git-fetch-pack: Do not use git-rev-list

[git.git] / refs.c

diff --git a/refs.c b/refs.c
index 2aac90c..97506a4 100644 (file)
--- a/refs.c
+++ b/refs.c
@@ -2,7 +2,6 @@
 #include "cache.h"
 
 #include <errno.h>
-#include <ctype.h>
 
 /* We allow "recursive" symbolic refs. Only within reason, though */
 #define MAXDEPTH 5
@@ -46,7 +45,7 @@ int validate_symref(const char *path)
        len -= 4;
        while (len && isspace(*buf))
                buf++, len--;
-       if (len >= 5 && !memcmp("refs/", buffer, 5))
+       if (len >= 5 && !memcmp("refs/", buf, 5))
                return 0;
        return -1;
 }
@@ -335,17 +334,54 @@ int write_ref_sha1(const char *ref, int fd, const unsigned char *sha1)
        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)