diff options
| -rwxr-xr-x | contrib/cpt-chroot | 92 |
1 files changed, 80 insertions, 12 deletions
diff --git a/contrib/cpt-chroot b/contrib/cpt-chroot index 2f7eee7..a2ea151 100755 --- a/contrib/cpt-chroot +++ b/contrib/cpt-chroot @@ -1,22 +1,88 @@ #!/bin/sh -e # Enter a chroot +# shellcheck disable=2004 ## SYNOPSIS: ## .Nm cpt-chroot +## .Op Fl m ## .Op Ar dir ## DESCRIPTION: ## .Nm ## is a wrapper script to chroot inside other root filesystems. It automatically ## mounts important filesystems in to the chroot directory, and unmounts them -## when the user exits the chroot and cleans up leftover host files. +## when the user exits the chroot and cleans up leftover host files. If the flag +## .Fl m +## is given, +## .Nm +## does not try to mount or unmount any filesystems. + +# We generate the parser into the script, because we don't want this script to +# depend on cpt-lib. +nomount='' +REST='' +parse() { + OPTIND=$(($#+1)) + while OPTARG= && [ $# -gt 0 ]; do + case $1 in + --?*=*) OPTARG=$1; shift + eval 'set -- "${OPTARG%%\=*}" "${OPTARG#*\=}"' ${1+'"$@"'} + ;; + --no-*) unset OPTARG ;; + -[mh]?*) OPTARG=$1; shift + eval 'set -- "${OPTARG%"${OPTARG#??}"}" -"${OPTARG#??}"' ${1+'"$@"'} + OPTARG= ;; + esac + case $1 in + '-m') + [ "${OPTARG:-}" ] && OPTARG=${OPTARG#*\=} && set "noarg" "$1" && break + eval '[ ${OPTARG+x} ] &&:' && OPTARG='1' || OPTARG='' + nomount="$OPTARG" + ;; + '-h'|'--help') + usage + exit 0 ;; + --) + shift + while [ $# -gt 0 ]; do + REST="${REST} \"\${$(($OPTIND-$#))}\"" + shift + done + break ;; + [-]?*) + set "unknown" "$1"; break ;; + *) + REST="${REST} \"\${$(($OPTIND-$#))}\"" + esac + shift + done + [ $# -eq 0 ] && { OPTIND=1; unset OPTARG; return 0; } + case $1 in + unknown) set "Unrecognized option: $2" "$@" ;; + noarg) set "Does not allow an argument: $2" "$@" ;; + required) set "Requires an argument: $2" "$@" ;; + pattern:*) set "Does not match the pattern (${1#*:}): $2" "$@" ;; + notcmd) set "Not a command: $2" "$@" ;; + *) set "Validation error ($1): $2" "$@" + esac + echo "$1" >&2 + exit 1 +} +usage() { printf '%s\n' "usage: ${0##*/} [-m] [dir]" "" "Options:" \ + " -m Don't mount or unmount directories" +} + +parser_definition() { + setup REST help:usage -- "usage: ${0##*/} [-m] [dir]" + msg -- '' 'Options:' + flag nomount -m -- "Don't mount or unmount directories" + disp :usage -h --help hidden:1 +} log() { printf '\033[32m->\033[m %s.\n' "$*" } -usage() { printf '%s [dir]\n' "${0##*/}"; exit 0;} - die() { log "$*" >&2 exit 1 @@ -35,7 +101,7 @@ clean() { } main() { - case "$1" in ''|--help|-h) usage; esac + parse "$@" && eval set -- "$REST" [ -d "$1" ] || die Given path does not exist [ "$(id -u)" = 0 ] || die Script needs to be run as root @@ -48,17 +114,19 @@ main() { esac } - trap 'clean "$1"' EXIT INT + [ -z "$nomount" ] && { + trap 'clean "$1"' EXIT INT - log Mounting /dev, /proc and /sys from host; { - mountpoint -q "$1/dev" || mount -o bind /dev "$1/dev" - mountpoint -q "$1/proc" || mount -t proc proc "$1/proc" - mountpoint -q "$1/sys" || mount -t sysfs sys "$1/sys" + log Mounting /dev, /proc and /sys from host; { + mountpoint -q "$1/dev" || mount -o bind /dev "$1/dev" + mountpoint -q "$1/proc" || mount -t proc proc "$1/proc" + mountpoint -q "$1/sys" || mount -t sysfs sys "$1/sys" - } + } - log Copying /etc/resolv.conf from host; { - [ -f "$1/etc/resolv.conf" ] || cp /etc/resolv.conf "$1/etc" + log Copying /etc/resolv.conf from host; { + [ -f "$1/etc/resolv.conf" ] || cp /etc/resolv.conf "$1/etc" + } } log Entering chroot; { |