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Jeff King 06dec439a3 diff: do not reuse worktree files that need "clean" conversion 
When accessing a blob for a diff, we may try to reuse file
contents in the working tree, under the theory that it is
faster to mmap those file contents than it would be to
extract the content from the object database.

When we have to filter those contents, though, that
assumption does not hold. Even for our internal conversions
like CRLF, we have to allocate and fill a new buffer anyway.
But much worse, for external clean filters we have to exec
an arbitrary script, and we have no idea how expensive it
may be to run.

So let's skip this optimization when conversion into git's
"clean" form is required. This applies whenever the
"want_file" flag is false. When it's true, the caller
actually wants the smudged worktree contents, which the
reused file by definition already has (in fact, this is a
key optimization going the other direction, since reusing
the worktree file there lets us skip smudge filters).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-07-22 12:31:24 -07:00
block-sha1
builtin Merge branch 'ar/diff-args-osx-precompose' into maint 2016-06-06 14:27:35 -07:00
ci travis-ci: build documentation 2016-05-10 11:19:07 -07:00
compat Merge branch 'kb/msys2-tty' into maint 2016-06-06 14:27:38 -07:00
contrib git-multimail: update to release 1.3.0 2016-05-03 14:04:27 -07:00
Documentation Git 2.8.4 2016-06-06 14:29:32 -07:00
ewah
git-gui
gitk-git
gitweb Merge branch 'sk/gitweb-highlight-encoding' into HEAD 2016-05-18 14:40:10 -07:00
mergetools
perl typofix: assorted typofixes in comments, documentation and messages 2016-05-06 13:16:37 -07:00
po l10n-2.8.0-rnd3-fr 2016-04-25 13:36:26 -07:00
ppc
refs set_worktree_head_symref(): fix error message 2016-04-08 10:26:23 -07:00
t diff: do not reuse worktree files that need "clean" conversion 2016-07-22 12:31:24 -07:00
templates
vcs-svn
xdiff Merge branch 'rj/xdiff-prepare-plug-leak-on-error-codepath' into maint 2016-04-14 18:57:46 -07:00
.gitattributes
.gitignore
.mailmap .mailmap: update to my shorter email address 2016-05-02 13:29:42 -07:00
.travis.yml Merge branch 'ls/travis-build-doc' into maint 2016-05-26 13:17:25 -07:00
abspath.c Windows: shorten code by re-using convert_slashes() 2016-04-04 18:03:02 -07:00
aclocal.m4
advice.c
advice.h
alias.c
alloc.c
archive-tar.c archive-tar: convert snprintf to xsnprintf 2016-05-26 10:44:26 -07:00
archive-zip.c
archive.c
archive.h
argv-array.c
argv-array.h
attr.c Merge branch 'ss/exc-flag-is-a-collection-of-bits' into maint 2016-04-14 18:37:15 -07:00
attr.h
base85.c
bisect.c
bisect.h
blob.c
blob.h
branch.c branch -m: update all per-worktree HEADs 2016-04-04 12:57:22 -07:00
branch.h branch -m: update all per-worktree HEADs 2016-04-04 12:57:22 -07:00
builtin.h
bulk-checkin.c
bulk-checkin.h
bundle.c bundle: don't leak an fd in case of early return 2016-04-01 10:33:18 -07:00
bundle.h
cache-tree.c
cache-tree.h
cache.h Merge branch 'js/windows-dotgit' into maint 2016-05-26 13:17:23 -07:00
check-builtins.sh
check-racy.c
check_bindir
color.c
color.h
column.c
column.h
combine-diff.c
command-list.txt
commit-slab.h
commit.c
commit.h
config.c Merge branch 'tb/core-eol-fix' into maint 2016-06-06 14:27:36 -07:00
config.mak.in
config.mak.uname mingw: make isatty() recognize MSYS2's pseudo terminals (/dev/pty*) 2016-05-26 13:12:02 -07:00
configure.ac Merge branch 'ky/imap-send-openssl-1.1.0' into maint 2016-05-06 14:53:24 -07:00
connect.c
connect.h
connected.c
connected.h
convert.c convert.c: ident + core.autocrlf didn't work 2016-04-25 12:12:03 -07:00
convert.h
copy.c
COPYING
credential-cache--daemon.c Merge branch 'jk/credential-cache-comment-exit' into maint 2016-04-14 18:37:16 -07:00
credential-cache.c credential-cache, send_request: close fd when done 2016-04-01 10:33:18 -07:00
credential-store.c
credential.c
credential.h
csum-file.c
csum-file.h
ctype.c
daemon.c
date.c
decorate.c
decorate.h
delta.h
diff-delta.c
diff-lib.c
diff-no-index.c
diff.c diff: do not reuse worktree files that need "clean" conversion 2016-07-22 12:31:24 -07:00
diff.h
diffcore-break.c
diffcore-delta.c
diffcore-order.c
diffcore-pickaxe.c
diffcore-rename.c Merge branch 'sg/diff-multiple-identical-renames' into maint 2016-04-29 14:15:55 -07:00
diffcore.h
dir.c dir.c: remove dead function fnmatch_icase() 2016-04-22 14:07:45 -07:00
dir.h dir.c: remove dead function fnmatch_icase() 2016-04-22 14:07:45 -07:00
editor.c
entry.c
environment.c Merge branch 'js/windows-dotgit' into maint 2016-05-26 13:17:23 -07:00
exec_cmd.c
exec_cmd.h
fast-import.c
fetch-pack.c fetch-pack: isolate sigpipe in demuxer thread 2016-04-20 13:33:56 -07:00
fetch-pack.h
fmt-merge-msg.h
fsck.c fsck: detect and warn a commit with embedded NUL 2016-05-10 10:02:06 -07:00
fsck.h
generate-cmdlist.sh
gettext.c
gettext.h
git-add--interactive.perl
git-archimport.perl
git-bisect.sh
git-compat-util.h Merge branch 'ky/imap-send-openssl-1.1.0' into maint 2016-05-06 14:53:24 -07:00
git-cvsexportcommit.perl
git-cvsimport.perl
git-cvsserver.perl typofix: assorted typofixes in comments, documentation and messages 2016-05-06 13:16:37 -07:00
git-difftool--helper.sh difftool/mergetool: make the form of yes/no questions consistent 2016-04-25 15:15:17 -07:00
git-difftool.perl difftool: handle unmerged files in dir-diff mode 2016-05-16 14:53:05 -07:00
git-filter-branch.sh
git-instaweb.sh
git-merge-octopus.sh
git-merge-one-file.sh
git-merge-resolve.sh
git-mergetool--lib.sh difftool/mergetool: make the form of yes/no questions consistent 2016-04-25 15:15:17 -07:00
git-mergetool.sh Merge branch 'nf/mergetool-prompt' into HEAD 2016-05-18 14:40:07 -07:00
git-p4.py git-p4: fix Git LFS pointer parsing 2016-04-28 10:03:13 -07:00
git-parse-remote.sh i18n: git-parse-remote.sh: mark strings for translation 2016-04-19 12:07:49 -07:00
git-quiltimport.sh
git-rebase--am.sh
git-rebase--interactive.sh rebase--interactive: avoid empty list in shell for-loop 2016-05-10 14:11:27 -07:00
git-rebase--merge.sh
git-rebase.sh
git-relink.perl
git-remote-testgit.sh
git-request-pull.sh
git-send-email.perl Merge branch 'jd/send-email-to-whom' into HEAD 2016-05-18 14:40:07 -07:00
git-sh-i18n.sh
git-sh-setup.sh
git-stash.sh
git-submodule.sh Merge branch 'sb/submodule-deinit-all' into maint 2016-05-31 14:09:46 -07:00
git-svn.perl
GIT-VERSION-GEN Git 2.8.4 2016-06-06 14:29:32 -07:00
git-web--browse.sh
git.c
git.rc
git.spec.in git.spec.in: use README.md, not README 2016-04-03 10:12:48 -07:00
gpg-interface.c
gpg-interface.h
graph.c
graph.h
grep.c
grep.h
hashmap.c
hashmap.h
help.c
help.h
hex.c
http-backend.c
http-fetch.c
http-push.c
http-walker.c
http.c Merge branch 'bn/http-cookiefile-config' into maint 2016-05-31 14:08:28 -07:00
http.h
ident.c Merge branch 'da/user-useconfigonly' into HEAD 2016-05-18 14:40:05 -07:00
imap-send.c Merge branch 'ky/imap-send-openssl-1.1.0' into maint 2016-05-06 14:53:24 -07:00
INSTALL
khash.h
kwset.c
kwset.h
levenshtein.c
levenshtein.h
LGPL-2.1
line-log.c
line-log.h
line-range.c
line-range.h
list-objects.c
list-objects.h
ll-merge.c
ll-merge.h
lockfile.c
lockfile.h
log-tree.c
log-tree.h
mailinfo.c
mailinfo.h
mailmap.c
mailmap.h
Makefile Merge branch 'va/i18n-misc-updates' into maint 2016-05-26 13:17:20 -07:00
match-trees.c
merge-blobs.c
merge-blobs.h
merge-recursive.c
merge-recursive.h
merge.c
mergesort.c
mergesort.h
name-hash.c
notes-cache.c
notes-cache.h
notes-merge.c
notes-merge.h
notes-utils.c
notes-utils.h
notes.c
notes.h
object.c
object.h
pack-bitmap-write.c
pack-bitmap.c
pack-bitmap.h
pack-check.c
pack-objects.c
pack-objects.h
pack-revindex.c
pack-revindex.h
pack-write.c
pack.h
pager.c
parse-options-cb.c
parse-options.c
parse-options.h
patch-delta.c
patch-ids.c
patch-ids.h
path.c Merge branch 'lp/typofixes' into maint 2016-05-26 13:17:21 -07:00
pathspec.c
pathspec.h
pkt-line.c
pkt-line.h
preload-index.c
pretty.c
prio-queue.c
prio-queue.h
progress.c
progress.h
prompt.c
prompt.h
quote.c
quote.h
reachable.c
reachable.h
read-cache.c
README.md
ref-filter.c
ref-filter.h
reflog-walk.c
reflog-walk.h
refs.c
refs.h refs: add a new function set_worktree_head_symref 2016-04-04 12:57:21 -07:00
RelNotes Git 2.8.4 2016-06-06 14:29:32 -07:00
remote-curl.c
remote-testsvn.c
remote.c Merge branch 'nd/remote-plural-ours-plus-theirs' into maint 2016-05-26 13:17:18 -07:00
remote.h
replace_object.c
rerere.c
rerere.h
resolve-undo.c
resolve-undo.h
revision.c
revision.h
run-command.c Merge branch 'jk/push-client-deadlock-fix' into HEAD 2016-05-18 14:40:06 -07:00
run-command.h Merge branch 'jk/push-client-deadlock-fix' into HEAD 2016-05-18 14:40:06 -07:00
send-pack.c send-pack: isolate sigpipe in demuxer thread 2016-04-20 13:33:53 -07:00
send-pack.h
sequencer.c
sequencer.h
server-info.c
setup.c Merge branch 'jc/xstrfmt-null-with-prec-0' into maint 2016-05-02 14:24:14 -07:00
sh-i18n--envsubst.c
sha1-array.c
sha1-array.h
sha1-lookup.c
sha1-lookup.h
sha1_file.c
sha1_name.c
shallow.c
shell.c
shortlog.h
show-index.c
sideband.c
sideband.h
sigchain.c
sigchain.h
split-index.c typofix: assorted typofixes in comments, documentation and messages 2016-05-06 13:16:37 -07:00
split-index.h
strbuf.c Merge branch 'jk/getwholeline-getdelim-empty' into maint 2016-04-14 18:57:46 -07:00
strbuf.h
streaming.c
streaming.h
string-list.c string_list: use string-list API in unsorted_string_list_lookup() 2016-04-25 11:48:27 -07:00
string-list.h
submodule-config.c Merge branch 'sb/misc-cleanups' into HEAD 2016-05-18 14:40:15 -07:00
submodule-config.h
submodule.c
submodule.h
symlinks.c
tag.c
tag.h
tar.h
tempfile.c
tempfile.h
test-chmtime.c
test-config.c
test-ctype.c
test-date.c
test-delta.c
test-dump-cache-tree.c
test-dump-split-index.c
test-dump-untracked-cache.c
test-fake-ssh.c
test-genrandom.c
test-hashmap.c
test-index-version.c
test-line-buffer.c
test-match-trees.c
test-mergesort.c
test-mktemp.c
test-parse-options.c
test-path-utils.c
test-prio-queue.c
test-read-cache.c
test-regex.c
test-revision-walking.c
test-run-command.c
test-scrap-cache-tree.c
test-sha1-array.c
test-sha1.c
test-sha1.sh
test-sigchain.c
test-string-list.c
test-submodule-config.c
test-subprocess.c
test-svn-fe.c
test-urlmatch-normalization.c
test-wildmatch.c
thread-utils.c
thread-utils.h
trace.c
trace.h
trailer.c
trailer.h
transport-helper.c typofix: assorted typofixes in comments, documentation and messages 2016-05-06 13:16:37 -07:00
transport.c
transport.h
tree-diff.c
tree-walk.c
tree-walk.h
tree.c
tree.h
unicode_width.h
unimplemented.sh
unix-socket.c
unix-socket.h
unpack-trees.c i18n: unpack-trees: avoid substituting only a verb in sentences 2016-05-12 16:28:43 -07:00
unpack-trees.h
update_unicode.sh
upload-pack.c
url.c
url.h
urlmatch.c
urlmatch.h
usage.c
userdiff.c
userdiff.h
utf8.c
utf8.h typofix: assorted typofixes in comments, documentation and messages 2016-05-06 13:16:37 -07:00
varint.c
varint.h
version.c
version.h
versioncmp.c
walker.c
walker.h
wildmatch.c typofix: assorted typofixes in comments, documentation and messages 2016-05-06 13:16:37 -07:00
wildmatch.h
worktree.c typofix: assorted typofixes in comments, documentation and messages 2016-05-06 13:16:37 -07:00
worktree.h
wrap-for-bin.sh
wrapper.c wrapper.c: delete dead function git_mkstemps() 2016-04-22 14:07:55 -07:00
write_or_die.c
ws.c
wt-status.c Merge branch 'sb/misc-cleanups' into HEAD 2016-05-18 14:40:15 -07:00
wt-status.h
xdiff-interface.c
xdiff-interface.h
zlib.c

README.md

Git - fast, scalable, distributed revision control system

Git is a fast, scalable, distributed revision control system with an unusually rich command set that provides both high-level operations and full access to internals.

Git is an Open Source project covered by the GNU General Public License version 2 (some parts of it are under different licenses, compatible with the GPLv2). It was originally written by Linus Torvalds with help of a group of hackers around the net.

Please read the file INSTALL for installation instructions.

Many Git online resources are accessible from http://git-scm.com/ including full documentation and Git related tools.

See Documentation/gittutorial.txt to get started, then see Documentation/giteveryday.txt for a useful minimum set of commands, and Documentation/git-commandname.txt for documentation of each command. If git has been correctly installed, then the tutorial can also be read with "man gittutorial" or "git help tutorial", and the documentation of each command with "man git-commandname" or "git help commandname".

CVS users may also want to read Documentation/gitcvs-migration.txt ("man gitcvs-migration" or "git help cvs-migration" if git is installed).

The user discussion and development of Git take place on the Git mailing list -- everyone is welcome to post bug reports, feature requests, comments and patches to git@vger.kernel.org (read Documentation/SubmittingPatches for instructions on patch submission). To subscribe to the list, send an email with just "subscribe git" in the body to majordomo@vger.kernel.org. The mailing list archives are available at http://news.gmane.org/gmane.comp.version-control.git/, http://marc.info/?l=git and other archival sites.

The maintainer frequently sends the "What's cooking" reports that list the current status of various development topics to the mailing list. The discussion following them give a good reference for project status, development direction and remaining tasks.

The name "git" was given by Linus Torvalds when he wrote the very first version. He described the tool as "the stupid content tracker" and the name as (depending on your mood):

  • random three-letter combination that is pronounceable, and not actually used by any common UNIX command. The fact that it is a mispronunciation of "get" may or may not be relevant.
  • stupid. contemptible and despicable. simple. Take your pick from the dictionary of slang.
  • "global information tracker": you're in a good mood, and it actually works for you. Angels sing, and a light suddenly fills the room.
  • "goddamn idiotic truckload of sh*t": when it breaks