travis-ci: record and skip successfully built trees

diff --git a/exec_cmd.c b/exec_cmd.c
index 19ac2146d0c49be8f5ef3739664dc3105544b4c2..fb94aeba9cef2893ea7173e5634640e596659474 100644 (file)
--- a/exec_cmd.c
+++ b/exec_cmd.c
@@ -64,17 +64,19 @@ 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)