minitramfs: find/cpio exit codes ignored while building initramfs

The final stage of mkinitramfs that builds the image does not verify the
exit codes of find or cpio:

(cd "${DESTDIR}" && find . | cpio --quiet --dereference -o -H newc | gzip
>"${outfile}") || exit 1

Once bug 514936 is solved, this will be even more important, since cpio
will actually return errors.

Attached is a gross alternative to depending on bash...

Current behavior:

$ find /fail | cpio --quiet --dereference -o -H newc | gzip > /tmp/archive.gz
find: `/fail': No such file or directory
$ echo $?
0

Desired behavior:

$ set -o pipefail
$ find /fail | cpio --quiet --dereference -o -H newc | gzip > /tmp/archive.gz
find: `/fail': No such file or directory
$ echo $?
1


(closes: #514938)

[ already useful in finding stupid mkinitramfs path errors -maks ]

1 files changed, 18 insertions, 1 deletions

diff --git a/mkinitramfs b/mkinitramfs
index 70ff0fe..0aa2ba7 100755
--- a/mkinitramfs
+++ b/mkinitramfs
@@ -266,7 +266,24 @@ if [ -e "${CONFDIR}/DSDT.aml" ]; then
 fi
 
 [ "${verbose}" = y ] && echo "Building cpio ${outfile} initramfs"
-(cd "${DESTDIR}" && find . | cpio --quiet --dereference -o -H newc | gzip >"${outfile}") || exit 1
+(
+# work around lack of "set -o pipefail" for the following pipe:
+# cd "${DESTDIR}" && find . | cpio --quiet --dereference -o -H newc | gzip >"${outfile}"
+exec 3>&1
+eval `
+    # http://cfaj.freeshell.org/shell/cus-faq-2.html
+    exec 4>&1 >&3 3>&-
+    {
+        cd "${DESTDIR}" && find . 4>&-; echo "ec1=$?;" >&4
+    } | {
+        cpio --quiet --dereference -o -H newc 4>&-; echo "ec2=$?;" >&4
+    } | gzip >"${outfile}"
+    echo "ec3=$?;" >&4
+`
+if [ "$ec1" -ne 0 ]; then exit "$ec1"; fi
+if [ "$ec2" -ne 0 ]; then exit "$ec2"; fi
+if [ "$ec3" -ne 0 ]; then exit "$ec3"; fi
+) || exit $?
 
 if [ -s "${__TMPCPIOGZ}" ]; then
 	cat "${__TMPCPIOGZ}" >>"${outfile}" || exit 1