git-fsck-cache: be stricter about "tree" objects

In particular, warn about things like zero-padding of the mode bits,
which is a big no-no, since it makes otherwise identical trees have
different representations (and thus different SHA1 numbers).

Also make the warnings more regular.

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

diff --git a/fsck-cache.c b/fsck-cache.c
index c660391..6115514 100644 (file)
--- a/fsck-cache.c
+++ b/fsck-cache.c
@@ -109,13 +109,19 @@ static int verify_ordered(struct tree_entry_list *a, struct tree_entry_list *b)
 
 static int fsck_tree(struct tree *item)
 {
+       int retval;
        int has_full_path = 0;
+       int has_zero_pad = 0;
+       int has_bad_modes = 0;
+       int has_dup_entries = 0;
+       int not_properly_sorted = 0;
        struct tree_entry_list *entry, *last;
 
        last = NULL;
        for (entry = item->entries; entry; entry = entry->next) {
                if (strchr(entry->name, '/'))
                        has_full_path = 1;
+               has_zero_pad |= entry->zeropad;
 
                switch (entry->mode) {
                /*
@@ -135,22 +141,17 @@ static int fsck_tree(struct tree *item)
                        if (!check_strict)
                                break;
                default:
-                       printf("tree %s has entry %o %s\n",
-                               sha1_to_hex(item->object.sha1),
-                               entry->mode, entry->name);
+                       has_bad_modes = 1;
                }
 
                if (last) {
                        switch (verify_ordered(last, entry)) {
                        case TREE_UNORDERED:
-                               fprintf(stderr, "tree %s not ordered\n",
-                                       sha1_to_hex(item->object.sha1));
-                               return -1;
+                               not_properly_sorted = 1;
+                               break;
                        case TREE_HAS_DUPS:
-                               fprintf(stderr, "tree %s has duplicate entries for '%s'\n",
-                                       sha1_to_hex(item->object.sha1),
-                                       entry->name);
-                               return -1;
+                               has_dup_entries = 1;
+                               break;
                        default:
                                break;
                        }
@@ -159,13 +160,35 @@ static int fsck_tree(struct tree *item)
                last = entry;
        }
 
+       retval = 0;
        if (has_full_path) {
                fprintf(stderr, "warning: git-fsck-cache: tree %s "
                        "has full pathnames in it\n", 
                        sha1_to_hex(item->object.sha1));
        }
-
-       return 0;
+       if (has_zero_pad) {
+               fprintf(stderr, "warning: git-fsck-cache: tree %s "
+                       "has zero-padded file modes in it\n",
+                       sha1_to_hex(item->object.sha1));
+       }
+       if (has_bad_modes) {
+               fprintf(stderr, "warning: git-fsck-cache: tree %s "
+                       "has bad file modes in it\n",
+                       sha1_to_hex(item->object.sha1));
+       }
+       if (has_dup_entries) {
+               fprintf(stderr, "error: git-fsck-cache: tree %s "
+                       "has duplicate file entries\n",
+                       sha1_to_hex(item->object.sha1));
+               retval = -1;
+       }
+       if (not_properly_sorted) {
+               fprintf(stderr, "error: git-fsck-cache: tree %s "
+                       "is not properly sorted\n",
+                       sha1_to_hex(item->object.sha1));
+               retval = -1;
+       }
+       return retval;
 }
 
 static int fsck_commit(struct commit *commit)

diff --git a/tree.c b/tree.c
index dabc2e7..8f490b8 100644 (file)
--- a/tree.c
+++ b/tree.c
@@ -167,6 +167,7 @@ int parse_tree_buffer(struct tree *item, void *buffer, unsigned long size)
                entry->directory = S_ISDIR(mode) != 0;
                entry->executable = (mode & S_IXUSR) != 0;
                entry->symlink = S_ISLNK(mode) != 0;
+               entry->zeropad = *(char *)bufptr == '0';
                entry->mode = mode;
                entry->next = NULL;
 

diff --git a/tree.h b/tree.h
index 74fe09d..ae61bcc 100644 (file)
--- a/tree.h
+++ b/tree.h
@@ -10,6 +10,7 @@ struct tree_entry_list {
        unsigned directory : 1;
        unsigned executable : 1;
        unsigned symlink : 1;
+       unsigned zeropad : 1;
        unsigned int mode;
        char *name;
        union {