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-rwxr-xr-xcontrib/cpt-chroot92
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; {