Fix boot with LABEL containting one or several '/'

As there is no /dev/disk/by-label//, we need to follow udev
on  escape the '/' character with  \x2f

don't rely on sed, as we might not have it in initramfs.

(closes: #489008)

Reported-by: Josh Triplett <josh@freedesktop.org>
Tested-by: Andres Salomon <dilinger@debian.org>

thanks for dilinger to pushing the first easy solution to a complete,
so we don't have to revisit the case.

1 files changed, 28 insertions, 1 deletions

diff --git a/init b/init
index 072d82c..7f549b1 100755
--- a/init
+++ b/init
@@ -62,7 +62,34 @@ for x in $(cat /proc/cmdline); do
 		ROOT=${x#root=}
 		case $ROOT in
 		LABEL=*)
-			ROOT="/dev/disk/by-label/${ROOT#LABEL=}"
+			ROOT="${ROOT#LABEL=}"
+
+			# support / in LABEL= paths (escape to \x2f)
+			case "${ROOT}" in
+			*[/]*)
+			if [ -x "$(command -v sed)" ]; then
+				ROOT="$(echo ${ROOT} | sed 's,/,\\x2f,g')"
+			else
+				if [ "${ROOT}" != "${ROOT#/}" ]; then
+					ROOT="\x2f${ROOT#/}"
+				fi
+				if [ "${ROOT}" != "${ROOT%/}" ]; then
+					ROOT="${ROOT%/}\x2f"
+				fi
+				IFS='/'
+				newroot=
+				for s in $ROOT; do
+					if [ -z "${newroot}" ]; then
+						newroot="${s}"
+					else
+						newroot="${newroot}\\x2f${s}"
+					fi
+				done
+				unset IFS
+				ROOT="${newroot}"
+			fi
+			esac
+			ROOT="/dev/disk/by-label/${ROOT}"
 			;;
 		UUID=*)
 			ROOT="/dev/disk/by-uuid/${ROOT#UUID=}"