136 lines
3.3 KiB
Bash
Executable file
136 lines
3.3 KiB
Bash
Executable file
#!/bin/sh
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#
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# This chroot script uses symlinks to emulate being in a chroot using
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# the host system as the masterdir
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#
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# It will damage your host system, only use it in disposable
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# containers.
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#
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# 2 extra steps required when using this chroot-style:
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# 1. Symlink / to masterdir inside the void-packages repo
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# 2. write the arch of the host system, as dictated by xbps-uhelper arch
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# into /.xbps_chroot_init
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#
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# The supported way to make use of thie chroot-style is to create
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# a root filesystem that has base-chroot and git installed and
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# have it inside a container engine like Docker.
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#
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# Docker example:
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# $ mkdir -p /tmp/image
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# $ xbps-install -y -r /tmp/image \
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# -R http://mirrors.servercentral.com/voidlinux/current \
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# -S base-chroot
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# $ tar -pC /tmp/image -c . | sudo docker import - voidlinux/masterdir
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# $ rm -rf /tmp/image
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# # docker run --rm -it \
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# -e XBPS_CHROOT_CMD=ethereal \
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# -e XBPS_ALLOW_CHROOT_BREAKOUT=yes \
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# -v $(pwd):/hostrepo voidlinux/masterdir \
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# /bin/bash -c 'ln -s / /hostrepo/masterdir && /hostrepo/xbps-src pkg <pkgname>'
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#
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readonly MASTERDIR="$1"
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readonly DISTDIR="$2"
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readonly HOSTDIR="$3"
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readonly EXTRA_ARGS="$4"
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readonly CMD="$5"
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shift 5
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if [ -z "$MASTERDIR" -o -z "$DISTDIR" ]; then
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echo "$0 MASTERDIR/DISTDIR not set"
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exit 1
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fi
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msg_red() {
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# error messages in bold/red
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[ -n "$NOCOLORS" ] || printf >&2 "\033[1m\033[31m"
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printf "=> ERROR: %s\\n" "$@" >&2
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[ -n "$NOCOLORS" ] || printf >&2 "\033[m"
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}
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fake_mount() {
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# If we already have a symlink from the desired place
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# to the base location then just return 0
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if [ -L "$2" -a "$(readlink "$2")" = "$1" ]; then
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return 0
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fi
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if [ -d "$2" ] && ! rmdir "$2" >/dev/null 2>&1; then
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msg_red "Failed to remove $2, not empty ?\n"
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exit 1
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fi
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[ -f "$2" -o -L "$2" ] && rm -f "$2"
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ln -s "$1" "$2"
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echo "linked $2 -> $1"
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}
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if [ "${XBPS_ALLOW_CHROOT_BREAKOUT}" != "yes" ]; then
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msg_red "chroot-style 'ethereal' requires XBPS_ALLOW_CHROOT_BREAKOUT=yes\n"
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msg_red "This chroot-style is meant for disposable containers and will destroy your system\n"
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exit 1
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fi
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if [ ! -L "$MASTERDIR" -o "$(readlink "$MASTERDIR")" != "/" ]; then
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msg_red "$MASTERDIR isn't symlinked to /!\n"
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exit 1
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fi
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fake_mount "$DISTDIR" "$MASTERDIR"/void-packages
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# Do the same for hostdir
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if [ -n "$HOSTDIR" ]; then
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fake_mount "$HOSTDIR" "$MASTERDIR"/host
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fi
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# xbps-src may send some other binds, parse them here
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while getopts 'b:' c -- "$EXTRA_ARGS"; do
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# Skip everything that's not a bind
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[ "$c" = "b" ] || continue
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from="${OPTARG%:*}"
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to="${OPTARG#*:}"
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fake_mount "$from" "$to"
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mounts="${mounts} $to"
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done
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# Store current directory for returning later
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OLDPWD="$(pwd)"
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# To give the illusion we entered the chroot, cd to /
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cd / || {
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msg_red "Failed to change directory to root!\n"
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exit 1 ; }
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# Tell xbps-src that we are "in the chroot"
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# Start with `env` so our environment var's stay the same
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env IN_CHROOT=1 $CMD $@
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# Store return of the command we care about
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ret="$?"
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# Return to OLDPWD
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cd "${OLDPWD}"
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# Remove the symlink and restore an empty dir to simulate
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# an umount operation.
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if [ -n "$HOSTDIR" ]; then
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rm -f "$MASTERDIR"/host
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mkdir -p "$MASTERDIR"/host
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fi
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# Same as the operation above, do it all for all mountpoints
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# that were passed to us.
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for m in $mounts; do
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rm -f "$m"
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mkdir -p "$m"
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done
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rm -f "$MASTERDIR"/void-packages
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mkdir -p "$MASTERDIR"/void-packages
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exit $ret
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