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kiss-chroot: improvements

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- now displays exact commands which are executed on enter/leave.
- cleaned up code.
This commit is contained in:
Dylan Araps 2021-07-03 14:13:07 +00:00
parent b6c5a245bd
commit 15e7621d9f
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GPG Key ID: 13295DAC2CF13B5C
1 changed files with 57 additions and 50 deletions
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107
contrib/kiss-chroot
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@ -10,21 +10,25 @@ die() {
exit 1
}
run() {
printf '%s\n' "$*"
"$@" || return "${_ret:=0}"
}
clean() {
log Unmounting host filesystems; {
umount "$1/sys/firmware/efi/efivars" 2>/dev/null ||:
umount "$1/tmp" ||:
umount "$1/run" ||:
umount "$1/dev/pts" ||:
umount "$1/dev/shm" ||:
umount "$1/dev" ||:
umount "$1/proc" ||:
umount "$1/sys" ||:
run umount "$1/dev/shm"
run umount "$1/dev/pts"
run umount "$1/dev"
run umount "$1/proc"
run umount "$1/run"
run umount "$1/sys/firmware/efi/efivars" 2>/dev/null
run umount "$1/sys"
run umount "$1/tmp"
}
log Cleaning leftover host files; {
rm -f "$1/root/.ash_history"
rm -f "$1/etc/resolv.conf"
run rm -f "$1/etc/resolv.conf"
}
}
@ -39,50 +43,53 @@ mounted() {
[ "$target" = "$1" ] && return 0
done < /proc/mounts
printf 'mounting %s\n' "$1" >&2
return 1
}
set -- "${1%"${1##*[!/]}"}"
[ -z "$1" ] && die Need a path to the chroot
[ -d "$1" ] || die Given path does not exist
[ "$(id -u)" = 0 ] || die Script needs to be run as root
trap 'clean "$1"' EXIT INT
log Mounting host filesystems; {
mounted "$1/dev" || mount -o bind /dev "$1/dev" ||:
mounted "$1/proc" || mount -t proc proc "$1/proc" ||:
mounted "$1/sys" || mount -t sysfs sys "$1/sys" ||:
mounted "$1/dev/shm" ||
mount -t tmpfs shmfs "$1/dev/shm" ||:
mounted "$1/dev/pts" ||
mount -o bind /dev/pts "$1/dev/pts" ||:
mounted "$1/tmp" ||
mount -o mode=1777,nosuid,nodev -t tmpfs tmpfs "$1/tmp" ||:
mounted "$1/run" ||
mount -t tmpfs tmpfs "$1/run" ||:
mounted "$1/sys/firmware/efi/efivars" ||
mount -t efivarfs efivarfs "$1/sys/firmware/efi/efivars" 2>/dev/null ||:
mmount() {
dest=$1
shift
mounted "$dest" || run mount "$@" "$dest"
}
log Copying /etc/resolv.conf from host; {
cp -f /etc/resolv.conf "$1/etc" ||:
main() {
# Ensure input does not end in '/'.
set -- "${1%"${1##*[!/]}"}"
[ "$1" ] || die Need a path to the chroot
[ -d "$1" ] || die Given path does not exist
[ "$(id -u)" = 0 ] || die Script needs to be run as root
trap 'clean "${1%"${1##*[!/]}"}"' EXIT INT
log Mounting host filesystems; {
mmount "$1/dev" -o bind /dev
mmount "$1/dev/pts" -o bind /dev/pts
mmount "$1/dev/shm" -t tmpfs shmfs
mmount "$1/proc" -t proc proc
mmount "$1/run" -t tmpfs tmpfs
mmount "$1/sys" -t sysfs sys
mmount "$1/sys/firmware/efi/efivars" -t efivarfs efivarfs 2>/dev/null
mmount "$1/tmp" -o mode=1777,nosuid,nodev -t tmpfs tmpfs
}
log Copying /etc/resolv.conf from host; {
run cp -f /etc/resolv.conf "$1/etc"
}
log Entering chroot; {
_ret=1
run chroot "$1" /usr/bin/env -i \
HOME=/root \
TERM="$TERM" \
SHELL=/bin/sh \
USER=root \
CFLAGS="${CFLAGS:--march=x86-64 -mtune=generic -pipe -Os}" \
CXXFLAGS="${CXXFLAGS:--march=x86-64 -mtune=generic -pipe -Os}" \
MAKEFLAGS="${MAKEFLAGS:--j$(nproc 2>/dev/null || echo 1)}" \
/bin/sh -l
}
}
log Entering chroot; {
chroot "$1" /usr/bin/env -i \
HOME=/root \
TERM="$TERM" \
SHELL=/bin/sh \
USER=root \
CFLAGS="${CFLAGS:--march=x86-64 -mtune=generic -pipe -Os}" \
CXXFLAGS="${CXXFLAGS:--march=x86-64 -mtune=generic -pipe -Os}" \
MAKEFLAGS="${MAKEFLAGS:--j$(nproc 2>/dev/null || echo 1)}" \
/bin/sh -l
}
main "$1"