/* 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;
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;
+#ifdef USE_SYMLINK_HEAD
+ if (!only_use_symrefs) {
+ unlink(git_HEAD);
+ if (!symlink(refs_heads_master, git_HEAD))
+ return 0;
+ fprintf(stderr, "no symlink - falling back to symbolic ref\n");
+ }
+#endif
+
len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master);
if (sizeof(ref) <= len) {
error("refname too long: %s", refs_heads_master);
return -3;
}
return 0;
-#endif
}
int read_ref(const char *filename, unsigned char *sha1)
return -1;
filename = ref_file_name(ref);
lock_filename = ref_lock_file_name(ref);
+ if (safe_create_leading_directories(filename))
+ die("unable to create leading directory for %s", filename);
retval = write_ref_file(filename, lock_filename, fd, sha1);
free(filename);
free(lock_filename);
return retval;
}
+/*
+ * Make sure "ref" is something reasonable to have under ".git/refs/";
+ * We do not like it if:
+ *
+ * - any path component of it begins with ".", or
+ * - it has double dots "..", or
+ * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
+ * - it ends with a "/".
+ */
+
+static inline int bad_ref_char(int ch)
+{
+ return (((unsigned) ch) <= ' ' ||
+ ch == '~' || ch == '^' || ch == ':' ||
+ /* 2.13 Pattern Matching Notation */
+ ch == '?' || ch == '*' || ch == '[');
+}
+
int check_ref_format(const char *ref)
{
- char *middle;
- if (ref[0] == '.' || ref[0] == '/')
- return -1;
- middle = strchr(ref, '/');
- if (!middle || !middle[1])
- return -1;
- if (strchr(middle + 1, '/'))
- return -1;
- return 0;
+ int ch, level;
+ const char *cp = ref;
+
+ level = 0;
+ while (1) {
+ while ((ch = *cp++) == '/')
+ ; /* tolerate duplicated slashes */
+ if (!ch)
+ return -1; /* should not end with slashes */
+
+ /* we are at the beginning of the path component */
+ if (ch == '.' || bad_ref_char(ch))
+ return -1;
+
+ /* scan the rest of the path component */
+ while ((ch = *cp++) != 0) {
+ if (bad_ref_char(ch))
+ return -1;
+ if (ch == '/')
+ break;
+ if (ch == '.' && *cp == '.')
+ return -1;
+ }
+ level++;
+ if (!ch) {
+ if (level < 2)
+ return -1; /* at least of form "heads/blah" */
+ return 0;
+ }
+ }
}
int write_ref_sha1_unlocked(const char *ref, const unsigned char *sha1)
return -1;
filename = ref_file_name(ref);
lock_filename = ref_lock_file_name(ref);
+ if (safe_create_leading_directories(filename))
+ die("unable to create leading directory for %s", filename);
fd = open(lock_filename, O_WRONLY | O_CREAT | O_EXCL, 0666);
if (fd < 0) {
error("Writing %s", lock_filename);