[Buildroot] [PATCH] support/apply-patches: re-instate set -e

[Yann E. MORIN]

As reported by Sébastien Szymanski [1], the apply-patches script
doesn't stop if a tar command can't extract an archive.

Use "set -e" to exit immediately if a command return an error.

Be sure to ignore any expected error: when we check if a patch to be
applied has the same basename as an already applied patch, the grep
would fail when no such patch was already applied. We should not fail
in this case.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998 at free.fr>
Cc: Sébastien Szymanski <sebastien.szymanski at armadeus.com>
Cc: Romain Naour <romain.naour at openwide.fr>

---
Tested with:
    make defconfig
    make allyespackageconfig
    [remove luainterpreter to avoid multiple providers for
     luainterpreter; disable qemu-user; disable tar rootfs]
    make source
    make $(make -s show-targets |sed -r -e 's/ |$/-patch /g')
---
 support/scripts/apply-patches.sh | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/support/scripts/apply-patches.sh b/support/scripts/apply-patches.sh
index 694302d..7ccb39d 100755
--- a/support/scripts/apply-patches.sh
+++ b/support/scripts/apply-patches.sh
@@ -31,6 +31,8 @@
 # applied. The list of the patches applied is stored in '.applied_patches_list'
 # file in the build directory.
 
+set -e
+
 silent=
 if [ "$1" = "-s" ] ; then
     # add option to be used by the patch tool
@@ -103,7 +105,7 @@ function apply_patch {
         echo "Error: missing patch file ${path}/$patch"
         exit 1
     fi
-    existing="$(grep -E "/${patch}\$" ${builddir}/.applied_patches_list)"
+    existing="$(grep -E "/${patch}\$" ${builddir}/.applied_patches_list || true)"
     if [ -n "${existing}" ]; then
         echo "Error: duplicate filename '${patch}'"
         echo "Conflicting files are:"
-- 
2.7.4