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#!/bin/sh
# Usage: uchroot [USER [SCRIPT [ARG]..]]
# Configuration has to be passed trough envrionment.
# ROOT: path to directory to chroot in
# ARCH: optional target architecture (if qemu should be used)
# QEMU_ARCH: optional qemu architecture to replace ARCH
# MOUNT: pairs of two paths separated by colon (LOCAL:INROOT)
set -e
if [ "$(id -u)" != "0" ]; then
exec uroot --binfmt "$0" "$@"
fi
###############################################################
[ -n "$ROOT" ] || {
echo "Variable ROOT has to be defined in environment."
exit 1
}
[ -d "$ROOT" ] || {
echo "There is no such directory: $ROOT" >&2
exit 1
}
[ -d "$ROOT/proc" -a -d "$ROOT/dev" -a -d "$ROOT/sys" ] || {
echo "Root seems to not contain valid rootfs: $ROOT" >&2
exit 1
}
mount --rbind "$ROOT" "$ROOT"
mount -t proc none "$ROOT/proc"
mount --rbind /dev "$ROOT/dev"
mount --rbind /sys "$ROOT/sys"
while IFS=: read src target; do
[ -n "$src" -a -n "$target" ] || continue
mkdir -p "$ROOT/$target"
mount --rbind "$src" "$ROOT/$target"
done <<<"$MOUNT"
cp -f /etc/resolv.conf "$ROOT/etc/resolv.conf"
cp -f /etc/hosts "$ROOT/etc/hosts"
if [ "$ARCH" != "$(arch)" ]; then
qemu_exec="$(which "qemu-${QEMU_ARCH:-$ARCH}")"
cp -f "$qemu_exec" "$ROOT$qemu_exec"
fi
USR="${1:-root}"
shift 2>/dev/null || true
if [ $# -gt 0 ]; then
SCRIPT="$1"
shift
exec chroot "$ROOT" /bin/su -l "$USR" -- -l -c "$SCRIPT" -- "$@"
else
exec chroot "$ROOT" /bin/su -l "$USR" -- -l
fi
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