0be3278eec
Teach builtin_diffstat() to consult the hunk provider interface through diff_provider_consult(), new here: the consult-only entry that answers without loading content or computing, so it never returns DIFF_PROVIDER_ERROR. On an answer, the summing callback accumulates the provided counts directly into the diffstat entry; the blobs were already loaded for the binary check, so an answer saves the diff run, not the content load (blame, taught next, skips its loads too). On an unanswered outcome it computes as before and, with a writer attached, records what it computed; on unanswered-no-record it computes without recording. The provider behind the consult is the diff-hunks store, registered in front of the terminal builtin computation. Its consult serves a recorded pair through diff_hunks_replay(), which validates the sequence before any hunk reaches the callback, so direct accumulation is safe. The request gains the pair's object ids and the diff options read by the exclusions below. A side whose bytes are not a stored blob, such as a working-tree file or a gitlink, has a NULL id; the store passes it by and the terminal provider computes it. diff_provider_emit_hunks() walks the same chain, so blame's requests follow these rules the moment blame supplies identity. The walk also insists, as a BUG check, that a request's diff options belong to the repository whose chain it walks. Each exclusion lives with the provider whose key cannot express it. -I patterns and --anchored shape the diff outside the store key, and break detection (-B) rescores the pair outside it; the store's consult maps all three to stop-no-record, so such a request is neither served nor recorded for any consumer. The consumer-side guard the recording commit carried for those three comes out here. The compile-time assert on xpparam_t's layout sits next to that decision, forcing an explicit keying decision whenever a diff parameter is added. The stat consumer keeps only the exclusion that is not about the key: --ignore-blank-lines is part of the key but coalesces hunks differently between the text-emitting and coordinate-callback paths, so the consumer returns before consulting. A "log -L" range-scoped stat neither reads nor records; the line-range filter computes it as before. "git diff", "git log", "git show", and "git diff-tree" with the --stat, --numstat, and --shortstat formats consult the interface. Reading is controlled by core.diffHunks. An answer is invisible in the output, so the store counts the pairs it serves and the consultations it cannot, and diff_hunks_read_stats() reports both; the stat path emits the hits as a trace2 "read-hits" datum for tests and tuning. The counters live on the store because only the store knows whether a consultation reached it, and none of its exclusion legs reaches the replay, so none counts as a miss. Extend t4220 with the read half: - output parity with and without the store, at several context lengths and both directions, and reversed pairs keying apart; - the consultation made visible through the read-hits datum, and the trim-divergent pair correct at every context; - the settings that must bypass the store doing so in both directions (-I, -B, --anchored, --ignore-blank-lines), asserted through the trace rather than output parity alone, which a coincidentally equal count could satisfy; - a driver-forced algorithm keying apart rather than bypassing: it is part of the key, so a read under it misses the default entries and a warm records under its own. A "log -L" range-scoped stat neither reads nor records. Signed-off-by: Michael Montalbo <mmontalbo@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com> |
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| Documentation | ||
| bin-wrappers | ||
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| builtin | ||
| ci | ||
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| compiler-tricks | ||
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| ewah | ||
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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 https://git-scm.com/ including full documentation and Git related tools.
See Documentation/gittutorial.adoc to get started, then see
Documentation/giteveryday.adoc for a useful minimum set of commands, and
Documentation/git-<commandname>.adoc 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.adoc
(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 to git+subscribe@vger.kernel.org (see https://subspace.kernel.org/subscribing.html for details). The mailing list archives are available at https://lore.kernel.org/git/, https://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