Add script for importing bits-and-pieces to Git.

[git.git] / exec_cmd.c

diff --git a/exec_cmd.c b/exec_cmd.c
index 351fec2e9e374eacaeba88d2a7dddf11f5e331ce..408e4e55e1c58931444c772d35d23b505bf3e2ea 100644 (file)
--- a/exec_cmd.c
+++ b/exec_cmd.c
@@ -9,17 +9,53 @@ static const char *argv0_path;
 
 const char *system_path(const char *path)
 {
-       if (!is_absolute_path(path) && argv0_path) {
-               struct strbuf d = STRBUF_INIT;
-               strbuf_addf(&d, "%s/%s", argv0_path, path);
-               path = strbuf_detach(&d, NULL);
+#ifdef RUNTIME_PREFIX
+       static const char *prefix;
+#else
+       static const char *prefix = PREFIX;
+#endif
+       struct strbuf d = STRBUF_INIT;
+
+       if (is_absolute_path(path))
+               return path;
+
+#ifdef RUNTIME_PREFIX
+       assert(argv0_path);
+       assert(is_absolute_path(argv0_path));
+
+       if (!prefix &&
+           !(prefix = strip_path_suffix(argv0_path, GIT_EXEC_PATH)) &&
+           !(prefix = strip_path_suffix(argv0_path, BINDIR)) &&
+           !(prefix = strip_path_suffix(argv0_path, "git"))) {
+               prefix = PREFIX;
+               fprintf(stderr, "RUNTIME_PREFIX requested, "
+                               "but prefix computation failed.  "
+                               "Using static fallback '%s'.\n", prefix);
        }
+#endif
+
+       strbuf_addf(&d, "%s/%s", prefix, path);
+       path = strbuf_detach(&d, NULL);
        return path;
 }
 
-void git_set_argv0_path(const char *path)
+const char *git_extract_argv0_path(const char *argv0)
 {
-       argv0_path = path;
+       const char *slash;
+
+       if (!argv0 || !*argv0)
+               return NULL;
+       slash = argv0 + strlen(argv0);
+
+       while (argv0 <= slash && !is_dir_sep(*slash))
+               slash--;
+
+       if (slash >= argv0) {
+               argv0_path = xstrndup(argv0, slash - argv0);
+               return slash + 1;
+       }
+
+       return argv0;
 }
 
 void git_set_argv_exec_path(const char *exec_path)
@@ -65,9 +101,7 @@ void setup_path(void)
        const char *old_path = getenv("PATH");
        struct strbuf new_path = STRBUF_INIT;
 
-       add_path(&new_path, argv_exec_path);
-       add_path(&new_path, getenv(EXEC_PATH_ENVIRONMENT));
-       add_path(&new_path, system_path(GIT_EXEC_PATH));
+       add_path(&new_path, git_exec_path());
        add_path(&new_path, argv0_path);
 
        if (old_path)