tree-walk: add a mechanism for getting non-canonicalized modes
When using init_tree_desc() and tree_entry() to iterate over a tree, we
always canonicalize the modes coming out of the tree. This is a good
thing to prevent bugs or oddities in normal code paths, but it's
counter-productive for tools like fsck that want to see the exact
contents.
We can address this by adding an option to avoid the extra
canonicalization. A few notes on the implementation:
- I've attached the new option to the tree_desc struct itself. The
actual code change is in decode_tree_entry(), which is in turn
called by the public update_tree_entry(), tree_entry(), and
init_tree_desc() functions, plus their "gently" counterparts.
By letting it ride along in the struct, we can avoid changing the
signature of those functions, which are called many times. Plus it's
conceptually simpler: you really want a particular iteration of a
tree to be "raw" or not, rather than individual calls.
- We still have to set the new option somewhere. The struct is
initialized by init_tree_desc(). I added the new flags field only to
the "gently" version. That avoids disturbing the much more numerous
non-gentle callers, and it makes sense that anybody being careful
about looking at raw modes would also be careful about bogus trees
(i.e., the caller will be something like fsck in the first place).
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/tree-walk.c b/tree-walk.c
index 506234b..74f4d71 100644
--- a/tree-walk.c
+++ b/tree-walk.c
@@ -47,17 +47,20 @@ static int decode_tree_entry(struct tree_desc *desc, const char *buf, unsigned l
/* Initialize the descriptor entry */
desc->entry.path = path;
- desc->entry.mode = canon_mode(mode);
+ desc->entry.mode = (desc->flags & TREE_DESC_RAW_MODES) ? mode : canon_mode(mode);
desc->entry.pathlen = len - 1;
oidread(&desc->entry.oid, (const unsigned char *)path + len);
return 0;
}
-static int init_tree_desc_internal(struct tree_desc *desc, const void *buffer, unsigned long size, struct strbuf *err)
+static int init_tree_desc_internal(struct tree_desc *desc, const void *buffer,
+ unsigned long size, struct strbuf *err,
+ enum tree_desc_flags flags)
{
desc->buffer = buffer;
desc->size = size;
+ desc->flags = flags;
if (size)
return decode_tree_entry(desc, buffer, size, err);
return 0;
@@ -66,15 +69,16 @@ static int init_tree_desc_internal(struct tree_desc *desc, const void *buffer, u
void init_tree_desc(struct tree_desc *desc, const void *buffer, unsigned long size)
{
struct strbuf err = STRBUF_INIT;
- if (init_tree_desc_internal(desc, buffer, size, &err))
+ if (init_tree_desc_internal(desc, buffer, size, &err, 0))
die("%s", err.buf);
strbuf_release(&err);
}
-int init_tree_desc_gently(struct tree_desc *desc, const void *buffer, unsigned long size)
+int init_tree_desc_gently(struct tree_desc *desc, const void *buffer, unsigned long size,
+ enum tree_desc_flags flags)
{
struct strbuf err = STRBUF_INIT;
- int result = init_tree_desc_internal(desc, buffer, size, &err);
+ int result = init_tree_desc_internal(desc, buffer, size, &err, flags);
if (result)
error("%s", err.buf);
strbuf_release(&err);
