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Commit Graph

11941 Commits

Author SHA1 Message Date
Gerrit Pape
fee9832a8d No longer install git-svnimport, move to contrib/examples
This has been proposed for a few times without much reaction
from the list.  Actually remove it to see who screams.

Signed-off-by: Gerrit Pape <pape@smarden.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-10-30 21:36:29 -07:00
Daniel Barkalow
09149c7809 Correct handling of upload-pack in builtin-fetch-pack
The field in the args was being ignored in favor of a static constant

Signed-off-by: Daniel Barkalow <barkalow@iabervon.org>
Thanked-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-10-29 20:32:22 -07:00
Lars Knoll
68492fc73b Speedup scanning for excluded files.
Try to avoid a lot of work scanning for excluded files,
by caching some more information when setting up the exclusion
data structure.

Speeds up 'git runstatus' on a repository containing the Qt sources by 30% and
reduces the amount of instructions executed (as measured by valgrind) by a
factor of 2.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-10-29 17:03:11 -07:00
Junio C Hamano
79f3368d9a RelNotes-1.5.4: describe recent updates
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-10-29 13:33:38 -07:00
Lars Hjemli
5072a32382 Teach git-pull about --[no-]ff, --no-squash and --commit
These options are supported by git-merge, but git-pull didn't know about
them.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-10-29 13:32:52 -07:00
Junio C Hamano
e2b7eaf0ca Merge branch 'maint'
* maint:
  RelNotes-1.5.3.5: describe recent fixes
  merge-recursive.c: mrtree in merge() is not used before set
  sha1_file.c: avoid gcc signed overflow warnings
  Fix a small memory leak in builtin-add
  honor the http.sslVerify option in shell scripts
2007-10-29 12:53:54 -07:00
Dan McGee
8371d8fd09 Remove outdated references to cogito in documentation
Signed-off-by: Dan McGee <dpmcgee@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-10-29 12:53:50 -07:00
Junio C Hamano
e720c4382f RelNotes-1.5.3.5: describe recent fixes
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-10-29 12:02:59 -07:00
Junio C Hamano
f120ae2a8e merge-recursive.c: mrtree in merge() is not used before set
The called function merge_trees() sets its *result, to which the
address of the variable mrtree in merge() function is passed,
only when index_only is set.  But that is Ok as the function
uses the value in the variable only under index_only iteration.

However, recent gcc does not realize this.  Work it around by
adding a fake initializer.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-10-29 12:00:55 -07:00
Junio C Hamano
7109c889f1 sha1_file.c: avoid gcc signed overflow warnings
With the recent gcc, we get:

sha1_file.c: In check_packed_git_:
sha1_file.c:527: warning: assuming signed overflow does not
occur when assuming that (X + c) < X is always false
sha1_file.c:527: warning: assuming signed overflow does not
occur when assuming that (X + c) < X is always false

for a piece of code that tries to make sure that off_t is large
enough to hold more than 2^32 offset.  The test tried to make
sure these do not wrap-around:

    /* make sure we can deal with large pack offsets */
    off_t x = 0x7fffffffUL, y = 0xffffffffUL;
    if (x > (x + 1) || y > (y + 1)) {

but gcc assumes it can do whatever optimization it wants for a
signed overflow (undefined behaviour) and warns about this
construct.

Follow Linus's suggestion to check sizeof(off_t) instead to work
around the problem.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-10-29 11:56:57 -07:00
Benoit Sigoure
3b27428b9d core-tutorial: Catch up with current Git
No longer talk about Cogito since it's deprecated.  Some scripts (such as
git-reset or git-branch) have undergone builtinification so adjust the text
to reflect this.

Fix a typo in the description of git-show-branch (merges are indicated by a
`-', not by a `.').

git-pull/git-push do not seem to use the dumb git-ssh-fetch/git-ssh-upload
(the text was probably missing a word).

Adjust a link that wasn't rendered properly because it was wrapped.

Signed-off-by: Benoit Sigoure <tsuna@lrde.epita.fr>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-10-29 11:39:42 -07:00
Benoit Sigoure
399f0a8eed Fix a small memory leak in builtin-add
prune_directory and fill_directory allocated one byte per pathspec and never
freed it.

Signed-off-by: Benoit Sigoure <tsuna@lrde.epita.fr>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-10-29 11:39:07 -07:00
Aurelien Bompard
1c1f79a1e4 honor the http.sslVerify option in shell scripts
Signed-off-by: Aurélien Bompard <aurelien@bompard.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-10-28 14:16:59 -07:00
Alexandre Julliard
d53a35020d git.el: Run git-gc --auto after commits.
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-10-28 14:08:28 -07:00
Alexandre Julliard
2f6e86a86f git.el: Refresh only the changed file marks when marking/unmarking all.
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-10-28 14:08:28 -07:00
Alexandre Julliard
6df023884b git.el: Fix typo in git-update-saved-file error handling.
Spotted by Matthieu Lemerre.

Signed-off-by: Alexandre Julliard <julliard@winehq.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-10-28 14:08:28 -07:00
Alexandre Julliard
3697c5f37a git.el: Fix typo in "Reverted file" message.
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-10-28 14:08:28 -07:00
Junio C Hamano
9ad7c5ae8a git-fetch: do not fail when remote branch disappears
When the branch named with branch.$name.merge is not covered by
the fetch configuration for the remote repository named with
branch.$name.remote, we automatically add that branch to the set
of branches to be fetched.  However, if the remote repository
does not have that branch (e.g. it used to exist, but got
removed), this is not a reason to fail the git-fetch itself.

The situation however will be noticed if git-fetch was called by
git-pull, as the resulting FETCH_HEAD would not have any entry
that is marked for merging.

Acked-By: Daniel Barkalow <barkalow@iabervon.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-10-28 14:06:39 -07:00
Junio C Hamano
071a887766 Merge branch 'master' of git://git.kernel.org/pub/scm/gitk/gitk
* 'master' of git://git.kernel.org/pub/scm/gitk/gitk: (34 commits)
  gitk: Use the UI font for the diff/old version/new version radio buttons
  gitk: Simplify the code for finding commits
  gitk: Fix a couple more bugs in the path limiting
  gitk: Fix some bugs with path limiting in the diff display
  gitk: Use the status window for other functions
  gitk: Integrate the reset progress bar in the main frame
  gitk: Ensure tabstop setting gets restored by Cancel button
  gitk: Limit diff display to listed paths by default
  gitk: Fix Tcl error: can't unset findcurline
  gitk: Get rid of the diffopts variable
  gitk: Fix bug where the last few commits would sometimes not be visible
  gitk: Add a font chooser
  gitk: Keep track of font attributes ourselves instead of using font actual
  gitk: Use named fonts instead of the font specification
  gitk: Fix bug causing Tcl error when changing find match type
  gitk: Fix the tab setting in the diff display window
  gitk: Add progress bars for reading in stuff and for finding
  gitk: Fix a couple of bugs
  gitk: Simplify highlighting interface and combine with Find function
  gitk: Fix bug in generating patches
  ...
2007-10-28 14:04:48 -07:00
Paul Mackerras
7388bcbc54 gitk: Use the UI font for the diff/old version/new version radio buttons
This makes the radio buttons for selecting whether to see the full diff,
the old version or the new version use the same font as the other user
interface elements.

Signed-off-by: Paul Mackerras <paulus@samba.org>
2007-10-27 21:31:07 +10:00
Paul Mackerras
7b3b151528 Merge branch 'dev' 2007-10-27 21:23:20 +10:00
Paul Mackerras
cca5d946d6 gitk: Simplify the code for finding commits
This unifies findmore and findmorerev, and adds the ability to do
a search with or without wrap around from the end of the list of
commits to the beginning (or vice versa for reverse searches).
findnext and findprev are gone, and the buttons and keys for searching
all call dofind now.  dofind doesn't unmark the matches to start with.
Shift-up and shift-down are back by popular request, and the searches
they do don't wrap around.  The other keys that do searches (/, ?,
return, M-f) do wrapping searches except for M-g.

Signed-off-by: Paul Mackerras <paulus@samba.org>
2007-10-27 21:16:56 +10:00
Junio C Hamano
85b0045505 Merge branch 'ja/shorthelp'
* ja/shorthelp:
  help: remove extra blank line after "See 'git --help'" message
  On error, do not list all commands, but point to --help option
2007-10-26 23:26:49 -07:00
Junio C Hamano
a238917ba4 help: remove extra blank line after "See 'git --help'" message
The double LF were there only because we gave a list of common
commands.  WIth the list gone, there is no reason to have the
extra blank line.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-10-26 23:26:41 -07:00
Junio C Hamano
d633f702a0 Merge branch 'maint'
* maint:
  Fix generation of perl/perl.mak
  git-remote: fix "Use of uninitialized value in string ne"
2007-10-26 23:17:23 -07:00
Christian Couder
15387e32ff Test suite: reset TERM to its previous value after testing.
Using konsole, I get no colored output at the end of "t7005-editor.sh"
without this patch.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-10-26 23:17:19 -07:00
Junio C Hamano
dc2715554e Merge branch 'ph/color-test'
* ph/color-test:
  Support a --quiet option in the test-suite.
  Add some fancy colors in the test library when terminal supports it.
2007-10-26 23:17:14 -07:00
Jim Meyering
4a21d13db4 hooks-pre-commit: use \t, rather than a literal TAB in regexp
Signed-off-by: Jim Meyering <meyering@redhat.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-10-26 23:16:51 -07:00
Alex Riesen
d1a2057560 Fix generation of perl/perl.mak
The code generating perl/Makefile from Makefile.PL was causing trouble
because it didn't considered NO_PERL_MAKEMAKER and ran makemaker
unconditionally, rewriting perl.mak. Makemaker is FUBAR in ActiveState Perl,
and perl/Makefile has a replacement for it.

Besides, a changed Git.pm is *NOT* a reason to rebuild all the perl scripts,
so remove the dependency too.

Signed-off-by: Alex Riesen <raa.lkml@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-10-26 16:44:45 -07:00
Pierre Habouzit
c2e6b6d0d1 fast-import.c: fix regression due to strbuf conversion
Without this strbuf_detach(), it yields a double free later, the
command is in fact stashed, and this is not a memory leak.

Signed-off-by: Pierre Habouzit <madcoder@debian.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-10-26 15:28:09 -07:00
Pierre Habouzit
1ece127467 Support a --quiet option in the test-suite.
This shuts down the "*  ok ##: `test description`" messages.

Signed-off-by: Pierre Habouzit <madcoder@debian.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-10-24 22:44:14 -07:00
Pierre Habouzit
55db1df0c8 Add some fancy colors in the test library when terminal supports it.
Signed-off-by: Pierre Habouzit <madcoder@debian.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-10-24 22:44:14 -07:00
Junio C Hamano
d90a7fda35 Merge branch 'db/fetch-pack'
* db/fetch-pack: (60 commits)
  Define compat version of mkdtemp for systems lacking it
  Avoid scary errors about tagged trees/blobs during git-fetch
  fetch: if not fetching from default remote, ignore default merge
  Support 'push --dry-run' for http transport
  Support 'push --dry-run' for rsync transport
  Fix 'push --all branch...' error handling
  Fix compilation when NO_CURL is defined
  Added a test for fetching remote tags when there is not tags.
  Fix a crash in ls-remote when refspec expands into nothing
  Remove duplicate ref matches in fetch
  Restore default verbosity for http fetches.
  fetch/push: readd rsync support
  Introduce remove_dir_recursively()
  bundle transport: fix an alloc_ref() call
  Allow abbreviations in the first refspec to be merged
  Prevent send-pack from segfaulting when a branch doesn't match
  Cleanup unnecessary break in remote.c
  Cleanup style nit of 'x == NULL' in remote.c
  Fix memory leaks when disconnecting transport instances
  Ensure builtin-fetch honors {fetch,transfer}.unpackLimit
  ...
2007-10-24 21:59:50 -07:00
Miklos Vajna
2db9b49c6c git-send-email: add a new sendemail.to configuration variable
Some projects prefer to receive patches via a given email address.
In these cases, it's handy to configure that address once.

Signed-off-by: Miklos Vajna <vmiklos@frugalware.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-10-24 20:13:07 -07:00
Junio C Hamano
59b2023fbb git-remote: fix "Use of uninitialized value in string ne"
martin f krafft <madduck@madduck.net> writes:

> piper:~> git remote show origin
> * remote origin
>   URL: ssh://git.madduck.net/~/git/etc/mailplate.git
> Use of uninitialized value in string ne at /usr/local/stow/git/bin/git-remote line 248.

This is because there might not be branch.<name>.remote defined but
the code unconditionally dereferences $branch->{$name}{'REMOTE'} and
compares with another string.

Tested-by: Martin F Krafft <madduck@madduck.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-10-24 18:47:50 -07:00
Paul Mackerras
74a40c7110 gitk: Fix a couple more bugs in the path limiting
First, paths ending in a slash were not matching anything.  This fixes
path_filter to handle paths ending in a slash (such entries have to
match a directory, and can't match a file, e.g., foo/bar/ can't match
a plain file called foo/bar).

Secondly, clicking in the file list pane (bottom right) was broken
because $treediffs($ids) contained all the files modified by the
commit, not just those within the file list.  This fixes that too.

Signed-off-by: Paul Mackerras <paulus@samba.org>
2007-10-24 10:16:56 +10:00
Junio C Hamano
8d863c98b2 k.org git toppage: Add link to 1.5.3 release notes.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-10-23 12:10:55 -07:00
Paul Mackerras
3de07118f0 Merge branch 'master' into dev 2007-10-23 22:40:50 +10:00
Paul Mackerras
bd8f677e1c gitk: Fix some bugs with path limiting in the diff display
First, we weren't putting "--" between the ids and the paths in the
git diff-tree/diff-index/diff-files command, so if there was a tag
and a file with the same name, we could get an ambiguity in the
command.  This puts the "--" in to make it clear that the paths are
paths.

Secondly, this implements the path limiting for merge diffs as well
as the normal 2-way diffs.

Signed-off-by: Paul Mackerras <paulus@samba.org>
2007-10-23 22:37:23 +10:00
Paul Mackerras
4570b7e9d7 gitk: Use the status window for other functions
This sets the status window when reading commits, searching through
commits, cherry-picking or checking out a head.

Signed-off-by: Paul Mackerras <paulus@samba.org>
2007-10-23 21:19:06 +10:00
Paul Mackerras
a137a90f49 gitk: Integrate the reset progress bar in the main frame
This makes the reset function use a progress bar in the same location
as the progress bars for reading in commits and for finding commits,
instead of a progress bar in a separate detached window.  The progress
bar for resetting is red.

This also puts "Resetting" in the status window while the reset is in
progress.  The setting of the status window is done through an
extension of the interface used for setting the watch cursor.

Signed-off-by: Paul Mackerras <paulus@samba.org>
2007-10-23 21:12:49 +10:00
Paul Mackerras
94503918e4 gitk: Ensure tabstop setting gets restored by Cancel button
We weren't restoring the tabstop setting if the user pressed the
Cancel button in the Edit/Preferences window.  Also improved the
label for the checkbox (made it "Tab spacing" rather than the laconic
"tabstop") and moved it above the "Display nearby tags" checkbox.

Signed-off-by: Paul Mackerras <paulus@samba.org>
2007-10-23 10:33:38 +10:00
Paul Mackerras
7a39a17a87 gitk: Limit diff display to listed paths by default
When the user has specified a list of paths, either on the command line
or when creating a view, gitk currently displays the diffs for all files
that a commit has modified, not just the ones that match the path list.
This is different from other git commands such as git log.  This change
makes gitk behave the same as these other git commands by default, that
is, gitk only displays the diffs for files that match the path list.

There is now a checkbox labelled "Limit diffs to listed paths" in the
Edit/Preferences pane.  If that is unchecked, gitk will display the
diffs for all files as before.

When gitk is run with the --merge flag, it will get the list of unmerged
files at startup, intersect that with the paths listed on the command line
(if any), and use that as the list of paths.

Signed-off-by: Paul Mackerras <paulus@samba.org>
2007-10-23 10:15:11 +10:00
Jari Aalto
b5d21a4b68 On error, do not list all commands, but point to --help option
- Remove out call to list_common_cmds_help()
- Send error message to stderr, not stdout.

Signed-off-by: Jari Aalto <jari.aalto@cante.net>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2007-10-22 01:57:50 -04:00
Ralf Wildenhues
dd8175f83c git-cherry-pick: improve description of -x.
Reword the first sentence of the description of -x, in order to
make it easier to read and understand.

Signed-off-by: Ralf Wildenhues <Ralf.Wildenhues@gmx.de>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2007-10-22 01:38:19 -04:00
René Scharfe
c32f749fec Correct some sizeof(size_t) != sizeof(unsigned long) typing errors
Fix size_t vs. unsigned long pointer mismatch warnings introduced
with the addition of strbuf_detach().

Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2007-10-22 00:00:40 -04:00
Shawn O. Pearce
5be507fc95 Use PRIuMAX instead of 'unsigned long long' in show-index
Elsewhere in Git we already use PRIuMAX and cast to uintmax_t when
we need to display a value that is 'very big' and we're not exactly
sure what the largest display size is for this platform.

This particular fix is needed so we can do the incredibly crazy
temporary hack of:

    diff --git a/cache.h b/cache.h
    index e0abcd6..6637fd8 100644
    --- a/cache.h
    +++ b/cache.h
    @@ -6,6 +6,7 @@

     #include SHA1_HEADER
     #include <zlib.h>
    +#define long long long

     #if ZLIB_VERNUM < 0x1200
     #define deflateBound(c,s)  ((s) + (((s) + 7) >> 3) + (((s) + 63) >> 6) + 11)

allowing us to more easily look for locations where we are passing
a pointer to an 8 byte value to a function that expects a 4 byte
value.  This can occur on some platforms where sizeof(long) == 8
and sizeof(size_t) == 4.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2007-10-21 02:16:57 -04:00
Shawn O. Pearce
8a37e21dab Merge branch 'maint'
* maint:
  Describe more 1.5.3.5 fixes in release notes
  Fix diffcore-break total breakage
  Fix directory scanner to correctly ignore files without d_type
  Improve receive-pack error message about funny ref creation
  fast-import: Fix argument order to die in file_change_m
  git-gui: Don't display CR within console windows
  git-gui: Handle progress bars from newer gits
  git-gui: Correctly report failures from git-write-tree
  gitk.txt: Fix markup.
  send-pack: respect '+' on wildcard refspecs
  git-gui: accept versions containing text annotations, like 1.5.3.mingw.1
  git-gui: Don't crash when starting gitk from a browser session
  git-gui: Allow gitk to be started on Cygwin with native Tcl/Tk
  git-gui: Ensure .git/info/exclude is honored in Cygwin workdirs
  git-gui: Handle starting on mapped shares under Cygwin
  git-gui: Display message box when we cannot find git in $PATH
  git-gui: Avoid using bold text in entire gui for some fonts
2007-10-21 02:11:45 -04:00
Shawn O. Pearce
2ee52eb17c Describe more 1.5.3.5 fixes in release notes
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2007-10-21 02:04:02 -04:00
Linus Torvalds
6dd4b66fde Fix diffcore-break total breakage
Ok, so on the kernel list, some people noticed that "git log --follow"
doesn't work too well with some files in the x86 merge, because a lot of
files got renamed in very special ways.

In particular, there was a pattern of doing single commits with renames
that looked basically like

 - rename "filename.h" -> "filename_64.h"
 - create new "filename.c" that includes "filename_32.h" or
   "filename_64.h" depending on whether we're 32-bit or 64-bit.

which was preparatory for smushing the two trees together.

Now, there's two issues here:

 - "filename.c" *remained*. Yes, it was a rename, but there was a new file
   created with the old name in the same commit. This was important,
   because we wanted each commit to compile properly, so that it was
   bisectable, so splitting the rename into one commit and the "create
   helper file" into another was *not* an option.

   So we need to break associations where the contents change too much.
   Fine. We have the -B flag for that. When we break things up, then the
   rename detection will be able to figure out whether there are better
   alternatives.

 - "git log --follow" didn't with with -B.

Now, the second case was really simple: we use a different "diffopt"
structure for the rename detection than the basic one (which we use for
showing the diffs). So that second case is trivially fixed by a trivial
one-liner that just copies the break_opt values from the "real" diffopts
to the one used for rename following. So now "git log -B --follow" works
fine:

	diff --git a/tree-diff.c b/tree-diff.c
	index 26bdbdd..7c261fd 100644
	--- a/tree-diff.c
	+++ b/tree-diff.c
	@@ -319,6 +319,7 @@ static void try_to_follow_renames(struct tree_desc *t1, struct tree_desc *t2, co
	 	diff_opts.detect_rename = DIFF_DETECT_RENAME;
	 	diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT;
	 	diff_opts.single_follow = opt->paths[0];
	+	diff_opts.break_opt = opt->break_opt;
	 	paths[0] = NULL;
	 	diff_tree_setup_paths(paths, &diff_opts);
	 	if (diff_setup_done(&diff_opts) < 0)

however, the end result does *not* work. Because our diffcore-break.c
logic is totally bogus!

In particular:

 - it used to do

	if (base_size < MINIMUM_BREAK_SIZE)
		return 0; /* we do not break too small filepair */

   which basically says "don't bother to break small files". But that
   "base_size" is the *smaller* of the two sizes, which means that if some
   large file was rewritten into one that just includes another file, we
   would look at the (small) result, and decide that it's smaller than the
   break size, so it cannot be worth it to break it up! Even if the other
   side was ten times bigger and looked *nothing* like the samell file!

   That's clearly bogus. I replaced "base_size" with "max_size", so that
   we compare the *bigger* of the filepair with the break size.

 - It calculated a "merge_score", which was the score needed to merge it
   back together if nothing else wanted it. But even if it was *so*
   different that we would never want to merge it back, we wouldn't
   consider it a break! That makes no sense. So I added

	if (*merge_score_p > break_score)
		return 1;

   to make it clear that if we wouldn't want to merge it at the end, it
   was *definitely* a break.

 - It compared the whole "extent of damage", counting all inserts and
   deletes, but it based this score on the "base_size", and generated the
   damage score with

	delta_size = src_removed + literal_added;
	damage_score = delta_size * MAX_SCORE / base_size;

   but that makes no sense either, since quite often, this will result in
   a number that is *bigger* than MAX_SCORE! Why? Because base_size is
   (again) the smaller of the two files we compare, and when you start out
   from a small file and add a lot (or start out from a large file and
   remove a lot), the base_size is going to be much smaller than the
   damage!

   Again, the fix was to replace "base_size" with "max_size", at which
   point the damage actually becomes a sane percentage of the whole.

With these changes in place, not only does "git log -B --follow" work for
the case that triggered this in the first place, ie now

	git log -B --follow arch/x86/kernel/vmlinux_64.lds.S

actually gives reasonable results. But I also wanted to verify it in
general, by doing a full-history

	git log --stat -B -C

on my kernel tree with the old code and the new code.

There's some tweaking to be done, but generally, the new code generates
much better results wrt breaking up files (and then finding better rename
candidates). Here's a few examples of the "--stat" output:

 - This:
	include/asm-x86/Kbuild        |    2 -
	include/asm-x86/debugreg.h    |   79 +++++++++++++++++++++++++++++++++++------
	include/asm-x86/debugreg_32.h |   64 ---------------------------------
	include/asm-x86/debugreg_64.h |   65 ---------------------------------
	4 files changed, 68 insertions(+), 142 deletions(-)

      Becomes:

	include/asm-x86/Kbuild                        |    2 -
	include/asm-x86/{debugreg_64.h => debugreg.h} |    9 +++-
	include/asm-x86/debugreg_32.h                 |   64 -------------------------
	3 files changed, 7 insertions(+), 68 deletions(-)

 - This:
	include/asm-x86/bug.h    |   41 +++++++++++++++++++++++++++++++++++++++--
	include/asm-x86/bug_32.h |   37 -------------------------------------
	include/asm-x86/bug_64.h |   34 ----------------------------------
	3 files changed, 39 insertions(+), 73 deletions(-)

      Becomes

	include/asm-x86/{bug_64.h => bug.h} |   20 +++++++++++++-----
	include/asm-x86/bug_32.h            |   37 -----------------------------------
	2 files changed, 14 insertions(+), 43 deletions(-)

Now, in some other cases, it does actually turn a rename into a real
"delete+create" pair, and then the diff is usually bigger, so truth in
advertizing: it doesn't always generate a nicer diff. But for what -B was
meant for, I think this is a big improvement, and I suspect those cases
where it generates a bigger diff are tweakable.

So I think this diff fixes a real bug, but we might still want to tweak
the default values and perhaps the exact rules for when a break happens.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2007-10-21 01:59:42 -04:00