fsck: avoid looking at NULL blob->object

diff --git a/exec_cmd.c b/exec_cmd.c
index 19ac2146d0c49be8f5ef3739664dc3105544b4c2..ce192a2d64c846e9d7ccffe10c9476f9c5abb8b8 100644 (file)
--- a/exec_cmd.c
+++ b/exec_cmd.c
@@ -5,21 +5,14 @@
 #define MAX_ARGS       32
 
 static const char *argv_exec_path;
+
+#ifdef RUNTIME_PREFIX
 static const char *argv0_path;
 
-char *system_path(const char *path)
+static const char *system_prefix(void)
 {
-#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 xstrdup(path);
 
-#ifdef RUNTIME_PREFIX
        assert(argv0_path);
        assert(is_absolute_path(argv0_path));
 
@@ -32,10 +25,7 @@ char *system_path(const char *path)
                                "but prefix computation failed.  "
                                "Using static fallback '%s'.\n", prefix);
        }
-#endif
-
-       strbuf_addf(&d, "%s/%s", prefix, path);
-       return strbuf_detach(&d, NULL);
+       return prefix;
 }
 
 void git_extract_argv0_path(const char *argv0)
@@ -51,6 +41,30 @@ void git_extract_argv0_path(const char *argv0)
                argv0_path = xstrndup(argv0, slash - argv0);
 }
 
+#else
+
+static const char *system_prefix(void)
+{
+       return PREFIX;
+}
+
+void git_extract_argv0_path(const char *argv0)
+{
+}
+
+#endif /* RUNTIME_PREFIX */
+
+char *system_path(const char *path)
+{
+       struct strbuf d = STRBUF_INIT;
+
+       if (is_absolute_path(path))
+               return xstrdup(path);
+
+       strbuf_addf(&d, "%s/%s", system_prefix(), path);
+       return strbuf_detach(&d, NULL);
+}
+
 void git_set_argv_exec_path(const char *exec_path)
 {
        argv_exec_path = exec_path;
@@ -64,17 +78,19 @@ void git_set_argv_exec_path(const char *exec_path)
 /* Returns the highest-priority, location to look for git programs. */
 const char *git_exec_path(void)
 {
-       const char *env;
+       static char *cached_exec_path;
 
        if (argv_exec_path)
                return argv_exec_path;
 
-       env = getenv(EXEC_PATH_ENVIRONMENT);
-       if (env && *env) {
-               return env;
+       if (!cached_exec_path) {
+               const char *env = getenv(EXEC_PATH_ENVIRONMENT);
+               if (env && *env)
+                       cached_exec_path = xstrdup(env);
+               else
+                       cached_exec_path = system_path(GIT_EXEC_PATH);
        }
-
-       return system_path(GIT_EXEC_PATH);
+       return cached_exec_path;
 }
 
 static void add_path(struct strbuf *out, const char *path)