[V2,3/5] populate-volatile.sh: add ROOT_DIR variable to support running at rootfs time

Submitted by Qi.Chen@windriver.com on Feb. 20, 2013, 5:55 a.m.

Details

Message ID 00f09b8682acef05cefd94af79773929f3a0d3ee.1361338900.git.Qi.Chen@windriver.com
State Accepted
Commit 45396e3edcce4a33fcbef6456f31811f30c26c63
Headers show

Commit Message

Qi.Chen@windriver.com Feb. 20, 2013, 5:55 a.m.
From: Chen Qi <Qi.Chen@windriver.com>

For populate-volatile.sh script to run correctly both at rootfs time and
at system boot time, it needs to be aware of which situation it is now in.

We use the ROOT_DIR variable to indicate whether it is run at rootfs time or
not. ROOT_DIR being "/" indicates that this script is run at system boot time,
otherwise, it is run at rootfs time.

Also, we ignore failures when running this script at rootfs time.
For example, if ${ROOT_DIR}/var/dir1 is symlink to /var/volatile/dir1, it's
possible that the link is a dead link. So if we're going to create some file
under ${ROOT_DIR}/var/dir1, it will fail. But the failure does no harm,
because this script will always run at system boot time to set up the correct
files and directories.

[YOCTO #3406]

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
---
 .../initscripts-1.0/populate-volatile.sh           |   62 ++++++++++++++------
 1 file changed, 45 insertions(+), 17 deletions(-)

Patch hide | download patch | download mbox

diff --git a/meta/recipes-core/initscripts/initscripts-1.0/populate-volatile.sh b/meta/recipes-core/initscripts/initscripts-1.0/populate-volatile.sh
index ab3af70..c4bf70e 100755
--- a/meta/recipes-core/initscripts/initscripts-1.0/populate-volatile.sh
+++ b/meta/recipes-core/initscripts/initscripts-1.0/populate-volatile.sh
@@ -8,10 +8,18 @@ 
 # Short-Description:  Populate the volatile filesystem
 ### END INIT INFO
 
-. /etc/default/rcS
-
-CFGDIR="/etc/default/volatiles"
-TMPROOT="/var/tmp"
+# Get ROOT_DIR
+DIRNAME=`dirname $0`
+ROOT_DIR=`echo $DIRNAME | sed -ne 's:etc/.*::p'`
+
+[ -e ${ROOT_DIR}/etc/default/rcS ] && . ${ROOT_DIR}/etc/default/rcS
+# When running populate-volatile.sh at rootfs time, disable cache.
+[ "$ROOT_DIR" != "/" ] && VOLATILE_ENABLE_CACHE=no
+# If rootfs is read-only, disable cache.
+[ "$ROOTFS_READ_ONLY" = "yes" ] && VOLATILE_ENABLE_CACHE=no
+
+CFGDIR="${ROOT_DIR}/etc/default/volatiles"
+TMPROOT="${ROOT_DIR}/var/tmp"
 COREDEF="00_core"
 
 [ "${VERBOSE}" != "no" ] && echo "Populating volatile Filesystems."
@@ -27,7 +35,15 @@  create_file() {
 	[ -e "$1" ] && {
 		[ "${VERBOSE}" != "no" ] && echo "Target already exists. Skipping."
 	} || {
-		eval $EXEC &
+		if [ "$ROOT_DIR" = "/" ]; then
+			eval $EXEC &
+		else
+			# Creating some files at rootfs time may fail and should fail,
+			# but these failures should not be logged to make sure the do_rootfs
+			# process doesn't fail. This does no harm, as this script will
+			# run on target to set up the correct files and directories.
+			eval $EXEC > /dev/null 2>&1 &
+		fi
 	}
 }
 
@@ -41,7 +57,13 @@  mk_dir() {
 	[ -e "$1" ] && {
 		[ "${VERBOSE}" != "no" ] && echo "Target already exists. Skipping."
 	} || {
-		eval $EXEC
+		if [ "$ROOT_DIR" = "/" ]; then
+			eval $EXEC
+		else
+			# For the same reason with create_file(), failures should
+			# not be logged.
+			eval $EXEC > /dev/null 2>&1
+		fi
 	}
 }
 
@@ -49,11 +71,16 @@  link_file() {
 	EXEC="test -e \"$2\" -o -L $2 || ln -s \"$1\" \"$2\" >/dev/tty0 2>&1" 
 
 	test "$VOLATILE_ENABLE_CACHE" = yes && echo "	$EXEC" >> /etc/volatile.cache.build
-	
 	[ -e "$2" ] && {
 		echo "Cannot create link over existing -${TNAME}-." >&2
 	} || {
-		eval $EXEC &
+		if [ "$ROOT_DIR" = "/" ]; then
+			eval $EXEC &
+		else
+			# For the same reason with create_file(), failures should
+			# not be logged.
+			eval $EXEC > /dev/null 2>&1 &
+		fi
 	}
 }
 
@@ -63,7 +90,7 @@  check_requirements() {
 		rm "${TMP_DEFINED}"
 		rm "${TMP_COMBINED}"
 	}
-	
+
 	CFGFILE="$1"
 	[ `basename "${CFGFILE}"` = "${COREDEF}" ] && return 0
 
@@ -71,7 +98,7 @@  check_requirements() {
 	TMP_DEFINED="${TMPROOT}/tmpdefined.$$"
 	TMP_COMBINED="${TMPROOT}/tmpcombined.$$"
 
-	cat /etc/passwd | sed 's@\(^:\)*:.*@\1@' | sort | uniq > "${TMP_DEFINED}"
+	cat ${ROOT_DIR}/etc/passwd | sed 's@\(^:\)*:.*@\1@' | sort | uniq > "${TMP_DEFINED}"
 	cat ${CFGFILE} | grep -v "^#" | cut -d " " -f 2 > "${TMP_INTERMED}"
 	cat "${TMP_DEFINED}" "${TMP_INTERMED}" | sort | uniq > "${TMP_COMBINED}"
 	NR_DEFINED_USERS="`cat "${TMP_DEFINED}" | wc -l`"
@@ -85,7 +112,7 @@  check_requirements() {
 	}
 
 
-	cat /etc/group | sed 's@\(^:\)*:.*@\1@' | sort | uniq > "${TMP_DEFINED}"
+	cat ${ROOT_DIR}/etc/group | sed 's@\(^:\)*:.*@\1@' | sort | uniq > "${TMP_DEFINED}"
 	cat ${CFGFILE} | grep -v "^#" | cut -d " " -f 3 > "${TMP_INTERMED}"
 	cat "${TMP_DEFINED}" "${TMP_INTERMED}" | sort | uniq > "${TMP_COMBINED}"
 
@@ -116,6 +143,7 @@  apply_cfgfile() {
 	cat ${CFGFILE} | grep -v "^#" | \
 		while read LINE; do
 		eval `echo "$LINE" | sed -n "s/\(.*\)\ \(.*\) \(.*\)\ \(.*\)\ \(.*\)\ \(.*\)/TTYPE=\1 ; TUSER=\2; TGROUP=\3; TMODE=\4; TNAME=\5 TLTARGET=\6/p"`
+		TNAME=${ROOT_DIR}/${TNAME}
 		[ "${VERBOSE}" != "no" ] && echo "Checking for -${TNAME}-."
 
 		[ "${TTYPE}" = "l" ] && {
@@ -168,19 +196,19 @@  do
 done
 exec 9>&-
 
-if test -e /etc/volatile.cache -a "$VOLATILE_ENABLE_CACHE" = "yes" -a "x$1" != "xupdate" -a "x$clearcache" = "x0"
+if test -e ${ROOT_DIR}/etc/volatile.cache -a "$VOLATILE_ENABLE_CACHE" = "yes" -a "x$1" != "xupdate" -a "x$clearcache" = "x0"
 then
-	sh /etc/volatile.cache
-else	
-	rm -f /etc/volatile.cache /etc/volatile.cache.build
+	sh ${ROOT_DIR}/etc/volatile.cache
+else
+	rm -f ${ROOT_DIR}/etc/volatile.cache ${ROOT_DIR}/etc/volatile.cache.build
 	for file in `ls -1 "${CFGDIR}" | sort`; do
 		apply_cfgfile "${CFGDIR}/${file}"
 	done
 
-	[ -e /etc/volatile.cache.build ] && sync && mv /etc/volatile.cache.build /etc/volatile.cache
+	[ -e ${ROOT_DIR}/etc/volatile.cache.build ] && sync && mv ${ROOT_DIR}/etc/volatile.cache.build ${ROOT_DIR}/etc/volatile.cache
 fi
 
-if test -f /etc/ld.so.cache -a ! -f /var/run/ld.so.cache
+if [ "${ROOT_DIR}" = "/" ] && [ -f /etc/ld.so.cache ] && [ ! -f /var/run/ld.so.cache ]
 then
 	ln -s /etc/ld.so.cache /var/run/ld.so.cache
 fi