From d562390407eec6ecc83a9f19635258fbe83b6695 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Karel=20Ko=C4=8D=C3=AD?= <cynerd@email.cz>
Date: Sun, 14 Oct 2018 17:31:02 +0200
Subject: alpine: move it to templates and try to add qemu support

---
 scripts/uchroot | 35 +++++++++++++++++++++++++++++------
 1 file changed, 29 insertions(+), 6 deletions(-)

(limited to 'scripts/uchroot')

diff --git a/scripts/uchroot b/scripts/uchroot
index b11981a..b94e14f 100755
--- a/scripts/uchroot
+++ b/scripts/uchroot
@@ -1,7 +1,11 @@
 #!/bin/sh
 set -e
 [ $# -ge 1 ] || {
-	echo "Usage: uchroot ROOT [USER] [CMD]" >&2
+	echo "Usage: uchroot USER [CMD] [ARG].." >&2
+	echo "Configuration has to be passed trough envrionment."
+	echo "  ROOT: path to directory to chroot in"
+	echo "  ARCH: optional target architecture (if qemu should be used)"
+	echo "  MOUNT: pairs of two paths separated by colon (LOCAL:INROOT)"
 	exit 1
 }
 
@@ -10,10 +14,17 @@ if [ "$(id -u)" != "0" ]; then
 fi
 ###############################################################
 
-ROOT="$1"
-USR="${2:-root}"
-shift 2
-[ $# -lt 1 ] && CMD="" || CMD="-c '$@'"
+[ -n "$ROOT" ] || {
+	echo "Variable ROOT has to be defined in environment."
+	exit 1
+}
+
+USR="${1:-root}"
+shift
+[ $# -lt 1 ] && CMD="" || {
+	CMD="-c \"$1\""
+	shift
+}
 
 [ -d "$ROOT" ] || {
 	echo "There is no such directory: $ROOT" >&2
@@ -24,11 +35,23 @@ shift 2
 	exit 1
 }
 
+EXECUTOR=
+
 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 "$target" ] || continue
+	mount --rbind "$src" "$ROOT/$target"
+done <<<"$MOUNT"
+
 cp -f /etc/resolv.conf "$ROOT/etc/resolv.conf"
 cp -f /etc/hosts "$ROOT/etc/hosts"
+if [ -n "$ARCH" -a "$ARCH" != "$(arch)" ]; then
+	cp -f "$(which "qemu-$ARCH")" "$ROOT/qemu"
+	EXECUTOR=/qemu
+fi
 
-exec chroot "$ROOT" /bin/sh -c ". /etc/profile && exec su $CMD -l $USR" "$0"
+exec chroot "$ROOT" $EXECUTOR /bin/sh -c \
+	". /etc/profile && exec su -l $USR $CMD \"\$@\"" -- "$@"
-- 
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