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|
#!/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. 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: ${0##*/} [-m] [dir]"
msg -- '' 'Options:'
flag nomount -m -- "Don't mount or unmount directories"
disp :usage -h --help hidden:1
}
log() {
printf '\033[32m->\033[m %s.\n' "$*"
}
die() {
log "$*" >&2
exit 1
}
clean() {
log Unmounting /dev, /proc and /sys from chroot; {
umount "$1/dev" ||:
umount "$1/proc" ||:
umount "$1/sys" ||:
}
log Cleaning leftover host files; {
rm -f "$1/root/.ash_history"
}
}
main() {
parse "$@" && eval set -- "$REST"
[ -d "$1" ] || die Given path does not exist
[ "$(id -u)" = 0 ] || die Script needs to be run as root
[ "$2" ] || {
march=$(uname -m 2>/dev/null) ||:
case "$march" in
'') march=native ;;
x86_64) march=x86-64 ;;
i*86) march=i686 ;;
esac
}
[ -z "$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 Copying /etc/resolv.conf from host; {
[ -f "$1/etc/resolv.conf" ] || cp /etc/resolv.conf "$1/etc"
}
}
log Entering chroot; {
chroot "$1" /usr/bin/env -i \
HOME=/root \
TERM="$TERM" \
SHELL=/bin/sh \
USER=root \
CFLAGS="${CFLAGS:--march=$march -mtune=generic -pipe -Os}" \
CXXFLAGS="${CXXFLAGS:--march=$march -mtune=generic -pipe -Os}" \
MAKEFLAGS="${MAKFLAGS:--j$(nproc 2>/dev/null || echo 1)}" \
/bin/sh -l
}
}
main "$@"
|
