Fix up path-cleanup in git_path() properly

GIT_DIR=.  ends up being what some of the pack senders use, and we
sometimes messed up when cleaning up the path, ie a ".//HEAD" was
cleaned up into "/HEAD", not "HEAD" like it should be.

We should do some other cleanup, and probably also verify that symlinks
don't point to outside the git area.

diff --git a/sha1_file.c b/sha1_file.c
index 74dc2aa..bbb749c 100644 (file)
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -104,15 +104,13 @@ char *get_index_file(void)
 
 char *git_path(const char *fmt, ...)
 {
-       static char pathname[PATH_MAX];
+       static char pathname[PATH_MAX], *ret;
        va_list args;
        int len;
 
        if (!git_dir)
                setup_git_env();
        len = strlen(git_dir);
-       if (len == 1 && *git_dir == '.')
-               len = 0;
        if (len > PATH_MAX-100)
                return "pad-path";
        memcpy(pathname, git_dir, len);
@@ -121,7 +119,15 @@ char *git_path(const char *fmt, ...)
        va_start(args, fmt);
        vsnprintf(pathname + len, sizeof(pathname) - len, fmt, args);
        va_end(args);
-       return pathname;
+       ret = pathname;
+
+       /* Clean it up */
+       if (!memcmp(pathname, "./", 2)) {
+               ret += 2;
+               while (*ret == '/')
+                       ret++;
+       }
+       return ret;
 }
 
 int get_sha1(const char *str, unsigned char *sha1)