89 lines
2.3 KiB
Bash
Executable File
89 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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clean() {
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log Unmounting host filesystems; {
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umount "$1/sys/firmware/efi/efivars" 2>/dev/null ||:
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umount "$1/tmp" ||:
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umount "$1/run" ||:
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umount "$1/dev/pts" ||:
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umount "$1/dev/shm" ||:
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umount "$1/dev" ||:
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umount "$1/proc" ||:
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umount "$1/sys" ||:
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}
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log Cleaning leftover host files; {
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rm -f "$1/root/.ash_history"
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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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printf 'mounting %s\n' "$1" >&2
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return 1
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}
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set -- "${1%"${1##*[!/]}"}"
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[ -z "$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"' EXIT INT
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log Mounting host filesystems; {
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mounted "$1/dev" || mount -o bind /dev "$1/dev" ||:
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mounted "$1/proc" || mount -t proc proc "$1/proc" ||:
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mounted "$1/sys" || mount -t sysfs sys "$1/sys" ||:
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mounted "$1/dev/shm" ||
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mount -t tmpfs shmfs "$1/dev/shm" ||:
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mounted "$1/dev/pts" ||
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mount -o bind /dev/pts "$1/dev/pts" ||:
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mounted "$1/tmp" ||
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mount -o mode=1777,nosuid,nodev -t tmpfs tmpfs "$1/tmp" ||:
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mounted "$1/run" ||
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mount -t tmpfs tmpfs "$1/run" ||:
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mounted "$1/sys/firmware/efi/efivars" ||
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mount -t efivarfs efivarfs "$1/sys/firmware/efi/efivars" 2>/dev/null ||:
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}
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log Copying /etc/resolv.conf from host; {
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cp -f /etc/resolv.conf "$1/etc" ||:
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}
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log Entering chroot; {
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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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