From 610c06cafd108f9af8d246988b9ce518aa2895f2 Mon Sep 17 00:00:00 2001
From: Tails developers <amnesia@boum.org>
Date: Sun, 8 Apr 2012 20:23:57 +0200
Subject: [PATCH] Adding support for the findiso boot parameter (Closes:
 #656135).

Thanks to the grml team for the initial patch,
thanks to adrian15sgd@gmail.com for bringing it to a mergeable state.
---
 manpages/en/live-boot.7 |  2 ++
 scripts/live            | 35 +++++++++++++++++++++++++++++++++++
 scripts/live-helpers    | 17 +++++++++++++++++
 3 files changed, 54 insertions(+)

diff --git a/manpages/en/live-boot.7 b/manpages/en/live-boot.7
index 3d92e62..e5ac8ab 100644
--- a/manpages/en/live-boot.7
+++ b/manpages/en/live-boot.7
@@ -66,6 +66,8 @@ Target <target-name>
   Lun 0 Path=<path-to-your-live-image.iso>,Type=fileio,IOMode=ro
   # If you want to boot multiple machines you might want to look at tuning some parameters like
   # Wthreads or MaxConnections
+.IP "\fBfindiso\fR=\fI/PATH/TO/IMAGE\fI" 4
+Look for the specified ISO file on all disks where it usually looks for the .squashfs file (so you don't have to know the device name as in fromiso=....).
 .IP "\fBfromiso\fR=\fI/PATH/TO/IMAGE\fI" 4
 Allows to use a filesystem from within an iso image that's available on live-media.
 .IP "\fBignore_uuid\fR" 4
diff --git a/scripts/live b/scripts/live
index 46407c1..8046cc2 100755
--- a/scripts/live
+++ b/scripts/live
@@ -1355,6 +1355,21 @@ check_dev ()
 		mount -t ${fstype} -o ro,noatime "${devname}" ${mountpoint} || continue
 		[ -n "$devuid" ] && echo "$devuid" >> $tried
 
+		if [ -n "${FINDISO}" ]
+		then
+			if [ -f ${mountpoint}/${FINDISO} ]
+			then
+				umount ${mountpoint}
+				mkdir -p /live/findiso
+				mount -t ${fstype} -o ro,noatime "${devname}" /live/findiso
+				loopdevname=$(setup_loop "/live/findiso/${FINDISO}" "loop" "/sys/block/loop*" 0 "")
+				devname="${loopdevname}"
+				mount -t iso9660 -o ro,noatime "${devname}" ${mountpoint}
+			else
+				umount ${mountpoint}
+			fi
+		fi
+
 		if is_live_path ${mountpoint} && \
 			([ "${skip_uuid_check}" ] || matches_uuid ${mountpoint})
 		then
@@ -1641,6 +1656,26 @@ mountroot ()
 	# when booting FAI, this simple workaround solves it
 	ls /root/* >/dev/null 2>&1
 
+	# Move findiso directory to the new root filesystem so that programs there can get at it.
+	if [ -d /live/findiso ] && [ ! -d /root/live/findiso ]
+	then
+		mkdir -p /root/live/findiso
+		mount -n --move /live/findiso /root/live/findiso
+	fi
+
+	# if we do not unmount the ISO we can't run "fsck /dev/ice" later on
+	# because the mountpoint is left behind in /proc/mounts, so let's get
+	# rid of it when running from RAM
+	if [ -n "$FINDISO" ] && [ "${TORAM}" ]
+	then
+		losetup -d /dev/loop0
+
+		if is_mountpoint /live/findiso
+		then
+			umount /root/live/findiso
+		fi
+	fi
+
 	# copy snapshot configuration if exists
 	if [ -f snapshot.conf ]
 	then
diff --git a/scripts/live-helpers b/scripts/live-helpers
index e25e4bc..456c2d7 100644
--- a/scripts/live-helpers
+++ b/scripts/live-helpers
@@ -143,6 +143,11 @@ Arguments ()
 				export STATICIP
 				;;
 
+			findiso=*)
+				FINDISO="${ARGUMENT#findiso=}"
+				export FINDISO
+				;;
+
 			live-getty)
 				LIVE_GETTY="1"
 				export LIVE_GETTY
@@ -1579,3 +1584,15 @@ fix_home_rw_compatibility ()
 /home source=." > "${include_list}"
 	fi
 }
+
+is_mountpoint () {
+
+	directory="$1"
+
+	if [ $(stat -fc%d:%D "${directory}") != $(stat -fc%d:%D "${directory}/..") ]
+	then
+		return 0
+	else
+		return 1
+	fi
+}
-- 
2.1.4