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And teach fsck to free it to save memory.
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This adds knowledge of delta objects to fsck-cache and various object
parsing code. A new switch to git-fsck-cache is provided to display the
maximum delta depth found in a repository.
Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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Noted by Frank Sorenson and Petr Baudis, patch rewritten by me.
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Fixes all in-code names that leaved during "big name change".
Signed-off-by: Alexey Nezhdanov <snake@penza-gsm.ru>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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not doing reachability analysis.
This avoids the dangling head problem, and means that just a
plain "git-fsck-cache" with no parameters will DTRT.
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explicit references for reachability analysis.
We already had that as separate logic in git-prune-script, so this
is not a new special case - it's an old special case moved into
fsck, making normal usage be much simpler.
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This is a follow-up fix to the earlier "Notice index that has
path and path/file and refuse to write such a tree" patch.
With this fix, git-fsck-cache complains if a tree object stores
more than one entries with the same name.
Signed-off-by: Junio C Hamano <junkio@cox.net>
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SHA1_FILE_DIRECTORIES environment variable is a colon separated paths
used when looking for SHA1 files not found in the usual place for
reading. Creating a new SHA1 file does not use this alternate object
database location mechanism. This is useful to archive older, rarely
used objects into separate directories.
Signed-off-by: Junio C Hamano <junkio@cox.net>
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The tree object parsing used to get the executable bit wrong,
and didn't know about symlinks. Also, fsck really wants the
full mode value so that it can verify the other bits for sanity,
so save it all in struct tree_entry.
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In particular, teach it about tags. Also, to make reachability actually
work for tags, we need to add the ref to the tagged object.
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(updated from the version posted to GIT mailing list).
When a new blob is registered with update-cache, and before the cache
is written as a tree and committed, git-fsck-cache will find the blob
unreachable. This patch adds a new flag, "--cache" to git-fsck-cache,
with which it keeps such blobs from considered "unreachable".
The git-prune-script is updated to use this new flag. At the same time
it adds .git/refs/*/* to the set of default locations to look for heads,
which should be consistent with expectations from Cogito users.
Without this fix, "diff-cache -p --cached" after git-prune-script has
pruned the blob object will fail mysteriously and git-write-tree would
also fail.
Signed-off-by: Junio C Hamano <junkio@cox.net>
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fsck_tag() failes to notice that the parsing of the tag may
have failed in the parse_object() call on the object that it
is tagging.
Noticed by Junio.
Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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We reported the type of te missing object incorrectly: we reported it as
the type of the referrer object, not the object that was referred to.
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We check the ordering of the entries, and we verify that none
of the entries has a slash in it (this allows us to remove the
hacky "has_full_path" member from the tree structure, since we
now just test it by walking the tree entries instead).
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This improves the cold-cache behaviour on most filesystems,
since it makes the fsck access patterns more regular on
the disk, rather than seeking back and forth.
Note the "most". Not all filesystems have any relationship
between inode number and location on disk.
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This allows the programs to use various simplified versions of
the SHA1 names, eg just say "HEAD" for the SHA1 pointed to by
the .git/HEAD file etc.
For example, this commit has been done with
git-commit-tree $(git-write-tree) -p HEAD
instead of the traditional "$(cat .git/HEAD)" syntax.
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Show the types of objects involved in broken links, and don't bother
warning about unreachable tag files (if somebody cares about tags,
they'll use the --tags flag to see them).
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we play with the d_type compatibility macros.
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Gracefully handle non-commit IDs instead of segfaulting.
Signed-off-by: Jonas Fonseca <fonseca@diku.dk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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With support for parse_object() and tags in the core, fsck_cache can just
call them, and can be simplified a bit.
Signed-Off-By: Daniel Barkalow <barkalow@iabervon.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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This makes the default fsck behaviour be quiet for a repository
that doesn't have any problems. Which is good.
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Normally we don't care, we just check them for being valid tag
objects.
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the name of the object it tags.
You need this if you actually want to build up a list of tags.
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You use "git-mktag" to create them, and fsck-cache knows how to parse them.
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Now that we have hopefully converted all old archives, we
can consider it an error.
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We should _not_ mark a blob object "parsed" just because we
looked it up: it gets marked that way only once we've actually
seen it. Otherwise we can never notice a missing blob.
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And add a "convert-cache" program to convert from old-style
to new-style.
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This got lost when I updated to Daniel's new object model.
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This was a real git merge with conflicts. I'll commit the scripts I used
to do the merge next.
Not pretty, but it's half-way functional.
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This ports fsck-cache to use parsing functions. Note that performance
could be improved here by only reading each object once, but this requires
somewhat more complicated flow control.
Signed-Off-By: Daniel Barkalow <barkalow@iabervon.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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This allows fsck to verify not just that an object exists, but
also that it has the type it was expected to have.
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- mark_reachable() can be more generic, marking the reachable revisions
with an arbitrary mask.
- date parsing will parse to a date of 0 rather than ULONG_MAX for the
bad old case, sorting the dates correctly.
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It's really a very generic thing: the notion of one sha1 revision
referring to another one. "fsck" uses it for all nodes, and "rev-tree"
only tracks commit-node relationships, but the code was already
the same - now we just make that explicit by moving it to a common
header file.
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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.
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parents that we reach multiple ways.
This doesn't matter right now. It _will_ matter once we have
complex revision graphs.
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This makes things a lot more efficient, and makes it trivial to do things
like reachability analysis.
Add command line flags to tell what the head is, and whether to warn
about unreachable objects.
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Now there is error() for "library" errors and die() for fatal "application"
errors. usage() is now used strictly only for usage errors.
Signed-off-by: Petr Baudis <pasky@ucw.cz>
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properly clear the reference count at init time. It happened to work
for me by pure luck.
Until it broke, and my unreferenced commit suddenly looked referenced
again. Fixed.
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Which made fsck very quiet about objects it hadn't found. So add
it.
We'll need to make things like these optional, because it's
perfectly ok to have partial history if you don't want it,
and don't want to go backwards. But for development, it's best
to always complain about missing sha1 object files that are
referenced from somewhere else.
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This shows that I've lost track of one commit already. Most likely
because I forgot to update the .dircache/HEAD file when doing a
commit, so that the next commit referenced not the top-of-tree, but
the one older commit.
Having dangling commits is fine (in fact, you should always have
at least _one_ dangling commit in the top-of-tree). But it's
good to know about them.
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pathnames in them. We're migrating away from that.
This will cause tons of warnings for the current "sparse" archive,
but hell, better now than later.
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This is totally untested, since we can't actually _write_ things that
way yet, but I'll get to that next, I hope. That should fix the
huge wasted space for kernel-sized tree objects.
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Once I do the reference tracking, I'll also make it print out all the
HEAD commits it finds, which is even more interesting.
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Patches from Dave Jones and Ingo Molnar, but since I don't have any
infrastructure in place to use the old patch applicator scripts I
am trying to build up, I ended up fixing the thing by hand instead.
Credit where credit is due, though. Nice to see that people are
taking a look at the project even in this early stage.
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internal format.
This doesn't yet check the reachability information, but we're getting
there.. Slowly.
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It doesn't complain about mine. But it also doesn't yet check for
inter-object reachability etc.
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Linus Torvalds
Nicolas Pitre
Alexey Nezhdanov
Junio C Hamano
Jonas Fonseca
Daniel Barkalow
Petr Baudis