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Jeff King 39b44ba771 check_everything_connected: assume alternate ref tips are valid 
When we receive a remote ref update to sha1 "X", we want to check that
we have all of the objects needed by "X". We can assume that our
repository is not currently corrupted, and therefore if we have a ref
pointing at "Y", we have all of its objects. So we can stop our
traversal from "X" as soon as we hit "Y".

If we make the same non-corruption assumption about any repositories we
use to store alternates, then we can also use their ref tips to shorten
the traversal.

This is especially useful when cloning with "--reference", as we
otherwise do not have any local refs to check against, and have to
traverse the whole history, even though the other side may have sent us
few or no objects. Here are results for the included perf test (which
shows off more or less the maximal savings, getting one new commit and
sharing the whole history):

Test                        HEAD^             HEAD
--------------------------------------------------------------------
[on git.git]
5600.3: clone --reference   2.94(2.86+0.08)   0.09(0.08+0.01) -96.9%
[on linux.git]
5600.3: clone --reference   45.74(45.34+0.41)   0.36(0.30+0.08) -99.2%

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-07-01 10:11:09 -07:00
..
config trace2: rename environment variables to GIT_TRACE2* 2019-05-28 10:20:34 -07:00
howto doc: format pathnames and URLs as monospace. 2019-03-13 11:14:22 +09:00
RelNotes Git 2.22-rc3 2019-06-03 11:25:12 -07:00
technical trace2: rename environment variables to GIT_TRACE2* 2019-05-28 10:20:34 -07:00
.gitattributes
.gitignore Merge branch 'js/misc-doc-fixes' 2019-05-09 00:37:27 +09:00
asciidoc.conf
asciidoctor-extensions.rb asciidoctor-extensions: fix spurious space after linkgit 2019-03-11 18:22:07 +09:00
blame-options.txt
build-docdep.perl
cat-texi.perl
cmd-list.perl
CodingGuidelines doc/CodingGuidelines: URLs and paths as monospace 2019-03-13 11:14:10 +09:00
config.txt trace2: update docs to describe system/global config settings 2019-04-16 13:37:07 +09:00
date-formats.txt
diff-format.txt log,diff-tree: add --combined-all-paths option 2019-02-07 20:15:25 -08:00
diff-generate-patch.txt log,diff-tree: add --combined-all-paths option 2019-02-07 20:15:25 -08:00
diff-options.txt Merge branch 'nd/diff-parseopt-3' 2019-04-16 19:28:03 +09:00
doc-diff doc-diff: add --cut-header-footer 2019-03-18 15:54:17 +09:00
docbook-xsl.css
docbook.xsl
everyday.txto
fetch-options.txt clone: send server options when using protocol v2 2019-04-18 10:53:51 +09:00
fix-texi.perl
git-add.txt docs: move core.excludesFile from git-add to gitignore 2019-03-08 09:12:45 +09:00
git-am.txt am/cherry-pick/rebase/revert: document --rerere-autoupdate 2019-03-18 10:24:56 +09:00
git-annotate.txt Use proper syntax for replaceables in command docs 2018-05-25 17:16:47 +09:00
git-apply.txt Merge branch 'nd/diff-apply-ita' 2018-06-25 13:22:36 -07:00
git-archimport.txt git-archimport.1: specify what kind of Arch we're talking about 2018-09-21 09:28:58 -07:00
git-archive.txt
git-bisect-lk2009.txt doc: fix ASCII art tab spacing 2018-10-23 12:23:09 +09:00
git-bisect.txt Merge branch 'ak/bisect-doc-typofix' 2018-04-25 13:28:56 +09:00
git-blame.txt diff: --indent-heuristic is no longer experimental 2017-11-02 14:51:24 +09:00
git-branch.txt Merge branch 'dl/branch-from-3dot-merge-base' 2019-05-19 16:45:28 +09:00
git-bundle.txt doc: keep first level section header in upper case 2018-05-02 17:03:33 +09:00
git-cat-file.txt Merge branch 'dt/cat-file-batch-ambiguous' 2019-02-06 22:05:21 -08:00
git-check-attr.txt Use proper syntax for replaceables in command docs 2018-05-25 17:16:47 +09:00
git-check-ignore.txt Use proper syntax for replaceables in command docs 2018-05-25 17:16:47 +09:00
git-check-mailmap.txt Use proper syntax for replaceables in command docs 2018-05-25 17:16:47 +09:00
git-check-ref-format.txt Doc/check-ref-format: clarify information about @{-N} syntax 2017-12-19 10:00:45 -08:00
git-checkout-index.txt doc: drop author/documentation sections from most pages 2011-03-11 10:59:16 -05:00
git-checkout.txt Merge branch 'dl/branch-from-3dot-merge-base' 2019-05-19 16:45:28 +09:00
git-cherry-pick.txt cherry-pick/revert: add scissors line on merge conflict 2019-04-19 12:05:36 +09:00
git-cherry.txt
git-citool.txt
git-clean.txt git-clean.txt: clarify ignore pattern files 2019-03-08 09:11:21 +09:00
git-clone.txt clone: send server options when using protocol v2 2019-04-18 10:53:51 +09:00
git-column.txt git-column.txt: fix section header 2018-12-26 15:29:30 -08:00
git-commit-graph.txt Doc: refer to the "commit-graph file" with dash 2018-09-27 15:29:12 -07:00
git-commit-tree.txt commit-tree: utilize parse-options api 2019-03-08 10:31:24 +09:00
git-commit.txt git-commit.txt: better description what it does 2019-02-04 10:00:01 -08:00
git-config.txt Merge branch 'ma/asciidoctor-fixes-more' 2019-04-16 19:28:04 +09:00
git-count-objects.txt
git-credential-cache--daemon.txt
git-credential-cache.txt Use proper syntax for replaceables in command docs 2018-05-25 17:16:47 +09:00
git-credential-store.txt Use proper syntax for replaceables in command docs 2018-05-25 17:16:47 +09:00
git-credential.txt
git-cvsexportcommit.txt
git-cvsimport.txt
git-cvsserver.txt Use proper syntax for replaceables in command docs 2018-05-25 17:16:47 +09:00
git-daemon.txt doc: format pathnames and URLs as monospace. 2019-03-13 11:14:22 +09:00
git-describe.txt describe doc: remove '7-char' abbreviation reference 2019-04-08 17:24:51 +09:00
git-diff-files.txt
git-diff-index.txt doc: keep first level section header in upper case 2018-05-02 17:03:33 +09:00
git-diff-tree.txt Documentation/git-diff-tree.txt: fix formatting 2019-04-01 15:17:47 +09:00
git-diff.txt doc: tidy asciidoc style 2019-01-23 11:37:29 -08:00
git-difftool.txt difftool: fallback on merge.guitool 2019-05-13 23:11:59 +09:00
git-fast-export.txt fast-export: add a --show-original-ids option to show original names 2018-11-17 18:43:52 +09:00
git-fast-import.txt Merge branch 'ab/gc-docs' 2019-04-25 16:41:18 +09:00
git-fetch-pack.txt Documentation: fix several one-character-off spelling errors 2018-04-09 14:15:02 +09:00
git-fetch.txt doc: tidy asciidoc style 2019-01-23 11:37:29 -08:00
git-filter-branch.txt doc: format pathnames and URLs as monospace. 2019-03-13 11:14:22 +09:00
git-fmt-merge-msg.txt config.txt: move fmt-merge-msg-config.txt to config/ 2018-10-29 10:17:01 +09:00
git-for-each-ref.txt ref-filter: add docs for new options 2018-12-28 10:08:11 -08:00
git-format-patch.txt doc: tidy asciidoc style 2019-01-23 11:37:29 -08:00
git-fsck-objects.txt
git-fsck.txt Merge branch 'jk/fsck-doc' 2019-03-20 15:16:06 +09:00
git-gc.txt gc docs: remove incorrect reference to gc.auto=0 2019-04-08 17:01:10 +09:00
git-get-tar-commit-id.txt
git-grep.txt Documentation: turn middle-of-line tabs into spaces 2019-03-07 09:25:32 +09:00
git-gui.txt
git-hash-object.txt
git-help.txt doc: format pathnames and URLs as monospace. 2019-03-13 11:14:22 +09:00
git-http-backend.txt Documentation: turn middle-of-line tabs into spaces 2019-03-07 09:25:32 +09:00
git-http-fetch.txt http-fetch: make -a standard behaviour 2018-04-24 10:55:02 +09:00
git-http-push.txt doc: keep first level section header in upper case 2018-05-02 17:03:33 +09:00
git-imap-send.txt git-imap-send.txt: move imap.* to a separate file 2018-10-29 10:17:02 +09:00
git-index-pack.txt doc: keep first level section header in upper case 2018-05-02 17:03:33 +09:00
git-init-db.txt
git-init.txt Merge branch 'km/init-doc-typofix' 2019-02-06 22:05:21 -08:00
git-instaweb.txt git-instaweb: add Python builtin http.server support 2019-01-28 10:57:44 -08:00
git-interpret-trailers.txt interpret-trailers.txt: start the desc line with a capital letter 2019-04-01 15:49:47 +09:00
git-log.txt Add 'human' date format documentation 2019-01-22 14:16:17 -08:00
git-ls-files.txt doc/ls-files: put nested list for "-t" option into block 2019-04-23 10:25:04 +09:00
git-ls-remote.txt Documentation: turn middle-of-line tabs into spaces 2019-03-07 09:25:32 +09:00
git-ls-tree.txt doc: format pathnames and URLs as monospace. 2019-03-13 11:14:22 +09:00
git-mailinfo.txt
git-mailsplit.txt
git-merge-base.txt doc: fix ASCII art tab spacing 2018-10-23 12:23:09 +09:00
git-merge-file.txt
git-merge-index.txt
git-merge-one-file.txt
git-merge-tree.txt
git-merge.txt merge: tweak --rerere-autoupdate documentation 2019-03-18 10:24:58 +09:00
git-mergetool--lib.txt mergetool: use get_merge_tool function 2019-05-13 23:11:59 +09:00
git-mergetool.txt mergetool: fallback to tool when guitool unavailable 2019-05-13 23:11:59 +09:00
git-mktag.txt
git-mktree.txt Documentation: normalize spelling of 'normalised' 2018-04-09 14:15:07 +09:00
git-multi-pack-index.txt multi-pack-index: add 'verify' verb 2018-09-17 13:49:38 -07:00
git-mv.txt
git-name-rev.txt doc: keep first level section header in upper case 2018-05-02 17:03:33 +09:00
git-notes.txt Documentation: turn middle-of-line tabs into spaces 2019-03-07 09:25:32 +09:00
git-p4.txt doc: tidy asciidoc style 2019-01-23 11:37:29 -08:00
git-pack-objects.txt list-objects: consume sparse tree walk 2019-01-17 13:44:39 -08:00
git-pack-redundant.txt
git-pack-refs.txt
git-parse-remote.txt
git-patch-id.txt doc: remove unsupported parameter from patch-id 2017-07-28 14:41:32 -07:00
git-prune-packed.txt
git-prune.txt doc: keep first level section header in upper case 2018-05-02 17:03:33 +09:00
git-pull.txt docs: say that --rebase=preserve is deprecated 2019-05-28 13:22:34 -07:00
git-push.txt push doc: document the DWYM behavior pushing to unqualified <dst> 2018-11-14 15:27:56 +09:00
git-quiltimport.txt git-quiltimport: add --keep-non-patch option 2019-01-07 15:29:34 -08:00
git-range-diff.txt range-diff doc: add a section about output stability 2018-11-12 12:05:38 +09:00
git-read-tree.txt Merge branch 'nd/checkout-m' 2019-04-25 16:41:14 +09:00
git-rebase.txt Merge branch 'js/rebase-deprecate-preserve-merges' 2019-05-30 10:50:45 -07:00
git-receive-pack.txt doc: keep first level section header in upper case 2018-05-02 17:03:33 +09:00
git-reflog.txt reflog expire: cover reflog from all worktrees 2018-10-22 13:32:54 +09:00
git-remote-ext.txt Merge branch 'js/check-docs-exe' 2019-04-22 11:14:46 +09:00
git-remote-fd.txt docs: move gitremote-helpers into section 7 2019-04-01 14:00:53 +09:00
git-remote-helpers.txto docs: move gitremote-helpers into section 7 2019-04-01 14:00:53 +09:00
git-remote.txt Merge branch 'nd/remote-update-doc' 2018-06-04 21:39:49 +09:00
git-repack.txt Merge branch 'cc/delta-islands' 2018-09-17 13:53:55 -07:00
git-replace.txt replace: introduce --convert-graft-file 2018-04-30 11:12:30 +09:00
git-request-pull.txt doc: keep first level section header in upper case 2018-05-02 17:03:33 +09:00
git-rerere.txt rerere doc: quote rerere.enabled 2019-04-08 17:23:25 +09:00
git-reset.txt Merge branch 'dl/reset-doc-no-wrt-abbrev' 2019-04-10 02:14:21 +09:00
git-rev-list.txt rev-list: add list-objects filtering support 2017-11-22 14:11:57 +09:00
git-rev-parse.txt Use proper syntax for replaceables in command docs 2018-05-25 17:16:47 +09:00
git-revert.txt cherry-pick/revert: add scissors line on merge conflict 2019-04-19 12:05:36 +09:00
git-rm.txt treewide: correct several "up-to-date" to "up to date" 2017-08-23 12:17:22 -07:00
git-send-email.txt doc: tidy asciidoc style 2019-01-23 11:37:29 -08:00
git-send-pack.txt doc: keep first level section header in upper case 2018-05-02 17:03:33 +09:00
git-sh-i18n--envsubst.txt
git-sh-i18n.txt
git-sh-setup.txt
git-shell.txt doc: keep first level section header in upper case 2018-05-02 17:03:33 +09:00
git-shortlog.txt git-[short]log.txt: unify quoted standalone -- 2018-04-18 12:49:26 +09:00
git-show-branch.txt Documentation/git-show-branch: avoid literal {apostrophe} 2019-04-10 12:05:03 +09:00
git-show-index.txt show-index: update documentation for index v2 2018-05-29 00:28:22 +09:00
git-show-ref.txt git-show-ref.txt: fix order of flags 2019-01-10 10:29:05 -08:00
git-show.txt Use proper syntax for replaceables in command docs 2018-05-25 17:16:47 +09:00
git-stage.txt
git-stash.txt stash: mention options in show synopsis 2019-03-07 09:41:40 +09:00
git-status.txt Documentation/git-status: fix titles in porcelain v2 section 2019-04-01 17:46:26 +09:00
git-stripspace.txt
git-submodule.txt Merge branch 'dl/submodule-set-branch' 2019-04-25 16:41:18 +09:00
git-svn.txt Merge branch 'tz/git-svn-doc-markup-fix' 2019-05-09 00:37:23 +09:00
git-symbolic-ref.txt
git-tag.txt doc: tidy asciidoc style 2019-01-23 11:37:29 -08:00
git-tools.txt
git-unpack-file.txt
git-unpack-objects.txt
git-update-index.txt Merge branch 'jc/update-index-doc' 2018-08-20 11:33:50 -07:00
git-update-ref.txt Merge branch 'ah/doc-updates' into maint 2018-11-21 22:58:07 +09:00
git-update-server-info.txt
git-upload-archive.txt
git-upload-pack.txt doc: tidy asciidoc style 2019-01-23 11:37:29 -08:00
git-var.txt doc: keep first level section header in upper case 2018-05-02 17:03:33 +09:00
git-verify-commit.txt
git-verify-pack.txt
git-verify-tag.txt
git-web--browse.txt doc: format pathnames and URLs as monospace. 2019-03-13 11:14:22 +09:00
git-whatchanged.txt
git-worktree.txt doc: fix typos in man pages 2019-03-18 14:45:21 +09:00
git-write-tree.txt
git.txt trace2: document the supported values of GIT_TRACE2* env variables 2019-05-28 10:20:36 -07:00
gitattributes.txt Merge branch 'ab/doc-misc-typofixes' 2019-04-16 19:28:08 +09:00
gitcli.txt Use proper syntax for replaceables in command docs 2018-05-25 17:16:47 +09:00
gitcore-tutorial.txt treewide: correct several "up-to-date" to "up to date" 2017-08-23 12:17:22 -07:00
gitcredentials.txt doc: clarify gitcredentials path component matching 2018-09-27 15:24:50 -07:00
gitcvs-migration.txt
gitdiffcore.txt log -G: ignore binary files 2018-12-26 14:59:37 -08:00
giteveryday.txt Documentation: spelling and grammar fixes 2018-06-22 14:26:23 -07:00
gitglossary.txt
githooks.txt Merge branch 'bp/post-index-change-hook' 2019-04-25 16:41:11 +09:00
gitignore.txt docs: move core.excludesFile from git-add to gitignore 2019-03-08 09:12:45 +09:00
gitk.txt doc: format pathnames and URLs as monospace. 2019-03-13 11:14:22 +09:00
gitmodules.txt doc: format pathnames and URLs as monospace. 2019-03-13 11:14:22 +09:00
gitnamespaces.txt
gitremote-helpers.txt Merge branch 'js/check-docs-exe' 2019-04-22 11:14:46 +09:00
gitrepository-layout.txt doc: format pathnames and URLs as monospace. 2019-03-13 11:14:22 +09:00
gitrevisions.txt push doc: correct lies about how push refspecs work 2018-08-31 14:04:06 -07:00
gitsubmodules.txt gitsubmodules: align html and nroff lists 2019-05-28 09:42:06 -07:00
gittutorial-2.txt
gittutorial.txt treewide: correct several "up-to-date" to "up to date" 2017-08-23 12:17:22 -07:00
gitweb.conf.txt Merge branch 'cb/doco-mono' 2019-04-22 11:14:45 +09:00
gitweb.txt doc: format pathnames and URLs as monospace. 2019-03-13 11:14:22 +09:00
gitworkflows.txt Merge branch 'km/doc-workflows-typofix' 2018-06-18 10:18:42 -07:00
glossary-content.txt Merge branch 'tg/glossary-overlay' 2019-04-16 19:28:07 +09:00
howto-index.sh
i18n.txt doc: camelCase the i18n config variables to improve readability 2017-07-17 15:11:26 -07:00
install-doc-quick.sh install-doc-quick: allow specifying what ref to install 2017-12-12 16:49:40 -08:00
install-webdoc.sh
line-range-format.txt
lint-gitlink.perl
mailmap.txt
Makefile Merge branch 'js/misc-doc-fixes' 2019-05-09 00:37:27 +09:00
manpage-1.72.xsl
manpage-base-url.xsl.in
manpage-base.xsl
manpage-bold-literal.xsl
manpage-normal.xsl
manpage-quote-apos.xsl
manpage-suppress-sp.xsl
merge-options.txt merge: add scissors line on merge conflict 2019-04-18 13:49:29 +09:00
merge-strategies.txt merge: add merge.renames config setting 2018-05-08 16:19:41 +09:00
pretty-formats.txt Merge branch 'aw/pretty-trailers' 2019-03-07 09:59:52 +09:00
pretty-options.txt
pull-fetch-param.txt fetch doc: correct grammar in --force docs 2018-09-20 09:40:03 -07:00
rev-list-options.txt check_everything_connected: assume alternate ref tips are valid 2019-07-01 10:11:09 -07:00
revisions.txt Merge branch 'dl/rev-tilde-doc-clarify' 2019-05-13 23:50:34 +09:00
sequencer.txt doc: format pathnames and URLs as monospace. 2019-03-13 11:14:22 +09:00
SubmittingPatches doc: format pathnames and URLs as monospace. 2019-03-13 11:14:22 +09:00
texi.xsl
trace2-target-values.txt trace2: update docs to describe system/global config settings 2019-04-16 13:37:07 +09:00
transfer-data-leaks.txt
urls-remotes.txt
urls.txt docs: move gitremote-helpers into section 7 2019-04-01 14:00:53 +09:00
user-manual.conf
user-manual.txt checkout: describe_detached_head: remove ellipsis after committish 2017-12-06 07:32:40 -08:00