forked from kiss-community/kiss
96 lines
2.3 KiB
Bash
Executable File
96 lines
2.3 KiB
Bash
Executable File
#!/bin/sh -e
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# Enter a kiss chroot
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log() {
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printf '\033[32m->\033[m %s.\n' "$*"
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}
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die() {
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log "$*" >&2
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exit 1
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}
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run() {
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printf '%s\n' "$*"
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"$@" || return "${_ret:=0}"
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}
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clean() {
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log Unmounting host filesystems; {
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run umount "$1/dev/shm"
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run umount "$1/dev/pts"
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run umount "$1/dev"
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run umount "$1/proc"
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run umount "$1/run"
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run umount "$1/sys/firmware/efi/efivars" 2>/dev/null
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run umount "$1/sys"
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run umount "$1/tmp"
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}
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log Cleaning leftover host files; {
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run rm -f "$1/etc/resolv.conf"
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}
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}
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mounted() {
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# This is a pure shell mountpoint implementation. We're dealing
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# with basic (and fixed/known) input so this doesn't need to
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# handle more complex cases.
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[ -e "$1" ] || return 1
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[ -e /proc/mounts ] || return 1
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while read -r _ target _; do
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[ "$target" = "$1" ] && return 0
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done < /proc/mounts
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return 1
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}
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mmount() {
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dest=$1
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shift
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mounted "$dest" || run mount "$@" "$dest"
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}
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main() {
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# Ensure input does not end in '/'.
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set -- "${1%"${1##*[!/]}"}"
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[ "$1" ] || die Need a path to the chroot
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[ -d "$1" ] || die Given path does not exist
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[ "$(id -u)" = 0 ] || die Script needs to be run as root
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trap 'clean "${1%"${1##*[!/]}"}"' EXIT INT
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log Mounting host filesystems; {
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mmount "$1/dev" -o bind /dev
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mmount "$1/dev/pts" -o bind /dev/pts
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mmount "$1/dev/shm" -t tmpfs shmfs
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mmount "$1/proc" -t proc proc
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mmount "$1/run" -t tmpfs tmpfs
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mmount "$1/sys" -t sysfs sys
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mmount "$1/sys/firmware/efi/efivars" -t efivarfs efivarfs 2>/dev/null
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mmount "$1/tmp" -o mode=1777,nosuid,nodev -t tmpfs tmpfs
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}
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log Copying /etc/resolv.conf from host; {
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run cp -f /etc/resolv.conf "$1/etc"
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}
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log Entering chroot; {
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_ret=1
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run chroot "$1" /usr/bin/env -i \
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HOME=/root \
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TERM="$TERM" \
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SHELL=/bin/sh \
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USER=root \
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CFLAGS="${CFLAGS:--march=x86-64 -mtune=generic -pipe -Os}" \
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CXXFLAGS="${CXXFLAGS:--march=x86-64 -mtune=generic -pipe -Os}" \
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MAKEFLAGS="${MAKEFLAGS:--j$(nproc 2>/dev/null || echo 1)}" \
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/bin/sh -l
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}
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}
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main "$1"
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