1 files changed, 145 insertions, 0 deletions
diff --git a/exec_cmd.c b/exec_cmd.c
new file mode 100644
index 0000000000..da04efe951
--- /dev/null
+++ b/exec_cmd.c
@@ -0,0 +1,145 @@
+#include "cache.h"
+#include "exec_cmd.h"
+#include "quote.h"
+#define MAX_ARGS	32
+
+extern char **environ;
+static const char *argv_exec_path;
+
+static const char *builtin_exec_path(void)
+{
+#ifndef __MINGW32__
+	return GIT_EXEC_PATH;
+#else
+	int len;
+	char *p, *q, *sl;
+	static char *ep;
+	if (ep)
+		return ep;
+
+	len = strlen(_pgmptr);
+	if (len < 2)
+		return ep = ".";
+
+	p = ep = xmalloc(len+1);
+	q = _pgmptr;
+	sl = NULL;
+	/* copy program name, turn '\\' into '/', skip last part */
+	while ((*p = *q)) {
+		if (*q == '\\' || *q == '/') {
+			*p = '/';
+			sl = p;
+		}
+		p++, q++;
+	}
+	if (sl)
+		*sl = '\0';
+	else
+		ep[0] = '.', ep[1] = '\0';
+	return ep;
+#endif
+}
+
+void git_set_argv_exec_path(const char *exec_path)
+{
+	argv_exec_path = exec_path;
+}
+
+
+/* Returns the highest-priority, location to look for git programs. */
+const char *git_exec_path(void)
+{
+	const char *env;
+
+	if (argv_exec_path)
+		return argv_exec_path;
+
+	env = getenv(EXEC_PATH_ENVIRONMENT);
+	if (env && *env) {
+		return env;
+	}
+
+	return builtin_exec_path();
+}
+
+static void add_path(struct strbuf *out, const char *path)
+{
+	if (path && *path) {
+		if (is_absolute_path(path))
+			strbuf_addstr(out, path);
+		else
+			strbuf_addstr(out, make_absolute_path(path));
+
+		strbuf_addch(out, PATH_SEP);
+	}
+}
+
+void setup_path(const char *cmd_path)
+{
+	const char *old_path = getenv("PATH");
+	struct strbuf new_path;
+
+	strbuf_init(&new_path, 0);
+
+	add_path(&new_path, argv_exec_path);
+	add_path(&new_path, getenv(EXEC_PATH_ENVIRONMENT));
+	add_path(&new_path, builtin_exec_path());
+	add_path(&new_path, cmd_path);
+
+	if (old_path)
+		strbuf_addstr(&new_path, old_path);
+	else
+		strbuf_addstr(&new_path, "/usr/local/bin:/usr/bin:/bin");
+
+	setenv("PATH", new_path.buf, 1);
+
+	strbuf_release(&new_path);
+}
+
+int execv_git_cmd(const char **argv)
+{
+	int argc;
+	const char **nargv;
+
+	for (argc = 0; argv[argc]; argc++)
+		; /* just counting */
+	nargv = xmalloc(sizeof(*nargv) * (argc + 2));
+
+	nargv[0] = "git";
+	for (argc = 0; argv[argc]; argc++)
+		nargv[argc + 1] = argv[argc];
+	nargv[argc + 1] = NULL;
+	trace_argv_printf(nargv, "trace: exec:");
+
+	/* execvp() can only ever return if it fails */
+	execvp("git", (char **)nargv);
+
+	trace_printf("trace: exec failed: %s\n", strerror(errno));
+
+	free(nargv);
+	return -1;
+}
+
+
+int execl_git_cmd(const char *cmd,...)
+{
+	int argc;
+	const char *argv[MAX_ARGS + 1];
+	const char *arg;
+	va_list param;
+
+	va_start(param, cmd);
+	argv[0] = cmd;
+	argc = 1;
+	while (argc < MAX_ARGS) {
+		arg = argv[argc++] = va_arg(param, char *);
+		if (!arg)
+			break;
+	}
+	va_end(param);
+	if (MAX_ARGS <= argc)
+		return error("too many args to run %s", cmd);
+
+	argv[argc] = NULL;
+	return execv_git_cmd(argv);
+}