From 0cc00b53d8e918699413dbe1ddd1989bb4ddec4a Mon Sep 17 00:00:00 2001
From: Natanael Copa <ncopa@alpinelinux.org>
Date: Wed, 15 Jul 2015 15:10:42 +0200
Subject: [PATCH] setup-bootable: warn and fix kernel name change

---
 setup-bootable.in | 103 +++++++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 94 insertions(+), 9 deletions(-)

diff --git a/setup-bootable.in b/setup-bootable.in
index 116f776..35a5f73 100644
--- a/setup-bootable.in
+++ b/setup-bootable.in
@@ -84,10 +84,87 @@ find_disk_dev() {
 	return 1
 }
 
+find_syslinux_cfg() {
+	# find where new syslinux.cfg is
+	for i in boot/syslinux/syslinux.cfg syslinux.cfg; do
+		if [ -e "$1"/$i ]; then
+			syslinux_cfg=$i
+			vecho "Found $syslinux_cfg"
+			break
+		fi
+	done
+}
+
+fix_syslinux_kernel() {
+	echo "Fixing $syslinux_cfg: kernel $1 -> $2"
+		sed -i -e "/^\s*[Kk][Ee][Rr][Nn][Ee][Ll]\s/s|$1|$2|" \
+                "$destdir/$syslinux_cfg"
+}
+
+fix_syslinux_initrd() {
+	echo "Fixing $syslinux_cfg: initrd $1 -> $2"
+	sed -i -e "/^\s*[Ii][Nn][Ii][Tt][Rr][Dd]\s/s|$1|$2|" \
+		-e "/^\s*[Aa][Pp][Pp][Ee][Nn][Dd]\s/s|initrd=$1|initrd=$2|" \
+                "$destdir/$syslinux_cfg"
+}
+
+check_syslinux() {
+	if [ -z "$syslinux_cfg" ]; then
+		find_syslinux_cfg "$destdir"
+	fi
+	if [ -z "$syslinux_cfg" ]; then
+		die "Could not find any syslinux.cfg. Aborting"
+	fi
+
+	# kernels
+	for i in $(awk 'tolower($1) == "kernel" {print $2}' "$destdir"/$syslinux_cfg); do
+		k="${destdir%/}/${i#/}"
+		f=${k##*/}
+
+		if [ -e "$k" ] && [ "${f#vmlinuz}" != "$f" ]; then
+			continue
+		fi
+
+		if [ -e "${k%/*}"/vmlinuz-$f ] && [ -n "$fix_syslinux_cfg" ]; then
+			fix_syslinux_kernel "$i" "${i%/*}"/vmlinuz-$f
+		elif ! [ -e "$k" ]; then
+			echo "Warning: $syslinux_cfg: kernel $k  was not found"
+			echo "         Run $0 -c -f "$destdir" to fix"
+		fi
+	done
+
+	#initramfs
+	initrds=$(awk 'tolower($1) == "initrd" {print $2}' \
+			"$destdir"/$syslinux_cfg)
+	for i in $(awk 'tolower($1) == "append" {print $0}' \
+			"$destdir"/$syslinux_cfg); do
+		case $i in
+			initrd=*) initrds=${i#initrd=};;
+		esac
+	done
+
+	for i in $initrds; do
+		if [ -e "$destdir"/$i ]; then
+			continue
+		fi
+		fname=${i##*/}
+		flavor=${fname%.gz}
+
+		new=${i%/*}/initramfs-$flavor
+		if [ -e "$destdir"/$new ] && [ -n "$fix_syslinux_cfg" ]; then
+			fix_syslinux_initrd "$i" "$new"
+		else
+			echo "Warning: initrd $i was not found. System will likely not boot"
+			echo "         Run $0 -f -c "$destdir" to fix"
+		fi
+	done
+}
+
 usage() {
 	cat <<__EOF__
 $prog $version
 usage: $prog [-fhUusv] SOURCE [DEST]
+       $prog -c DIR
 
 Copy the contents of SOURCE to DEST and make DEST bootable.
 
@@ -97,19 +174,24 @@ or a device. If DEST is ommitted /media/usb will be used.
 Options:
  -f  Force overwrite existing files. Will overwrite syslinux.cfg if upgrade.
  -h  Show this help.
+ -k  fix kernel and initrd name in syslinux.cfg if needed.
  -U  Replace current alpine_dev in syslinux.cfg with UUID if UUID found.
  -u  Upgrade mode. Keep existing syslinux.cfg and don't run syslinux.
  -s  Force run syslinux, even if upgrade mode.
  -v  Verbose mode. Display whats going on.
 
+ -c  Check syslinux.cfg in destination DIR. Use with -f to fix.
+
 __EOF__
 	exit 1
 }
 
-while getopts "fhUusv" opt; do
+while getopts "c:fhkUusv" opt; do
 	case "$opt" in
-	f) force=1;;
+	c) check_syslinux="$OPTARG";;
+	f) force=1; fix_syslinux_cfg=1;;
 	h) usage;;
+	k) fix_syslinux_cfg=1;;
 	U) replace_alpine_dev=1;;
 	u) upgrade=1;;
 	s) syslinux=1;;
@@ -122,6 +204,11 @@ shift $(($OPTIND - 1))
 src=${1}
 dest=${2:-/media/usb}
 
+if [ -n "$check_syslinux" ]; then
+	destdir="$check_syslinux"
+	check_syslinux
+	exit 0
+fi
 
 [ -z "$src" ] && usage
 
@@ -235,13 +322,8 @@ elif [ -n "$srcurl" ]; then
 fi
 
 # find where new syslinux.cfg is
-for i in boot/syslinux/syslinux.cfg syslinux.cfg; do
-	if [ -e "$destdir"/.new/$i ]; then
-		syslinux_cfg=$i
-		vecho "Found $syslinux_cfg"
-		break
-	fi
-done
+find_syslinux_cfg "$destdir"/.new
+
 # abort early in case unexpected trouble
 if [ -z "$syslinux_cfg" ]; then
 	die "Could not find any syslinux.cfg on new iso?"
@@ -288,6 +370,9 @@ if [ -n "$replace_alpine_dev" -o -z "$upgrade" ] && [ -n "$UUID" ]; then
 		"$destdir"/$syslinux_cfg
 fi
 
+# verify syslinux.cfg
+check_syslinux
+
 # cleanup
 [ -z "$keep_old" ] && rm -rf "$destdir"/.old "$destdir"/.new
 
-- 
2.4.5