Fix permissions, and add trivial "reset" and "add" scripts.

The "reset" script just resets the index back to head, while the "add"
script is just a crutch for people used to do "cvs add".

Paths in the host:path notation are usually interpreted
relative to the login directory rather than relative to
the root directory.
Signed-off-by: NSven Verdoolaege <skimo@liacs.nl>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

Unset TZ to force GMT in test #4 and add a set of parens around
the length function in the awk script.
Signed-off-by: NMark Allen <mrallen1@yahoo.com>
Acked-by: NRene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

No need to confuse ex-CVS users with a complex initial commit sequence.

Sine git only saves the 'x' bit, we shouldn't compare the stat contents
directly.

It's a simple helper that depending on the arguments will either
use git-diff-files, git-diff-cache or git-diff-tree.

Things like "--max-count=xxx" are "rev-only".

So now you can say

	git-whatchanged -p v2.6.12-rc5.. drivers/usb

and it will show you what changed (as a patch) in drivers/usb since the
v2.6.12-rc5 release.

Sometimes we only want to output revisions, and sometimes we want to
only see the stuff that wasn't revisions.  Teach git-rev-parse to
understand the "--revs-only" and "--no-revs" flags.

See the previous commit for explanations.

It's an incredibly cheesy helper that changes human-readable revision
arguments into the git-rev-list argument format.

You can use it to do something like this:

	git-rev-list --pretty $(git-rev-parse --default HEAD "$@")

which is what git-log-script will become. Here git-rev-parse will
then allow you to use arguments like "v2.6.12-rc5.." or similar
human-readable ranges.

It's really quite stupid: "a..b" will be converted into "a" and "^b" if
"a" and "b" are valid object pointers.  And the "--default" case will be
used if nothing but flags have been seen, so that you can default to a
certain argument if there are no other ranges.

Missing argument for error() function. We should really use the
gcc printf format checking capabilities.

Add "-z fuzz" argument, passed to cvsps, and clean up argument
processing.  Also, use "cvsps --cvs-direct", which is is somewhat
faster.

Give the user the option of specifying the timestamp fuzz passed to
cvsps.  Looking at the other arguments to it, I can't see anything else
that would be sane to play with.  Also, use --cvs-direct, which speeds
up cvsps for remote repositories and doesn't seem to do anything bad to
local repositories.
Signed-off-by: NTommy McGuire <mcguire@crsr.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

Slightly expand the cvsimport description, and make a couple of syntax
edits.

The way I figure it, telling someone why cvsimport is taking so long
will improve their overall user experience.  :-)
Signed-off-by: NTommy McGuire <mcguire@crsr.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

This patch adds some sanity checking to git-cvsimport-script,
specifically forcing the use of cvsps -x (to get the latest information
from the repository, rather than whatever is in the cache) and aborting
early if cvsps does not produce any output.

I debated removing the $MODULE directory following an abort, but I
eventually decided leaving stuff behind would make debugging easier.  On
the other hand, this patch should help with the "cvsimport left me with
an empty repository" complaints.

Call cvsps with the -x flag, to get the current state of the repository,
and abort the cvs import early if cvsps does not produce any output.
Signed-off-by: NTommy McGuire <mcguire@crsr.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

Remove unneeded sanity tests.  Remote repositories do, indeed, just
work.
Signed-off-by: NTommy McGuire <mcguire@crsr.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

Split the core of the program, diff_stage, from one big "main()"
function that does it all and leave only the parameter parsing,
setup and finalize part in the main().
Signed-off-by: NJunio C Hamano <junkio@cox.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

This patch teaches read-tree 3-way merge that, when only "the
other tree" changed a path, and if the index file already has
the same change, we are not in a situation that would clobber
the index and the work tree, and lets the merge succeed; this is
case #14ALT in t1000 test.  It does not change the result of the
merge, but prevents it from failing when it does not have to.
Signed-off-by: NJunio C Hamano <junkio@cox.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

This adds #3ALT rule (and #2ALT rule for symmetry) to the
read-tree 3-way merge logic that collapses paths that are added
only in one branch and not in the other internally.

This makes --emu23 to succeed in the last remaining case where
the pure 2-way merge succeeded and earlier one failed.  Running
diff between t1001 and t1005 test scripts shows that the only
difference between the two is that --emu23 can leave the states
into separate stages so that the user can use usual 3-way merge
resolution techniques to carry forward the local changes when
pure 2-way merge would have refused to run.
Signed-off-by: NJunio C Hamano <junkio@cox.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

This fixes too strong index requirement 3-way merge enforces in
one case: the same file is added in both branches.

In this case, the original code insisted that if the index file
has that path, it must match our branch and be up-to-date.
However in this particular case, it only has to match it, and
can be dirty.  We just need to make sure that we keep the
work-tree copy instead of checking out the merge result.

The resolution of such a path, however, cannot be left to
outside script, because we will not keep the original stage0
entries for unmerged paths when read-tree finishes, and at that
point, the knowledge of "if we resolve it to match the new file
added in both branches, the merge succeeds and the work tree
would not lose information, but we should _not_ update the work
tree from the resulting index file" is lost.  For this reason,
the now code needs to resolve this case (#5ALT) internally.

This affects some existing tests in the test suite, but all in
positive ways.  In t1000 (3-way test), this #5ALT case now gets
one stage0 entry, instead of an identical stage2 and stage3
entry pair, for such a path, and one test that checked for merge
failure (because the test assumed the "stricter-than-necessary"
behaviour) does not have to fail anymore.  In t1005 (emu23
test), two tests that involves a case where the work tree
already had a change introduced in the upstream (aka "merged
head"), the merge succeeds instead of failing.
Signed-off-by: NJunio C Hamano <junkio@cox.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

This new flag causes two-way fast forward to internally use the
three-way merge mechanism.  This behaviour is intended to offer
a better fast forward semantics when used in a dirty work tree.

The new test t1005 is parallel to the existing t1001 "pure
2-way" tests, but some parts that are commented out would fail.
These failures are due to three-way merge enforcing too strict
index requirements for cases that could succeed.  This problem
will be addressed by later patches.

Without even changing three-way mechanism, the --emu23 two-way
fast forward already gives the user an easier-to-handle merge
result when a file that "merged head" updates has local
modifications.  This is demonstrated as "case 16" test in t1005.
Signed-off-by: NJunio C Hamano <junkio@cox.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

This is in preparation for "2-way fast-forward emulated with
3-way mechanism" series.  It does not change what the tests for
pure 2-way do.  It only changes how it tests things, to make
reviewing of differences of the two tests easier in later steps.
Signed-off-by: NJunio C Hamano <junkio@cox.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

This is a halfway between debugging aid and a helper to write an
ultra-smart merge scripts.  The new option takes a string that
consists of a list of "status" letters, and limits the diff
output to only those classes of changes, with two exceptions:

 - A broken pair (aka "complete rewrite"), does not match D
   (deleted) or N (created).  Use B to look for them.

 - The letter "A" in the diff-filter string does not match
   anything itself, but causes the entire diff that contains
   selected patches to be output (this behaviour is similar to
   that of --pickaxe-all for the -S option).

For example,

    $ git-rev-list HEAD |
      git-diff-tree --stdin -s -v -B -C --diff-filter=BCR

shows a list of commits that have complete rewrite, copy, or
rename.
Signed-off-by: NJunio C Hamano <junkio@cox.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

Normally, diff-tree does not feed unchanged filepair to diffcore
for performance reasons, so copies are detected only when the
source file of the copy happens to be modified in the same
changeset.  This adds --find-copies-harder flag to tell
diff-tree to sacrifice the performance in order to find copies
the same way as other commands in diff-* family.
Signed-off-by: NJunio C Hamano <junkio@cox.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

Now -B does not say silly "complete rewrite" anymore for small
files such as the one in the tutorial example.
Signed-off-by: NJunio C Hamano <junkio@cox.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

When rename/copy uses a file that was broken by diffcore-break
as the source, and the broken filepair gets merged back later,
the output was mislabeled as a rename.  In this case, the source
file ends up staying in the output, so we should label it as a
copy instead.
Signed-off-by: NJunio C Hamano <junkio@cox.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

If you want the raw stuff, just do

	git-whatchanged --pretty=raw

and it wil act like it used to.

It set verbose, but didn't set the output prefix to "diff-tree".

This steals --pretty command line option from rev-list and
teaches diff-tree to do the same.  With this change,

    $ git-whatchanged --pretty

would work as expected.
Signed-off-by: NJunio C Hamano <junkio@cox.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

When an unmerged path was fed via diff_unmerged() into diffcore,
it eventually called run_diff() with "one" and "two" parameters
with NULL, but run_diff() was not written carefully enough to
notice this situation.
Signed-off-by: NJunio C Hamano <junkio@cox.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

A meaningful (ie non-empty) git patch always has more information in the
header than just the "diff --git" line itself: it needs to have either a
patch associated with it (which implies "---" and "+++" lines in the
header) or it needs to have rename/copy/delete/create information in it.

Just ignore git patches which have no change information. Otherwise we'll
end up with a patch that doesn't have filenames etc filled in, and we'll
be unhappy.

When we choose to omit deleted entries, we should subtract
numbers of such entries from the total number in the header.
Signed-off-by: NJunio C Hamano <junkio@cox.net>

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

Only when "-u" is used of course.

The diff-* brothers acquired a sibling, git-diff-stages.  With
an unmerged index file, you specify two stage numbers and it
shows the differences between them.
Signed-off-by: NJunio C Hamano <junkio@cox.net>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

This is the same as "-m", but it will silently ignore any unmerged
entries, which makes it useful for efficiently forcing a new position
regardless of the state of the current index file.

IOW, to reset to a previous HEAD (in case you have had a failed
merge, for example), you'd just do

	git-read-tree -u --reset HEAD

which will also update your working tree to the right state.

NOTE! The "update" will not remove files that may have been added by the
merge.  Yet.

This uses git-checkout-file to make sure that the full pathname is
created, instead of the script having to verify it by hand.  Also,
simplify the 3-way merge case by just writing to the right file and
setting the initial index contents early.

Junio points out that we may need to create the path leading
up the the file we merge.

And we need to be more careful with the "exec"s we've done
to exit on success - only do the on the last command in the
pipeline, not the first one ;)