The new merge world order tells the merge strategies to leave
the cache unmerged and store the automerge result in the working
tree if automerge is not clean.  This was done for the resolve
strategy and recursive strategy when no rename is involved, but
recording a conflicting merge in the rename case could not
easily be done by the recursive strategy.

This commit adds a new input format, in addition to the exsting
two, to "update-index --index-info".

    (1) mode         SP sha1          TAB path
    The first format is what "git-apply --index-info"
    reports, and used to reconstruct a partial tree
    that is used for phony merge base tree when falling
    back on 3-way merge.

    (2) mode SP type SP sha1          TAB path
    The second format is to stuff git-ls-tree output
    into the index file.

    (3) mode         SP sha1 SP stage TAB path
    This format is to put higher order stages into the
    index file and matches git-ls-files --stage output.

To place a higher stage entry to the index, the path should
first be removed by feeding a mode=0 entry for the path, and
then feeding necessary input lines in the (3) format.

For example, starting with this index:

$ git ls-files -s
100644 8a1218a1024a212bb3db30becd860315f9f3ac52 0       frotz

$ git update-index --index-info ;# interactive session -- input follows...

0 0000000000000000000000000000000000000000	frotz
100644 8a1218a1024a212bb3db30becd860315f9f3ac52 1	frotz
100755 8a1218a1024a212bb3db30becd860315f9f3ac52 2	frotz

The first line of the input feeds 0 as the mode to remove the
path; the SHA1 does not matter as long as it is well formatted.
Then the second and third line feeds stage 1 and stage 2 entries
for that path.  After the above, we would end up with this:

$ git ls-files -s
100644 8a1218a1024a212bb3db30becd860315f9f3ac52 1	frotz
100755 8a1218a1024a212bb3db30becd860315f9f3ac52 2	frotz

This completes the groundwork for the new merge world order.
Signed-off-by: NJunio C Hamano <junkio@cox.net>

git-update-index --index-info can almost be usable to read from ls-tree
output to update the index (and not the working tree file) to HEAD commit,
but not quite.  It was designed to read from git-apply --index-info
output, and does not want " blob " in ls-tree output.  Accept that as well.

This lets us update "git-checkout <ent> <path>" that used to filter the
extra " blob " string out.  Noted by Luben.
Signed-off-by: NJunio C Hamano <junkio@cox.net>

Removed unknown [--version] option.
Signed-off-by: NChris Shoemaker <c.shoemaker@cox.net>
Signed-off-by: NJunio C Hamano <junkio@cox.net>

This patch adds usage string to git-update-index, can be printed by the -h
or --help parameter.
Signed-off-by: NPetr Baudis <pasky@suse.cz>
Signed-off-by: NJunio C Hamano <junkio@cox.net>

Although the sole current user uses -z to read this, we should be
prepared for somebody to feed non-z format to the command.
Signed-off-by: NJunio C Hamano <junkio@cox.net>

This makes it possible to add paths that have funny characters (TAB
and LF) in them, and makes adding many paths more efficient in
general.

New flag "--stdin" to update-index was initially added for different
purpose, but it turns out to be a perfect match for feeding "ls-files
--others -z" output to improve "git add".

It also adds "--verbose" flag to update-index for use with "git add"
command.
Signed-off-by: NJunio C Hamano <junkio@cox.net>

With "[core] filemode = false", you can tell git to ignore
differences in the working tree file only in executable bit.

 * "git-update-index --refresh" does not say "needs update" if index
   entry and working tree file differs only in executable bit.

 * "git-update-index" on an existing path takes executable bit
   from the existing index entry, if the path and index entry are
   both regular files.

 * "git-diff-files" and "git-diff-index" without --cached flag
   pretend the path on the filesystem has the same executable
   bit as the existing index entry, if the path and index entry
   are both regular files.

If you are on a filesystem with unreliable mode bits, you may need to
force the executable bit after registering the path in the index.

 * "git-update-index --chmod=+x foo" flips the executable bit of the
   index file entry for path "foo" on.  Use "--chmod=-x" to flip it
   off.

Note that --chmod only works in index file and does not look at nor
update the working tree.

So if you are on a filesystem and do not have working executable bit,
you would do:

 1. set the appropriate .git/config option;

 2. "git-update-index --add new-file.c"

 3. "git-ls-files --stage new-file.c" to see if it has the desired
   mode bits.  If not, e.g. to drop executable bit picked up from the
   filesystem, say "git-update-index --chmod=-x new-file.c".
Signed-off-by: NJunio C Hamano <junkio@cox.net>

Signed-off-by: NJunio C Hamano <junkio@cox.net>

This adds more cruft to diff --git header to record the blob SHA1 and
the mode the patch/diff is intended to be applied against, to help the
receiving end fall back on a three-way merge.  The new header looks
like this:

    diff --git a/apply.c b/apply.c
    index 7be5041..8366082 100644
    --- a/apply.c
    +++ b/apply.c
    @@ -14,6 +14,7 @@
     //    files that are being modified, but doesn't apply the patch
     //  --stat does just a diffstat, and doesn't actually apply
    +//  --show-index-info shows the old and new index info for...
    ...

Upon receiving such a patch, if the patch did not apply cleanly to the
target tree, the recipient can try to find the matching old objects in
her object database and create a temporary tree, apply the patch to
that temporary tree, and attempt a 3-way merge between the patched
temporary tree and the target tree using the original temporary tree
as the common ancestor.

The patch lifts the code to compute the hash for an on-filesystem
object from update-index.c and makes it available to the diff output
routine.
Signed-off-by: NJunio C Hamano <junkio@cox.net>

This makes "git-update-index" avoid the new index file write if it didn't
make any changes to the index.

It still doesn't make things like "git status" be read-only operations in
general, but if the index file doesn't need refreshing, it now will at
least avoid making unnecessary changes.
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
Signed-off-by: NJunio C Hamano <junkio@cox.net>

Instead of "git status" ignoring (and hiding) potential errors from the
"git-update-index" call, make it exit if it fails, and show the error.

In order to do this, use the "-q" flag (to ignore not-up-to-date files)
and add a new "--unmerged" flag that allows unmerged entries in the index
without any errors.

This also avoids marking the index "changed" if an entry isn't actually
modified, and makes sure that we exit with an understandable error message
if the index is corrupt or unreadable. "read_cache()" no longer returns an
error for the caller to check.

Finally, make die() and usage() exit with recognizable error codes, if we
ever want to check the failure reason in scripts.
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
Signed-off-by: NJunio C Hamano <junkio@cox.net>

The new option --stdin reads list of paths to be updated from the
standard input.  As usual, -z means the paths are terminated with NUL
characters, as opposed to LF without that option.

This is useful to use git-diff-files -z and git-ls-files -z when the
platform xargs does not support -0 option, and obviously saves one
process even when xargs can take -0.
Signed-off-by: NJunio C Hamano <junkio@cox.net>

This is a long overdue clean-up to the code for parsing and passing
diff options.  It also tightens some constness issues.
Signed-off-by: NJunio C Hamano <junkio@cox.net>

Add -m/--modified to show files that have been modified wrt. the index.

[jc: The original came from Brian Gerst on Sep 1st but it only checked
if the paths were cache dirty without actually checking the files were
modified.  I also added the usage string and a new test.]
Signed-off-by: NJunio C Hamano <junkio@cox.net>

If the length in the stat information does not match what is recorded
in the index, there is no point rehashing the contents to see if the
index entry can be refreshed.

We need to be a bit careful.  Immediately after read-tree or
checkout-index without -u, ce_size is set to zero and does not match
the length of the blob that is recorded, and we need to actually look
at the contents to see if it has been changed.
Signed-off-by: NJunio C Hamano <junkio@cox.net>

This makes git-update-index error reporting much less confusing. The
user will know what went wrong with better precision, and will be given
a hopefully less confusing advice.
Signed-off-by: NPetr Baudis <pasky@suse.cz>
Signed-off-by: NJunio C Hamano <junkio@cox.net>

As promised, this is the "big tool rename" patch.  The primary differences
since 0.99.6 are:

  (1) git-*-script are no more.  The commands installed do not
      have any such suffix so users do not have to remember if
      something is implemented as a shell script or not.

  (2) Many command names with 'cache' in them are renamed with
      'index' if that is what they mean.

There are backward compatibility symblic links so that you and
Porcelains can keep using the old names, but the backward
compatibility support  is expected to be removed in the near
future.
Signed-off-by: NJunio C Hamano <junkio@cox.net>

If somebody tries to run `git update-cache foo', where foo is a new
file, git dies with a rather cryptic error message:

 fatal: Unable to add foo to database

This trivial patch makes git explain what probably went wrong.  It is
not a perfect diagnosis of all error paths, but for 90% of the cases it
should provide the user with the clue they need.

[jc: I ended up wording slightly differently, and fixed another
 confusing error message I noticed while reviewing the code.]
Signed-off-by: NAmos Waterland <apw@rossby.metr.ou.edu>
Signed-off-by: NJunio C Hamano <junkio@cox.net>

This also makes "./filename" acceptable as a side effect, since the
pathname normalization handles that too.
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
Signed-off-by: NJunio C Hamano <junkio@cox.net>

Change git-update-cache --refresh behaviour to use sha1's rather than
comparing byte by byte.

[JC demangled whitespace from the posted patch himself because he
 liked it so much.  Also adjusted to the index_fd() interface
 slightly done differently from the original one.]
Signed-off-by: NBryan Larsen <bryan.larsen@gmail.com>
Signed-off-by: NJunio C Hamano <junkio@cox.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

Add --info-only option to git-update-cache.

[JC demangled whitespace from the posted patch himself because he
 liked it so much.  Also adjusted to the index_fd() interface
 slightly done differently from the original one.]
Signed-off-by: NBryan Larsen <bryan.larsen@gmail.com>
Signed-off-by: NJunio C Hamano <junkio@cox.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

This patch makes the first half of write_sha1_file() and
index_fd() externally visible, to allow callers to compute the
object ID without actually storing it in the object database.

[JC demangled the whitespaces himself because he liked the patch
 so much, and reworked the interface to index_fd() slightly,
 taking suggestion from Linus and of his own.]
Signed-off-by: NBryan Larsen <bryan.larsen@gmail.com>
Signed-off-by: NJunio C Hamano <junkio@cox.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

It suppresses the "needs update" message for subsequent "--refresh"
cases (but not other errors).

Will be useful for "git commit". Stay tuned.

Make the --force-remove flag behave same as --add, --remove and
--replace. This means I can do

	git-update-cache --force-remove -- file1.c file2.c

which is probably saner and also makes it easier to use in cg-rm.
Signed-off-by: NPetr Baudis <pasky@ucw.cz>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

We still refuse to add ".", ".." and ".git".

In theory, you could track another git-repository by allowing ".git",
but the potential for confusion is just too high.

Fix various things that sparse complains about:
 - use NULL instead of 0
 - make sure we declare everything properly, or mark it static
 - use proper function declarations ("fn(void)" instead of "fn()")

Sparse is always right.

Fixes all in-code names that leaved during "big name change".
Signed-off-by: NAlexey Nezhdanov <snake@penza-gsm.ru>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

With -u flag, git-checkout-cache picks up the stat information
from newly created file and updates the cache.  This removes the
need to run git-update-cache --refresh immediately after running
git-checkout-cache.
Signed-off-by: NJunio C Hamano <junkio@cox.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

Signed-off-by: NBrad Roberts <braddr@puremagic.com>
Signed-off-by: NPetr Baudis <pasky@ucw.cz>

just free(archive_cache[i]) when replacing it there.

this patch fixes a 1-byte overflow in update-cache.c (probably not
exploitable). A specially crafted db object might trigger this overflow.

the bug is that normally the 'type' field is parsed by read_sha1_file(),
via:

	if (sscanf(buffer, "%10s %lu", type, size) != 2)

i.e. 0-10 long strings, which take 1-11 bytes of space. Normally the
type strings are stored in char [20] arrays, but in update-cache.c that
is char [10], so a 1 byte overflow might occur.

This should not happen with a 'friendly' DB, as the longest type string
("commit") is 7 bytes long. The fix is to use the customary char [20].

(someone might want to clean those open-coded constants up with a
TYPE_LEN define, they do tend to cause problems like this. I'm not
against open-coded constants (they make code much more readable), but
for fields that get filled in from possibly hostile objects this is
playing with fire.)

hey, this might be the first true security fix for GIT? ;-)
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NPetr Baudis <pasky@ucw.cz>

add_file_to_cache().

The error detection logic was too lazy to distinguish parameter
error and unable-to-add case.
Signed-off-by: NJunio C Hamano <junkio@cox.net>

When we used to have "path" as a file or a symlink, but now we
have "path/file" (or in general, have "path" as a directory), we
would want to remove "path" before adding "path/file".  The
logic in add_file_to_cache() only runs lstat() and does not
detect this case and fails to allow removing it in this case.
In the opposite case of having "path/file" in the index and
having "path" on the filesystem as a file or a symlink we do
allow removal of "path/file", so to be symmetric we should allow
it as well, without forcing the user to say --force-remove.
Signed-off-by: NJunio C Hamano <junkio@cox.net>

When "path" exists as a file or a symlink in the index, an
attempt to add "path/file" is refused because it results in file
vs directory conflict.  Similarly when "path/file1",
"path/file2", etc. exist, an attempt to add "path" as a file or
a symlink is refused.  With git-update-cache --replace, these
existing entries that conflict with the entry being added are
automatically removed from the cache, with warning messages.
Signed-off-by: NJunio C Hamano <junkio@cox.net>

It didn't properly mark all cache updates as being dirty, and
causes merge errors due to that. In particular, it didn't notice
when a file was force-removed.

Besides, it was ugly as hell. I've put in place a slightly cleaner
version, but I've not enabled the optimization because I don't
want to be burned again.

"Unused variable len"

Fix update-cache to compare the blob of a symlink against the link-target
and not the file it points to. Also ignore all permissions applied to
links.

Thanks to Greg for recognizing this while he added our list of symlinks
back to the udev repository.
Signed-off-by: NKay Sievers <kay.sievers@vrfy.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

The git-update-cache command, especially with --refresh, may not change
anything.  In such a case, writing 1.6MB of the same thing is a waste.
Signed-off-by: NJunio C Hamano <junkio@cox.net>

Allow to store and track symlink in the repository. A symlink is stored
the same way as a regular file, only with the appropriate mode bits set.
The symlink target is therefore stored in a blob object.
This will hopefully make our udev repository fully functional. :)
Signed-off-by: NKay Sievers <kay.sievers@vrfy.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>