From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on dcvr.yhbt.net X-Spam-Level: X-Spam-Status: No, score=-3.9 required=3.0 tests=AWL,BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_PASS,SPF_PASS shortcircuit=no autolearn=ham autolearn_force=no version=3.4.2 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by dcvr.yhbt.net (Postfix) with ESMTP id 30B251F4B4 for ; Sat, 19 Sep 2020 01:43:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726112AbgISBle (ORCPT ); Fri, 18 Sep 2020 21:41:34 -0400 Received: from pb-smtp1.pobox.com ([64.147.108.70]:58267 "EHLO pb-smtp1.pobox.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726009AbgISBle (ORCPT ); Fri, 18 Sep 2020 21:41:34 -0400 Received: from pb-smtp1.pobox.com (unknown [127.0.0.1]) by pb-smtp1.pobox.com (Postfix) with ESMTP id 983076B498; Fri, 18 Sep 2020 21:41:24 -0400 (EDT) (envelope-from junio@pobox.com) DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=pobox.com; h=from:to :subject:date:message-id:mime-version:content-type; s=sasl; bh=t keH0RjhxxunSD+AODxjPOmaN/0=; b=em2a7hBwYYjLt9k32tRQdBd8xsUiiT9ET 4CucaE1TlNTJ5XFGW4lmcaFl2wuleNqdczZbJfiaZhOsta7TJ6ulxsjbxlUt8Su8 zF92GCk652Cjeq1K3G5SeqM5cXxYsQ29jea1ukhuOoLalM0MnYu7vlfHLh6z94As /qfd37FOrU= DomainKey-Signature: a=rsa-sha1; c=nofws; d=pobox.com; h=from:to:subject :date:message-id:mime-version:content-type; q=dns; s=sasl; b=TZ1 ZIWDtddVTx6/VO+DySjAYexyuilxjNdHJ8i6toUplxgZQukz9RTB+jctnMT0uptq e3xfa5P4N+PPrAyhKFxUqoYMlXXSkABWwppJoJcPC7F7YlYePPMkZ5tY5UM4zVTm AJGJqarlpz5BAiwceMBvWPgRWs09quWh7b7lzOe8= Received: from pb-smtp1.nyi.icgroup.com (unknown [127.0.0.1]) by pb-smtp1.pobox.com (Postfix) with ESMTP id 8F7A96B497; Fri, 18 Sep 2020 21:41:24 -0400 (EDT) (envelope-from junio@pobox.com) Received: from pobox.com (unknown [35.190.152.57]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by pb-smtp1.pobox.com (Postfix) with ESMTPSA id CF58F6B496; Fri, 18 Sep 2020 21:41:23 -0400 (EDT) (envelope-from junio@pobox.com) From: Junio C Hamano To: git@vger.kernel.org Subject: What's cooking in git.git (Sep 2020, #05; Fri, 18) X-master-at: 385c171a018f2747b329bcfa6be8eda1709e5abd X-next-at: 8d73e042082d7476596b06e00a6c3d1828fa6b49 Date: Fri, 18 Sep 2020 18:41:23 -0700 Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Pobox-Relay-ID: 39C67DE6-FA19-11EA-B324-01D9BED8090B-77302942!pb-smtp1.pobox.com Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org Here are the topics that have been cooking. Commits prefixed with '-' are only in 'seen' (formerly 'pu'---proposed updates) while commits prefixed with '+' are in 'next'. The ones marked with '.' do not appear in any of the integration branches, but I am still holding onto them. You can find the changes described here in the integration branches of the repositories listed at http://git-blame.blogspot.com/p/git-public-repositories.html -------------------------------------------------- [Graduated to 'master'] * al/t3200-back-on-a-branch (2020-09-08) 1 commit (merged to 'next' on 2020-09-09 at 833e2fc60c) + t3200: clean side effect of git checkout --orphan Test fix. * ea/blame-use-oideq (2020-09-08) 1 commit (merged to 'next' on 2020-09-09 at babefe4727) + blame.c: replace instance of !oidcmp for oideq Code cleanup. * es/wt-add-detach (2020-09-06) 3 commits (merged to 'next' on 2020-09-10 at abd83f90e7) + git-worktree.txt: discuss branch-based vs. throwaway worktrees + worktree: teach `add` to recognize -d as shorthand for --detach + git-checkout.txt: document -d short option for --detach "git worktree add" learns that the "-d" is a synonym to "--detach" option to create a new worktree without being on a branch. * hn/refs-ref-log-only-bit (2020-09-08) 1 commit (merged to 'next' on 2020-09-09 at f729cb2c81) + refs: move REF_LOG_ONLY to refs-internal.h A bit of API reshuffling to make sure stuff common to all backends are not defined only in files backend. * jc/add-i-use-builtin-experimental (2020-09-08) 1 commit (merged to 'next' on 2020-09-09 at abcb7515dc) + add -i: use the built-in version when feature.experimental is set The "add -i/-p" machinery has been written in C but it is not used by default yet. It is made default to those who are participating in feature.experimental experiment. * jc/dist-tarball-tweak (2020-09-09) 1 commit (merged to 'next' on 2020-09-10 at 36cbe7ee9e) + Makefile: allow extra tweaking of distribution tarball Allow maintainers to tweak $(TAR) invocations done while making distribution tarballs. * jc/quote-path-cleanup (2020-09-10) 7 commits (merged to 'next' on 2020-09-10 at 3bfde81846) + quote: turn 'nodq' parameter into a set of flags + quote: rename misnamed sq_lookup[] to cq_lookup[] + wt-status: consistently quote paths in "status --short" output + quote_path: code clarification + quote_path: optionally allow quoting a path with SP in it + quote_path: give flags parameter to quote_path() + quote_path: rename quote_path_relative() to quote_path() "git status --short" quoted a path with SP in it when tracked, but not those that are untracked, ignored or unmerged. They are all shown quoted consistently. * jk/add-i-fixes (2020-09-08) 2 commits (merged to 'next' on 2020-09-09 at 46ea071a7a) + add--interactive.perl: specify --no-color explicitly + add-patch: fix inverted return code of repo_read_index() "add -i/-p" fixes. * mf/submodule-summary-with-correct-repository (2020-06-24) 2 commits (merged to 'next' on 2020-09-10 at 7853fe7e12) + submodule: use submodule repository when preparing summary + revision: use repository from rev_info when parsing commits "git diff/show" on a change that involves a submodule used to read the information on commits in the submodule from a wrong repository and gave a wrong information when the commit-graph is involved. cf. * mt/config-fail-nongit-early (2020-09-09) 1 commit (merged to 'next' on 2020-09-10 at 6f77f65b4e) + config: complain about --worktree outside of a git repo Unlike "git config --local", "git config --worktree" did not fail early and cleanly when started outside a git repository. * os/collect-changed-submodules-optim (2020-09-06) 1 commit (merged to 'next' on 2020-09-10 at b6d9ed060e) + submodule: suppress checking for file name and ref ambiguity for object ids Optimization around submodule handling. * pb/clang-json-compilation-database (2020-09-06) 1 commit (merged to 'next' on 2020-09-09 at 9f5ea136f1) + Makefile: add support for generating JSON compilation database Developer support. * pw/add-p-leakfix (2020-09-08) 1 commit (merged to 'next' on 2020-09-09 at 4206d0503c) + add -p: fix memory leak Leakfix. * rs/misc-cleanups (2020-09-06) 3 commits (merged to 'next' on 2020-09-09 at 4a19ea9672) + pack-bitmap-write: use hashwrite_be32() in write_hash_cache() + midx: use hashwrite_u8() in write_midx_header() + fast-import: use write_pack_header() Misc cleanups. * rs/parallel-read-cache-fix (2020-09-06) 1 commit (merged to 'next' on 2020-09-09 at 92953a75c4) + read-cache: fix mem-pool allocation for multi-threaded index loading A follow-up fix to a topic already in 'master'. * rs/refspec-leakfix (2020-09-06) 2 commits (merged to 'next' on 2020-09-09 at 10741e90a5) + refspec: add and use refspec_appendf() + push: release strbufs used for refspec formatting Leakfix. * so/log-tree-diff-cleanup (2020-09-06) 2 commits (merged to 'next' on 2020-09-09 at f8744b8e8a) + log_tree_diff: get rid of extra check for NULL + log_tree_diff: get rid of code duplication for first_parent_only Code cleanup. -------------------------------------------------- [New Topics] * cs/don-t-pretend-a-failed-remote-set-head-succeeded (2020-09-17) 1 commit (merged to 'next' on 2020-09-18 at 51f73ca6dc) + remote: don't show success message when set-head fails "git remote set-head" that failed still said something that hints the operation went through, which was misleading. Will merge to 'master'. * dl/diff-merge-base (2020-09-17) 10 commits - contrib/completion: complete `git diff --merge-base` - builtin/diff-tree: learn --merge-base - builtin/diff-index: learn --merge-base - t4068: add --merge-base tests - diff-lib: define diff_get_merge_base() - diff-lib: accept option flags in run_diff_index() - contrib/completion: extract common diff/difftool options - git-diff.txt: backtick quote command text - git-diff-index.txt: make --cached description a proper sentence - t4068: remove unnecessary >tmp "git diff A...B" learned "git diff --merge-base A B", which is a longer short-hand to say the same thing. Expecting a reroll. cf. <20200917181303.GA108156@coredump.intra.peff.net>, , etc. * jk/dont-count-existing-objects-twice (2020-09-17) 1 commit (merged to 'next' on 2020-09-18 at 73b30558b9) + packfile: actually set approximate_object_count_valid There is a logic to estimate how many objects are in the repository, which is mean to run once per process invocation, but it ran every time the estimated value was requested. Will merge to 'master'. * dl/complete-format-patch-recent-features (2020-09-17) 1 commit (merged to 'next' on 2020-09-18 at c0ec1f7569) + contrib/completion: complete options that take refs for format-patch Update to command line completion (in contrib/) Will merge to 'master'. * js/ignore-cmake-build-artifacts (2020-09-17) 1 commit - cmake: ignore generated files Running CMake based build with VS (in contrib/) from the top-level of the working tree leaves extra build crufts behind. Add patterns to .gitignore Expecting a resolution in a better way. cf. It turns out that these crufts are visible only when the CMake based build procedure is used against the best practice. A better alternative may be to prominently describe the recommended way to use the CMake-based build procedure. * hx/push-atomic-with-cert (2020-09-18) 1 commit - send-pack: run GPG after atomic push checking "git push" that wants to be atomic and wants to send push certificate learned not to prepare and sign the push certificate when it fails the local check (hence due to atomicity it is known that no certificate is needed). Expecting a reroll. cf. -------------------------------------------------- [Stalled] * vv/send-email-with-less-secure-apps-access (2020-08-29) 1 commit - Documentation/git-send-email.txt: Mention less secure app access might need to enable. Doc update. Expecting a reroll. cf. cf. * jc/war-on-dashed-git (2020-08-27) 1 commit - git: catch an attempt to run "git-foo" The first step to remove on-disk binaries for built-in subcommands by soliciting objections. On hold for now. * dr/push-remoteref-fix (2020-04-23) 1 commit - remote.c: fix handling of %(push:remoteref) The "%(push:remoteref)" placeholder in the "--format=" argument of "git format-patch" (and friends) only showed what got explicitly configured, not what ref at the receiving end would be updated when "git push" was used, as it ignored the default behaviour (e.g. update the same ref as the source). Discard for now. cf. cf. <20200911214358.acl3hy2e763begoo@feanor> * mk/use-size-t-in-zlib (2018-10-15) 1 commit - zlib.c: use size_t for size The wrapper to call into zlib followed our long tradition to use "unsigned long" for sizes of regions in memory, which have been updated to use "size_t". -------------------------------------------------- [Cooking] * kk/build-portability-fix (2020-09-09) 1 commit (merged to 'next' on 2020-09-16 at 63f2672632) + Fit to Plan 9's ANSI/POSIX compatibility layer Portability tweak for some shell scripts used while building. Will merge to 'master'. * al/ref-filter-merged-and-no-merged (2020-09-18) 5 commits (merged to 'next' on 2020-09-18 at cc2a0039f3) + Doc: prefer more specific file name + ref-filter: make internal reachable-filter API more precise (merged to 'next' on 2020-09-16 at b04e306660) + ref-filter: allow merged and no-merged filters + Doc: cover multiple contains/no-contains filters + t3201: test multiple branch filter combinations "git for-each-ref" and friends that list refs used to allow only one --merged or --no-merged to filter them; they learned to take combination of both kind of filtering. Will merge to 'master'. * bc/faq-misc (2020-09-14) 3 commits - docs: explain how to deal with files that are always modified - docs: explain why reverts are not always applied on merge - docs: explain why squash merges are broken with long-running branches More FAQ entries. Expecting a reroll. cf. <20200913171206.GO241078@camp.crustytoothpaste.net> * sb/clone-origin (2020-09-11) 4 commits - clone: allow configurable default for `-o`/`--origin` - clone: validate --origin option before use - clone: call git_config before parse_options - clone: add tests for --template and some disallowed option pairs "git clone" learned clone.defaultremotename configuration variable to customize what nickname to use to call the remote the repository was cloned from. Expecting an update. * sk/force-if-includes (2020-09-14) 8 commits - SQUASH??? - t: add tests for "force-if-includes" - doc: add reference for "--[no-]force-if-includes" - builtin/push: add option "--[no-]force-if-includes" - transport-helper: update ref status for "force-if-includes" - send-pack: check ref status for "force-if-includes" - transport: add flag for "--[no-]force-if-includes" - remote: add reflog check for "force-if-includes" * ab/mediawiki-fixes (2020-09-16) 15 commits - remote-mediawiki tests: annotate failing tests - remote-mediawiki: fix duplicate revisions being imported - remote-mediawiki tests: use CLI installer - remote-mediawiki tests: use inline PerlIO for readability - remote-mediawiki tests: replace deprecated Perl construct - remote-mediawiki tests: use a more idiomatic dispatch table - remote-mediawiki tests: use "$dir/" instead of "$dir." - remote-mediawiki tests: change `[]` to `test` - remote-mediawiki tests: guard test_cmp with test_path_is_file - remote-mediawiki tests: use test_cmp in tests - remote-mediawiki tests: use a 10 character password - remote-mediawiki tests: use the login/password variables - remote-mediawiki doc: bump recommended PHP version to 7.3 - remote-mediawiki doc: link to MediaWiki's current version - remote-mediawiki doc: correct link to GitHub project Modernization and fixes to MediaWiki remote backend. Expecting a reroll. * ar/fetch-ipversion-in-all (2020-09-15) 1 commit - fetch: pass --ipv4 and --ipv6 options to sub-fetches "git fetch --all --ipv4/--ipv6" forgot to pass the protocol options to instances of the "git fetch" that talk to individual remotes, which has been corrected. Will merge to 'next'. * ar/fetch-transfer-ipversion (2020-09-16) 1 commit - config: option transfer.ipversion to set transport protocol version for network fetches Adds transfer.ipversion configuration variable. Needs more work. * bc/clone-with-git-default-hash-fix (2020-09-15) 1 commit - builtin/clone: avoid failure with GIT_DEFAULT_HASH "git clone" that clones from SHA-1 repository, while GIT_DEFAULT_HASH set to use SHA-256 already, resulted in an unusable repository that half-claims to be SHA-256 repository with SHA-1 objects and refs. This has been corrected. Expecting a reroll. * cd/commit-graph-doc (2020-09-15) 1 commit (merged to 'next' on 2020-09-16 at b0816b6eb0) + commit-graph-format.txt: fix no-parent value Doc update. Will merge to 'master'. * hn/reftable (2020-09-16) 13 commits - reftable: "test-tool dump-reftable" command. - reftable: rest of library - reftable: file level tests - reftable: read reftable files - reftable: write reftable files - reftable: a generic binary tree implementation - reftable: reading/writing blocks - reftable: (de)serialization for the polymorphic record type. - reftable: utility functions - reftable: add a barebones unittest framework - vcxproj: adjust for the reftable changes - reftable: define the public API - reftable: add LICENSE * bc/rev-parse-path-format (2020-09-08) 1 commit - rev-parse: add option for absolute or relative path formatting "git rev-parse" can be explicitly told to give output as absolute or relative path. * ds/maintenance-part-3 (2020-09-17) 7 commits - maintenance: add troubleshooting guide to docs - maintenance: recommended schedule in register/start - maintenance: add start/stop subcommands - maintenance: add [un]register subcommands - for-each-repo: run subcommands on configured repos - maintenance: add --schedule option and config - maintenance: optionally skip --auto process (this branch uses ds/maintenance-part-1 and ds/maintenance-part-2.) Parts of "git maintenance" to ease writing crontab entries (and other scheduling system configuration) for it. * es/format-patch-interdiff-cleanup (2020-09-08) 3 commits (merged to 'next' on 2020-09-16 at d919bb3d1f) + format-patch: use 'origin' as start of current-series-range when known + diff-lib: tighten show_interdiff()'s interface + diff: move show_interdiff() from its own file to diff-lib Code cleanup and teach "format-patch --range-diff= ..HEAD" not ignore when is a single version. Will merge to 'master'. * os/fetch-submodule-optim (2020-09-06) 1 commit (merged to 'next' on 2020-09-16 at fa39e3f211) + fetch: do not look for submodule changes in unchanged refs Optimization around submodule handling. Will merge to 'master'. * pw/add-p-edit-ita-path (2020-09-09) 1 commit (merged to 'next' on 2020-09-16 at 7540ed3c0e) + add -p: fix editing of intent-to-add paths "add -p" did not allow editing paths that were only added in intent. Will merge to 'master'. * hn/refs-trace-backend (2020-09-09) 1 commit (merged to 'next' on 2020-09-16 at f2e065ec17) + refs: add GIT_TRACE_REFS debugging mechanism Developer support. Will merge to 'master'. * tb/bloom-improvements (2020-09-18) 13 commits - commit-graph: introduce 'commitGraph.maxNewFilters' - builtin/commit-graph.c: introduce '--max-new-filters=' - commit-graph: rename 'split_commit_graph_opts' - bloom: encode out-of-bounds filters as non-empty - bloom/diff: properly short-circuit on max_changes - bloom: use provided 'struct bloom_filter_settings' - bloom: split 'get_bloom_filter()' in two - commit-graph.c: store maximum changed paths - commit-graph: respect 'commitGraph.readChangedPaths' - t/helper/test-read-graph.c: prepare repo settings - commit-graph: pass a 'struct repository *' in more places - t4216: use an '&&'-chain - commit-graph: introduce 'get_bloom_filter_settings()' "git commit-graph write" learned to limit the number of bloom filters that are computed from scratch with the --max-new-filters option. Will merge to 'next'. * es/config-hooks (2020-09-09) 9 commits - run_commit_hook: take strvec instead of varargs - commit: use config-based hooks - hook: replace run-command.h:find_hook - hook: add 'run' subcommand - parse-options: parse into strvec - hook: add --porcelain to list command - hook: add list command - hook: scaffolding for git-hook subcommand - doc: propose hooks managed by the config The "hooks defined in config" topic. * ls/mergetool-meld-auto-merge (2020-09-16) 1 commit (merged to 'next' on 2020-09-16 at 01985a671b) + mergetool: allow auto-merge for meld to follow the vim-diff behavior The 'meld' backend of the "git mergetool" learned to give the underlying 'meld' the '--auto-merge' option, which would help reduce the amount of text that requires manual merging. Will merge to 'master'. * mt/grep-sparse-checkout (2020-09-10) 9 commits - config: add setting to ignore sparsity patterns in some cmds - grep: honor sparse checkout patterns - config: correctly read worktree configs in submodules - config: make do_git_config_sequence receive a 'struct repository' - t/helper/test-config: unify exit labels - t/helper/test-config: diagnose missing arguments - t/helper/test-config: be consistent with exit codes - t1308-config-set: avoid false positives when using test-config - doc: grep: unify info on configuration variables "git grep" has been tweaked to be limited to the sparse checkout paths. * ew/decline-core-abbrev (2020-09-01) 1 commit - core.abbrev disables abbreviations Allow the configuration to specify no abbreviation regardless of the hash algorithm. Expecting a reroll. The intent is very good. * mr/bisect-in-c-2 (2020-08-31) 13 commits - bisect--helper: retire `--bisect-autostart` subcommand - bisect--helper: retire `--write-terms` subcommand - bisect--helper: retire `--check-expected-revs` subcommand - bisect--helper: reimplement `bisect_state` & `bisect_head` shell functions in C - bisect--helper: retire `--next-all` subcommand - bisect--helper: retire `--bisect-clean-state` subcommand - bisect--helper: finish porting `bisect_start()` to C - bisect--helper: reimplement `bisect_next` and `bisect_auto_next` shell functions in C - bisect: call 'clear_commit_marks_all()' in 'bisect_next_all()' - bisect--helper: reimplement `bisect_autostart` shell function in C - bisect--helper: introduce new `write_in_file()` function - bisect--helper: use '-res' in 'cmd_bisect__helper' return - bisect--helper: BUG() in cmd_*() on invalid subcommand Rewrite of the "git bisect" script in C continues. At v7; getting close cf. * js/no-builtins-on-disk-option (2020-08-24) 3 commits - ci: stop linking built-ins to the dashed versions - install: optionally skip linking/copying the built-ins - msvc: copy the correct `.pdb` files in the Makefile target `install` The installation procedure learned to optionally omit "git-foo" executable files for each 'foo' built-in subcommand, which are only required by old timers that still rely on the age old promise that prepending "git --exec-path" output to PATH early in their script will keep the "git-foo" calls they wrote working. The old attempt to remove these executables from the disk failed in the 1.6 era; it may be worth attempting again, but I think it is worth to keep this topic separate from such a policy change to help it graduate early. Expecting a reroll to update log message for the last one. as it confused at least two reviewers. cf. cf. <20200903104537.GA27325@szeder.dev> * jt/threaded-index-pack (2020-09-08) 7 commits (merged to 'next' on 2020-09-16 at 8542385cc0) + index-pack: make quantum of work smaller + index-pack: make resolve_delta() assume base data + index-pack: calculate {ref,ofs}_{first,last} early + index-pack: remove redundant child field + index-pack: unify threaded and unthreaded code + index-pack: remove redundant parameter + Documentation: deltaBaseCacheLimit is per-thread "git index-pack" learned to resolve deltified objects with greater parallelism. Will merge to 'master'. * jk/refspecs-negative (2020-09-18) 2 commits - SQUASH??? - refspec: add support for negative refspecs "negative refspecs" Expecting a reroll. cf. cf. * jx/proc-receive-hook (2020-08-27) 10 commits (merged to 'next' on 2020-09-18 at 344c89be7e) + doc: add documentation for the proc-receive hook + transport: parse report options for tracking refs + t5411: test updates of remote-tracking branches + receive-pack: new config receive.procReceiveRefs + doc: add document for capability report-status-v2 + New capability "report-status-v2" for git-push + receive-pack: feed report options to post-receive + receive-pack: add new proc-receive hook + t5411: add basic test cases for proc-receive hook + transport: not report a non-head push as a branch "git receive-pack" that accepts requests by "git push" learned to outsource most of the ref updates to the new "proc-receive" hook. Will merge to 'master'. * ds/maintenance-part-2 (2020-09-17) 8 commits - maintenance: add incremental-repack auto condition - maintenance: auto-size incremental-repack batch - maintenance: add incremental-repack task - midx: use start_delayed_progress() - midx: enable core.multiPackIndex by default - maintenance: create auto condition for loose-objects - maintenance: add loose-objects task - maintenance: add prefetch task (this branch is used by ds/maintenance-part-3; uses ds/maintenance-part-1.) "git maintenance", an extended big brother of "git gc", continues to evolve. * ds/maintenance-part-1 (2020-09-17) 11 commits (merged to 'next' on 2020-09-18 at 4c367d3cf6) + maintenance: add trace2 regions for task execution + maintenance: add auto condition for commit-graph task + maintenance: use pointers to check --auto + maintenance: create maintenance..enabled config + maintenance: take a lock on the objects directory + maintenance: add --task option + maintenance: add commit-graph task + maintenance: initialize task array + maintenance: replace run_auto_gc() + maintenance: add --quiet option + maintenance: create basic maintenance runner (this branch is used by ds/maintenance-part-2 and ds/maintenance-part-3.) A "git gc"'s big brother has been introduced to take care of more repository maintenance tasks, not limited to the object database cleaning. Will merge to 'master'.