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Jeff King f4eec0ba84 t5539: make timestamp requirements more explicit
The test for "no shallow lines after receiving ACK ready" is very
sensitive to the timestamps of the commits we create. It's looking for
the fetch negotiation to send a "ready", which in turn depends on the
order in which we traverse commits during the negotiation.

It works reliably now because the base commit "7" is created without
test_commit, and thus gets a commit time matching the current system
clock. Whereas the new commits created in this test do use test_commit,
and get the usual test_tick time from 2005. So the fetch into the
"clone" repository results in a commit graph like this (I omitted some
of the "unrelated" commits for clarity; they're all just a sequence of
test_ticks):

  $ git log --graph --format='%ct %s %d'
  * 1112912953 new  (origin/master, origin/HEAD)
  * 1594322236 7  (grafted, master)
  * 1112912893 unrelated15  (origin/unrelated15, unrelated15)
  [...]
  * 1112912053 unrelated1  (origin/unrelated1, unrelated1)
  * 1112911993 new-too  (HEAD -> newnew, tag: new-too)

The important things to see are:

  - "7" is way in the future compared to the other commits

  - "new-too" in the fetching repo is older than "new" (and its
    "unrelated" ancestors) in the shallow repo

If we change our "setup shallow clone" step to use test_tick, too (and
get rid of the dependency on the system clock), then the test will fail.
The resulting graph looks like this:

  $ git log --graph --format='%ct %s %d'
  * 1112913373 new  (origin/master, origin/HEAD)
  * 1112912353 7  (grafted, master)
  * 1112913313 unrelated15  (origin/unrelated15, unrelated15)
  [...]
  * 1112912473 unrelated1  (origin/unrelated1, unrelated1)
  * 1112912413 new-too  (HEAD -> newnew, tag: new-too)

Our "new-too" is still older than "new" and "unrelated", but now "7" is
older than all of them (because it advanced test_tick, which the other
tests built on top of). In the original, we advertised "7" as the first
"have" before anything else, but now "new-too" is more recent. You'd see
the same thing in the unlikely event that the system clock was set
before our test_tick default in 2005.

Let's make the timing requirements more explicit. The important thing is
that the client advertise all of its shared commits first, before
presenting its unique "new-too" commit. We can do that and get rid of
the system clock dependency at the same time by creating all of the
shared commits around time X (using test_tick), and then creating
"new-too" with some time long before X. The resulting graph looks like
this:

  $ git log --graph --format='%ct %s %d'
  * 1500001380 new  (origin/master, origin/HEAD)
  * 1500000420 7  (grafted, master)
  * 1500001320 unrelated15  (origin/unrelated15, unrelated15)
  [...]
  * 1500000480 unrelated1  (origin/unrelated1, unrelated1)
  * 1400000060 new-too  (HEAD -> newnew, tag: new-too)

That also lets us get rid of the hacky test_tick added by f0e802ca20
(t5539: update a flaky test, 2014-07-14). That was clearly dancing
around the same problem, but only addressed the relationship between
commits created in the two subshells (which did use test_tick, but
overlapped because increments of test_tick in subshells are lost). Now
that we're using consistent and well-placed times for both lines of
history, we don't have to care about a one-tick difference between the
two sides.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-07-10 11:56:01 -07:00
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t t5539: make timestamp requirements more explicit 2020-07-10 11:56:01 -07:00
templates Merge branch 'kw/fsmonitor-watchman-racefix' 2020-02-14 12:54:20 -08:00
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abspath.c
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add-interactive.h built-in add -p: respect the interactive.singlekey config setting 2020-01-15 12:06:17 -08:00
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advice.c add: change advice config variables used by the add API 2020-02-06 11:08:00 -08:00
advice.h add: change advice config variables used by the add API 2020-02-06 11:08:00 -08:00
alias.c
alias.h
alloc.c
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apply.c sha1-file: pass git_hash_algo to hash_object_file() 2020-01-31 10:45:39 -08:00
apply.h
archive-tar.c streaming: allow open_istream() to handle any repo 2020-01-31 10:45:39 -08:00
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archive.c
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argv-array.c
argv-array.h
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base85.c
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blame.c
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blob.c
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branch.c
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bulk-checkin.c
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CODE_OF_CONDUCT.md
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commit-graph.c Merge branch 'rs/commit-graph-code-simplification' 2020-03-05 10:43:04 -08:00
commit-graph.h commit-graph.h: use odb in 'load_commit_graph_one_fd_st' 2020-02-04 11:36:51 -08:00
commit-reach.c
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commit.c Merge branch 'rs/strbuf-insertstr' 2020-02-17 13:22:17 -08:00
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config.mak.in
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connect.h
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connected.h connected: verify promisor-ness of partial clone 2020-01-30 10:55:31 -08:00
convert.c Merge branch 'mt/use-passed-repo-more-in-funcs' 2020-02-14 12:54:22 -08:00
convert.h
copy.c
COPYING
credential-cache--daemon.c
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credential-store.c
credential.c Git 2.26.2 2020-04-19 16:32:24 -07:00
credential.h Git 2.26.1 2020-03-25 13:07:47 -07:00
csum-file.c
csum-file.h csum-file: introduce hashfile_total() 2020-01-23 10:51:50 -08:00
ctype.c
daemon.c
date.c date.c: switch to reentrant {gm,local}time_r 2019-11-30 13:50:48 -08:00
decorate.c
decorate.h
delta-islands.c
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delta.h
detect-compiler
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diff.h Merge branch 'hw/doc-in-header' 2019-12-16 13:08:39 -08:00
diffcore-break.c
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diffcore-order.c
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diffcore.h
dir-iterator.c
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fetch-negotiator.h
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fetch-pack.h
fmt-merge-msg.h
fsck.c Git 2.25.4 2020-04-19 16:31:07 -07:00
fsck.h
fsmonitor.c fsmonitor: handle version 2 of the hooks that will use opaque token 2020-01-13 14:58:43 -08:00
fsmonitor.h
fuzz-commit-graph.c
fuzz-pack-headers.c
fuzz-pack-idx.c
generate-cmdlist.sh
gettext.c
gettext.h
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git-archimport.perl
git-bisect.sh
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git-merge-octopus.sh
git-merge-one-file.sh
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git-mergetool.sh
git-p4.py git-p4: avoid leak of file handle when cloning 2020-01-30 12:21:13 -08:00
git-parse-remote.sh
git-quiltimport.sh
git-rebase--preserve-merges.sh
git-request-pull.sh
git-send-email.perl
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git-svn.perl git svn: stop using rebase --preserve-merges 2019-11-23 09:49:23 +09:00
GIT-VERSION-GEN Git 2.26.2 2020-04-19 16:32:24 -07:00
git-web--browse.sh
git.c sparse-checkout: create builtin with 'list' subcommand 2019-11-22 16:11:43 +09:00
git.rc
gpg-interface.c Merge branch 'hi/gpg-use-check-signature' 2020-03-05 10:43:05 -08:00
gpg-interface.h Merge branch 'hi/gpg-use-check-signature' 2020-03-05 10:43:05 -08:00
graph.c graph: fix collapse of multiple edges 2020-01-15 12:14:51 -08:00
graph.h
grep.c grep: replace grep_read_mutex by internal obj read lock 2020-01-17 13:52:14 -08:00
grep.h grep: replace grep_read_mutex by internal obj read lock 2020-01-17 13:52:14 -08:00
hash.h
hashmap.c
hashmap.h Merge branch 'en/doc-typofix' 2019-12-01 09:04:35 -08:00
help.c
help.h
hex.c
http-backend.c
http-fetch.c
http-push.c
http-walker.c
http.c Git 2.26.2 2020-04-19 16:32:24 -07:00
http.h
ident.c
imap-send.c
INSTALL Merge branch 'ar/install-doc-update-cmds-needing-the-shell' 2019-12-01 09:04:41 -08:00
interdiff.c
interdiff.h
iterator.h refs: introduce an iterator interface 2016-06-20 11:38:20 -07:00
json-writer.c
json-writer.h
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
linear-assignment.c
linear-assignment.h
list-objects-filter-options.c
list-objects-filter-options.h
list-objects-filter.c
list-objects-filter.h
list-objects.c
list-objects.h
list.h
ll-merge.c
ll-merge.h
lockfile.c
lockfile.h
log-tree.c Merge branch 'hd/show-one-mergetag-fix' into maint 2020-03-17 15:02:24 -07:00
log-tree.h
ls-refs.c
ls-refs.h *.[ch]: manually align parameter lists 2019-05-05 15:20:10 +09:00
mailinfo.c Merge branch 'rs/micro-cleanups' 2020-03-02 15:07:20 -08:00
mailinfo.h
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Makefile Merge branch 'bw/remote-rename-update-config' 2020-02-25 11:18:32 -08:00
match-trees.c
mem-pool.c
mem-pool.h
merge-blobs.c merge-blobs.c: remove implicit dependency on the_index 2018-09-21 09:48:10 -07:00
merge-blobs.h
merge-recursive.c Merge branch 'en/t3433-rebase-stat-dirty-failure' into maint 2020-03-17 15:02:23 -07:00
merge-recursive.h
merge.c
mergesort.c
mergesort.h
midx.c nth_packed_object_oid(): use customary integer return 2020-02-24 12:55:42 -08:00
midx.h
name-hash.c Merge branch 'en/doc-typofix' 2019-12-01 09:04:35 -08:00
notes-cache.c
notes-cache.h
notes-merge.c
notes-merge.h
notes-utils.c strbuf: add and use strbuf_insertstr() 2020-02-10 09:04:45 -08:00
notes-utils.h
notes.c Merge branch 'jh/notes-fanout-fix' into maint 2020-03-17 15:02:22 -07:00
notes.h Merge branch 'dl/format-patch-notes-config-fixup' 2019-12-25 11:21:58 -08:00
object-store.h packed_object_info(): use object_id for returning delta base 2020-02-24 12:55:53 -08:00
object.c Merge branch 'jk/object-filter-with-bitmap' 2020-03-02 15:07:18 -08:00
object.h pack-bitmap: fix leak of haves/wants object lists 2020-02-13 09:08:58 -08:00
oidmap.c
oidmap.h
oidset.c
oidset.h
pack-bitmap-write.c
pack-bitmap.c Merge branch 'jk/nth-packed-object-id' 2020-03-05 10:43:03 -08:00
pack-bitmap.h Merge branch 'jk/object-filter-with-bitmap' 2020-03-02 15:07:18 -08:00
pack-check.c pack-check: push oid lookup into loop 2020-02-24 12:55:53 -08:00
pack-objects.c pack-objects: convert oe_set_delta_ext() to use object_id 2020-02-24 12:55:52 -08:00
pack-objects.h pack-objects: convert oe_set_delta_ext() to use object_id 2020-02-24 12:55:52 -08:00
pack-revindex.c
pack-revindex.h
pack-write.c
pack.h
packfile.c packfile: drop nth_packed_object_sha1() 2020-02-24 12:55:53 -08:00
packfile.h packfile: drop nth_packed_object_sha1() 2020-02-24 12:55:53 -08:00
pager.c
parse-options-cb.c parse-options: simplify parse_options_dup() 2020-02-10 09:45:49 -08:00
parse-options.c Merge branch 'pb/am-show-current-patch' 2020-03-09 11:21:19 -07:00
parse-options.h Merge branch 'pb/am-show-current-patch' 2020-03-09 11:21:19 -07:00
patch-delta.c
patch-ids.c
patch-ids.h
path.c normalize_path_copy(): document "dst" size expectations 2020-01-30 13:45:58 -08:00
path.h
pathspec.c prefix_path: show gitdir if worktree unavailable 2020-03-15 09:35:46 -07:00
pathspec.h Merge branch 'hw/doc-in-header' 2019-12-16 13:08:39 -08:00
pkt-line.c
pkt-line.h pkt-line: fix a typo 2019-12-02 08:48:56 -08:00
preload-index.c
pretty.c Merge branch 'rs/strbuf-insertstr' 2020-02-17 13:22:17 -08:00
pretty.h
prio-queue.c
prio-queue.h
progress.c progress: create GIT_PROGRESS_DELAY 2019-11-27 10:57:10 +09:00
progress.h
promisor-remote.c
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prompt.c
prompt.h
protocol.c fetch: default to protocol version 2 2020-01-15 14:03:55 -08:00
protocol.h
quote.c quote: use isalnum() to check for alphanumeric characters 2020-02-24 09:30:29 -08:00
quote.h
range-diff.c range-diff: mark pointers as const 2019-12-06 12:34:49 -08:00
range-diff.h Merge branch 'dl/range-diff-with-notes' 2019-12-16 13:08:46 -08:00
reachable.c pack-bitmap: basic noop bitmap filter infrastructure 2020-02-14 10:46:22 -08:00
reachable.h
read-cache.c Merge branch 'js/mingw-loosen-overstrict-tree-entry-checks' 2020-01-10 14:45:27 -08:00
README.md doc: recommend lore.kernel.org over public-inbox.org 2019-11-30 09:12:04 -08:00
rebase-interactive.c Merge branch 'rt/format-zero-length-fix' 2020-03-09 11:21:21 -07:00
rebase-interactive.h Merge branch 'en/rebase-backend' 2020-03-02 15:07:19 -08:00
rebase.c pull --rebase/remote rename: document and honor single-letter abbreviations rebase types 2020-02-10 10:52:10 -08:00
rebase.h pull --rebase/remote rename: document and honor single-letter abbreviations rebase types 2020-02-10 10:52:10 -08:00
ref-filter.c Merge branch 'dr/push-remote-ref-update' 2020-03-11 10:58:16 -07:00
ref-filter.h
reflog-walk.c
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refs.c
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refspec.h
RelNotes Git 2.26.2 2020-04-19 16:32:24 -07:00
remote-curl.c Merge branch 'rs/show-progress-in-dumb-http-fetch' 2020-03-09 11:21:21 -07:00
remote-testsvn.c
remote.c remote: drop "explicit" parameter from remote_ref_for_branch() 2020-03-03 14:56:05 -08:00
remote.h remote: drop "explicit" parameter from remote_ref_for_branch() 2020-03-03 14:56:05 -08:00
replace-object.c replace-object: make replace operations thread-safe 2020-01-17 13:52:14 -08:00
replace-object.h replace-object: make replace operations thread-safe 2020-01-17 13:52:14 -08:00
repo-settings.c
repository.c
repository.h
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revision.c Merge branch 'dl/format-patch-notes-config-fixup' 2019-12-25 11:21:58 -08:00
revision.h Merge branch 'dl/format-patch-notes-config-fixup' 2019-12-25 11:21:58 -08:00
run-command.c Merge branch 'bc/run-command-nullness-after-free-fix' into maint 2020-02-14 12:42:27 -08:00
run-command.h run-command.h: fix mis-indented struct member 2020-02-22 09:05:34 -08:00
send-pack.c Merge branch 'jk/send-pack-check-negative-with-quick' 2019-12-06 15:09:22 -08:00
send-pack.h Add missing includes and forward declarations 2018-08-15 11:52:09 -07:00
sequencer.c Merge branch 'js/rebase-i-with-colliding-hash' into maint 2020-03-17 15:02:21 -07:00
sequencer.h Merge branch 'en/rebase-backend' 2020-03-02 15:07:19 -08:00
serve.c
serve.h
server-info.c
setup.c Merge branch 'es/outside-repo-errmsg-hints' 2020-03-16 12:43:29 -07:00
sh-i18n--envsubst.c
sha1-array.c
sha1-array.h
sha1-file.c packed_object_info(): use object_id for returning delta base 2020-02-24 12:55:53 -08:00
sha1-lookup.c
sha1-lookup.h
sha1-name.c nth_packed_object_oid(): use customary integer return 2020-02-24 12:55:42 -08:00
sha1dc_git.c
sha1dc_git.h
shallow.c
shell.c shell: use skip_prefix() instead of starts_with() 2019-11-27 11:18:24 +09:00
shortlog.h
sideband.c
sideband.h
sigchain.c
sigchain.h
split-index.c
split-index.h
stable-qsort.c
strbuf.c credential: allow wildcard patterns when matching config 2020-02-20 13:05:43 -08:00
strbuf.h Merge branch 'bc/wildcard-credential' 2020-03-05 10:43:02 -08:00
streaming.c streaming: allow open_istream() to handle any repo 2020-01-31 10:45:39 -08:00
streaming.h streaming: allow open_istream() to handle any repo 2020-01-31 10:45:39 -08:00
string-list.c
string-list.h Merge branch 'en/string-list-can-be-custom-sorted' into maint 2020-02-14 12:42:27 -08:00
sub-process.c
sub-process.h
submodule-config.c Merge branch 'mr/show-config-scope' 2020-02-17 13:22:17 -08:00
submodule-config.h submodule-config: add skip_if_read option to repo_read_gitmodules() 2020-01-17 13:52:14 -08:00
submodule.c Merge branch 'dt/submodule-rm-with-stale-cache' into maint 2020-03-17 15:02:21 -07:00
submodule.h Sync with 2.22.2 2019-12-06 16:31:30 +01:00
symlinks.c
tag.c
tag.h
tar.h
tempfile.c
tempfile.h
thread-utils.c
thread-utils.h
tmp-objdir.c
tmp-objdir.h
trace2.c
trace2.h
trace.c
trace.h
trailer.c
trailer.h
transport-helper.c C: use skip_prefix() to avoid hardcoded string length 2020-01-31 13:03:45 -08:00
transport-internal.h
transport.c Merge branch 'jk/no-flush-upon-disconnecting-slrpc-transport' into maint 2020-02-14 12:42:28 -08:00
transport.h
tree-diff.c
tree-walk.c tree-walk.c: break circular dependency with unpack-trees 2020-02-04 10:32:15 -08:00
tree-walk.h tree-walk.c: break circular dependency with unpack-trees 2020-02-04 10:32:15 -08:00
tree.c
tree.h
unicode-width.h unicode: update the width tables to Unicode 13.0 2020-03-17 15:06:37 -07:00
unimplemented.sh
unix-socket.c
unix-socket.h
unpack-trees.c Merge branch 'en/simplify-check-updates-in-unpack-trees' into maint 2020-03-17 15:02:25 -07:00
unpack-trees.h tree-walk.c: break circular dependency with unpack-trees 2020-02-04 10:32:15 -08:00
upload-pack.c config: split repo scope to local and worktree 2020-02-10 10:32:20 -08:00
upload-pack.h
url.c
url.h
urlmatch.c credential: allow wildcard patterns when matching config 2020-02-20 13:05:43 -08:00
urlmatch.h credential: allow wildcard patterns when matching config 2020-02-20 13:05:43 -08:00
usage.c
userdiff.c Merge branch 'ln/userdiff-elixir' 2019-12-25 11:21:59 -08:00
userdiff.h
utf8.c
utf8.h
varint.c
varint.h
version.c
version.h
versioncmp.c
walker.c Merge branch 'rs/show-progress-in-dumb-http-fetch' 2020-03-09 11:21:21 -07:00
walker.h remote-curl: show progress for fetches over dumb HTTP 2020-03-03 13:15:40 -08:00
wildmatch.c
wildmatch.h
worktree.c Merge branch 'hv/receive-denycurrent-everywhere' 2020-03-05 10:43:03 -08:00
worktree.h worktree: add utility to find worktree by pathname 2020-02-24 13:04:30 -08:00
wrap-for-bin.sh
wrapper.c
write-or-die.c
ws.c
wt-status.c
wt-status.h
xdiff-interface.c xdiff: avoid computing non-zero offset from NULL pointer 2020-01-28 23:13:25 -08:00
xdiff-interface.h
zlib.c

Build Status

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 https://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 https://lore.kernel.org/git/, http://marc.info/?l=git and other archival sites.

Issues which are security relevant should be disclosed privately to the Git Security mailing list git-security@googlegroups.com.

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