From 8dba1e634af1d973a47fca616a63e7062a256790 Mon Sep 17 00:00:00 2001
From: Jeff King <peff@peff.net>
Date: Wed, 30 Dec 2009 05:53:16 -0500
Subject: [PATCH] run-command: add "use shell" option

Many callsites run "sh -c $CMD" to run $CMD. We can make it
a little simpler for them by factoring out the munging of
argv.

For simple cases with no arguments, this doesn't help much, but:

  1. For cases with arguments, we save the caller from
     having to build the appropriate shell snippet.

  2. We can later optimize to avoid the shell when
     there are no metacharacters in the program.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 run-command.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 run-command.h |  2 ++
 2 files changed, 49 insertions(+)

diff --git a/run-command.c b/run-command.c
index cf2d8f7fae..b2bdcfda3d 100644
--- a/run-command.c
+++ b/run-command.c
@@ -15,6 +15,48 @@ static inline void dup_devnull(int to)
 	close(fd);
 }
 
+static const char **prepare_shell_cmd(const char **argv)
+{
+	int argc, nargc = 0;
+	const char **nargv;
+
+	for (argc = 0; argv[argc]; argc++)
+		; /* just counting */
+	/* +1 for NULL, +3 for "sh -c" plus extra $0 */
+	nargv = xmalloc(sizeof(*nargv) * (argc + 1 + 3));
+
+	if (argc < 1)
+		die("BUG: shell command is empty");
+
+	nargv[nargc++] = "sh";
+	nargv[nargc++] = "-c";
+
+	if (argc < 2)
+		nargv[nargc++] = argv[0];
+	else {
+		struct strbuf arg0 = STRBUF_INIT;
+		strbuf_addf(&arg0, "%s \"$@\"", argv[0]);
+		nargv[nargc++] = strbuf_detach(&arg0, NULL);
+	}
+
+	for (argc = 0; argv[argc]; argc++)
+		nargv[nargc++] = argv[argc];
+	nargv[nargc] = NULL;
+
+	return nargv;
+}
+
+#ifndef WIN32
+static int execv_shell_cmd(const char **argv)
+{
+	const char **nargv = prepare_shell_cmd(argv);
+	trace_argv_printf(nargv, "trace: exec:");
+	execvp(nargv[0], (char **)nargv);
+	free(nargv);
+	return -1;
+}
+#endif
+
 int start_command(struct child_process *cmd)
 {
 	int need_in, need_out, need_err;
@@ -123,6 +165,8 @@ int start_command(struct child_process *cmd)
 			cmd->preexec_cb();
 		if (cmd->git_cmd) {
 			execv_git_cmd(cmd->argv);
+		} else if (cmd->use_shell) {
+			execv_shell_cmd(cmd->argv);
 		} else {
 			execvp(cmd->argv[0], (char *const*) cmd->argv);
 		}
@@ -179,6 +223,8 @@ int start_command(struct child_process *cmd)
 
 	if (cmd->git_cmd) {
 		cmd->argv = prepare_git_cmd(cmd->argv);
+	} else if (cmd->use_shell) {
+		cmd->argv = prepare_shell_cmd(cmd->argv);
 	}
 
 	cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, env);
@@ -297,6 +343,7 @@ static void prepare_run_command_v_opt(struct child_process *cmd,
 	cmd->git_cmd = opt & RUN_GIT_CMD ? 1 : 0;
 	cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
 	cmd->silent_exec_failure = opt & RUN_SILENT_EXEC_FAILURE ? 1 : 0;
+	cmd->use_shell = opt & RUN_USING_SHELL ? 1 : 0;
 }
 
 int run_command_v_opt(const char **argv, int opt)
diff --git a/run-command.h b/run-command.h
index fb342090e3..967ba8cc09 100644
--- a/run-command.h
+++ b/run-command.h
@@ -33,6 +33,7 @@ struct child_process {
 	unsigned git_cmd:1; /* if this is to be git sub-command */
 	unsigned silent_exec_failure:1;
 	unsigned stdout_to_stderr:1;
+	unsigned use_shell:1;
 	void (*preexec_cb)(void);
 };
 
@@ -46,6 +47,7 @@ extern int run_hook(const char *index_file, const char *name, ...);
 #define RUN_GIT_CMD	     2	/*If this is to be git sub-command */
 #define RUN_COMMAND_STDOUT_TO_STDERR 4
 #define RUN_SILENT_EXEC_FAILURE 8
+#define RUN_USING_SHELL 16
 int run_command_v_opt(const char **argv, int opt);
 
 /*