[PATCH wayland] wayland-egl: Make symbol test fail on failure

[Daniel Stone]

The previous rewrite of the wayland-egl ABI checker introduced checks
for removed symbols as well as added symbols, but broke some failure
conditions. Add an explict return-code variable set in failure paths,
rather than chaining or conditions.

If we cannot find the binary or nm, we regard this as an error
condition, rather than test failure.

v2: Don't test if we can execute $NM.

Signed-off-by: Daniel Stone <daniels at collabora.com>
Reported-by: Pekka Paalanen <pekka.paalanen at collabora.co.uk>
Fixes: 21b1f22eb056 ("wayland-egl: enhance the symbol test")
Cc: Emil Velikov <emil.velikov at collabora.com>
---
 egl/wayland-egl-symbols-check | 27 +++++++++++++++++++++------
 1 file changed, 21 insertions(+), 6 deletions(-)

diff --git a/egl/wayland-egl-symbols-check b/egl/wayland-egl-symbols-check
index c47026b2..70fe1f4c 100755
--- a/egl/wayland-egl-symbols-check
+++ b/egl/wayland-egl-symbols-check
@@ -1,11 +1,17 @@
 #!/bin/sh
 set -eu
 
+RET=0
 LIB=${WAYLAND_EGL_LIB}
 
-if [ ! -f "$LIB" ]; then
-	echo "The test binary \"$LIB\" does no exist"
-	exit 1
+if ! test -f "$LIB"; then
+	echo "Test binary \"$LIB\" does not exist"
+	exit 99
+fi
+
+if ! test -n "$NM"; then
+	echo "nm environment variable not set"
+	exit 99
 fi
 
 AVAIL_FUNCS="$($NM -D --format=bsd --defined-only $LIB | awk '{print $3}')"
@@ -32,7 +38,11 @@ NEW_ABI=$(echo "$AVAIL_FUNCS" | while read func; do
     echo $func
 done)
 
-test ! -n "$NEW_ABI" || echo "New ABI detected - If intentional, update the test."; echo "$NEW_ABI"
+if test -n "$NEW_ABI"; then
+	echo "New ABI detected - If intentional, update the test."
+	echo "$NEW_ABI"
+	RET=1
+fi
 
 REMOVED_ABI=$(echo "$REQ_FUNCS" | while read func; do
     echo "$AVAIL_FUNCS" | grep -q "^$func$" && continue
@@ -40,5 +50,10 @@ REMOVED_ABI=$(echo "$REQ_FUNCS" | while read func; do
     echo $func
 done)
 
-test ! -n "$REMOVED_ABI" || echo "ABI break detected - Required symbol(s) no longer exported!"; echo "$REMOVED_ABI"
-test ! -n "$NEW_ABI" || test ! -n "$REMOVED_ABI"
+if test -n "$REMOVED_ABI"; then
+	echo "ABI break detected - Required symbol(s) no longer exported!"
+	echo "$REMOVED_ABI"
+	RET=1
+fi
+
+exit $RET
-- 
2.16.2