[PATCH] update-cache: add "--ignore-missing" option

This adds an --ignore-missing option to update-cache, which makes it
ignore missing files.  Together with the "-n" option to checkout-cache,
it allows me to do

    checkout-cache -n -f -a && update-cache --ignore-missing --refresh

which only updates and refreshes the files I already have checked out.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/update-cache.c b/update-cache.c
index 4353b80..02c213c 100644 (file)
--- a/update-cache.c
+++ b/update-cache.c
@@ -12,7 +12,23 @@
  * like "update-cache *" and suddenly having all the object
  * files be revision controlled.
  */
-static int allow_add = 0, allow_remove = 0;
+static int allow_add = 0, allow_remove = 0, not_new = 0;
+
+/* Three functions to allow overloaded pointer return; see linux/err.h */
+static inline void *ERR_PTR(long error)
+{
+       return (void *) error;
+}
+
+static inline long PTR_ERR(const void *ptr)
+{
+       return (long) ptr;
+}
+
+static inline long IS_ERR(const void *ptr)
+{
+       return (unsigned long)ptr > (unsigned long)-1000L;
+}
 
 static int index_fd(unsigned char *sha1, int fd, struct stat *st)
 {
@@ -172,7 +188,7 @@ static struct cache_entry *refresh_entry(struct cache_entry *ce)
        int changed, size;
 
        if (stat(ce->name, &st) < 0)
-               return NULL;
+               return ERR_PTR(-errno);
 
        changed = cache_match_stat(ce, &st);
        if (!changed)
@@ -183,10 +199,10 @@ static struct cache_entry *refresh_entry(struct cache_entry *ce)
         * to refresh the entry - it's not going to match
         */
        if (changed & MODE_CHANGED)
-               return NULL;
+               return ERR_PTR(-EINVAL);
 
        if (compare_data(ce, st.st_size))
-               return NULL;
+               return ERR_PTR(-EINVAL);
 
        size = ce_size(ce);
        updated = malloc(size);
@@ -212,8 +228,9 @@ static void refresh_cache(void)
                }
 
                new = refresh_entry(ce);
-               if (!new) {
-                       printf("%s: needs update\n", ce->name);
+               if (IS_ERR(new)) {
+                       if (!(not_new && PTR_ERR(new) == -ENOENT))
+                               printf("%s: needs update\n", ce->name);
                        continue;
                }
                active_cache[i] = new;
@@ -328,6 +345,10 @@ int main(int argc, char **argv)
                                i += 3;
                                continue;
                        }
+                       if (!strcmp(path, "--ignore-missing")) {
+                               not_new = 1;
+                               continue;
+                       }
                        die("unknown option %s", path);
                }
                if (!verify_path(path)) {