initscripts: fix bashism in bootmisc.sh

In the commit 'initscripts: save /etc/timestamp with seconds accuracy',
a bashism was introduced in the bootmisc.sh script in the code to set
the current date from the stored value in /etc/timestamp.  This causes
that operation to fail with the following message when /bin/sh is not
bash:

/etc/init.d/rc: /etc/rcS.d/S55bootmisc.sh: line 73: syntax error: bad substitution

Fixed by using pattern matching removal rather than bash-specific
substring expansion.

[YOCTO #6566]

(From OE-Core rev: c8a451adc71e4ce9ab963f61d7830c2d75aaffca)

Signed-off-by: Ben Shelton <ben.shelton@ni.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/meta/recipes-core/initscripts/initscripts-1.0/bootmisc.sh b/meta/recipes-core/initscripts/initscripts-1.0/bootmisc.sh
index ccc7f9f1f4..df553bc079 100755
--- a/meta/recipes-core/initscripts/initscripts-1.0/bootmisc.sh
+++ b/meta/recipes-core/initscripts/initscripts-1.0/bootmisc.sh
@@ -70,7 +70,11 @@ then
         read TIMESTAMP < /etc/timestamp
         if [ ${TIMESTAMP} -gt $SYSTEMDATE ]; then
                 # format the timestamp as date expects it (2m2d2H2M4Y.2S)
-                date -u ${TIMESTAMP:4:8}${TIMESTAMP:0:4}.${TIMESTAMP:(-2)}
+                TS_YR=${TIMESTAMP%??????????}
+                TS_SEC=${TIMESTAMP#????????????}
+                TS_FIRST12=${TIMESTAMP%??}
+                TS_MIDDLE8=${TS_FIRST12#????}
+                date -u ${TS_MIDDLE8}${TS_YR}.${TS_SEC}
                 test -x /etc/init.d/hwclock.sh && /etc/init.d/hwclock.sh stop
         fi
 fi