "$tar_dir/$p_name/${cho_dir:=var/db/cpt/choices}"
+
+            # Construct the file name of the "db" entry of the
+            # conflicting file. (pkg_name>usr>bin>ls)
+            con_name=$(printf %s "$con" | sed 's|/|>|g')
+
+            # Move the conflicting file to the choices directory
+            # and name it according to the format above.
+            mv -f "$tar_dir/$p_name/$con" \
+                  "$tar_dir/$p_name/$cho_dir/$p_name$con_name" 2>/dev/null || {
+                log "File must be in ${con%/*} and not a symlink to it"
+                log "This usually occurs when a binary is installed to"
+                log "/sbin instead of /usr/bin (example)"
+                log "Before this package can be used as an alternative,"
+                log "this must be fixed in $p_name. Contact the maintainer"
+                die "by checking 'git log' or by running 'cpt-maintainer'"
+            }
+        done < "$CPT_TMPDIR/$pid/conflict"
+
+        # Rewrite the package's manifest to update its location
+        # to its new spot (and name) in the choices directory.
+        pkg_manifest "$p_name" "$tar_dir" 2>/dev/null
+
+    elif [ -s "$CPT_TMPDIR/$pid/conflict" ]; then
+        log "Package '$p_name' conflicts with another package" "" "!>"
+        log "Run 'CPT_CHOICE=1 cpt i $p_name' to add conflicts" "" "!>"
+        die "as alternatives."
+    fi
+}
+
+pkg_swap() {
+    # Swap between package alternatives.
+    pkg_list "$1" >/dev/null
+
+    alt=$(printf %s "$1$2" | sed 's|/|>|g')
+    cd "$sys_db/../choices"
+
+    [ -f "$alt" ] || [ -h "$alt" ] ||
+        die "Alternative '$1 $2' doesn't exist"
+
+    if [ -f "$2" ]; then
+        # Figure out which package owns the file we are going to swap for
+        # another package's.
+        #
+        # Print the full path to the manifest file which contains
+        # the match to our search.
+
+        pkg_owns=$(pkg_owner -lFx "$2") ||
+            die "File '$2' exists on filesystem but isn't owned"
+
+        log "Swapping '$2' from '$pkg_owns' to '$1'"
+
+        # Convert the current owner to an alternative and rewrite
+        # its manifest file to reflect this. We then resort this file
+        # so no issues arise when removing packages.
+        cp  -Pf "$CPT_ROOT/$2" "$pkg_owns>${alt#*>}"
+        sed "s#^$(regesc "$2")\$#${PWD#$CPT_ROOT}/$pkg_owns>${alt#*>}#" \
+            "../installed/$pkg_owns/manifest" |
+            sort -r -o "../installed/$pkg_owns/manifest"
+    fi
+
+    # Convert the desired alternative to a real file and rewrite
+    # the manifest file to reflect this. The reverse of above.
+    mv -f "$alt" "$CPT_ROOT/$2"
+    sed "s#^${PWD#$CPT_ROOT}/$(regesc "$alt")\$#$2#" "../installed/$1/manifest" |
+        sort -r -o "../installed/$1/manifest"
+}
+
+pkg_etc() {
+    [ -d "$tar_dir/$pkg_name/etc" ] || return 0
+
+    (cd "$tar_dir/$pkg_name"
+
+    # Create all directories beforehand.
+    find etc -type d | while read -r dir; do
+        mkdir -p "$CPT_ROOT/$dir"
+    done
+
+    # Handle files in /etc/ based on a 3-way checksum check.
+    find etc ! -type d | while read -r file; do
+        { sum_new=$(sh256 "$file")
+          sum_sys=$(cd "$CPT_ROOT/"; sh256 "$file")
+          sum_old=$("$grep" "$file$" "$mak_dir/c"); } 2>/dev/null ||:
+
+        log "$pkg_name" "Doing 3-way handshake for $file"
+        printf '%s\n' "Previous: ${sum_old:-null}"
+        printf '%s\n' "System:   ${sum_sys:-null}"
+        printf '%s\n' "New:      ${sum_new:-null}"
+
+        # Use a case statement to easily compare three strings at
+        # the same time. Pretty nifty.
+        case ${sum_old:-null}${sum_sys:-null}${sum_new} in
+            # old = Y, sys = X, new = Y
+            "${sum_new}${sum_sys}${sum_old}")
+                log "Skipping $file"
+                continue
+            ;;
+
+            # old = X, sys = X, new = X
+            # old = X, sys = Y, new = Y
+            # old = X, sys = X, new = Y
+            "${sum_old}${sum_old}${sum_old}"|\
+            "${sum_old:-null}${sum_sys}${sum_sys}"|\
+            "${sum_sys}${sum_old}"*)
+                log "Installing $file"
+                new=
+            ;;
+
+            # All other cases.
+            *)
+                warn "$pkg_name" "saving /$file as /$file.new" "->"
+                new=.new
+            ;;
+        esac
+
+        cp -fPp "$file"  "$CPT_ROOT/${file}${new}"
+        chown root:root "$CPT_ROOT/${file}${new}" 2>/dev/null
+    done) ||:
+}
+
+pkg_remove() {
+    # Remove a package and all of its files. The '/etc' directory
+    # is handled differently and configuration files are *not*
+    # overwritten.
+    pkg_list "$1" >/dev/null || return
+
+    # Make sure that nothing depends on this package.
+    [ "$CPT_FORCE" = 1 ] || {
+        log "$1" "Checking for reverse dependencies"
+
+        (cd "$sys_db"; set +f; grep -lFx "$1" -- */depends) &&
+            die "$1" "Can't remove package, others depend on it"
+    }
+    # Block being able to abort the script with 'Ctrl+C' during removal.
+    # Removes all risk of the user aborting a package removal leaving
+    # an incomplete package installed.
+    trap_set block
+
+    if [ -x "$sys_db/$1/pre-remove" ]; then
+        log "$1" "Running pre-remove script"
+        "$sys_db/$1/pre-remove" ||:
+    fi
+
+    # Create a temporary list of all directories, so we don't accidentally
+    # remove anything from packages that create empty directories for a
+    # purpose (such as baselayout).
+    manifest_list="$(set +f; pop "$sys_db/$1/manifest" from "$sys_db/"*/manifest)"
+    # shellcheck disable=2086
+    [ "$manifest_list" ] && grep -h '/$' $manifest_list | sort -ur > "$mak_dir/dirs"
+
+    run_hook pre-remove "$1" "$sys_db/$1" root
+
+    while read -r file; do
+        # The file is in '/etc' skip it. This prevents the package
+        # manager from removing user edited configuration files.
+        [ "${file##/etc/*}" ] || continue
+
+        if [ -d "$CPT_ROOT/$file" ]; then
+            "$grep" -Fxq "$file" "$mak_dir/dirs" 2>/dev/null && continue
+            rmdir "$CPT_ROOT/$file" 2>/dev/null || continue
+        else
+            rm -f "$CPT_ROOT/$file"
+        fi
+    done < "$sys_db/$1/manifest"
+
+    # Reset 'trap' to its original value. Removal is done so
+    # we no longer need to block 'Ctrl+C'.
+    trap_set cleanup
+
+    run_hook post-remove "$1" "$CPT_ROOT/" root
+
+    log "$1" "Removed successfully"
+}
+
+pkg_install() {
+    # Install a built package tarball.
+
+    # Install can also take the full path to a tarball.
+    # We don't need to check the repository if this is the case.
+    if [ -f "$1" ] && [ -z "${1%%*.tar*}" ] ; then
+        tar_file=$1
+        pkg_name=${1##*/}
+        pkg_name=${pkg_name%#*}
+
+    else
+        pkg_cache "$1" ||
+            die "package has not been built, run 'cpt b pkg'"
+
+        pkg_name=$1
+    fi
+
+    mkdir -p "$tar_dir/$pkg_name"
+    log "$pkg_name" "Extracting $tar_file"
+
+    # Extract the tarball to catch any errors before installation begins.
+    decompress "$tar_file" | "$tar" xf - -C "$tar_dir/$pkg_name"
+
+    [ -f "$tar_dir/$pkg_name/$pkg_db/$pkg_name/manifest" ] ||
+        die "'${tar_file##*/}' is not a valid CPT package"
+
+    # Ensure that the tarball's manifest is correct by checking that
+    # each file and directory inside of it actually exists.
+    [ "$CPT_FORCE" != 1 ] && log "$pkg_name" "Checking package manifest" &&
+        while read -r line; do
+            # Skip symbolic links
+            [ -h "$tar_dir/$pkg_name/$line" ] ||
+            [ -e "$tar_dir/$pkg_name/$line" ] || {
+        log "File $line missing from tarball but mentioned in manifest" "" "!>"
+        TARBALL_FAIL=1
+        }
+    done < "$tar_dir/$pkg_name/$pkg_db/$pkg_name/manifest"
+    [ "$TARBALL_FAIL" ] && {
+        log "You can still install this package by setting CPT_FORCE variable"
+        die "$pkg_name" "Missing files in manifest"
+    }
+
+    log "$pkg_name" "Checking that all dependencies are installed"
+
+    # Make sure that all run-time dependencies are installed prior to
+    # installing the package.
+    [ -f "$tar_dir/$pkg_name/$pkg_db/$pkg_name/depends" ] &&
+    [ "$CPT_FORCE" != 1 ] &&
+        while read -r dep dep_type || [ "$dep" ]; do
+            [ "${dep##\#*}" ] || continue
+            [ "$dep_type" ]   || pkg_list "$dep" >/dev/null ||
+                install_dep="$install_dep'$dep', "
+        done < "$tar_dir/$pkg_name/$pkg_db/$pkg_name/depends"
+
+    [ "$install_dep" ] && die "$1" "Package requires ${install_dep%, }"
+
+    run_hook pre-install "$pkg_name" "$tar_dir/$pkg_name" root
+
+    pkg_conflicts "$pkg_name"
+
+    log "$pkg_name" "Installing package incrementally"
+
+    # Block being able to abort the script with Ctrl+C during installation.
+    # Removes all risk of the user aborting a package installation leaving
+    # an incomplete package installed.
+    trap_set block
+
+    # If the package is already installed (and this is an upgrade) make a
+    # backup of the manifest and etcsums files.
+    cp -f "$sys_db/$pkg_name/manifest" "$mak_dir/m" 2>/dev/null ||:
+    cp -f "$sys_db/$pkg_name/etcsums"  "$mak_dir/c" 2>/dev/null ||:
+
+    # This is repeated multiple times. Better to make it a function.
+    pkg_rsync() {
+        rsync "--chown=$USER:$USER" --chmod=Du-s,Dg-s,Do-s \
+              -WhHKa --no-compress --exclude /etc "${1:---}" \
+              "$tar_dir/$pkg_name/" "$CPT_ROOT/"
+    }
+
+    # Install the package by using 'rsync' and overwrite any existing files
+    # (excluding '/etc/').
+    pkg_rsync --info=progress2
+    pkg_etc
+
+    # Remove any leftover files if this is an upgrade.
+    "$grep" -vFxf "$sys_db/$pkg_name/manifest" "$mak_dir/m" 2>/dev/null |
+
+    while read -r file; do
+        file=$CPT_ROOT/$file
+
+        # Skip deleting some leftover files.
+        case $file in /etc/*) continue; esac
+
+        # Remove files.
+        if [ -f "$file" ] && [ ! -L "$file" ]; then
+            rm -f "$file"
+
+        # Remove file symlinks.
+        elif [ -h "$file" ] && [ ! -d "$file" ]; then
+            unlink "$file" ||:
+
+        # Skip directory symlinks.
+        elif [ -h "$file" ] && [ -d "$file" ]; then :
+
+        # Remove directories if empty.
+        elif [ -d "$file" ]; then
+            rmdir "$file" 2>/dev/null ||:
+        fi
+    done ||:
+
+    log "$pkg_name" "Verifying installation"
+    { pkg_rsync; pkg_rsync; } ||:
+
+    # Reset 'trap' to its original value. Installation is done so
+    # we no longer need to block 'Ctrl+C'.
+    trap_set cleanup
+
+    if [ -x "$sys_db/$pkg_name/post-install" ]; then
+        log "$pkg_name" "Running post-install script"
+        "$sys_db/$pkg_name/post-install" ||:
+    fi
+
+    run_hook post-install "$pkg_name" "$sys_db/$pkg_name" root
+
+    log "$pkg_name" "Installed successfully"
+}
+
+pkg_updates(){
+    # Check all installed packages for updates. So long as the installed
+    # version and the version in the repositories differ, it's considered
+    # an update.
+    [ "$CPT_FETCH" = 0 ] || pkg_fetch
+
+    log "Checking for new package versions"
+
+    set +f
+
+    for pkg in "$sys_db/"*; do
+        pkg_name=${pkg##*/}
+
+        # Read version and release information from the installed packages
+        # and repository.
+        read -r db_ver db_rel < "$pkg/version"
+        read -r re_ver re_rel < "$(pkg_find "$pkg_name")/version"
+
+        # Compare installed packages to repository packages.
+        [ "$db_ver-$db_rel" != "$re_ver-$re_rel" ] && {
+            printf '%s\n' "$pkg_name $db_ver-$db_rel ==> $re_ver-$re_rel"
+            outdated="$outdated$pkg_name "
+        }
+    done
+
+    set -f
+
+    # If the download option is specified only download the outdated packages
+    # and exit.
+    # shellcheck disable=2154
+    [ "$download_only" = 1 ] && {
+        log "Only sources for the packages will be acquired"
+        prompt || exit 0
+
+        for pkg in $outdated; do
+            pkg_sources "$pkg"
+        done
+
+        exit 0
+    }
+
+    contains "$outdated" cpt && {
+        log "Detected package manager update"
+        log "The package manager will be updated first"
+
+        prompt || exit 0
+
+        pkg_build cpt
+        cpt-install cpt
+
+        log "Updated the package manager"
+        log "Re-run 'cpt update' to update your system"
+
+        exit 0
+    }
+
+    [ "$outdated" ] || {
+        log "Everything is up to date"
+        return
+    }
+
+    log "Packages to update: ${outdated% }"
+
+    # Tell 'pkg_build' to always prompt before build.
+    pkg_update=1
+
+    # Build all packages requiring an update.
+    # See [1] at top of script.
+    # shellcheck disable=2046,2086
+    {
+        pkg_order $outdated
+        pkg_build $order
+    }
+
+    log "Updated all packages"
+}
+
+pkg_clean() {
+    # Clean up on exit or error. This removes everything related
+    # to the build.
+    [ "$CPT_DEBUG" != 1 ] || return 0
+
+    # Block 'Ctrl+C' while cache is being cleaned.
+    trap_set block
+
+    # Remove temporary items.
+    rm -rf -- "${CPT_TMPDIR:=$cac_dir/proc}/$pid"
+}
+
+create_cache() {
+    # A temporary directory can be specified apart from the cache
+    # directory in order to build in a user specified directory.
+    # /tmp could be used in order to build on ram, useful on SSDs.
+    # The user can specify CPT_TMPDIR for this.
+    #
+    # Create the required temporary directories and set the variables
+    # which point to them.
+    mkdir -p "${tmp_dir:=${CPT_TMPDIR:=$cac_dir/proc}/$pid}"
+
+    # If an argument is given, skip the creation of other cache directories.
+    # This here makes shellcheck extremely angry, so I am globally disabling
+    # SC2119.
+    [ "$1" ] || mkdir -p "${mak_dir:=$tmp_dir/build}" \
+                         "${pkg_dir:=$tmp_dir/pkg}" \
+                         "${tar_dir:=$tmp_dir/export}"
+
+}
+
+# Local Variables:
+# mode: sh
+# End:
diff --git a/lib/cpt-query b/lib/cpt-query
new file mode 100644
index 0000000..1194bdb
--- /dev/null
+++ b/lib/cpt-query
@@ -0,0 +1,88 @@
+# -*- mode: sh -*-
+# Query functions
+
+pkg_find() {
+    # Use a SEARCH_PATH variable so that we can get the sys_db into
+    # the same variable as CPT_PATH. This makes it easier when we are
+    # searching for executables instead of CPT_PATH.
+    : "${SEARCH_PATH:=$CPT_PATH:$sys_db}"
+
+    # Figure out which repository a package belongs to by
+    # searching for directories matching the package name
+    # in $CPT_PATH/*.
+    query=$1 match=$2 type=$3 IFS=:; set --
+
+    # Word splitting is intentional here.
+    # shellcheck disable=2086
+    for path in $SEARCH_PATH ; do
+        set +f
+
+        for path2 in "$path/"$query; do
+            test "${type:--d}" "$path2" && set -f -- "$@" "$path2"
+        done
+    done
+
+    IFS=$old_ifs
+
+    # A package may also not be found due to a repository not being
+    # readable by the current user. Either way, we need to die here.
+    [ "$1" ] || die "Package '$query' not in any repository"
+
+    # Show all search results if called from 'cpt search', else
+    # print only the first match.
+    [ "$match" ] && printf '%s\n' "$@" || printf '%s\n' "$1"
+}
+
+pkg_list() {
+    # List installed packages. As the format is files and
+    # directories, this just involves a simple for loop and
+    # file read.
+
+    # Change directories to the database. This allows us to
+    # avoid having to 'basename' each path. If this fails,
+    # set '$1' to mimic a failed glob which indicates that
+    # nothing is installed.
+    cd "$sys_db" 2>/dev/null || set -- "$sys_db/"\*
+
+    # Optional arguments can be passed to check for specific
+    # packages. If no arguments are passed, list all. As we
+    # loop over '$@', if there aren't any arguments we can
+    # just set the directory contents to the argument list.
+    [ "$1" ] || { set +f; set -f -- *; }
+
+    # If the 'glob' above failed, exit early as there are no
+    # packages installed.
+    [ "$1" = "$sys_db/"\* ] && return 1
+
+    # Loop over each package and print its name and version.
+    for pkg do
+        [ -d "$pkg" ] || { log "$pkg" "not installed"; return 1; }
+
+        read -r version 2>/dev/null < "$pkg/version" || version=null
+        printf '%s\n' "$pkg $version"
+    done
+}
+
+pkg_isbuilt() (
+    # Check if a package is built or not.
+    read -r ver rel < "$(pkg_find "$1")/version"
+
+    set +f
+    for tarball in "$bin_dir/$1#$ver-$rel.tar."*; do
+        [ -f "$tarball" ] && return 0
+    done
+    return 1
+)
+
+pkg_owner() {
+    set +f
+
+    [ "$3" ] || set -- "$1" "$2" "$sys_db"/*/manifest
+
+    pkg_owner=$(grep "$@")
+    pkg_owner=${pkg_owner%/*}
+    pkg_owner=${pkg_owner##*/}
+
+    set -f -- "$pkg_owner"; unset pkg_owner
+    [ "$1" ] && printf '%s\n' "$1"
+}
diff --git a/lib/cpt-source b/lib/cpt-source
new file mode 100644
index 0000000..add5a14
--- /dev/null
+++ b/lib/cpt-source
@@ -0,0 +1,320 @@
+# Functions related to obtaining sources
+
+pkg_sources() {
+    # Download any remote package sources. The existence of local
+    # files is also checked.
+    repo_dir=$(pkg_find "$1")
+
+    # Support packages without sources. Simply do nothing.
+    [ -f "$repo_dir/sources" ] || return 0
+
+    log "$1" "Downloading sources"
+
+    # Store each downloaded source in a directory named after the
+    # package it belongs to. This avoid conflicts between two packages
+    # having a source of the same name.
+    mkdir -p "$src_dir/$1" && cd "$src_dir/$1"
+
+    repo_dir=$(pkg_find "$1")
+
+    while read -r src dest || [ "$src" ]; do
+        # Remote git/hg repository or comment.
+        if [ -z "${src##\#*}" ]   ||
+           [ -z "${src##git+*}" ] ||
+           [ -z "${src##hg+*}" ]
+
+        then :
+
+        # Remote source (cached).
+        elif [ -f "${src##*/}" ]; then
+            log "$1" "Found cached source '${src##*/}'"
+
+        # Remote source.
+        elif [ -z "${src##*://*}" ]; then
+            log "$1" "Downloading $src"
+
+            curl "$src" -fLo "${src##*/}" || {
+                rm -f "${src##*/}"
+                die "$1" "Failed to download $src"
+            }
+
+        # Local source.
+        elif [ -f "$repo_dir/$src" ]; then
+            log "$1" "Found local file '$src'"
+
+        else
+            die "$1" "No local file '$src'"
+        fi
+    done < "$repo_dir/sources"
+}
+
+pkg_extract() {
+    # Extract all source archives to the build directory and copy over
+    # any local repository files.
+    repo_dir=$(pkg_find "$1")
+
+    # Support packages without sources. Simply do nothing.
+    [ -f "$repo_dir/sources" ] || return 0
+
+    log "$1" "Extracting sources"
+
+    while read -r src dest || [ "$src" ]; do
+        mkdir -p "$mak_dir/$1/$dest" && cd "$mak_dir/$1/$dest"
+
+        case $src in
+            # Git repository.
+            git+*)
+                # Split the source into URL + OBJECT (branch or commit).
+                url=${src##git+} com=${url##*[@#]} com=${com#${url%[@#]*}}
+
+                log "$1" "Cloning ${url%[@#]*}"; {
+                    git init
+                    git remote add origin "${url%[@#]*}"
+                    case "$url" in
+                        # Tags are specified via '@'
+                        *@*) git fetch -t --depth=1 origin "$com" || git fetch ;;
+                        *)   git fetch --depth=1 origin "$com" || git fetch
+                    esac
+                    git checkout "${com:-FETCH_HEAD}"
+                } || die "$1" "Failed to clone $src"
+            ;;
+
+            # Mercurial repository.
+            hg+*)
+                # Split the source into URL + OBJECT (branch or commit).
+                url=${src##hg+} com=${url##*[@#]} com=${com#${url%[@#]*}}
+
+                # Unfortunately, there is no shallow cloning with Mercurial.
+                log "$1" "Cloning ${url%[@#]*}"
+                hg clone -u "${com:-tip}"
+
+            ;;
+
+            # Comment or blank line.
+            \#*|'') continue ;;
+
+            # Only 'tar', 'cpio', and 'zip' archives are currently supported for
+            # extraction. Other filetypes are simply copied to '$mak_dir'
+            # which allows for manual extraction.
+            *://*.tar|*://*.tar.??|*://*.tar.???|*://*.tar.????|*://*.tgz|*://*.txz)
+
+                decompress "$src_dir/$1/${src##*/}" > .ktar
+
+                "$tar" xf .ktar || die "$1" "Couldn't extract ${src##*/}"
+
+                # We now list the contents of the tarball so we can do our
+                # version of 'strip-components'.
+                "$tar" tf .ktar |
+                    while read -r file; do printf '%s\n' "${file%%/*}"; done |
+
+                    # Do not repeat files.
+                    uniq |
+
+                    # For every directory in the base we move each file
+                    # inside it to the upper directory.
+                    while read -r dir ; do
+
+                        # Skip if we are not dealing with a directory here.
+                        # This way we don't remove files on the upper directory
+                        # if a tar archive doesn't need directory stripping.
+                        [ -d "${dir#.}" ] || continue
+
+                        # Change into the directory in a subshell so we don't
+                        # need to cd back to the upper directory.
+                        (
+                            cd "$dir"
+
+                            # We use find because we want to move hidden files
+                            # as well.
+                            #
+                            # Skip the file if it has the same name as the directory.
+                            # We will deal with it later.
+                            #
+                            # Word splitting is intentional here.
+                            # shellcheck disable=2046
+                            find . \( ! -name . -prune \) ! -name "$dir" \
+                                 -exec mv -f {} .. \;
+
+                            # If a file/directory with the same name as the directory
+                            # exists, append a '.cptbak' to it and move it to the
+                            # upper directory.
+                            ! [ -e "$dir" ] || mv "$dir" "../${dir}.cptbak"
+                        )
+                        rmdir "$dir"
+
+                        # If a backup file exists, move it into the original location.
+                        ! [ -e "${dir}.cptbak" ] || mv "${dir}.cptbak" "$dir"
+                done
+
+                # Clean up the temporary tarball.
+                rm -f .ktar
+            ;;
+
+            *://*.cpio|*://*.cpio.??|*://*.cpio.???|*://*.cpio.????)
+                decompress "$src_dir/$1/${src##*/}" | cpio -i
+
+            ;;
+
+            *://*.zip)
+                unzip "$src_dir/$1/${src##*/}" ||
+                    die "$1" "Couldn't extract ${src##*/}"
+
+            ;;
+
+            *)
+                # Local file.
+                if [ -f "$repo_dir/$src" ]; then
+                    cp -f "$repo_dir/$src" .
+
+                # Remote file.
+                elif [ -f "$src_dir/$1/${src##*/}" ]; then
+                    cp -f "$src_dir/$1/${src##*/}" .
+
+                else
+                    die "$1" "Local file $src not found"
+                fi
+            ;;
+        esac
+    done < "$repo_dir/sources"
+}
+
+pkg_fetch() {
+    log "Updating repositories"
+
+    run_hook pre-fetch
+
+    # Create a list of all repositories.
+    # See [1] at top of script.
+    # shellcheck disable=2046,2086
+    { IFS=:; set -- $CPT_PATH; IFS=$old_ifs ;}
+
+    # Update each repository in '$CPT_PATH'. It is assumed that
+    # each repository is 'git' tracked.
+    for repo; do
+        # Go to the root of the repository (if it exists).
+        cd "$repo"
+        cd "$(git rev-parse --show-toplevel 2>/dev/null)" 2>/dev/null ||
+            cd "$(hg root 2>/dev/null)" 2>/dev/null ||:
+
+        if [ -d .git ]; then
+
+            [ "$(git remote 2>/dev/null)" ] || {
+                log "$repo" " "
+                printf '%s\n' "No remote, skipping."
+                continue
+            }
+
+            contains "$repos" "$PWD" || {
+                repos="$repos $PWD "
+
+                # Display a tick if signing is enabled for this
+                # repository.
+                case $(git config merge.verifySignatures) in
+                    true) log "$PWD" "[signed] " ;;
+                    *)    log "$PWD" " " ;;
+                esac
+
+                if [ -w "$PWD" ] && [ "$uid" != 0 ]; then
+                    git fetch
+                    git merge
+                    git submodule update --remote --init -f
+
+                else
+                    [ "$uid" = 0 ] || log "$PWD" "Need root to update"
+
+                    # Find out the owner of the repository and spawn
+                    # git as this user below.
+                    #
+                    # This prevents 'git' from changing the original
+                    # ownership of files and directories in the rare
+                    # case that the repository is owned by a 3rd user.
+                    (
+                        user=$(_stat "$PWD")
+
+                        [ "$user" = root ] ||
+                            log "Dropping permissions to $user for pull"
+
+                        git_cmd="git fetch && git merge && git submodule update --remote --init -f"
+                        case $su in *su) git_cmd="'$git_cmd'"; esac
+
+                        # Spawn a subshell to run multiple commands as
+                        # root at once. This makes things easier on users
+                        # who aren't using persist/timestamps for auth
+                        # caching.
+                        user=$user as_root sh -c "$git_cmd"
+                    )
+                fi
+            }
+        elif [ -d .hg ]; then
+
+            [ "$(hg showconfig paths 2>/dev/null)" ] || {
+                log "$repo" " "
+                printf '%s\n' "No remote, skipping."
+                continue
+            }
+
+            contains "$repos $PWD" || {
+                repos="$repos $PWD"
+
+                if [ -w "$PWD" ] && [ "$uid" != 0 ]; then
+                    hg pull
+                    hg update
+                else
+                    [ "$uid" ] || log "$PWD" "Need root to update"
+
+                    # We are going to do the same operation as above, to
+                    # find the owner of the repository.
+                    (
+                        user=$(_stat "$PWD")
+
+                        [ "$user" = root ] ||
+                            log "Dropping permissions to $user for pull"
+
+                        hg_cmd="hg pull && hg update"
+
+                        case $su in *su) hg_cmd="'$hg_cmd'"; esac
+                        user=$user as_root sh -c "$hg_cmd"
+                    )
+                fi
+            }
+        elif [ -f .rsync ]; then
+            # If an .rsync_root file exists, we check that the repository root
+            # exists. If it does, we change to that directory to do the fetch.
+            # This way, we allow for partial repositories while making sure that
+            # we can fetch the repository in a single operation.
+            [ -f .rsync_root ] && {
+                read -r rsync_root < .rsync_root
+                [ -f "$rsync_root/.rsync" ] && cd "$rsync_root"
+            }
+            contains "$repos" "$PWD" || {
+                repos="$repos $PWD"
+                read -r remote < .rsync
+                if [ -w "$PWD" ] && [ "$uid" != 0 ]; then
+                    rsync -acvzzC --include=core --delete "$remote/" "$PWD"
+                else
+                    [ "$uid" = 0 ] || log "$PWD" "Need root to update"
+
+                    # Similar to the git update, we find the owner of
+                    # the repository and spawn rsync as that user.
+                    (
+                        user=$(_stat "$PWD")
+
+                        [ "$user" = root ] ||
+                            log "Dropping permissions to $user for pull"
+
+                        user=$user as_root rsync -acvzzC --include=core --delete "$remote/" "$PWD"
+                    )
+                fi
+            }
+        else
+            log "$repo" " "
+            printf '%s\n' "Not a remote repository, skipping."
+        fi
+    done
+
+    run_hook post-fetch
+}
+
+# Local Variables:
+# mode: sh
+# End:
diff --git a/lib/cpt-stdio b/lib/cpt-stdio
new file mode 100644
index 0000000..0f19a8e
--- /dev/null
+++ b/lib/cpt-stdio
@@ -0,0 +1,72 @@
+# Text and output related functions
+
+out() {
+    # Print a message as is.
+    printf '%s\n' "$@"
+}
+
+die() {
+    # Print a message and exit with '1' (error).
+    log "$1" "$2" "!>"
+    exit 1
+}
+
+warn() {
+    # Print a warning message
+    log "$1" "$2" "${3:-WARNING}"
+}
+
+sepchar() (
+    # Seperate every character on the given string without resorting to external
+    # processes.
+    [ "$1" ] || return 0; str=$1; set --
+    while [ "$str" ]; do
+        str_tmp=$str
+        for i in $(_seq $(( ${#str} - 1 ))); do
+            str_tmp=${str_tmp%?}
+        done
+        set -- "$@" "$str_tmp"
+        str=${str#$str_tmp}
+    done
+    printf '%s\n' "$@"
+)
+
+contains() {
+    # Check if a "string list" contains a word.
+    case " $1 " in *" $2 "*) return 0; esac; return 1
+}
+
+regesc() {
+    # Escape special regular expression characters as
+    # defined in POSIX BRE. '$.*[\^'
+    printf '%s\n' "$1" |
+    sed 's|\\|\\\\|g;s|\[|\\[|g;s|\$|\\$|g;s|\.|\\.|g;s|\*|\\*|g;s|\^|\\^|g'
+}
+
+prompt() {
+    # If CPT_PROMPT is set to 0, continue This can be useful for installation
+    # scripts and bootstrapping.
+    [ "$CPT_PROMPT" = 0 ] && return 0
+
+    # Ask the user for some input.
+    [ "$1" ] && log "$1"
+    log "Continue?: Press Enter to continue or Ctrl+C to abort here"
+
+    # POSIX 'read' has none of the "nice" options like '-n', '-p'
+    # etc etc. This is the most basic usage of 'read'.
+    # '_' is used as 'dash' errors when no variable is given to 'read'.
+    read -r _ || return 1
+}
+
+pop() {
+    # Remove an item from a "string list". This allows us
+    # to remove a 'sed' call and reuse this code throughout.
+    del=$1
+    shift 2
+
+    for i do [ "$i" = "$del" ] || printf %s " $i "; done
+}
+
+# Local Variables:
+# mode: sh
+# End:
diff --git a/lib/cpt.do b/lib/cpt.do
new file mode 100644
index 0000000..5334a50
--- /dev/null
+++ b/lib/cpt.do
@@ -0,0 +1,14 @@
+SRC_ROOT=..
+
+# shellcheck source=../config.rc
+. ${SRC_ROOT}/config.rc
+
+redo-ifchange cpt.in cpt-*
+
+for lib in cpt-*; do
+    sed -E -n "/^[^[:blank:]]+\(\)[[:blank:]]+[({]/s,^(.*)\(\).*\$,\1() { . \"\$CPT_LIBDIR/$lib\"; \1 \"\$@\";},p" "$lib"
+done |
+
+sed -e '/@AUTOLOADS@/r /dev/stdin' \
+    -e '/@AUTOLOADS@/d' \
+    cpt.in > "$3"
diff --git a/lib/cpt.in b/lib/cpt.in
new file mode 100644
index 0000000..a80a961
--- /dev/null
+++ b/lib/cpt.in
@@ -0,0 +1,178 @@
+#!/bin/sh -ef
+# shellcheck source=/dev/null
+
+log() {
+    # Print a message prettily.
+    #
+    # All messages are printed to stderr to allow the user to hide build
+    # output which is the only thing printed to stdout.
+    #
+    # '${3:-->}':         If the 3rd argument is missing, set prefix to '->'.
+    # '${2:+colorb}':     If the 2nd argument exists, set text style of '$1'.
+    printf '%b%s %b%b%s%b %s\n' \
+           "$colory" "${3:-->}" "$colre" "${2:+$colorb}" "$1" "$colre" "$2" >&2
+}
+
+version() {
+    log "Carbs Packaging Tools" @VERSION@
+    exit 0
+}
+
+trap_set() {
+    # Function to set the trap value.
+    case ${1:-cleanup} in
+        cleanup) trap pkg_clean EXIT INT ;;
+        block)   trap '' INT ;;
+        unset)   trap - EXIT INT ;;
+    esac
+}
+
+_readlinkf() {
+    # Public domain POSIX sh readlink function by Koichi Nakashima
+    [ "${1:-}" ] || return 1
+    max_symlinks=40
+    CDPATH='' # to avoid changing to an unexpected directory
+
+    target=$1
+    [ -e "${target%/}" ] || target=${1%"${1##*[!/]}"} # trim trailing slashes
+    [ -d "${target:-/}" ] && target="$target/"
+
+    cd -P . 2>/dev/null || return 1
+    while [ "$max_symlinks" -ge 0 ] && max_symlinks=$((max_symlinks - 1)); do
+        if [ ! "$target" = "${target%/*}" ]; then
+            case $target in
+                /*) cd -P "${target%/*}/" 2>/dev/null || break ;;
+                *) cd -P "./${target%/*}" 2>/dev/null || break ;;
+            esac
+            target=${target##*/}
+        fi
+
+        if [ ! -L "$target" ]; then
+            target="${PWD%/}${target:+/}${target}"
+            printf '%s\n' "${target:-/}"
+            return 0
+        fi
+
+        # `ls -dl` format: "%s %u %s %s %u %s %s -> %s\n",
+        #   <file mode>, <number of links>, <owner name>, <group name>,
+        #   <size>, <date and time>, <pathname of link>, <contents of link>
+        # https://pubs.opengroup.org/onlinepubs/9699919799/utilities/ls.html
+        link=$(ls -dl -- "$target" 2>/dev/null) || break
+        target=${link#*" $target -> "}
+    done
+    return 1
+}
+
+# CPT Library does "lazy loading" of its functions. Meaning that functions are
+# defined, but the libraries containing the functions aren't loaded until one of
+# those functions are called. This should theoretically decrease the time it
+# takes to execute some script that uses only minimal amount of library
+# functions. When a function listed below is called, its definition is replaced
+# by the one in the loaded library, and executed with the same arguments.
+# @AUTOLOADS@
+
+# main()
+{
+    set -ef
+
+    # Set the library directory if unset, assuming that it shares the same
+    # prefix with the tool.
+    [ "$CPT_LIBDIR" ] || CPT_LIBDIR=$(_readlinkf "${0%/*}/../lib/cpt/")
+
+    # If a parser definition exists, let's run it ourselves. This makes sure we
+    # get the variables as soon as possible.
+    command -v parser_definition >/dev/null && {
+        eval "$(getoptions parser_definition parse "$0")"
+        parse "$@"
+        eval set -- "$REST"
+    }
+
+    # Create the cache directories for CPT and set the variables which point
+    # to them. This is seperate from temporary directories created in
+    # create_cache(). That's because we need these variables set on most
+    # occasions.
+    mkdir -p "${cac_dir:=${CPT_CACHE:=${XDG_CACHE_HOME:-$HOME/.cache}/cpt}}" \
+             "${src_dir:=$cac_dir/sources}" \
+             "${log_dir:=$cac_dir/logs}" \
+             "${bin_dir:=$cac_dir/bin}"
+
+    # Set the location to the repository and package database.
+    pkg_db=var/db/cpt/installed
+
+    # The PID of the current shell process is used to isolate directories
+    # to each specific CPT instance. This allows multiple package manager
+    # instances to be run at once. Store the value in another variable so
+    # that it doesn't change beneath us.
+    pid=${CPT_PID:-$$}
+
+    # Force the C locale to speed up things like 'grep' which disable unicode
+    # etc when this is set. We don't need unicode and a speed up is always
+    # welcome.
+    export LC_ALL=C LANG=C
+
+    # Catch errors and ensure that build files and directories are cleaned
+    # up before we die. This occurs on 'Ctrl+C' as well as success and error.
+    trap_set cleanup
+
+    # Prefer GNU grep if installed as it is much much faster than busybox's
+    # implementation. Very much worth it if you value performance over
+    # POSIX correctness (grep quoted to avoid shellcheck false-positive).
+    grep=$(command -v ggrep) || grep='grep'
+
+    # Prefer libarchive tar or GNU tar if installed as they are  much
+    # much faster than busybox's implementation. Very much worth it if
+    # you value performance.
+    tar=$(command -v bsdtar || command -v gtar) || tar=tar
+
+    # Figure out which 'sudo' command to use based on the user's choice or
+    # what is available on the system.
+    su=${CPT_SU:-$(command -v sls    ||
+                   command -v sudo   ||
+                   command -v doas)} || su=su
+
+    # Store the date and time of script invocation to be used as the name
+    # of the log files the package manager creates during builds.
+    time=$(date '+%Y-%m-%d-%H:%M')
+
+    # Use readelf for fixing dependencies if it is available, fallback to
+    # ldd. readelf shows only the actual dependencies and doesn't include
+    # the libraries required by the dependencies.
+    elf_prog=${CPT_ELF:="$(
+               command -v readelf       ||
+               command -v llvm-readelf  ||
+               command -v eu-readelf)"} || elf_prog=ldd
+
+    # Make note of the user's current ID to do root checks later on.
+    # This is used enough to warrant a place here.
+    uid=$(id -u)
+
+    # Save IFS, so we can restore it back to what it was before.
+    old_ifs=$IFS
+
+    # Make sure that the CPT_ROOT doesn't end with a '/'. This might
+    # break some operations.
+    CPT_ROOT=${CPT_ROOT%"${CPT_ROOT##*[!/]}"}
+
+    # Define an optional sys_arch variable in order to provide
+    # information to build files with architectural information.
+    sys_arch=$(uname -m 2>/dev/null) ||:
+
+    # Define this variable but don't create its directory structure from
+    # the get go. It will be created as needed by package installation.
+    sys_db=$CPT_ROOT/$pkg_db
+
+    # This allows for automatic setup of a CPT chroot and will
+    # do nothing on a normal system.
+    mkdir -p "$CPT_ROOT/" 2>/dev/null ||:
+
+    # Set a value for CPT_COMPRESS if it isn't set.
+    : "${CPT_COMPRESS:=gz}"
+
+    # Unless being piped or the user specifically doesn't want colors, set
+    # colors. This can of course be overriden if the user specifically want
+    # colors during piping.
+    if { [ "$CPT_COLOR" != 0 ] && [ -t 1 ] ;} || [ "$CPT_COLOR" = 1 ]; then
+        colory="\033[1;33m" colorb="\033[1;36m" colre="\033[m"
+    fi
+
+}
diff --git a/lib/lib-cpt.do b/lib/lib-cpt.do
new file mode 100644
index 0000000..1d0a240
--- /dev/null
+++ b/lib/lib-cpt.do
@@ -0,0 +1,13 @@
+SRC_ROOT=..
+
+# shellcheck source=../config.rc
+. ${SRC_ROOT}/config.rc
+
+redo-ifchange cpt.in cpt-*
+
+cat cpt-* |
+sed -e '/@AUTOLOADS@/r /dev/stdin' \
+    -e '/CPT Library/,/@AUTOLOADS@/d' \
+    cpt.in |
+sed -e '/shellcheck source=lib-cpt/d'\
+    -e '/# Local Variables:$/,/# End:$/d' > "$3"