[PATCH openbmc 7/7] initfs: update: add check for image size vs mtd size

[OpenBMC Patches]

From: "Milton D. Miller II" <miltonm at us.ibm.com>

The flashcp command will check the file size vs the partition size,
so add a check when looking at images.

Use stat -L -c "%s" to get the file size, and compare it to the mtd
size from the sysfs size attribute.

If this check is suppressed the enforcement is left to flashcp.

Signed-off-by: Milton Miller <miltonm at us.ibm.com>
---
 .../obmc-phosphor-initfs/files/obmc-update.sh           | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/meta-phosphor/common/recipes-phosphor/obmc-phosphor-initfs/files/obmc-update.sh b/meta-phosphor/common/recipes-phosphor/obmc-phosphor-initfs/files/obmc-update.sh
index f444040..e5ce426 100755
--- a/meta-phosphor/common/recipes-phosphor/obmc-phosphor-initfs/files/obmc-update.sh
+++ b/meta-phosphor/common/recipes-phosphor/obmc-phosphor-initfs/files/obmc-update.sh
@@ -48,6 +48,14 @@ childmtds() {
 	done
 }
 
+toobig() {
+	if $(stat -L -c "%s" "$1") -gt $(cat /sys/class/mtd/"$2"/size)
+	then
+		return 0
+	fi
+	return 1
+}
+
 findmtd() {
 	m=$(grep -xl "$1" /sys/class/mtd/*/name)
 	m=${m%/name}
@@ -85,6 +93,7 @@ doclean=
 dosave=y
 dorestore=y
 toram=
+checksize=y
 checkmount=y
 
 whitelist=/run/initramfs/whitelist.d/
@@ -114,6 +123,9 @@ do
 	--no-flash)
 		doflash=
 		shift ;;
+	--ignore-size)
+		checksize=
+		shift ;;
 	--ignore-mount)
 		checkmount=
 		doflash=
@@ -163,6 +175,11 @@ do
 		echo 1>&2  "Unable to find mtd partiton for ${f##*/}."
 		exit 1
 	fi
+	if test -n "$checksize" && toobig "$f" "$m"
+	then
+		echo 1>&1 "Image ${f##*/} too big for $m."
+		exit 1
+	fi
 	for s in $m $(childmtds $m)
 	do
 		if test -n "$checkmount" && mtdismounted $s
-- 
2.8.3