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Junio C Hamano b9849a1ab6 Make sure quickfetch is not fooled with a previous, incomplete fetch. 
This updates git-rev-list --objects to be a bit more careful
when listing a blob object to make sure the blob actually
exists, and uses it to make sure the quick-fetch optimization we
introduced earlier is not fooled by a previous incomplete fetch.

The quick-fetch optimization works by running this command:

	git rev-list --objects <<commit-list>> --not --all

where <<commit-list>> is a list of commits that we are going to
fetch from the other side.  If there is any object missing to
complete the <<commit-list>>, the rev-list would fail and die
(say, the commit was in our repository, but its tree wasn't --
then it will barf while trying to list the blobs the tree
contains because it cannot read that tree).

Usually we do not have the objects (otherwise why would we
fetching?), but in one important special case we do: when the
remote repository is used as an alternate object store
(i.e. pointed by .git/objects/info/alternates).  We could check
.git/objects/info/alternates to see if the remote we are
interacting with is one of them (or is used as an alternate,
recursively, by one of them), but that check is more cumbersome
than it is worth.

The above check however did not catch missing blob, because
object listing code did not read nor check blob objects, knowing
that blobs do not contain any further references to other
objects.  This commit fixes it with practically unmeasurable
overhead.

I've benched this with

	git rev-list --objects --all >/dev/null

in the kernel repository, with three different implementations
of the "check-blob".

 - Checking with has_sha1_file() has negligible (unmeasurable)
   performance penalty.

 - Checking with sha1_object_info() makes it somewhat slower,
   perhaps by 5%.

 - Checking with read_sha1_file() to cause a fully re-validation
   is prohibitively expensive (about 4 times as much runtime).

In my original patch, I had this as a command line option, but
the overhead is small enough that it is not really worth it.

Signed-off-by: Junio C Hamano <junkio@cox.net>
 		2007-04-17 00:14:59 -07:00
Documentation git-archive: make tar the default format 2007-04-09 18:51:40 -07:00
arm
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compat Add a compat/strtoumax.c for Solaris 8. 2007-02-19 18:20:30 -08:00
contrib Merge branch 'maint' 2007-04-05 16:34:51 -07:00
git-gui Merge branch 'master' of git://repo.or.cz/git-gui 2007-03-12 23:14:07 -07:00
gitweb Merge branch 'maint' 2007-04-05 16:34:51 -07:00
mozilla-sha1
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perl Do not output "GEN " when generating perl.mak 2007-03-14 01:33:49 -07:00
ppc Assorted typo fixes 2007-02-03 21:49:54 -08:00
t Make sure quickfetch is not fooled with a previous, incomplete fetch. 2007-04-17 00:14:59 -07:00
templates Reimplement emailing part of hooks--update in contrib/hooks/post-receive-email 2007-03-31 01:21:18 -07:00
xdiff xdiff/xutils.c(xdl_hash_record): factor out whitespace handling 2007-03-19 22:17:25 -07:00
.gitignore A new merge stragety 'subtree'. 2007-04-07 02:29:40 -07:00
.mailmap .mailmap maintenance after pulling from git-svn 2007-02-23 03:11:52 -08:00
COPYING
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GIT-VERSION-GEN GIT 1.5.1 2007-04-03 22:47:01 -07:00
INSTALL
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Makefile A new merge stragety 'subtree'. 2007-04-07 02:29:40 -07:00
README Update README to point at a few key periodical messages to the list 2007-03-25 17:42:32 -07:00
RelNotes Start 1.5.2 cycle by prepareing RelNotes for it. 2007-04-07 23:59:32 -07:00
alloc.c
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archive-tar.c convert object type handling from a string to a number 2007-02-27 01:34:21 -08:00
archive-zip.c convert object type handling from a string to a number 2007-02-27 01:34:21 -08:00
archive.h
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base85.c
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blob.c convert object type handling from a string to a number 2007-02-27 01:34:21 -08:00
blob.h
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builtin-add.c Merge branch 'jc/index-output' 2007-04-07 02:26:24 -07:00
builtin-annotate.c annotate: fix for cvsserver. 2007-02-06 01:52:04 -08:00
builtin-apply.c Merge branch 'jc/index-output' 2007-04-07 02:26:24 -07:00
builtin-archive.c git-archive: make tar the default format 2007-04-09 18:51:40 -07:00
builtin-blame.c blame: cmp_suspect is not "cmp" anymore. 2007-03-20 23:37:51 -07:00
builtin-branch.c Make builtin-branch.c handle the git config file 2007-04-06 16:54:39 -07:00
builtin-bundle.c Rename warn() to warning() to fix symbol conflicts on BSD and Mac OS 2007-03-31 01:11:11 -07:00
builtin-cat-file.c convert object type handling from a string to a number 2007-02-27 01:34:21 -08:00
builtin-check-ref-format.c
…
builtin-checkout-index.c _GIT_INDEX_OUTPUT: allow plumbing to output to an alternative index file. 2007-04-03 23:44:32 -07:00
builtin-commit-tree.c Cleanup check_valid in commit-tree. 2007-02-27 21:40:18 -08:00
builtin-config.c git-config: document --rename-section, provide --remove-section 2007-03-03 19:59:37 -08:00
builtin-count-objects.c Cast 64 bit off_t to 32 bit size_t 2007-03-07 11:15:26 -08:00
builtin-describe.c Mechanical conversion to use prefixcmp() 2007-02-20 22:03:15 -08:00
builtin-diff-files.c Allow git-diff exit with codes similar to diff(1) 2007-03-14 16:21:19 -07:00
builtin-diff-index.c Allow git-diff exit with codes similar to diff(1) 2007-03-14 16:21:19 -07:00
builtin-diff-tree.c Allow git-diff exit with codes similar to diff(1) 2007-03-14 16:21:19 -07:00
builtin-diff.c Allow git-diff exit with codes similar to diff(1) 2007-03-14 16:21:19 -07:00
builtin-fetch--tool.c git-fetch--tool pick-rref 2007-04-10 12:55:56 -07:00
builtin-fmt-merge-msg.c Merge branch 'maint' 2007-02-27 22:15:42 -08:00
builtin-for-each-ref.c General const correctness fixes 2007-03-07 10:47:10 -08:00
builtin-fsck.c Fix lost-found to show commits only referenced by reflogs 2007-04-05 15:00:03 -07:00
builtin-gc.c Make gc a builtin. 2007-03-17 00:34:19 -07:00
builtin-grep.c Initialize tree descriptors with a helper function rather than by hand. 2007-03-21 10:21:57 -07:00
builtin-init-db.c Mechanical conversion to use prefixcmp() 2007-02-20 22:03:15 -08:00
builtin-log.c Replace remaining instances of strdup with xstrdup. 2007-03-19 18:16:03 -07:00
builtin-ls-files.c Optimize directory listing with pathspec limiter. 2007-03-31 17:41:32 -07:00
builtin-ls-tree.c prefixcmp(): fix-up leftover strncmp(). 2007-02-20 22:03:15 -08:00
builtin-mailinfo.c git-mailinfo fixes for patch munging 2007-03-31 00:59:19 -07:00
builtin-mailsplit.c
…
builtin-merge-base.c
…
builtin-merge-file.c
…
builtin-mv.c Merge branch 'jc/index-output' 2007-04-07 02:26:24 -07:00
builtin-name-rev.c Merge branch 'js/name-rev-fix' 2007-02-20 22:24:03 -08:00
builtin-pack-objects.c clean up and optimize nth_packed_object_sha1() usage 2007-04-05 14:59:47 -07:00
builtin-pack-refs.c Mechanical conversion to use prefixcmp() 2007-02-20 22:03:15 -08:00
builtin-prune-packed.c
…
builtin-prune.c minor git-prune optimization 2007-03-20 22:17:47 -07:00
builtin-push.c git-push to multiple locations does not stop at the first failure 2007-04-07 02:27:31 -07:00
builtin-read-tree.c Merge branch 'jc/read-tree-df' (early part) 2007-04-07 23:52:40 -07:00
builtin-reflog.c Initialize tree descriptors with a helper function rather than by hand. 2007-03-21 10:21:57 -07:00
builtin-rerere.c rerere: make sorting really stable. 2007-04-04 14:12:03 -07:00
builtin-rev-list.c Make sure quickfetch is not fooled with a previous, incomplete fetch. 2007-04-17 00:14:59 -07:00
builtin-rev-parse.c prefixcmp(): fix-up leftover strncmp(). 2007-02-20 22:03:15 -08:00
builtin-revert.c git-revert: Revert revert message to old behaviour 2007-03-24 02:50:22 -07:00
builtin-rm.c _GIT_INDEX_OUTPUT: allow plumbing to output to an alternative index file. 2007-04-03 23:44:32 -07:00
builtin-runstatus.c
…
builtin-shortlog.c shortlog: prompt when reading from terminal by mistake 2007-03-14 01:33:41 -07:00
builtin-show-branch.c General const correctness fixes 2007-03-07 10:47:10 -08:00
builtin-show-ref.c Merge branch 'maint' 2007-02-24 01:42:06 -08:00
builtin-stripspace.c
…
builtin-symbolic-ref.c
…
builtin-tar-tree.c prefixcmp(): fix-up mechanical conversion. 2007-02-20 22:03:15 -08:00
builtin-unpack-objects.c convert object type handling from a string to a number 2007-02-27 01:34:21 -08:00
builtin-update-index.c Merge branch 'jc/index-output' 2007-04-07 02:26:24 -07:00
builtin-update-ref.c lock_any_ref_for_update(): do not accept malformatted refs. 2007-01-29 00:57:07 -08:00
builtin-upload-archive.c
…
builtin-verify-pack.c
…
builtin-write-tree.c _GIT_INDEX_OUTPUT: allow plumbing to output to an alternative index file. 2007-04-03 23:44:32 -07:00
builtin.h Make gc a builtin. 2007-03-17 00:34:19 -07:00
cache-tree.c
…
cache-tree.h
…
cache.h A new merge stragety 'subtree'. 2007-04-07 02:29:40 -07:00
check-builtins.sh
…
check-racy.c
…
color.c
…
color.h
…
combine-diff.c Cast 64 bit off_t to 32 bit size_t 2007-03-07 11:15:26 -08:00
commit.c Merge branch 'maint' to synchronize with 1.5.0.6 2007-03-28 15:39:57 -07:00
commit.h Merge branch 'js/commit-format' 2007-03-02 00:37:12 -08:00
config.c Fix renaming branch without config file 2007-04-05 14:53:22 -07:00
config.mak.in Add --with-tcltk and --without-tcltk to configure. 2007-03-31 23:59:47 -07:00
configure.ac Eliminate checks of user-specified Tcl/Tk interpreter. 2007-03-31 23:59:47 -07:00
connect.c Fix "getaddrinfo()" buglet 2007-03-27 13:00:13 -07:00
convert-objects.c General const correctness fixes 2007-03-07 10:47:10 -08:00
convert.c Make AutoCRLF ternary variable. 2007-02-14 11:19:28 -08:00
copy.c
…
csum-file.c
…
csum-file.h
…
ctype.c
…
daemon.c prefixcmp(): fix-up mechanical conversion. 2007-02-20 22:03:15 -08:00
date.c show_date(): rename the "relative" parameter to "mode" 2007-02-27 17:29:37 -08:00
delta.h
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diff-delta.c
…
diff-lib.c Teach --quiet to diff backends. 2007-03-14 16:21:19 -07:00
diff.c Show binary file size change in diff --stat 2007-04-05 15:07:16 -07:00
diff.h diff --quiet 2007-03-14 16:21:19 -07:00
diffcore-break.c Cast 64 bit off_t to 32 bit size_t 2007-03-07 11:15:26 -08:00
diffcore-delta.c
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diffcore-order.c Cast 64 bit off_t to 32 bit size_t 2007-03-07 11:15:26 -08:00
diffcore-pickaxe.c
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diffcore-rename.c Cast 64 bit off_t to 32 bit size_t 2007-03-07 11:15:26 -08:00
diffcore.h
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dir.c Optimize directory listing with pathspec limiter. 2007-03-31 17:41:32 -07:00
dir.h Optimize directory listing with pathspec limiter. 2007-03-31 17:41:32 -07:00
dump-cache-tree.c
…
entry.c Add core.symlinks to mark filesystems that do not support symbolic links. 2007-03-02 16:58:05 -08:00
environment.c Limit the size of the new delta_base_cache 2007-03-18 22:43:37 -07:00
exec_cmd.c Mechanical conversion to use prefixcmp() 2007-02-20 22:03:15 -08:00
exec_cmd.h
…
fast-import.c Rename warn() to warning() to fix symbol conflicts on BSD and Mac OS 2007-03-31 01:11:11 -07:00
fetch-pack.c Merge branch 'js/fetch-progress' (early part) 2007-03-04 17:31:21 -08:00
fetch.c Initialize tree descriptors with a helper function rather than by hand. 2007-03-21 10:21:57 -07:00
fetch.h
…
generate-cmdlist.sh
…
git-add--interactive.perl git-add -i: update removed path correctly. 2007-02-07 10:56:38 -08:00
git-am.sh Use diff* with --exit-code in git-am, git-rebase and git-merge-ours 2007-03-24 23:01:36 -07:00
git-applymbox.sh applymbox: brown paper bag fix. 2007-03-16 21:22:05 -07:00
git-applypatch.sh
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git-archimport.perl git-archimport: allow remapping branch names 2007-03-07 10:30:22 -08:00
git-bisect.sh git-bisect: allow bisecting with only one bad commit. 2007-04-06 17:55:57 -07:00
git-checkout.sh checkout: allow detaching to HEAD even when switching to the tip of a branch 2007-04-03 23:43:59 -07:00
git-clean.sh
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git-clone.sh http-fetch: don't use double-slash as directory separator in URLs 2007-03-28 04:44:16 -07:00
git-commit.sh git-read-tree --index-output=<file> 2007-04-03 23:44:32 -07:00
git-compat-util.h Rename warn() to warning() to fix symbol conflicts on BSD and Mac OS 2007-03-31 01:11:11 -07:00
git-cvsexportcommit.perl Merge branch 'maint' 2007-02-28 14:18:57 -08:00
git-cvsimport.perl cvsimport: Improve usage error reporting 2007-04-06 16:46:11 -07:00
git-cvsserver.perl cvsserver: further improve messages on commit and status 2007-03-14 02:09:33 -07:00
git-fetch.sh git-fetch: use fetch--tool pick-rref to avoid local fetch from alternate 2007-04-10 12:58:17 -07:00
git-instaweb.sh [PATCH] Rename git-repo-config to git-config. 2007-01-28 16:16:53 -08:00
git-lost-found.sh Fix lost-found to show commits only referenced by reflogs 2007-04-05 15:00:03 -07:00
git-ls-remote.sh Add git-bundle: move objects and references by archive 2007-02-22 22:30:33 -08:00
git-merge-octopus.sh
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git-merge-one-file.sh
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git-merge-ours.sh Use diff* with --exit-code in git-am, git-rebase and git-merge-ours 2007-03-24 23:01:36 -07:00
git-merge-resolve.sh Assorted typo fixes 2007-02-03 21:49:54 -08:00
git-merge-stupid.sh
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git-merge.sh A new merge stragety 'subtree'. 2007-04-07 02:29:40 -07:00
git-mergetool.sh mergetool: Clean up description of files and prompts for merge resolutions 2007-03-29 22:46:16 -04:00
git-p4import.py [PATCH] Rename git-repo-config to git-config. 2007-01-28 16:16:53 -08:00
git-parse-remote.sh git-fetch, git-branch: Support local --track via a special remote '.' 2007-03-16 02:10:12 -07:00
git-pull.sh
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git-quiltimport.sh git-quiltimport /bin/sh-ism fix 2007-03-29 23:11:33 -07:00
git-rebase.sh Use diff* with --exit-code in git-am, git-rebase and git-merge-ours 2007-03-24 23:01:36 -07:00
git-relink.perl
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git-remote.perl Teach git-remote to list pushed branches. 2007-03-20 01:54:49 -07:00
git-repack.sh [PATCH] Rename git-repo-config to git-config. 2007-01-28 16:16:53 -08:00
git-request-pull.sh
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git-reset.sh
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git-send-email.perl Avoid composing too long "References" header. 2007-04-06 16:49:44 -07:00
git-sh-setup.sh Commands requiring a work tree must not run in GIT_DIR 2007-02-05 14:02:16 -08:00
git-svn.perl git-svn: fix log command to avoid infinite loop on long commit messages 2007-04-08 19:54:07 -07:00
git-svnimport.perl
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git-tag.sh Fix git-tag -u 2007-01-30 21:03:11 -08:00
git-verify-tag.sh
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git.c Revert "builtin-archive: use RUN_SETUP" 2007-04-05 14:10:10 -07:00
git.spec.in RPM spec: include git-p4 in the list of all packages. 2007-04-04 16:01:49 -07:00
gitk [PATCH] prefer "git COMMAND" over "git-COMMAND" in gitk 2007-03-21 22:02:19 +11:00
grep.c
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grep.h
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hash-object.c index_fd(): pass optional path parameter as hint for blob conversion 2007-02-28 12:00:00 -08:00
help.c use xrealloc in help.c 2007-03-27 16:57:57 -07:00
http-fetch.c Fix lseek(2) calls with args 2 and 3 swapped 2007-04-05 15:39:12 -07:00
http-push.c Fix lseek(2) calls with args 2 and 3 swapped 2007-04-05 15:39:12 -07:00
http.c
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http.h
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ident.c Rename get_ident() to fmt_ident() and make it available to outside 2007-02-04 17:50:14 -08:00
imap-send.c prefixcmp(): fix-up leftover strncmp(). 2007-02-20 22:03:15 -08:00
index-pack.c Plug memory leak in index-pack collision checking codepath. 2007-04-03 19:04:56 -07:00
interpolate.c General const correctness fixes 2007-03-07 10:47:10 -08:00
interpolate.h General const correctness fixes 2007-03-07 10:47:10 -08:00
list-objects.c Initialize tree descriptors with a helper function rather than by hand. 2007-03-21 10:21:57 -07:00
list-objects.h
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local-fetch.c [PATCH] local-fetch.c: some error printing cleanup 2007-03-16 21:27:35 -07:00
lockfile.c git-read-tree --index-output=<file> 2007-04-03 23:44:32 -07:00
log-tree.c format-patch --attach: not folding some long headers. 2007-03-04 17:31:29 -08:00
log-tree.h
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match-trees.c A new merge stragety 'subtree'. 2007-04-07 02:29:40 -07:00
merge-file.c convert object type handling from a string to a number 2007-02-27 01:34:21 -08:00
merge-index.c Fix merge-index 2007-03-19 02:48:37 -07:00
merge-recursive.c A new merge stragety 'subtree'. 2007-04-07 02:29:40 -07:00
merge-tree.c Remove "pathlen" from "struct name_entry" 2007-03-21 10:21:56 -07:00
mktag.c convert object type handling from a string to a number 2007-02-27 01:34:21 -08:00
mktree.c convert object type handling from a string to a number 2007-02-27 01:34:21 -08:00
object-refs.c
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object.c Don't ever return corrupt objects from "parse_object()" 2007-03-20 22:17:17 -07:00
object.h get rid of lookup_object_type() 2007-02-27 01:34:21 -08:00
pack-check.c clean up and optimize nth_packed_object_sha1() usage 2007-04-05 14:59:47 -07:00
pack-redundant.c [PATCH] clean up pack index handling a bit 2007-03-16 21:27:36 -07:00
pack.h [PATCH] clean up pack index handling a bit 2007-03-16 21:27:36 -07:00
pager.c pager: Work around window resizing bug in 'less' 2007-02-05 15:42:36 -08:00
patch-delta.c
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patch-id.c
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path-list.c
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path-list.h
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path.c General const correctness fixes 2007-03-07 10:47:10 -08:00
peek-remote.c prefixcmp(): fix-up mechanical conversion. 2007-02-20 22:03:15 -08:00
pkt-line.c
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pkt-line.h
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quote.c Teach for-each-ref about a little language called Tcl. 2007-01-28 13:00:26 -08:00
quote.h Teach for-each-ref about a little language called Tcl. 2007-01-28 13:00:26 -08:00
reachable.c Initialize tree descriptors with a helper function rather than by hand. 2007-03-21 10:21:57 -07:00
reachable.h
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read-cache.c Merge branch 'jc/read-tree-df' (early part) 2007-04-07 23:52:40 -07:00
receive-pack.c Use run_command within receive-pack to invoke index-pack 2007-03-12 23:40:18 -07:00
reflog-walk.c log --reflog: use dwim_log 2007-02-08 17:48:22 -08:00
reflog-walk.h log --reflog: honour --relative-date 2007-02-08 16:20:52 -08:00
refs.c Make builtin-branch.c handle the git config file 2007-04-06 16:54:39 -07:00
refs.h scan reflogs independently from refs 2007-02-03 11:57:18 -08:00
revision.c Rename warn() to warning() to fix symbol conflicts on BSD and Mac OS 2007-03-31 01:11:11 -07:00
revision.h git-log --first-parent: show only the first parent log 2007-03-14 16:22:18 -07:00
rsh.c
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rsh.h
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run-command.c Teach run-command to redirect stdout to /dev/null 2007-03-12 23:40:17 -07:00
run-command.h Teach run-command to redirect stdout to /dev/null 2007-03-12 23:40:17 -07:00
send-pack.c Use run_command within send-pack 2007-03-12 23:40:18 -07:00
server-info.c Don't coredump on bad refs in update-server-info. 2007-01-31 13:09:58 -08:00
setup.c Merge branch 'maint' 2007-03-10 22:07:26 -08:00
sha1_file.c clean up and optimize nth_packed_object_sha1() usage 2007-04-05 14:59:47 -07:00
sha1_name.c clean up and optimize nth_packed_object_sha1() usage 2007-04-05 14:59:47 -07:00
shallow.c
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shell.c Mechanical conversion to use prefixcmp() 2007-02-20 22:03:15 -08:00
show-index.c
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sideband.c
…
sideband.h
…
ssh-fetch.c
…
ssh-pull.c
…
ssh-push.c
…
ssh-upload.c
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strbuf.c
…
strbuf.h
…
tag.c get rid of lookup_object_type() 2007-02-27 01:34:21 -08:00
tag.h
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tar.h
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test-chmtime.c Add test-chmtime: a utility to change mtime on files 2007-02-25 11:09:56 -08:00
test-date.c
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test-delta.c
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test-match-trees.c A new merge stragety 'subtree'. 2007-04-07 02:29:40 -07:00
test-sha1.c
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test-sha1.sh
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trace.c git-branch, git-checkout: autosetup for remote branch tracking 2007-03-10 23:41:58 -08:00
tree-diff.c tree_entry_interesting(): allow it to say "everything is interesting" 2007-03-22 00:36:00 -07:00
tree-walk.c Switch over tree descriptors to contain a pre-parsed entry 2007-03-21 11:15:26 -07:00
tree-walk.h Switch over tree descriptors to contain a pre-parsed entry 2007-03-21 11:15:26 -07:00
tree.c Initialize tree descriptors with a helper function rather than by hand. 2007-03-21 10:21:57 -07:00
tree.h
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unpack-file.c convert object type handling from a string to a number 2007-02-27 01:34:21 -08:00
unpack-trees.c Fix switching to a branch with D/F when current branch has file D. 2007-04-04 00:25:10 -07:00
unpack-trees.h unpack-trees: get rid of *indpos parameter. 2007-04-04 00:19:28 -07:00
update-server-info.c
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upload-pack.c git-upload-pack: make sure we close unused pipe ends 2007-03-29 01:41:23 -07:00
usage.c Rename warn() to warning() to fix symbol conflicts on BSD and Mac OS 2007-03-31 01:11:11 -07:00
utf8.c Merge branch 'maint' 2007-03-03 19:47:46 -08:00
utf8.h Actually make print_wrapped_text() useful 2007-02-27 17:29:02 -08:00
var.c
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write_or_die.c
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wt-status.c Optimize directory listing with pathspec limiter. 2007-03-31 17:41:32 -07:00
wt-status.h
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xdiff-interface.c Cast 64 bit off_t to 32 bit size_t 2007-03-07 11:15:26 -08:00
xdiff-interface.h
…

README 

////////////////////////////////////////////////////////////////

	GIT - the stupid content tracker

////////////////////////////////////////////////////////////////

"git" can mean anything, 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

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.
It was originally written by Linus Torvalds with help of a group of
hackers around the net. It is currently maintained by Junio C Hamano.

Please read the file INSTALL for installation instructions.
See Documentation/tutorial.txt to get started, then see
Documentation/everyday.txt for a useful minimum set of commands,
and "man git-commandname" for documentation of each command.
CVS users may also want to read Documentation/cvs-migration.txt.

Many Git online resources are accessible from http://git.or.cz/
including full documentation and Git related tools.

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. 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://marc.theaimsgroup.com/?l=git and other archival sites.

The messages titled "A note from the maintainer", "What's in
git.git (stable)" and "What's cooking in git.git (topics)" and
the discussion following them on the mailing list give a good
reference for project status, development direction and
remaining tasks.