Pass PID of git process to hooks.

Signed-off-by: Alejandro Pauly <alpauly@microsoft.com>

git.c

@@ -450,6 +450,7 @@ static int run_pre_command_hook(const char **argv)
 
 	/* call the hook proc */
 	strvec_pushv(&sargv, argv);
+	strvec_pushf(&sargv, "--git-pid=%"PRIuMAX, (uintmax_t)getpid());
 	strvec_pushv(&opt.args, sargv.v);
 	ret = run_hooks_opt("pre-command", &opt);
 

t/t0400-pre-command-hook.sh

@@ -13,7 +13,8 @@ test_expect_success 'with no hook' '
 test_expect_success 'with succeeding hook' '
 	mkdir -p .git/hooks &&
 	write_script .git/hooks/pre-command <<-EOF &&
-	echo "\$*" >\$(git rev-parse --git-dir)/pre-command.out
+	echo "\$*" | sed "s/ --git-pid=[0-9]*//" \
+		>\$(git rev-parse --git-dir)/pre-command.out
 	EOF
 	echo "second" >> file &&
 	git add file &&

t/t0401-post-command-hook.sh

@@ -13,7 +13,8 @@ test_expect_success 'with no hook' '
 test_expect_success 'with succeeding hook' '
 	mkdir -p .git/hooks &&
 	write_script .git/hooks/post-command <<-EOF &&
-	echo "\$*" >\$(git rev-parse --git-dir)/post-command.out
+	echo "\$*" | sed "s/ --git-pid=[0-9]*//" \
+		>\$(git rev-parse --git-dir)/post-command.out
 	EOF
 	echo "second" >> file &&
 	git add file &&