[PATCH] wrap-for-bin.sh: facilitate running Git executables under valgrind

[Antonio Ospite <ao2@ao2.it>]

Testing locally built git executables under valgrind is not immediate.

Something like the following does not work:

  $ valgrind ./bin-wrappers/git

because the wrapper script forks and execs the command and valgrind does
not track children processes by default.

Something like the following may work:

  $ valgrind --trace-children=yes ./bin-wrappers/git

However it's counterintuitive and not ideal anyways because valgrind is
supposed to be called on the actual executable, not on wrapper scripts.

So, following the idea from commit 6a94088cc ("test: facilitate
debugging Git executables in tests with gdb", 2015-10-30) provide
a mechanism in the wrapper script to call valgrind directly on the
actual executable.

This mechanism could even be used by the test infrastructure in the
future, but it is already useful by its own on the command line:

  $ GIT_TEST_VALGRIND=1 \
    GIT_VALGRIND_OPTIONS="--leak-check=full" \
    ./bin-wrappers/git

Signed-off-by: Antonio Ospite <ao2@ao2.it>
---
 wrap-for-bin.sh | 4 ++++
 1 file changed, 4 insertions(+)
 mode change 100644 => 100755 wrap-for-bin.sh

diff --git a/wrap-for-bin.sh b/wrap-for-bin.sh
old mode 100644
new mode 100755
index 584240881..502d567bd
--- a/wrap-for-bin.sh
+++ b/wrap-for-bin.sh
@@ -24,6 +24,10 @@ if test -n "$GIT_TEST_GDB"
 then
 	unset GIT_TEST_GDB
 	exec gdb --args "${GIT_EXEC_PATH}/@@PROG@@" "$@"
+elif test -n "$GIT_TEST_VALGRIND"
+then
+	unset GIT_TEST_VALGRIND
+	exec valgrind $GIT_VALGRIND_OPTIONS "${GIT_EXEC_PATH}/@@PROG@@" "$@"
 else
 	exec "${GIT_EXEC_PATH}/@@PROG@@" "$@"
 fi
-- 
2.17.0