diff options
Diffstat (limited to 'tools/cpt-lib')
| -rw-r--r-- | tools/cpt-lib | 1526 |
1 files changed, 1526 insertions, 0 deletions
diff --git a/tools/cpt-lib b/tools/cpt-lib new file mode 100644 index 0000000..c72f7f9 --- /dev/null +++ b/tools/cpt-lib @@ -0,0 +1,1526 @@ +#!/bin/sh -ef +# shellcheck source=/dev/null +# +# This is a simple package manager written in POSIX 'sh' for use +# in KISS Linux (https://k1ss.org). +# +# This script runs with '-ef' meaning: +# '-e': Abort on any non-zero exit code. +# '-f': Disable globbing globally. +# +# [1] Warnings related to word splitting and globbing are disabled. +# All word splitting in this script is *safe* and intentional. +# +# Dylan Araps. + +version() { + log "Carbs Packaging Tools" 3.0.0 + exit 0 +} + +out() { + # Print a message as is. + printf '%s\n' "$@" +} + +log() { + # Print a message prettily. + # + # All messages are printed to stderr to allow the user to hide build + # output which is the only thing printed to stdout. + # + # '\033[1;32m' Set text to color '2' and make it bold. + # '\033[m': Reset text formatting. + # '${3:-->}': If the 3rd argument is missing, set prefix to '->'. + # '${2:+\033[1;3Xm}': If the 2nd argument exists, set text style of '$1'. + printf '\033[1;33m%s \033[m%b%s\033[m %s\n' \ + "${3:-->}" "${2:+"\033[1;36m"}" "$1" "$2" >&2 +} + +die() { + # Print a message and exit with '1' (error). + log "$1" "$2" "!>" + exit 1 +} + +warn() { + # Print a warning message + log "WARN" "$1" "${2:-!>}" +} + +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 a CPT_NOPROMPT variable is set, continue. + # This can be useful for installation scripts and + # bootstrapping. + [ "$CPT_PROMPT" = 0 ] && return 0 + + # Ask the user for some input. + [ "$1" ] && log "$1" + log "Continue?: Press Enter to continue or Ctrl+C to abort here" + + # POSIX 'read' has none of the "nice" options like '-n', '-p' + # etc etc. This is the most basic usage of 'read'. + # '_' is used as 'dash' errors when no variable is given to 'read'. + read -r _ || return 1 +} + +as_root() { + # Simple function to run a command as root using either 'sudo', + # 'doas' or 'su'. Hurrah for choice. + [ "$uid" = 0 ] || log "Using '${su:-su}' (to become ${user:=root})" + + case ${su##*/} in + sudo) sudo -E -u "$user" -- "$@" ;; + doas) doas -u "$user" -- "$@" ;; + su) su -pc "env USER=$user $* <&3" "$user" 3<&0 </dev/tty ;; + *) die "Invalid CPT_SU value: $su" ;; + esac +} + +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 +} + +run_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 + + # This is not a misspelling, can be ignored safely. + # shellcheck disable=2153 + [ -f "$CPT_HOOK" ] || return 0 + + log "$2" "Running $1 hook" + + TYPE=${1:-null} PKG=${2:-null} DEST=${3:-null} . "$CPT_HOOK" +} + +decompress() { + case $1 in + *.tar) cat ;; + *.bz2) bzip2 -cd ;; + *.xz|*.txz) xz -dcT 0 ;; + *.tgz|*.gz) gzip -cd ;; + *.zst) zstd -cd ;; + esac < "$1" +} + +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" "$1"; done +} + +pkg_isbuilt() ( + # Check if a package is built or not. + repo_dir=$(pkg_find "$1") + read -r ver rel < "$repo_dir/version" + + set +f + for tarball in "$bin_dir/$1#$ver-$rel.tar."*; do + [ -f "$tarball" ] && return 0 + done + return 1 +) + +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 ] || die "$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_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 + + unset 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 $version" + done +} + +pkg_cache() { + read -r version release 2>/dev/null < "$(pkg_find "$1")/version" + + set +f; set -f -- "$bin_dir/$1#$version-$release.tar."* + tar_file=$1 + + [ -f "$tar_file" ] +} + +pkg_sources() { + # Download any remote package sources. The existence of local + # files is also checked. + 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 + # Comment. + if [ -z "${src##\#*}" ]; then : + + # Remote source (cached). + elif [ -f "${src##*/}" ]; then + log "$1" "Found cached source '${src##*/}'" + + # Remote git repository. + elif [ -z "${src##git+*}" ]; then + # This is a checksums check, skip it. + [ "$2" ] && continue + + # Since git is an optional dependency, make sure + # it is available on the system. + command -v git >/dev/null || + die "git must be installed in order to acquire ${src##git+}" + + mkdir -p "$mak_dir/$1/$dest" + + # Run in a subshell to keep the variables, path and + # argument list local to each loop iteration. + ( + repo_src=${src##git+} + + log "$1" "Cloning ${repo_src%[@#]*}" + + # Git has no option to clone a repository to a + # specific location so we must do it ourselves + # beforehand. + cd "$mak_dir/$1/$dest" 2>/dev/null || die + + # Clear the argument list as we'll be overwriting + # it below based on what kind of checkout we're + # dealing with. + set -- "$repo_src" + + # If a branch was given, shallow clone it directly. + # This speeds things up as we don't have to grab + # a lot of unneeded commits. + [ "${src##*@*}" ] || + set -- -b "${src##*@}" "${repo_src%@*}" + + # Maintain compatibility with older versions of + # cpt by shallow cloning all branches. This has + # the added benefit of allowing checkouts of + # specific commits in specific branches. + [ "${src##*#*}" ] || + set -- --no-single-branch "${repo_src%#*}" + + # Always do a shallow clone as we will unshallow it if + # needed later (when a commit is desired). + git clone --depth=1 "$@" . + + ) || die "$1" "Failed to clone $src" + + # Remote source. + elif [ -z "${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. + log "$1" "Extracting sources" + + repo_dir=$(pkg_find "$1") + + while read -r src dest || [ "$src" ]; do + mkdir -p "$mak_dir/$1/$dest" && cd "$mak_dir/$1/$dest" + + case $src in + # Git repository with supplied commit hash. + git+*\#*) + log "Checking out ${src##*#}" + + # A commit was requested, unshallow the repository. + # This will convert it to a regular repository with + # full history. + git fetch --unshallow + + # Try to checkout the repository. If we fail here, + # the requested commit doesn't exist. + git -c advice.detachedHead=false checkout "${src##*#}" || + die "Commit hash ${src##*#} doesn't exist" + ;; + + # Git repository, comment or blank line. + git+*|\#*|'') continue ;; + + # Only 'tar' an 'zip' archives are currently supported for + # extraction. Other filetypes are simply copied to '$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 + ;; + + *://*.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_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 "$1" >/dev/null) && return + + # Recurse through the dependencies of the child packages. + while read -r dep _ || [ "$dep" ]; do + [ "${dep##\#*}" ] && pkg_depends "$dep" + done 2>/dev/null < "$(pkg_find "$1")/depends" ||: + + # After child dependencies are added to the list, + # add the package which depends on them. + [ "$2" = explicit ] || deps="$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 $redro" + } done + + deps= +} + +pkg_strip() { + # Strip package binaries and libraries. This saves space on the + # system as well as on the tarballs we ship for installation. + + # Package has stripping disabled, stop here. + [ -f "$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_fixdeps() { + # Dynamically look for missing runtime dependencies by checking + # each binary and library with 'ldd'. 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 + # Run 'ldd' on the file and parse each line. The code + # then checks to see which packages own the linked + # libraries and it prints the result. + ldd "$file" 2>/dev/null | while read -r dep; do + # Skip lines containing 'ldd'. + [ "${dep##*ldd*}" ] || continue + + # Extract the file path from 'ldd' output, and + # canonicalize the path. + dep=${dep#* => } + dep=${dep% *} + dep=$(cpt-readlink "$dep") + + # Figure out which package owns the file. + own=$("$grep" -lFx "${dep#$CPT_ROOT}" "$@") + + # If the package wasn't found, retry by removing + # the '/usr' prefix. + if [ -z "$own" ] && [ -z "${dep##$CPT_ROOT/usr*}" ]; then + own=$("$grep" -lFx "${dep#$CPT_ROOT/usr}" "$@") + dep=${dep#/usr} + fi + + # Extract package name from 'grep' match. + own=${own%/*} + own=${own##*/} + + case $own in "$pkg_name"|"$pkg_name-bin"|"") continue ; esac + printf 'Found %s (%s) in (%s)\n' "$own" "$dep" \ + "${file##$pkg_dir/$pkg_name}" >/dev/tty + + printf '%s\n' "$own" + done ||: + done >> depends + + # Remove duplicate entries from the new depends file. + # This removes duplicate lines looking *only* at the + # first column. + sort -uk1,1 -o depends depends 2>/dev/null ||: + + # Display a diff of the new dependencies against the old ones. + diff -U 3 "$dep_file" depends 2>/dev/null ||: + + # Remove the depends file if it is empty. + [ -s depends ] || rm -f depends +} + +pkg_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=$explicit + + # If an explicit package is a dependency of another explicit + # package, remove it from the explicit list as it needs to be + # installed as a dependency. + # shellcheck disable=2086 + for pkg do + contains "$deps" "$pkg" && explicit=$(pop "$pkg" from $explicit) + done + + # See [1] at top of script. + # shellcheck disable=2046,2086 + 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" + + # 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/$pkg" + + # Call the build script, log the output to the terminal + # and to a file. There's no PIPEFAIL in POSIX shelll so + # we must resort to tricks like killing the script ourselves. + { "$repo_dir/build" "$pkg_dir/$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-$pid" + + # Delete the log file if the build succeeded to prevent + # the directory from filling very quickly with useless logs. + [ "$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/" + + # We never ever want this. Let's end the endless conflicts + # and remove it. This will be the only exception for a + # specific removal of this kind. + find "$pkg_dir/$pkg" -name charset.alias -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 "$pkg" + pkg_fixdeps "$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 "$1") + + while read -r src _ || [ "$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 + printf 'git %s\n' "$src" + 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. + for pkg do pkg_checksums "$pkg" | diff - "$(pkg_find "$pkg")/checksums" || { + log "$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/${file#/} + + # We will only follow the symlinks of the directories, so we + # reserve the directory name in this 'dirname' value. cpt-readlink + # functions in a similar fashion to 'readlink -f', it makes sure + # every component except for the first one to be available on + # the directory structure. If we cannot find it in the system, + # we don't need to make this much more complex by trying so + # hard to find it. Simply use the original directory name. + dirname="$(cpt-readlink "${file%/*}" 2>/dev/null)" || + dirname="${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-m" + + 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-m" ] || 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-m" -- "$@" > "$CPT_TMPDIR/$pid-c" ||: + + + # Enable alternatives automatically if it is safe to do so. + # This checks to see that the package that is about to be installed + # doesn't overwrite anything it shouldn't in '/var/db/cpt/installed'. + "$grep" -q ":/var/db/cpt/installed/" "$CPT_TMPDIR/$pid-c" || 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/$pid-c" + + # Rewrite the package's manifest to update its location + # to its new spot (and name) in the choices directory. + pkg_manifest "$p_name" "$tar_dir" 2>/dev/null + + elif [ -s "$CPT_TMPDIR/$pid-c" ]; then + log "Package '$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 "$2" ]; then + # Figure out which package owns the file we are going to swap for + # another package's. + # + # Print the full path to the manifest file which contains + # the match to our search. + pkg_owns=$(set +f; "$grep" -lFx "$2" "$sys_db/"*/manifest) ||: + + # Extract the package name from the path above. + pkg_owns=${pkg_owns%/*} + pkg_owns=${pkg_owns##*/} + + [ "$pkg_owns" ] || + 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 "$1" "Can't remove package, others depend on it" + } + # Block being able to abort the script with 'Ctrl+C' during removal. + # Removes all risk of the user aborting a package removal leaving + # an incomplete package installed. + trap '' INT + + if [ -x "$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 pkg_clean EXIT INT + + 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 '' INT + + # 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 pkg_clean EXIT INT + + 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_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 -- $CPT_PATH; unset IFS; } + + # Update each repository in '$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 ||: + + if [ -d .git ]; then + + command -v git >/dev/null || { + log "$repo" " " + printf '%s\n' "Git is not installed, skipping." + continue + } + + [ "$(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 "$PWD" "Need root to update" + + # Find out the owner of the repository and spawn + # git as this user below. + # + # This prevents 'git' from changing the original + # ownership of files and directories in the rare + # case that the repository is owned by a 3rd user. + ( + user=$(cpt-stat "$PWD") || user=root + id -u "$user" >/dev/null 2>&1 || user=root + + [ "$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 [ -f .rsync ]; then + 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=$(cpt-stat "$PWD") || user=root + id -u "$user" >/dev/null 2>&1 || user=root + + [ "$user" = root ] || + log "Dropping permissions to $user for pull" + + user=$user as_root rsync -acvzzC --include=core --delete "$remote/" "$PWD" + ) + fi + else + log "$repo" " " + printf '%s\n' "Not a remote repository, skipping." + fi + done + + run_hook post-fetch +} + +pkg_updates(){ + # Check all installed packages for updates. So long as the installed + # version and the version in the repositories differ, it's considered + # an update. + [ "$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. + [ "$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 + + # Block 'Ctrl+C' while cache is being cleaned. + trap '' INT + + # Remove temporary items. + rm -rf -- "$mak_dir" "$pkg_dir" "$tar_dir" \ + "$CPT_TMPDIR/$pid-c" "$CPT_TMPDIR/$pid-m" +} + +main() { + set -ef + + # Die here if the user has no set CPT_PATH. This is a rare occurance + # as the environment variable should always be defined. + [ "$CPT_PATH" ] || die "\$CPT_PATH needs to be set" + + # 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 pkg_clean EXIT INT + + # 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 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 uring builds. + time=$(date '+%Y-%m-%d-%H:%M') + + # Make note of the user's current ID to do root checks later on. + # This is used enough to warrant a place here. + uid=$(id -u) + + # Make sure that the CPT_ROOT doesn't end with a '/'. This might + # break some operations. + [ -z "$CPT_ROOT" ] || [ "${CPT_ROOT##*/}" ] || { + warn "Your CPT_ROOT variable shouldn't end with '/'" + 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}" + + # 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 "${cac_dir:=${CPT_CACHE:=${XDG_CACHE_HOME:-$HOME/.cache}/cpt}}" \ + "${CPT_TMPDIR:=$cac_dir}" \ + "${mak_dir:=$CPT_TMPDIR/build-$pid}" \ + "${pkg_dir:=$CPT_TMPDIR/pkg-$pid}" \ + "${tar_dir:=$CPT_TMPDIR/extract-$pid}" \ + "${src_dir:=$cac_dir/sources}" \ + "${log_dir:=$cac_dir/logs}" \ + "${bin_dir:=$cac_dir/bin}" + + # Disable color escape sequences if running in a subshell. + # This behaviour can be changed by adding a CPT_COLOR + # variable to the environment. If it is set to 1 it will + # always enable color escapes, and if set to 0 it will + # always disable color escapes. + if [ "$CPT_COLOR" = 1 ]; then color=1 + elif [ "$CPT_COLOR" = 0 ] || ! [ -t 1 ]; then + log() { printf '%s %s %s\n' "${3:-->}" "$1" "$2" >&2 ;} + else color=1 + fi + +} + +main "$@" |