Set the parallel HTTP request limit via an environment variable

[git.git] / refs.c

diff --git a/refs.c b/refs.c
index 6aa6aec..5a8cbd4 100644 (file)
--- a/refs.c
+++ b/refs.c
@@ -7,6 +7,50 @@
 /* We allow "recursive" symbolic refs. Only within reason, though */
 #define MAXDEPTH 5
 
+#ifndef USE_SYMLINK_HEAD
+#define USE_SYMLINK_HEAD 1
+#endif
+
+int validate_symref(const char *path)
+{
+       struct stat st;
+       char *buf, buffer[256];
+       int len, fd;
+
+       if (lstat(path, &st) < 0)
+               return -1;
+
+       /* Make sure it is a "refs/.." symlink */
+       if (S_ISLNK(st.st_mode)) {
+               len = readlink(path, buffer, sizeof(buffer)-1);
+               if (len >= 5 && !memcmp("refs/", buffer, 5))
+                       return 0;
+               return -1;
+       }
+
+       /*
+        * Anything else, just open it and try to see if it is a symbolic ref.
+        */
+       fd = open(path, O_RDONLY);
+       if (fd < 0)
+               return -1;
+       len = read(fd, buffer, sizeof(buffer)-1);
+       close(fd);
+
+       /*
+        * Is it a symbolic ref?
+        */
+       if (len < 4 || memcmp("ref:", buffer, 4))
+               return -1;
+       buf = buffer + 4;
+       len -= 4;
+       while (len && isspace(*buf))
+               buf++, len--;
+       if (len >= 5 && !memcmp("refs/", buf, 5))
+               return 0;
+       return -1;
+}
+
 const char *resolve_ref(const char *path, unsigned char *sha1, int reading)
 {
        int depth = MAXDEPTH, len;
@@ -71,6 +115,39 @@ const char *resolve_ref(const char *path, unsigned char *sha1, int reading)
        return path;
 }
 
+int create_symref(const char *git_HEAD, const char *refs_heads_master)
+{
+#if USE_SYMLINK_HEAD
+       unlink(git_HEAD);
+       return symlink(refs_heads_master, git_HEAD);
+#else
+       const char *lockpath;
+       char ref[1000];
+       int fd, len, written;
+
+       len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master);
+       if (sizeof(ref) <= len) {
+               error("refname too long: %s", refs_heads_master);
+               return -1;
+       }
+       lockpath = mkpath("%s.lock", git_HEAD);
+       fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666); 
+       written = write(fd, ref, len);
+       close(fd);
+       if (written != len) {
+               unlink(lockpath);
+               error("Unable to write to %s", lockpath);
+               return -2;
+       }
+       if (rename(lockpath, git_HEAD) < 0) {
+               unlink(lockpath);
+               error("Unable to create %s", git_HEAD);
+               return -3;
+       }
+       return 0;
+#endif
+}
+
 int read_ref(const char *filename, unsigned char *sha1)
 {
        if (resolve_ref(filename, sha1, 1))