#include "cache.h"
#include <errno.h>
-#include <ctype.h>
/* 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;
return path;
}
+int create_symref(const char *git_HEAD, const char *refs_heads_master)
+{
+ const char *lockpath;
+ char ref[1000];
+ int fd, len, written;
+
+#if USE_SYMLINK_HEAD
+ 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 -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;
+}
+
int read_ref(const char *filename, unsigned char *sha1)
{
if (resolve_ref(filename, sha1, 1))
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 == ':');
+}
+
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)