Turn the flags in struct dir_struct into a single variable

diff --git a/exec_cmd.c b/exec_cmd.c
index 0f8f4b5b7d9dea4458b9944dd81cf98c2e9a1322..f234066defd637dc3c048ba3d9eb43f1ecbad446 100644 (file)
--- a/exec_cmd.c
+++ b/exec_cmd.c
@@ -4,8 +4,84 @@
 #define MAX_ARGS       32
 
 extern char **environ;
-static const char *builtin_exec_path = GIT_EXEC_PATH;
 static const char *argv_exec_path;
+static const char *argv0_path;
+
+const char *system_path(const char *path)
+{
+#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) {
+               const char *strip[] = {
+                       GIT_EXEC_PATH,
+                       BINDIR,
+                       0
+               };
+               const char **s;
+
+               for (s = strip; *s; s++) {
+                       const char *sargv = argv0_path + strlen(argv0_path);
+                       const char *ss = *s + strlen(*s);
+                       while (argv0_path < sargv && *s < ss
+                               && (*sargv == *ss ||
+                                   (is_dir_sep(*sargv) && is_dir_sep(*ss)))) {
+                               sargv--;
+                               ss--;
+                       }
+                       if (*s == ss) {
+                               struct strbuf d = STRBUF_INIT;
+                               /* We also skip the trailing directory separator. */
+                               assert(sargv - argv0_path - 1 >= 0);
+                               strbuf_add(&d, argv0_path, sargv - argv0_path - 1);
+                               prefix = strbuf_detach(&d, NULL);
+                               break;
+                       }
+               }
+       }
+
+       if (!prefix) {
+               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;
+}
+
+const char *git_extract_argv0_path(const char *argv0)
+{
+       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)
 {
@@ -26,7 +102,7 @@ const char *git_exec_path(void)
                return env;
        }
 
-       return builtin_exec_path;
+       return system_path(GIT_EXEC_PATH);
 }
 
 static void add_path(struct strbuf *out, const char *path)
@@ -35,23 +111,19 @@ static void add_path(struct strbuf *out, const char *path)
                if (is_absolute_path(path))
                        strbuf_addstr(out, path);
                else
-                       strbuf_addstr(out, make_absolute_path(path));
+                       strbuf_addstr(out, make_nonrelative_path(path));
 
-               strbuf_addch(out, ':');
+               strbuf_addch(out, PATH_SEP);
        }
 }
 
-void setup_path(const char *cmd_path)
+void setup_path(void)
 {
        const char *old_path = getenv("PATH");
-       struct strbuf new_path;
-
-       strbuf_init(&new_path, 0);
+       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, builtin_exec_path);
-       add_path(&new_path, cmd_path);
+       add_path(&new_path, git_exec_path());
+       add_path(&new_path, argv0_path);
 
        if (old_path)
                strbuf_addstr(&new_path, old_path);
@@ -63,7 +135,7 @@ void setup_path(const char *cmd_path)
        strbuf_release(&new_path);
 }
 
-int execv_git_cmd(const char **argv)
+const char **prepare_git_cmd(const char **argv)
 {
        int argc;
        const char **nargv;
@@ -76,6 +148,11 @@ int execv_git_cmd(const char **argv)
        for (argc = 0; argv[argc]; argc++)
                nargv[argc + 1] = argv[argc];
        nargv[argc + 1] = NULL;
+       return nargv;
+}
+
+int execv_git_cmd(const char **argv) {
+       const char **nargv = prepare_git_cmd(argv);
        trace_argv_printf(nargv, "trace: exec:");
 
        /* execvp() can only ever return if it fails */