3a251bac0d
Fix the overly verbose trace2 logging added in9a4987677d(trace2: add stats for fsync operations, 2022-03-30) (first released with v2.36.0). Since that change every single "git" command invocation has included these "data" events, even though we'll only make use of these with core.fsyncMethod=batch, and even then only have non-zero values if we're writing object data to disk. Seec0f4752ed2(core.fsyncmethod: batched disk flushes for loose-objects, 2022-04-04) for that feature. As we're needing to indent the trace2_data_intmax() lines let's introduce helper variables to ensure that our resulting lines (which were already too) don't exceed the recommendations of the CodingGuidelines. Doing that requires either wrapping them twice, or introducing short throwaway variable names, let's do the latter. The result was that e.g. "git version" would previously emit a total of 6 trace2 events with the GIT_TRACE2_EVENT target (version, start, cmd_ancestry, cmd_name, exit, atexit), but afterwards would emit 8. We'd emit 2 "data" events before the "exit" event. The reason we didn't catch this was that the trace2 unit tests added ina15860dca3(trace2: t/helper/test-trace2, t0210.sh, t0211.sh, t0212.sh, 2019-02-22) would omit any "data" events that weren't the ones it cared about. Before this change to the C code 6/7 of our "t/t0212-trace2-event.sh" tests would fail if this change was applied to "t/t0212/parse_events.perl". Let's make the trace2 testing more strict, and further append any new events types we don't know about in "t/t0212/parse_events.perl". Since we only invoke the "test-tool trace2" there's no guarantee that we'll catch other overly verbose events in the future, but we'll at least notice if we start emitting new events that are issues every time we log anything with trace2's JSON target. We exclude the "data_json" event type, we'd otherwise would fail on both "win test" and "win+VS test" CI due to the logging added in353d3d77f4(trace2: collect Windows-specific process information, 2019-02-22). It looks like that logging should really be using trace2_cmd_ancestry() instead, which was introduced later in2f732bf15e(tr2: log parent process name, 2021-07-21), but let's leave it for now. The fix-up toaaf81223f4(unpack-objects: use stream_loose_object() to unpack large objects, 2022-06-11) is needed because we're changing the behavior of these events as discussed above. Since we'd always emit a "hardware-flush" event the test added inaaf81223f4wasn't testing anything except that this trace2 data was unconditionally logged. Even if "core.fsyncMethod" wasn't set to "batch" we'd pass the test. Now we'll check the expected number of "writeout" v.s. "flush" calls under "core.fsyncMethod=batch", but note that this doesn't actually test if we carried out the sync using that method, on a platform where we'd have to fall back to fsync() each of those "writeout" would really be a "flush" (i.e. a full fsync()). But in this case what we're testing is that the logic in "unpack-objects" behaves as expected, not the OS-specific question of whether we actually were able to use the "bulk" method. Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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 and Documentation/CodingGuidelines).
Those wishing to help with error message, usage and informational message
string translations (localization l10) should see po/README.md
(a po file is a Portable Object file that holds the translations).
To subscribe to the list, send an email with just "subscribe git" in the body to majordomo@vger.kernel.org (not the Git list). 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