From 565a1631030e51661bf4bb5938244a9ff8972e1d Mon Sep 17 00:00:00 2001
From: Erez_Zadok <ezk@cs.sunysb.edu>
Date: Wed, 11 Jul 2007 21:57:00 -0400
Subject: [PATCH] support cramfs mounts

Somewhat complicated: we have to build the regular directory and file
hierarchy using ext2, then generate a cramfs image and loopback mount it,
and all inside the tests themselves.  So support for cramfs (and similar
special file systems) has to be built into the scaffold lower-level
routines.

Also: in the havechattr test, if "touch" on the branch failed, assume that
there's no chatter support (or that it can't be used, e.g., in a readonly
file system).

Finally, don't show stderr messages in havechattr.
---
 scaffold | 57 ++++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 53 insertions(+), 4 deletions(-)

diff --git a/scaffold b/scaffold
index a0e1318..4237282 100644
--- a/scaffold
+++ b/scaffold
@@ -22,17 +22,17 @@ function havechattr {
 	if [ ! -d $1 ] ; then
 		return 1
 	fi
-	touch $1/$FILE
-	if ! chattr +i $1/$FILE >/dev/null 2>&1 ; then
+	touch $1/$FILE 2> /dev/null || return 1
+	if ! chattr +i $1/$FILE > /dev/null 2>&1 ; then
 		rm -f $1/$FILE
 		return 1
 	fi
 	if (echo "Hello World" > $1/$FILE) >/dev/null 2>&1 ; then
-		chattr -i $1/$FILE >/dev/null 2>&1
+		chattr -i $1/$FILE > /dev/null 2>&1
 		rm -f $1/$FILE
 		return 1
 	fi
-	chattr -i $1/$FILE
+	chattr -i $1/$FILE > /dev/null 2>&1
 	rm -f $1/$FILE
 	return 0
 }
@@ -125,6 +125,44 @@ function create_hierarchy {
         done
 }
 
+function runcmd
+{
+    $@
+    sleep ${delay:-0.5}
+    ret=$?
+    if test $ret -ne 0 ; then exit $ret ; fi
+}
+
+# mount helper for compressed rom/ram file systems such as cramfs and
+# squashfs.
+export CRAMFS_BRANCHES
+function cramit {
+    CRAMFS_BRANCHES=""
+    fs=$1
+    shift
+    for n in "$@" ; do
+	case "$n" in
+	    *=ro )
+		dir=`echo $n | sed 's/=ro//g'`
+		i=`echo $n | tr -dc '[0-9]'`
+		dev=$(eval echo \$DEV$i)
+		echo -n "${fs}@${dev} "
+		tmpimg=/tmp/$fs.img.$i
+		runcmd mkfs -t $fs /n/lower/b$i $tmpimg
+		runcmd mount -t $fs -o loop $tmpimg /n/lower/b$i
+		CRAMFS_BRANCHES="$CRAMFS_BRANCHES $i"
+		;;
+	esac
+    done
+}
+
+# cleanup for compressed rom/ram file systems such as cramfs and squashfs.
+function uncramit {
+    for i in $CRAMFS_BRANCHES ; do
+	runcmd umount /n/lower/b$i
+    done
+}
+
 function check_hierarchy {
         ( find $1 -type d -printf 'd %p\n' ; find $1 -type f -printf 'f %p\n' ; find $1 -type b -printf 'b %p\n' ; find $1 -type c -printf 'c %p\n' ; find $1 -type l -printf 'l %p\n') | sort > /tmp/check-$$
         grep -v '^$' | sort | diff -u - /tmp/check-$$
@@ -134,6 +172,11 @@ function check_hierarchy {
 }
 
 function mount_union {
+	# support compressed ram/rom file systems
+	if test -n "$SPECIAL_FS" ; then
+	    cramit $SPECIAL_FS $*
+	fi
+
 	if [ "$MOUNTS" -gt 0 ] ; then
 		echo "There is already an outstanding mount!" 1>&2
 		exit 1
@@ -165,6 +208,12 @@ function mount_union {
 
 function unmount_union {
 	umount $MOUNTPOINT
+
+	# support compressed ram/rom file systems
+	if test -n "$CRAMFS_BRANCHES" ; then
+	    uncramit
+	fi
+
 	ERR=$?
 	if [ "$?" -eq "0" ] ; then
 		MOUNTS=$((MOUNTS - 1))
-- 
2.43.0