[PATCH openbmc 8/9] initfs: Add flash clear and update during init

[OpenBMC Patches]

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

Add code to clear the rwfs (preserving files from the whitelist)
during init, by a command line option.

Also allow it to be triggered by the file system not being a jffs2.

A console user can download images to /run/initramfs/ at the
debug-init-sh prompt for manual update.

Also add code but do not enable detecting images loaded into
initramfs / for future update options.  If enabled a custom initrd
with update images can be bulit (it would not fit in flash and
need to be netbooted).

Signed-off-by: Milton Miller <miltonm at us.ibm.com>
---
 .../obmc-phosphor-initfs/files/obmc-init.sh        | 54 +++++++++++++++++++++-
 1 file changed, 53 insertions(+), 1 deletion(-)

diff --git a/meta-phosphor/common/recipes-phosphor/obmc-phosphor-initfs/files/obmc-init.sh b/meta-phosphor/common/recipes-phosphor/obmc-phosphor-initfs/files/obmc-init.sh
index f2fe938..12c5a2f 100644
--- a/meta-phosphor/common/recipes-phosphor/obmc-phosphor-initfs/files/obmc-init.sh
+++ b/meta-phosphor/common/recipes-phosphor/obmc-phosphor-initfs/files/obmc-init.sh
@@ -85,13 +85,21 @@ rwfs=$(findmtd rwfs)
 rodev=/dev/mtdblock${rofs#mtd}
 rwdev=/dev/mtdblock${rwfs#mtd}
 
+# Set to y for yes, anything else for no.
+force_rwfst_jffs2=y
+flash_images_before_init=n
+
 rofst=squashfs
 rwfst=$(probe_fs_type $rwdev)
 roopts=ro
 rwopts=rw
 
+image=/run/initramfs/image-
+trigger=${image}rwfs
+
 init=/sbin/init
-fsck=/sbin/fsck.$rwfst
+fsckbase=/sbin/fsck.
+fsck=$fsckbase$rwfst
 fsckopts=-a
 
 echo rofs = $rofs $rofst   rwfs = $rwfs $rwfst
@@ -101,6 +109,50 @@ then
 	debug_takeover "Debug initial shell requested by command line."
 fi
 
+# If there are images in root move them to run/initramfs/ now.
+imagebasename=${image##*/}
+if test -n "${imagebasename}" -a "x$flash_images_before_init" = xy &&
+	ls /${imagebasename}* > /dev/null 2>&1
+then
+	echo "Pending flash updates found."
+	mv /${imagebasename}* ${image%$imagebasename}
+fi
+
+if grep -w clean-rwfs-filesystem /proc/cmdline
+then
+	echo "Cleaning of read-write overlay filesystem requested."
+	touch $trigger
+fi
+
+if test "x$force_rwfst_jffs2" = xy -a $rwfst != jffs2 -a ! -f $trigger
+then
+	echo "Converting read-write overlay filesystem to jffs2 forced."
+	touch $trigger
+fi
+
+if ls $image* > /dev/null 2>&1
+then
+	if ! test -x /update
+	then
+		debug_takeover "Flash update requested but /update missing!"
+	elif test -f $trigger -a ! -s $trigger
+	then
+		echo "Saving selected files from read-write overlay filesystem."
+		/update && rm -f $image*
+		echo "Clearing read-write overlay filesystem."
+		flash_eraseall /dev/$rwfs
+		echo "Restoring saved files to read-write overlay filesystem."
+		touch $trigger
+		/update 
+		rm -rf /save $trigger
+	else
+		/update && rm -f $image*
+	fi
+
+	rwfst=$(probe_fs_type $rwdev)
+	fsck=$fsckbase$rwfst
+fi
+
 mount $rodev $rodir -t $rofst -o $roopts
 
 if test -x $rodir$fsck
-- 
2.7.1