No need to pass -r anymore, since diff-tree -p implies recursive
behaviour these days.
Signed-off-by: NJunio C Hamano <junkio@cox.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

This is an improved version of tar-tree, a streaming archive creator for
GIT.  The major added feature is blocking; all write(2) calls now have a
size of 10240, just as GNU tar (and tape drives) likes them.  The
buffering overhead does not seem to degrade performance because most
files in the repositories I tested this with are smaller than 10KB, so
we need fewer system calls. 

File names are still restricted to 500 bytes and the archive format
currently only allows for files up to 8GB.  Both restrictions can be
lifted if need be with more pax extended headers. 

The archive format used is the pax interchange format, i.e.  POSIX tar
format.  It can be read by (and created with) GNU tar.  If I read the
specs correctly tar-tree should now be standards compliant (modulo
bugs). 

Because it streams the archive (think ls-tree merged with cat-file),
tar-tree doesn't need to create any temporary files.  That makes it
quite fast. 

It accepts tree IDs and commit IDs as first parameter.  In the latter
case tar-tree tries to get the commit date out of the committer line. 
Else all files in the archive are time-stamped with the current time. 

An optional second parameter is used as a path prefix for all files in
the archive.  Example:

   $ tar-tree a2755a80f40e5794ddc20e00f781af9d6320fafb \
   linux-2.6.12-rc3 | bzip9 -9 > linux-2.6.12-rc3.tar.bz2
Signed-off-by: NRene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

This can be used with the famous dontdiff file as follows to find out
about uncommitted files just like dontdiff is used with the diff
command:

    show-files --others --exclude-from=dontdiff

and the exclude list can be reversed with the --ignore switch.
Signed-off-by: NNicolas Pitre <nico@cam.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

Nobody uses return value from show_new_file() function but it is
defined as returning int and falls off at the end without
returning.  Make it void.
Signed-off-by: NJunio C Hamano <junkio@cox.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

When diff-cache -p and friends are interrupted, they can leave
their temporary files behind.  Also when the external diff
program is killed instead of exiting (this usually happens when
piping the output to a pager, which can cause SIGPIPE when the
user quits viewing the diff early), they incorrectly died
without cleaning their temporary file.

This fixes these problems. 
Signed-off-by: NJunio C Hamano <junkio@cox.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

My bad.  diff-tree-helper reports all unmerged paths even when
the command line specifies to filter the paths.  This patch
fixes it.  Also reverse-diff option was left out during the last
round, which this patch restores as well.
Signed-off-by: NJunio C Hamano <junkio@cox.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

This changes the way the default arguments to diff are built when
diff-cache and friends are invoked with -p and there is no
GIT_EXTERNAL_DIFF environment variable.  It attempts to be more cg-patch
friendly by:

 - Showing diffs against /dev/null to denote added or removed
   files;

 - Showing file modes for existing files as a comment after the
   diff label.

Unfortunately with this change GIT_DIFF_CMD customization cannot
be supported easily anymore, so it has been dropped.
GIT_DIFF_OPTS customization to change diffs from unified to
context is still there, though.
Signed-off-by: NJunio C Hamano <junkio@cox.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

Make sure the Makefile knows about the object header dependencies, and
add declarations for tag lookup/parsing.

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: NDaniel Barkalow <barkalow@iabervon.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

This adds a function that parses an object from the database when we have
to look up its actual type. It also checks the hash of the file, due to
its heritage as part of fsck-cache.
Signed-Off-By: NDaniel Barkalow <barkalow@iabervon.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

This adds preliminary support for tags in the library. It doesn't even
store the signature, however, let alone provide any way of checking it.
Signed-Off-By: NDaniel Barkalow <barkalow@iabervon.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

This eliminates the special case for blobs versus other types of
objects. Now the scheme is entirely regular and I won't introduce stupid
bugs. (And fsck-cache doesn't have to do the do-nothing parse)
Signed-Off-By: NDaniel Barkalow <barkalow@iabervon.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

This makes diff-tree -p imply recursive behaviour.

Other commands in the family always takes a flat universe view
so this is not even needed.
Signed-off-by: NJunio C Hamano <junkio@cox.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

Now diff-tree can produce patch itself, there is no reason to
depend on Cogito to show diff in the git-export output anymore.
Signed-off-by: NJunio C Hamano <junkio@cox.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

With the recent "no-patch-by-default" change, the -s flag to the
show-diff command (and silent variable in the show-diff.c) became
meaningless.  This deprecates it. 

Cogito uses "show-diff -s" for the purpose of "I do not want the patch
text.  I just want to know if something has potentially changed, in
which case I know you will have some output.  I'll run update-cache
--refresh if you say something", so we cannot barf on seeing -s on our
command line yet. 
Signed-off-by: NJunio C Hamano <junkio@cox.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

This makes rsh.c compile on Darwin/MacOSX (and might possibly help on
some Linux distributions too).

sys/socket.h needs sys/types.h
Signed-off-by: NAndreas Gal <gal@uci.edu>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

The "base" string already contains any finishing "/", so the way
to get the full pathname is to just concatenate the base and
path directly, with no extra slashes in between.

Junio pointed out that diff-cache didn't handle the case of a new file
that was different from its index entry correctly. It needs to check
the working copy the same way the modified file case did.

This teaches diff-tree-helper to call diff_unmerge() so that it can
report unmerged paths to GIT_EXTERNAL_DIFF, instead of consuming it on
its own. 
Signed-off-by: NJunio C Hamano <junkio@cox.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

This uses the reworked diff interface to generate patches directly out
of diff-cache when -p is specified. 
Signed-off-by: NJunio C Hamano <junkio@cox.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

This uses the reworked diff interface to generate patches directly out
of diff-tree when -p is specified. 
Signed-off-by: NJunio C Hamano <junkio@cox.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

This uses the reworked diff interface to generate patches directly out
of show-diff when -p is specified. 
Signed-off-by: NJunio C Hamano <junkio@cox.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

This introduces three public functions for diff-cache and friends can
use to call out to the GIT_EXTERNAL_DIFF program when they wish to.

A normal "add/remove/change" entry is turned into 7-parameter process
invocation of GIT_EXTERNAL_DIFF program as before.  In addition, the
program can now be called with a single parameter when diff-cache and
friends want to report an unmerged path. 
Signed-off-by: NJunio C Hamano <junkio@cox.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

We now modify the in-memory copy of the index file in "diff-cache", so
we need to add PROT_WRITE. 

We've always warned about them properly, but we would then do the
wrong thing if that filename existed in the tree we were comparing
against (we'd think the file has been deleted, because we forgot
about the unmerged cases).

This makes it match "show-diff" behaviour.

This makes diff-tree-helper handle ("warn about") unmerged path entries

    U <path> <record-terminator>

This is emitted once per unmerged path, no matter how many unmerged
stages there are. 
Signed-off-by: NJunio C Hamano <junkio@cox.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

It really doesn't make sense, since there are potentially _many_ different
cache entries for an unmerged file. So just do the "U pathname" thing.

You'll need "diff-tree-helper" to show the full diff, but Junio is
dead set on adding a "-p" argument to all three to avoid it. That's
next..

When the trivial "read-tree" merge fails, fall back on the (equally
trivial) automatic merge script instead of forcing the user to do
it by hand.

When _that_ fails, you get to do a manual merge.

Introduce xmalloc and xrealloc to die gracefully with a descriptive
message when out of memory, rather than taking a SIGSEGV. 

Signed-off-by: Christopher Li<chrislgit@chrisli.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

This makes it a lot more pleasant to use when you
interrupt a long-running operation.

diff-cache attempts to first remove all merge entries before letting the
diff_cache() do its work, but it incorrectly stops after the first
merge-entry it finds.

Fix by just replacing the "break" with a "continue".
Signed-off-by: NJunio C Hamano <junkio@cox.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

This reworks the diff-tree-helper and show-diff to further make external
diff command interface simpler.

These commands now honor GIT_EXTERNAL_DIFF environment variable which
can point at an arbitrary program that takes 7 parameters:

  name file1 file1-sha1 file1-mode file2 file2-sha1 file2-mode

The parameters for an external diff command are as follows:

  name        this invocation of the command is to emit diff
	      for the named cache/tree entry.

  file1       pathname that holds the contents of the first
	      file.  This can be a file inside the working
	      tree, or a temporary file created from the blob
	      object, or /dev/null.  The command should not
	      attempt to unlink it -- the temporary is
	      unlinked by the caller.

  file1-sha1  sha1 hash if file1 is a blob object, or "."
	      otherwise.

  file1-mode  mode bits for file1, or "." for a deleted file.

If GIT_EXTERNAL_DIFF environment variable is not set, the
default is to invoke diff with the set of parameters old
show-diff used to use.  This built-in implementation honors the
GIT_DIFF_CMD and GIT_DIFF_OPTS environment variables as before.
Signed-off-by: NJunio C Hamano <junkio@cox.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

This patch introduces a new program, diff-tree-helper.  It reads
output from diff-cache and diff-tree, and produces a patch file.
The diff format customization can be done the same way the
show-diff uses; the same external diff interface introduced by
the previous patch to drive diff from show-diff is used so this
is not surprising.

It is used like the following examples:

   $ diff-cache --cached -z <tree> | diff-tree-helper -z -R paths...
   $ diff-tree -r -z <tree1> <tree2> | diff-tree-helper -z paths...

 - As usual, the use of the -z flag is recommended in the script
   to pass NUL-terminated filenames through the pipe between
   commands.

 - The -R flag is used to generate reverse diff.  It does not
   matter for diff-tree case, but it is sometimes useful to get
   a patch in the desired direction out of diff-cache.

 - The paths parameters are used to restrict the paths that
   appears in the output.  Again this is useful to use with
   diff-cache, which, unlike diff-tree, does not take such paths
   restriction parameters.
Signed-off-by: NJunio C Hamano <junkio@cox.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

With this patch, the non-core'ish part of show-diff command that
invokes an external "diff" comand to obtain patches is split
into a separate file.  The next patch will introduce a new
command, diff-tree-helper, which uses this common diff interface
to format diff-tree and diff-cache output into a patch form.
Signed-off-by: NJunio C Hamano <junkio@cox.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

This makes the default fsck behaviour be quiet for a repository
that doesn't have any problems. Which is good.

Normally we don't care, we just check them for being valid tag
objects.