Make 'fsck' able to take an arbitrary number of parents on the

command line.

"arbitrary" is a bit wrong, since it is limited by the argument
size limit (128kB or so), but let's see if anybody ever cares.
Arguably you should prune your tree before you have a few thousand
dangling heads in your archive.

We can fix it by passing in a file listing if we ever care.

diff --git a/fsck-cache.c b/fsck-cache.c
index 34c8081..e7014a0 100644 (file)
--- a/fsck-cache.c
+++ b/fsck-cache.c
@@ -19,7 +19,6 @@
 #define REACHABLE 0x40000
 
 static int show_unreachable = 0;
-static int head_supplied = 0;
 static unsigned char head_sha1[20];
 
 struct parent {
@@ -122,9 +121,6 @@ static void check_connectivity(void)
 {
        int i;
 
-       if (head_supplied)
-               mark_reachable(lookup_rev(head_sha1));
-
        /* Look up all the requirements, warn about missing objects.. */
        for (i = 0; i < nr_revs; i++) {
                struct revision *rev = revs[i];
@@ -282,29 +278,38 @@ static int fsck_dir(int i, char *path)
 
 int main(int argc, char **argv)
 {
-       int i;
+       int i, heads;
        char *sha1_dir;
 
+       sha1_dir = getenv(DB_ENVIRONMENT) ? : DEFAULT_DB_ENVIRONMENT;
+       for (i = 0; i < 256; i++) {
+               static char dir[4096];
+               sprintf(dir, "%s/%02x", sha1_dir, i);
+               fsck_dir(i, dir);
+       }
+
+       heads = 0;
        for (i = 1; i < argc; i++) {
                if (!strcmp(argv[i], "--unreachable")) {
                        show_unreachable = 1;
                        continue;
                }
                if (!get_sha1_hex(argv[i], head_sha1)) {
-                       head_supplied = 1;
+                       mark_reachable(lookup_rev(head_sha1));
+                       heads++;
                        continue;
                }
-               usage("fsck-cache [[--unreachable] <head-sha1>]");
+               error("fsck-cache [[--unreachable] <head-sha1>*]");
        }
-       if (show_unreachable && !head_supplied)
-               usage("unable to do reachability checks without a head");
 
-       sha1_dir = getenv(DB_ENVIRONMENT) ? : DEFAULT_DB_ENVIRONMENT;
-       for (i = 0; i < 256; i++) {
-               static char dir[4096];
-               sprintf(dir, "%s/%02x", sha1_dir, i);
-               fsck_dir(i, dir);
+       if (!heads) {
+               if (show_unreachable) {
+                       fprintf(stderr, "unable to do reachability without a head\n");
+                       show_unreachable = 0; 
+               }
+               fprintf(stderr, "expect dangling commits - potential heads - due to lack of head information\n");
        }
+
        check_connectivity();
        return 0;
 }