Add "tag" objects that can be used to sign other objects.

You use "git-mktag" to create them, and fsck-cache knows how to parse them.

Fix up the types in write_sha1_file

Use "unsigned long" for the size, like we do everywhere else.

Simplify "write_sha1_file()" interfaces

The write function now adds the header to the file by itself, so there
is no reason to duplicate it among all the users any more.

fsck-cache: warn about missing commit dates

Now that we have hopefully converted all old archives, we
can consider it an error.

Update "convert-cache" to handle git itself.

The git archives have some old-date-format commits with timezones
that the converter didn't recognize. Also, make it be quiet about
already-converted dates.

[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>

[PATCH] checkout-cache: add "-n" option

This adds the "-n" option to checkout-cache which tells it to not check
out new files, only refresh files already checked out.

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

Don't add references to objects we couldn't find.

That would SIGSEGV.

Verify that the object type matches for tree/commit objects even before parsing.

The type doesn't come from the parsing, the type also has to match the usage.

Set object type at object creation time, not object parse time.

Otherwise we can have objects without a type, which is not good.

fsck-cache: notice missing "blob" objects.

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.

[PATCH] fix segfault in fsck-cache

Here is how to trigger it:

echo blob 100 > .git/objects/00/ae4e8d3208e09f2cf7a38202a126f728cadb49

Then run fsck-cache. It will try to unpack after the header to calculate
the hash, inflate returns total_out == 0 and memcpy() dies.

The patch below seems to work with ZLIB 1.1 and 1.2.

Signed-off-by: Andreas Gal <gal@uci.edu>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Support a fine-grained diff-tree

This is based on a patch by David Woodhouse, but with the selection
tests much simplified and streamlined.

It makes diff-tree take extra arguments, specifying the files or
directories which should be considered "interesting". Changes in
uninteresting directories are not reported.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

[PATCH] make file merging respect permissions

1) permissions aren't respected in the merge script (primarily because
they're never passed in to it in the first place). Fix that and also
check for permission conflicts in the merge

2) the delete of a file in both branches may indeed be just that, but it
could also be the indicator of a rename conflict (file moved to
different locations in both branches), so error out and ask the
committer for guidance.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

[PATCH] Allow multiple date-ordered lists

Make pop_most_recent_commit() return the same objects multiple times, but only
if called with different bits to mark.

This is necessary to make merge-base work again.

Signed-Off-By: Daniel Barkalow <barkalow@iabervon.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Don't add parents to the commit list if we have already
seen them.

Otherwise any merges will make the parent list explode.

Add "rev-list" program that uses the new time-based commit listing.

This is probably what you'd want to see for "git log".

[PATCH] Various transport programs

This patch adds three similar and related programs. http-pull downloads
objects from an HTTP server; rpull downloads objects by using ssh and
rpush on the other side; and rpush uploads objects by using ssh and rpull
on the other side.

The algorithm should be sufficient to make the network throughput required
depend only on how much content is new, not at all on how much content the
repository contains.

The combination should enable people to have remote repositories by way of
ssh login for authenticated users and HTTP for anonymous access.

Signed-Off-By: Daniel Barkalow <barkalow@iabervon.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

[PATCH] Replace merge-base implementation

The old implementation was a nice algorithm, but, unfortunately, it could
be confused in some cases and would not necessarily do the obvious thing
if one argument was decended from the other. This version fixes that by
changing the criterion to the most recent common ancestor.

Signed-Off-By: Daniel Barkalow <barkalow@iabervon.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

[PATCH] Additional functions for the objects database

This adds two functions: one to check if an object is present in the local
database, and one to add an object to the local database by reading it
from a file descriptor and checking its hash.

Signed-Off-By: Daniel Barkalow <barkalow@iabervon.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

[PATCH] Parse tree objects completely

This adds the contents of trees to struct tree.

Signed-Off-By: Daniel Barkalow <barkalow@iabervon.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

[PATCH] Add some functions for commit lists

This adds a function for inserting an item in a commit list, a function
for sorting a commit list by date, and a function for progressively
scanning a commit history from most recent to least recent.

Signed-Off-By: Daniel Barkalow <barkalow@iabervon.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

[PATCH] Simplify building of programs

Do not first build .o files when building programs.

Signed-off-by: Jonas Fonseca <fonseca@diku.dk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

[PATCH] Fix broken diff-cache output on added files

Added files were errorneously reported with the - prefix by diff-cache,
obviously leading to great confusion.

Signed-off-by: Petr Baudis <pasky@ucw.cz>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Make a hack to convert-cache for missing author dates in old
archives (notably the old sparse one).

Very hacky. But hopefully we can do the conversion once, and never
worry about this ever again.

Make "convert-cache" able to handle the really old archive formats

This includes the old-style "flat tree" object, and the old broken
date format. Well, enough of the date format to convert the sparse
archive, at least.

Use O_NOATIME when opening the sha1 files.

We really don't care about atime, and it sucks to dirty the
inode cache just for it.

This is more than a one-liner only because we need to be able to
clear the O_NOATIME flag in case some of the objects are owned
by others (in which case open will return EPERM), and because not
everybody has the O_NOATIME flag.

[PATCH] PPC assembly implementation of SHA1

Here is a SHA1 implementation with the core written in PPC assembly.
On my 2GHz G5, it does 218MB/s, compared to 135MB/s for the openssl
version or 45MB/s for the mozilla version.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

New "diff-cache" implementation.

This one is about a million times simpler, and much more likely to be
correct too.

Instead of trying to match up a tree object against the index, we just
read in the tree object side-by-side into the index, and just walk the
resulting index file. This was what all the read-tree cleanups were
all getting to.

Move "read_tree()" to "tree.c" to be used as a generic helper function.

Next step: make "diff-cache" use it.

Clean up and simplify read-tree a bit.

This is preparation for moving parts of it into "tree.c" to be used
as a library function.

Add support for alternate SHA1 library implementations.

This one includes the Mozilla SHA1 implementation sent in by Edgar Toernig.
It's dual-licenced under MPL-1.1 or GPL, so in the context of git, we
obviously use the GPL version.

Side note: the Mozilla SHA1 implementation is about twice as fast as the
default openssl one on my G5, but the default openssl one has optimized
x86 assembly language on x86. So choose wisely.

Split up Makefile library list handling with separate entries for
zlib and libssl.

I'll start giving people choices here..

Include <limits.h> in commit.c for ULONG_MAX. Remove old "revision.h".

The old revision.h helper header isn't used any more, but I never noticed
it until I started grepping for ULONG_MAX users.

Add support for a "GIT_INDEX_FILE" environment variable.

We use that to specify alternative index files, which can be useful
if you want to (for example) generate a temporary index file to do
some specific operation that you don't want to mess with your main
one with.

It defaults to the regular ".git/index" if it hasn't been specified.

Add the ability to prefix something to the pathname to "checkout-cache.c"

This basically makes it trivial to use checkout-cache as a "export as
tree" function. Just read the desired tree into the index, and do a

checkout-cache --prefix=export-dir/ -a

and checkout-cache will "export" the cache into the specified directory.

NOTE! The final "/" is important. The exported name is literally just
prefixed with the specified string, so you can also do something like

checkout-cache --prefix=.merged- Makefile

to check out the currently cached copy of "Makefile" into the file
".merged-Makefile".

Fix NSEC compile problem, and properly parse the rev-tree cmd line.

The rev-tree thing just happened to work. It shouldn't have.

[PATCH] Usage-string fixes.

Usage string fixes to make maintenance easier (only one instance
of a string to update not multiple copies). I've spotted and
corrected inconsistent usage text in diff-tree while doing this.

Also diff-cache and read-tree usage text have been corrected to
match their up-to-date features. Earlier, neither "--cached"
form of diff-cache nor "-m single-merge" form of read-tree were
described.

Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Duh, just make git-export.c use the proper syntax, everything is fine.

Fix up some problems from the commit->tree helper patch

Fix up git-export to use the lower-level interfaces for diff generation.

The high-level helpers seem to have forgotten what to do with sha1
names.

[PATCH] Teach read-tree about commit objects

Updates read-tree to use read_tree_with_tree_or_commit_sha1()
function. The command can take either tree or commit IDs with
this patch.

The change involves a slight modification of how it recurses down
the tree. Earlier the caller only supplied SHA1 and the recurser
read the object using it, but now it is the caller's responsibility
to read the object and give it to the recurser. This matches the
way recursive behaviour is done in other tree- related commands.

Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

[PATCH] Teach ls-tree about commit objects

Updates ls-tree.c to use read_tree_with_tree_or_commit_sha1()
function. The command can take either tree or commit IDs with
this patch.

Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

[PATCH] Teach diff-tree about commit objects

Updates diff-tree.c to use read_tree_with_tree_or_commit_sha1()
function. The command can take either tree or commit IDs with this patch.

Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

[PATCH] Teach diff-cache about commit objects

Updates diff-cache.c to use read_tree_with_tree_or_commit_sha1()
function. The end-user visible result is the same --- the command
takes either tree or commit ID.

Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

[PATCH] Accept commit in some places when tree is needed.

This patch implements read_tree_with_tree_or_commit_sha1(),
which can be used when you are interested in reading an unpacked
raw tree data but you do not know nor care if the SHA1 you
obtained your user is a tree ID or a commit ID. Before this
function's introduction, you would have called read_sha1_file(),
examined its type, parsed it to call read_sha1_file() again if
it is a commit, and verified that the resulting object is a
tree. Instead, this function does that for you. It returns
NULL if the given SHA1 is not either a tree or a commit.

Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

[PATCH] simplify Makefile

Use a generic rule for executables that depend only on the corresponding
.o and on $(LIB_FILE).

Signed-Off-By: Andre Noll <maan@systemlinux.org>
Signed-Off-By: Linus Torvalds <torvalds@osdl.org>

Improve build: add <unistd.h> and use -O2 instead of -O3

(Nobody should use -O3. It just makes bad inlining decisions).

Make the sha1 of the index file go at the very end of the file.

This allows us to both calculate it and verify it faster.

Speed up index file writing by chunking it nicely.

No point in making 17,000 small writes when you can make just
a couple of hundred nice 8kB writes instead and save a lot
of time.

Make "write_sha1_file()" exit early if the file already exists.

Avoid the compression.

The recent hash/compression switch-over missed the blob creation.

Happily, convert-cache just magically fixes all errors.

Do SHA1 hash _before_ compression.

And add a "convert-cache" program to convert from old-style
to new-style.

[PATCH] init-db.c: create and use safe_create_dir helper

Factor mkdir calls into common safe_create_dir subroutine.

Signed-Off-By: Zach Welch <zw@superlucidity.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

[PATCH] init-db.c: normalize env var handling.

Normalize init-db environment variable handling, allowing the creation
of object directories with something other than DEFAULT_DB_ENVIRONMENT.

Signed-Off-By: Zach Welch <zw@superlucidity.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

[PATCH] init-db.c: cleanup comments

Consolidate comments at top of main.

Signed-Off-By: Zach Welch <zw@superlucidity.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Make "diff-tree" take commit objects too, like "diff-cache" does.

Sometimes it's just easier to not have to look up the "commit"->"tree"
translation by hand first. It's trivial to do inside diff-tree, and
it's just being polite.

Add "diff-cache" helper program to compare a tree (or commit) with
the current cache state and/or working directory.

Very useful to see what has changed since the last commit, either in
the index file or in the whole working directory.

Also very possibly very buggy. Matching the two up is not entirely
trivial.

Make us be better at guessing a good hostname for the email.

It's still just a guess, and the result is not a real email
address anyway. If you want to, you can use COMMIT_AUTHOR_EMAIL
to correct for any git guesses.

Remove duplicate getenv(DB_ENVIRONMENT) call

Noted by Tony Luck.

Add stupid "git export" thing, which can export a git archive
as a set of patches and commentary.

You'd want something like this if you are tracking a git archive
in another SCM format. Notably, we want something like that for
BK users.

Fix init-db shared database case

Noted by Aaron Straus

Update "git-pull-script" to use "read-tree -m" for
reading a single tree too. That should speed up a
trivial merge noticeably.

Also, don't bother reading back the tree we just wrote
when we committed a real merge. It had better be the
same one we still have..

Make "read-tree" know how to do a "1-way merge".

This one just reads one tree, but picks up any matching stat information
from the old index.

Make "read-tree" take the 'stat' information for a merge result from the
old index state if the result matches.

This leaves the stat information in the result tree for any trivial
merges, which is just the way we like it.

Make git-pull-script do the right thing for symlinked HEAD's.

Also exit gracefully if the HEAD pull failed, rather than use
a possibly stale MERGE_HEAD.

Don't parse commit objects more than once.

Yes, the "parse_commit()" already checks for this condition, but
we need to check for it in rev-tree too, so that we don't start
walking the parent chain unnecessarily.

[PATCH] SCSI trees, merges and git status

Doing the latest SCSI merge exposed two bugs in your merge script:

1) It doesn't like a completely new directory (the misc tree contains a
new drivers/scsi/lpfc)
2) the merge testing logic is wrong. You only want to exit 1 if the
merge fails.

[PATCH] provide better committer information to commit-tree.c

Here's a small patch to commit-tree.c that does two things:
- allows the committer email address and name to be overridden
by environment variables (if you don't like the environment
variable names I've used (COMMIT_AUTHOR_NAME,
COMMIT_AUTHOR_EMAIL), feel free to change them.)
- provide the proper domainname to the author/committer email
address (otherwise, my address was only showing up as from the
hostname.)

This allows people to set sane values for the commit names and email
addresses, preventing odd, private hostnames and domains from being
exposed to the world.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Make fsck-cache print the object type for unreachable objects.

This got lost when I updated to Daniel's new object model.

[PATCH] show-diff: Remove stale comments

Patch 1/6 in the series has already cleaned the interface to
call sq_expand(), but the comment before that function still
carries the stale interface warning. Remove it.

Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

[PATCH] Do not let rsync obliterate .git/object symbolic link.

Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

[PATCH] show-diff.c: -R option for reverse diff.

This adds -R option to obtain reverse diff.

It may be useful in the merge workflow. After the base of the working
directory is merged and commited, in the working directory:

$ read-tree <tree-id-of-merged-tree>
$ show-diff -R

to re-validate if upstream changes make sense, and/or revert or
conflict with local changes you have in the working files.

Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

[PATCH] show-diff.c: make diff options customizable.

This makes the diff output formatting options customizable via the
environment variables. The default is still the Linux kernel style.

Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

[PATCH] show-diff.c: adjust default format for the Linux kernel.

This patch adjusts the default output format of show-diff to match
the Linux kernel style, recommended in Documentation/SubmittingPatches.

Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

[PATCH] show-diff.c: simplify show_diff_empty.

This patch removes the custom diff generation code from the
show_diff_empty() function. Instead, just use show_differences().

This reduces the code size; but more importantly, it is needed for
the later patch to give diff options.

Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

[PATCH] show-diff.c: check unreadbale blob.

This patch fixes show-diff to detect unreadable blob and warn
instead of going ahead and crashing.

Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

[PATCH] show-diff.c: clean up private buffer use.

This patch fixes sq_expand() and show_differences() not to use and
hold onto its privately allocated buffer, which was a misguided
attempt to reduce calls to malloc but made later changes harder.

Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Add "update-cache --refresh" to git-pull-script to make sure
out index is all ready to go after a pull.

Noted by Russell King

Change merge-cache and git-merge-one-file to use the SHA1 of the file
instead of a checked-out temporary copy.

If merging requires a checked-out-copy, we now do so with "unpack-file".

Add "unpack-file" helper that unpacks a sha1 blob into a tmpfile.

Add more header dependencies.

Yeah, my Makefiles are always a total disaster. Better this than autotools
or some horror like that, though.

Split up read-cache.c into more logical clumps.

Do the usage and error reporting in "usage.c", and the sha1 file
accesses in "sha1_file.c".

Small, nice, easily separated parts. Good.

Clean up the Makefile a bit.

This introduces the concept of git "library" objects that
the real programs use, and makes it easier to add such things
to a "libgit.a".

This will also make it trivial to split the current "read-cache.o"
into more aptly named pieces (it does a lot more than just read
the index file).

Add the simple scripts I used to do a merge with content conflicts.

They sure as hell aren't perfect, but they allow you to do:

./git-pull-script {other-git-directory}

to do the initial merge, and if that had content clashes, you do

merge-cache ./git-merge-one-file-script -a

which tries to auto-merge. When/if the auto-merge fails, it will
leave the last file in your working directory, and you can edit
it and then when you're happy you can do "update-cache filename"
on it. Re-do the merge-cache thing until there are no files left
to be merged, and now you can write the tree and commit:

write-tree
commit-tree .... -p $(cat .git/HEAD) -p $(cat .git/MERGE_HEAD)

and you're done.

Merge the new object model thing from Daniel Barkalow

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.

[PATCH] fix bug in read-cache.c which loses files when merging a tree

I noticed this when I tried a non-trivial scsi merge and checked the
results against BK. The problem is that remove_entry_at() actually
decrements active_nr, so decrementing it in add_cache_entry() before
calling remove_entry_at() is a double decrement (hence we lose cache
entries at the end).

[PATCH] Switch implementations of merge-base, port to parsing

This switches to my implementation of merge-base, but with the new parsing
library.

Signed-Off-By: Daniel Barkalow <barkalow@iabervon.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

[PATCH] Port fsck-cache to use parsing functions

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>

[PATCH] Port rev-tree to parsing functions

This ports rev-tree to use the parsing functions introduced in the
previous patches.

Signed-Off-By: Daniel Barkalow <barkalow@iabervon.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

[PATCH] Implementations of parsing functions

This implements the parsing functions.

Signed-Off-By: Daniel Barkalow <barkalow@iabervon.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

[PATCH] Header files for object parsing

This adds the structs and function declarations for parsing git objects.

Signed-Off-By: Daniel Barkalow <barkalow@iabervon.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

[PATCH] Fix confusing behaviour of update-cache --refresh on unmerged paths.

The "update-cache --refresh" command attempts refresh_entry()
on unmerged path, which results in as many "needs update" messages
as there are unmerged stages for that path. This does not do
any harm to the working directory, but it is confusing.

Here is a fix.

Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Update README to reflect the hierarchical tree objects,
and other newfangled things like merging.

Also, talk more about the actual operations, and give some
rough examples of what you can do.

[PATCH] (resend) show-diff.c off-by-one fix

The patch to introduce shell safety to show-diff has an
off-by-one error. Here is an fix.

Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Ass a "merge-cache" helper program to execute a merge on
any unmerged files.

This one doesn't actually do the merging, but it makes it
easy to script the programs that do using it.

[PATCH] fork optional branch point normazilation

Fix remove_specials for real. The second half logic needs the original
head of the string.

Signed-off-by: Brad Roberts <braddr@puremagic.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Ignore any unmerged entries for "checkout-cache -a".

They don't "exist" yet, and you need to merge them first.

Remove extraneous ',' ';' and '.' characters from the full name gecos field.

Apparently some distributions tend to have space for phone numbers etc there.

Make the revision tracking track the object types too.

This allows fsck to verify not just that an object exists, but
also that it has the type it was expected to have.