update-rc.d: check also that symlinks are valid

Running:

update-rc.d -r /path/to/target/rootfs basename defaults

at do_rootfs time in package postinstall stage, when
/path/to/target/rootfs/etc/init.d/basename is a symlink and points to some path
on target (for example: /etc/init.d/basename.some_package), would fail and the
postinstall execution would be postponed for first boot, on target.

This patch adds the posibility to verify whether the file the symlink
points to actually exists in the target rootfs.

[YOCTO #3716]

(From OE-Core rev: 4b63e73422ea25aba1bde0beddb02bc04948e13c)

Signed-off-by: Laurentiu Palcu <laurentiu.palcu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 57 insertions, 2 deletions

diff --git a/meta/recipes-core/update-rc.d/update-rc.d/check-if-symlinks-are-valid.patch b/meta/recipes-core/update-rc.d/update-rc.d/check-if-symlinks-are-valid.patch
new file mode 100644
index 0000000000..4476e9101d
--- /dev/null
+++ b/meta/recipes-core/update-rc.d/update-rc.d/check-if-symlinks-are-valid.patch
@@ -0,0 +1,53 @@
+Check if symlinks are valid
+
+When using root option and $initd/$bn is a symlink, the script would fail because
+the symlink points to a path on target. For example:
+
+/path/to/target/rootfs/etc/init.d/syslog -> /etc/init.d/syslog.busybox
+
+Hence, [ -f /path/to/target/rootfs/etc/init.d/syslog ] condition would return
+false.
+
+This patch adds the posibility to check whether the file the symlink points to
+actually exists in rootfs path and then continue.
+
+Upstream-Status: Pending
+
+Signed-off-by: Laurentiu Palcu <laurentiu.palcu@intel.com> 
+
+Index: git/update-rc.d
+===================================================================
+--- git.orig/update-rc.d        2013-01-16 12:12:58.349814356 +0200
++++ git/update-rc.d     2013-01-16 13:02:42.490864939 +0200
+@@ -147,13 +147,29 @@
+ bn=$1
+ shift
+ 
++sn=$initd/$bn
++if [ -L "$sn" -a -n $root ]; then
++       readlink=$(which readlink)
++
++       if [ -n $readlink ]; then
++               sn=$($readlink "$sn")
++               case "$sn" in
++                       /*) sn=${root}${sn} ;;
++                       *)  sn=$initd/$sn ;;
++               esac
++       else
++               echo "update-rc.d: readlink tool not present, cannot check whether \
++                               $sn symlink points to a valid file." >&2
++       fi
++fi
++
+ if [ $1 != "remove" ]; then
+-       if [ ! -f "$initd/$bn" ]; then
++       if [ ! -f "$sn" ]; then
+                echo "update-rc.d: $initd/$bn: file does not exist" >&2
+                exit 1
+        fi
+ else
+-       if [ -f "$initd/$bn" ]; then
++       if [ -f "$sn" ]; then
+                if [ $force -eq 1 ]; then
+                        echo "update-rc.d: $initd/$bn exists during rc.d purge (continuing)" >&2
+                else
diff --git a/meta/recipes-core/update-rc.d/update-rc.d_0.7.bb b/meta/recipes-core/update-rc.d/update-rc.d_0.7.bb
index 0aac5fa013..bfcbd97bcd 100644
--- a/meta/recipes-core/update-rc.d/update-rc.d_0.7.bb
+++ b/meta/recipes-core/update-rc.d/update-rc.d_0.7.bb
@@ -5,13 +5,15 @@ SECTION = "base"
 LICENSE = "GPLv2+"
 LIC_FILES_CHKSUM = "file://update-rc.d;beginline=5;endline=15;md5=148a48321b10eb37c1fa3ee02b940a75"
 
-PR = "r4"
+PR = "r5"
 
 # Revision corresponding to tag update-rc.d_0.7
 SRCREV = "eca680ddf28d024954895f59a241a622dd575c11"
 
 SRC_URI = "git://github.com/philb/update-rc.d.git;protocol=git \
-           file://add-verbose.patch;"
+           file://add-verbose.patch \
+           file://check-if-symlinks-are-valid.patch \
+          "
 
 S = "${WORKDIR}/git"