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2018-08-02Merge branch 'jt/commit-graph-per-object-store'Libravatar Junio C Hamano1-3/+3
The singleton commit-graph in-core instance is made per in-core repository instance. * jt/commit-graph-per-object-store: commit-graph: add repo arg to graph readers commit-graph: store graph in struct object_store commit-graph: add free_commit_graph commit-graph: add missing forward declaration object-store: add missing include commit-graph: refactor preparing commit graph
2018-08-02Merge branch 'sb/object-store-lookup'Libravatar Junio C Hamano1-30/+50
lookup_commit_reference() and friends have been updated to find in-core object for a specific in-core repository instance. * sb/object-store-lookup: (32 commits) commit.c: allow lookup_commit_reference to handle arbitrary repositories commit.c: allow lookup_commit_reference_gently to handle arbitrary repositories tag.c: allow deref_tag to handle arbitrary repositories object.c: allow parse_object to handle arbitrary repositories object.c: allow parse_object_buffer to handle arbitrary repositories commit.c: allow get_cached_commit_buffer to handle arbitrary repositories commit.c: allow set_commit_buffer to handle arbitrary repositories commit.c: migrate the commit buffer to the parsed object store commit-slabs: remove realloc counter outside of slab struct commit.c: allow parse_commit_buffer to handle arbitrary repositories tag: allow parse_tag_buffer to handle arbitrary repositories tag: allow lookup_tag to handle arbitrary repositories commit: allow lookup_commit to handle arbitrary repositories tree: allow lookup_tree to handle arbitrary repositories blob: allow lookup_blob to handle arbitrary repositories object: allow lookup_object to handle arbitrary repositories object: allow object_as_type to handle arbitrary repositories tag: add repository argument to deref_tag tag: add repository argument to parse_tag_buffer tag: add repository argument to lookup_tag ...
2018-08-02Merge branch 'ds/commit-graph-fsck'Libravatar Junio C Hamano1-2/+8
"git fsck" learns to make sure the optional commit-graph file is in a sane state. * ds/commit-graph-fsck: (23 commits) coccinelle: update commit.cocci commit-graph: update design document gc: automatically write commit-graph files commit-graph: add '--reachable' option commit-graph: use string-list API for input fsck: verify commit-graph commit-graph: verify contents match checksum commit-graph: test for corrupted octopus edge commit-graph: verify commit date commit-graph: verify generation number commit-graph: verify parent list commit-graph: verify root tree OIDs commit-graph: verify objects exist commit-graph: verify corrupt OID fanout and lookup commit-graph: verify required chunks are present commit-graph: verify catches corrupt signature commit-graph: add 'verify' subcommand commit-graph: load a root tree from specific graph commit: force commit to parse from object database commit-graph: parse commit from chosen graph ...
2018-08-02Merge branch 'bc/object-id'Libravatar Junio C Hamano1-2/+2
Conversion from uchar[40] to struct object_id continues. * bc/object-id: pretty: switch hard-coded constants to the_hash_algo sha1-file: convert constants to uses of the_hash_algo log-tree: switch GIT_SHA1_HEXSZ to the_hash_algo->hexsz diff: switch GIT_SHA1_HEXSZ to use the_hash_algo builtin/merge-recursive: make hash independent builtin/merge: switch to use the_hash_algo builtin/fmt-merge-msg: make hash independent builtin/update-index: simplify parsing of cacheinfo builtin/update-index: convert to using the_hash_algo refs/files-backend: use the_hash_algo for writing refs sha1-name: use the_hash_algo when parsing object names strbuf: allocate space with GIT_MAX_HEXSZ commit: express tree entry constants in terms of the_hash_algo hex: switch to using the_hash_algo tree-walk: replace hard-coded constants with the_hash_algo cache: update object ID functions for the_hash_algo
2018-07-18Merge branch 'sb/object-store-grafts'Libravatar Junio C Hamano1-36/+41
The conversion to pass "the_repository" and then "a_repository" throughout the object access API continues. * sb/object-store-grafts: commit: allow lookup_commit_graft to handle arbitrary repositories commit: allow prepare_commit_graft to handle arbitrary repositories shallow: migrate shallow information into the object parser path.c: migrate global git_path_* to take a repository argument cache: convert get_graft_file to handle arbitrary repositories commit: convert read_graft_file to handle arbitrary repositories commit: convert register_commit_graft to handle arbitrary repositories commit: convert commit_graft_pos() to handle arbitrary repositories shallow: add repository argument to is_repository_shallow shallow: add repository argument to check_shallow_file_for_update shallow: add repository argument to register_shallow shallow: add repository argument to set_alternate_shallow_file commit: add repository argument to lookup_commit_graft commit: add repository argument to prepare_commit_graft commit: add repository argument to read_graft_file commit: add repository argument to register_commit_graft commit: add repository argument to commit_graft_pos object: move grafts to object parser object-store: move object access functions to object-store.h
2018-07-17commit-graph: add repo arg to graph readersLibravatar Jonathan Tan1-3/+3
Add a struct repository argument to the functions in commit-graph.h that read the commit graph. (This commit does not affect functions that write commit graphs.) Because the commit graph functions can now read the commit graph of any repository, the global variable core_commit_graph has been removed. Instead, the config option core.commitGraph is now read on the first time in a repository that a commit is attempted to be parsed using its commit graph. This commit includes a test that exercises the functionality on an arbitrary repository that is not the_repository. Signed-off-by: Jonathan Tan <jonathantanmy@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-07-17Merge branch 'ds/commit-graph-fsck' into jt/commit-graph-per-object-storeLibravatar Junio C Hamano1-2/+8
* ds/commit-graph-fsck: (23 commits) coccinelle: update commit.cocci commit-graph: update design document gc: automatically write commit-graph files commit-graph: add '--reachable' option commit-graph: use string-list API for input fsck: verify commit-graph commit-graph: verify contents match checksum commit-graph: test for corrupted octopus edge commit-graph: verify commit date commit-graph: verify generation number commit-graph: verify parent list commit-graph: verify root tree OIDs commit-graph: verify objects exist commit-graph: verify corrupt OID fanout and lookup commit-graph: verify required chunks are present commit-graph: verify catches corrupt signature commit-graph: add 'verify' subcommand commit-graph: load a root tree from specific graph commit: force commit to parse from object database commit-graph: parse commit from chosen graph ...
2018-07-16commit: express tree entry constants in terms of the_hash_algoLibravatar brian m. carlson1-2/+2
Specify these constants in terms of the size of the hash algorithm currently in use. Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-06-29commit.c: allow lookup_commit_reference to handle arbitrary repositoriesLibravatar Stefan Beller1-2/+2
Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-06-29commit.c: allow lookup_commit_reference_gently to handle arbitrary repositoriesLibravatar Stefan Beller1-4/+4
Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-06-29commit.c: allow get_cached_commit_buffer to handle arbitrary repositoriesLibravatar Stefan Beller1-2/+2
Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-06-29commit.c: allow set_commit_buffer to handle arbitrary repositoriesLibravatar Stefan Beller1-2/+2
Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-06-29commit.c: migrate the commit buffer to the parsed object storeLibravatar Stefan Beller1-6/+23
Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-06-29commit.c: allow parse_commit_buffer to handle arbitrary repositoriesLibravatar Stefan Beller1-5/+5
Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-06-29commit: allow lookup_commit to handle arbitrary repositoriesLibravatar Stefan Beller1-5/+5
Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-06-29tag: add repository argument to deref_tagLibravatar Stefan Beller1-1/+2
Add a repository argument to allow the callers of deref_tag to be more specific about which repository to act on. This is a small mechanical change; it doesn't change the implementation to handle repositories other than the_repository yet. As with the previous commits, use a macro to catch callers passing a repository other than the_repository at compile time. Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-06-29commit: add repository argument to get_cached_commit_bufferLibravatar Stefan Beller1-2/+2
Add a repository argument to allow callers of get_cached_commit_buffer to be more specific about which repository to handle. This is a small mechanical change; it doesn't change the implementation to handle repositories other than the_repository yet. As with the previous commits, use a macro to catch callers passing a repository other than the_repository at compile time. Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-06-29commit: add repository argument to set_commit_bufferLibravatar Stefan Beller1-2/+2
Add a repository argument to allow callers of set_commit_buffer to be more specific about which repository to handle. This is a small mechanical change; it doesn't change the implementation to handle repositories other than the_repository yet. As with the previous commits, use a macro to catch callers passing a repository other than the_repository at compile time. Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-06-29commit: add repository argument to parse_commit_bufferLibravatar Stefan Beller1-2/+2
Add a repository argument to allow the callers of parse_commit_buffer to be more specific about which repository to act on. This is a small mechanical change; it doesn't change the implementation to handle repositories other than the_repository yet. As with the previous commits, use a macro to catch callers passing a repository other than the_repository at compile time. Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-06-29commit: add repository argument to lookup_commitLibravatar Stefan Beller1-3/+4
Add a repository argument to allow callers of lookup_commit to be more specific about which repository to handle. This is a small mechanical change; it doesn't change the implementation to handle repositories other than the_repository yet. As with the previous commits, use a macro to catch callers passing a repository other than the_repository at compile time. Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-06-29commit: add repository argument to lookup_commit_referenceLibravatar Stefan Beller1-3/+3
Add a repository argument to allow callers of lookup_commit_reference to be more specific about which repository to handle. This is a small mechanical change; it doesn't change the implementation to handle repositories other than the_repository yet. As with the previous commits, use a macro to catch callers passing a repository other than the_repository at compile time. Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-06-29commit: add repository argument to lookup_commit_reference_gentlyLibravatar Stefan Beller1-3/+3
Add a repository argument to allow callers of lookup_commit_reference_gently to be more specific about which repository to handle. This is a small mechanical change; it doesn't change the implementation to handle repositories other than the_repository yet. As with the previous commits, use a macro to catch callers passing a repository other than the_repository at compile time. Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-06-29tree: add repository argument to lookup_treeLibravatar Stefan Beller1-1/+1
Add a repository argument to allow the callers of lookup_tree to be more specific about which repository to act on. This is a small mechanical change; it doesn't change the implementation to handle repositories other than the_repository yet. As with the previous commits, use a macro to catch callers passing a repository other than the_repository at compile time. Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-06-29object: add repository argument to object_as_typeLibravatar Stefan Beller1-2/+2
Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-06-29object: add repository argument to lookup_objectLibravatar Stefan Beller1-1/+1
Add a repository argument to allow callers of lookup_object to be more specific about which repository to handle. This is a small mechanical change; it doesn't change the implementation to handle repositories other than the_repository yet. As with the previous commits, use a macro to catch callers passing a repository other than the_repository at compile time. Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-06-29object: add repository argument to parse_objectLibravatar Stefan Beller1-2/+3
Add a repository argument to allow the callers of parse_object to be more specific about which repository to act on. This is a small mechanical change; it doesn't change the implementation to handle repositories other than the_repository yet. As with the previous commits, use a macro to catch callers passing a repository other than the_repository at compile time. Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-06-29Merge branch 'sb/object-store-grafts' into sb/object-store-lookupLibravatar Junio C Hamano1-36/+41
* sb/object-store-grafts: commit: allow lookup_commit_graft to handle arbitrary repositories commit: allow prepare_commit_graft to handle arbitrary repositories shallow: migrate shallow information into the object parser path.c: migrate global git_path_* to take a repository argument cache: convert get_graft_file to handle arbitrary repositories commit: convert read_graft_file to handle arbitrary repositories commit: convert register_commit_graft to handle arbitrary repositories commit: convert commit_graft_pos() to handle arbitrary repositories shallow: add repository argument to is_repository_shallow shallow: add repository argument to check_shallow_file_for_update shallow: add repository argument to register_shallow shallow: add repository argument to set_alternate_shallow_file commit: add repository argument to lookup_commit_graft commit: add repository argument to prepare_commit_graft commit: add repository argument to read_graft_file commit: add repository argument to register_commit_graft commit: add repository argument to commit_graft_pos object: move grafts to object parser object-store: move object access functions to object-store.h
2018-06-27commit: force commit to parse from object databaseLibravatar Derrick Stolee1-2/+8
In anticipation of verifying commit-graph file contents against the object database, create parse_commit_internal() to allow side-stepping the commit-graph file and parse directly from the object database. Due to the use of generation numbers, this method should not be called unless the intention is explicit in avoiding commits from the commit-graph file. Signed-off-by: Derrick Stolee <dstolee@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-06-25Merge branch 'sb/object-store-alloc'Libravatar Junio C Hamano1-1/+14
The conversion to pass "the_repository" and then "a_repository" throughout the object access API continues. * sb/object-store-alloc: alloc: allow arbitrary repositories for alloc functions object: allow create_object to handle arbitrary repositories object: allow grow_object_hash to handle arbitrary repositories alloc: add repository argument to alloc_commit_index alloc: add repository argument to alloc_report alloc: add repository argument to alloc_object_node alloc: add repository argument to alloc_tag_node alloc: add repository argument to alloc_commit_node alloc: add repository argument to alloc_tree_node alloc: add repository argument to alloc_blob_node object: add repository argument to grow_object_hash object: add repository argument to create_object repository: introduce parsed objects field
2018-06-25Merge branch 'ds/commit-graph-lockfile-fix'Libravatar Junio C Hamano1-8/+53
Update to ds/generation-numbers topic. * ds/commit-graph-lockfile-fix: commit-graph: fix UX issue when .lock file exists commit-graph.txt: update design document merge: check config before loading commits commit: use generation number in remove_redundant() commit: add short-circuit to paint_down_to_common() commit: use generation numbers for in_merge_bases() ref-filter: use generation number for --contains commit-graph: always load commit-graph information commit: use generations in paint_down_to_common() commit-graph: compute generation numbers commit: add generation number to struct commit ref-filter: fix outdated comment on in_commit_list
2018-06-25Merge branch 'nd/commit-util-to-slab'Libravatar Junio C Hamano1-2/+10
The in-core "commit" object had an all-purpose "void *util" field, which was tricky to use especially in library-ish part of the code. All of the existing uses of the field has been migrated to a more dedicated "commit-slab" mechanism and the field is eliminated. * nd/commit-util-to-slab: commit.h: delete 'util' field in struct commit merge: use commit-slab in merge remote desc instead of commit->util log: use commit-slab in prepare_bases() instead of commit->util show-branch: note about its object flags usage show-branch: use commit-slab for commit-name instead of commit->util name-rev: use commit-slab for rev-name instead of commit->util bisect.c: use commit-slab for commit weight instead of commit->util revision.c: use commit-slab for show_source sequencer.c: use commit-slab to associate todo items to commits sequencer.c: use commit-slab to mark seen commits shallow.c: use commit-slab for commit depth instead of commit->util describe: use commit-slab for commit names instead of commit->util blame: use commit-slab for blame suspects instead of commit->util commit-slab: support shared commit-slab commit-slab.h: code split
2018-06-13Merge branch 'jk/index-pack-maint'Libravatar Junio C Hamano1-0/+3
"index-pack --strict" has been taught to make sure that it runs the final object integrity checks after making the freshly indexed packfile available to itself. * jk/index-pack-maint: index-pack: correct install_packed_git() args index-pack: handle --strict checks of non-repo packs prepare_commit_graft: treat non-repository as a noop
2018-06-01prepare_commit_graft: treat non-repository as a noopLibravatar Jeff King1-0/+3
The parse_commit_buffer() function consults lookup_commit_graft() to see if we need to rewrite parents. The latter will look at $GIT_DIR/info/grafts. If you're outside of a repository, then this will trigger a BUG() as of b1ef400eec (setup_git_env: avoid blind fall-back to ".git", 2016-10-20). It's probably uncommon to actually parse a commit outside of a repository, but you can see it in action with: cd /not/a/git/repo git index-pack --strict /some/file.pack This works fine without --strict, but the fsck checks will try to parse any commits, triggering the BUG(). We can fix that by teaching the graft code to behave as if there are no grafts when we aren't in a repository. Arguably index-pack (and fsck) are wrong to consider grafts at all. So another solution is to disable grafts entirely for those commands. But given that the graft feature is deprecated anyway, it's not worth even thinking through the ramifications that might have. There is one other corner case I considered here. What should: cd /not/a/git/repo export GIT_GRAFT_FILE=/file/with/grafts git index-pack --strict /some/file.pack do? We don't have a repository, but the user has pointed us directly at a graft file, which we could respect. I believe this case did work that way prior to b1ef400eec. However, fixing it now would be pretty invasive. Back then we would just call into setup_git_env() even without a repository. But these days it actually takes a git_dir argument. So there would be a fair bit of refactoring of the setup code involved. Given the obscurity of this case, plus the fact that grafts are deprecated and probably shouldn't work under index-pack anyway, it's not worth pursuing further. This patch at least un-breaks the common case where you're _not_ using grafts, but we BUG() anyway trying to even find that out. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-05-30Merge branch 'bc/object-id'Libravatar Junio C Hamano1-2/+2
Conversion from uchar[20] to struct object_id continues. * bc/object-id: (42 commits) merge-one-file: compute empty blob object ID add--interactive: compute the empty tree value Update shell scripts to compute empty tree object ID sha1_file: only expose empty object constants through git_hash_algo dir: use the_hash_algo for empty blob object ID sequencer: use the_hash_algo for empty tree object ID cache-tree: use is_empty_tree_oid sha1_file: convert cached object code to struct object_id builtin/reset: convert use of EMPTY_TREE_SHA1_BIN builtin/receive-pack: convert one use of EMPTY_TREE_SHA1_HEX wt-status: convert two uses of EMPTY_TREE_SHA1_HEX submodule: convert several uses of EMPTY_TREE_SHA1_HEX sequencer: convert one use of EMPTY_TREE_SHA1_HEX merge: convert empty tree constant to the_hash_algo builtin/merge: switch tree functions to use object_id builtin/am: convert uses of EMPTY_TREE_SHA1_BIN to the_hash_algo sha1-file: add functions for hex empty tree and blob OIDs builtin/receive-pack: avoid hard-coded constants for push certs diff: specify abbreviation size in terms of the_hash_algo upload-pack: replace use of several hard-coded constants ...
2018-05-23Merge branch 'js/deprecate-grafts'Libravatar Junio C Hamano1-3/+15
The functionality of "$GIT_DIR/info/grafts" has been superseded by the "refs/replace/" mechanism for some time now, but the internal code had support for it in many places, which has been cleaned up in order to drop support of the "grafts" mechanism. * js/deprecate-grafts: Remove obsolete script to convert grafts to replace refs technical/shallow: describe why shallow cannot use replace refs technical/shallow: stop referring to grafts filter-branch: stop suggesting to use grafts Deprecate support for .git/info/grafts Add a test for `git replace --convert-graft-file` replace: introduce --convert-graft-file replace: prepare create_graft() for converting graft files wholesale replace: "libify" create_graft() and callees replace: avoid using die() to indicate a bug commit: Let the callback of for_each_mergetag return on error argv_array: offer to split a string by whitespace
2018-05-23Merge branch 'ds/lazy-load-trees'Libravatar Junio C Hamano1-1/+17
The code has been taught to use the duplicated information stored in the commit-graph file to learn the tree object name for a commit to avoid opening and parsing the commit object when it makes sense to do so. * ds/lazy-load-trees: coccinelle: avoid wrong transformation suggestions from commit.cocci commit-graph: lazy-load trees for commits treewide: replace maybe_tree with accessor methods commit: create get_commit_tree() method treewide: rename tree to maybe_tree
2018-05-22commit: use generation number in remove_redundant()Libravatar Derrick Stolee1-1/+6
The static remove_redundant() method is used to filter a list of commits by removing those that are reachable from another commit in the list. This is used to remove all possible merge- bases except a maximal, mutually independent set. To determine these commits are independent, we use a number of paint_down_to_common() walks and use the PARENT1, PARENT2 flags to determine reachability. Since we only care about reachability and not the full set of merge-bases between 'one' and 'twos', we can use the 'min_generation' parameter to short-circuit the walk. When no commit-graph exists, there is no change in behavior. For a copy of the Linux repository, we measured the following performance improvements: git merge-base v3.3 v4.5 Before: 234 ms After: 208 ms Rel %: -11% git merge-base v4.3 v4.5 Before: 102 ms After: 83 ms Rel %: -19% The experiments above were chosen to demonstrate that we are improving the filtering of the merge-base set. In the first example, more time is spent walking the history to find the set of merge bases before the remove_redundant() call. The starting commits are closer together in the second example, therefore more time is spent in remove_redundant(). The relative change in performance differs as expected. Reported-by: Jakub Narebski <jnareb@gmail.com> Signed-off-by: Derrick Stolee <dstolee@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-05-22commit: add short-circuit to paint_down_to_common()Libravatar Derrick Stolee1-4/+16
When running 'git branch --contains', the in_merge_bases_many() method calls paint_down_to_common() to discover if a specific commit is reachable from a set of branches. Commits with lower generation number are not needed to correctly answer the containment query of in_merge_bases_many(). Add a new parameter, min_generation, to paint_down_to_common() that prevents walking commits with generation number strictly less than min_generation. If 0 is given, then there is no functional change. For in_merge_bases_many(), we can pass commit->generation as the cutoff, and this saves time during 'git branch --contains' queries that would otherwise walk "around" the commit we are inspecting. For a copy of the Linux repository, where HEAD is checked out at v4.13~100, we get the following performance improvement for 'git branch --contains' over the previous commit: Before: 0.21s After: 0.13s Rel %: -38% Signed-off-by: Derrick Stolee <dstolee@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-05-22commit: use generation numbers for in_merge_bases()Libravatar Derrick Stolee1-1/+8
The containment algorithm for 'git branch --contains' is different from that for 'git tag --contains' in that it uses is_descendant_of() instead of contains_tag_algo(). The expensive portion of the branch algorithm is computing merge bases. When a commit-graph file exists with generation numbers computed, we can avoid this merge-base calculation when the target commit has a larger generation number than the initial commits. Performance tests were run on a copy of the Linux repository where HEAD is contained in v4.13 but no earlier tag. Also, all tags were copied to branches and 'git branch --contains' was tested: Before: 60.0s After: 0.4s Rel %: -99.3% Reported-by: Jeff King <peff@peff.net> Signed-off-by: Derrick Stolee <dstolee@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-05-22commit-graph: always load commit-graph informationLibravatar Derrick Stolee1-2/+5
Most code paths load commits using lookup_commit() and then parse_commit(). In some cases, including some branch lookups, the commit is parsed using parse_object_buffer() which side-steps parse_commit() in favor of parse_commit_buffer(). With generation numbers in the commit-graph, we need to ensure that any commit that exists in the commit-graph file has its generation number loaded. Create new load_commit_graph_info() method to fill in the information for a commit that exists only in the commit-graph file. Call it from parse_commit_buffer() after loading the other commit information from the given buffer. Only fill this information when specified by the 'check_graph' parameter. Signed-off-by: Derrick Stolee <dstolee@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-05-22commit: use generations in paint_down_to_common()Libravatar Derrick Stolee1-1/+19
Define compare_commits_by_gen_then_commit_date(), which uses generation numbers as a primary comparison and commit date to break ties (or as a comparison when both commits do not have computed generation numbers). Since the commit-graph file is closed under reachability, we know that all commits in the file have generation at most GENERATION_NUMBER_MAX which is less than GENERATION_NUMBER_INFINITY. This change does not affect the number of commits that are walked during the execution of paint_down_to_common(), only the order that those commits are inspected. In the case that commit dates violate topological order (i.e. a parent is "newer" than a child), the previous code could walk a commit twice: if a commit is reached with the PARENT1 bit, but later is re-visited with the PARENT2 bit, then that PARENT2 bit must be propagated to its parents. Using generation numbers avoids this extra effort, even if it is somewhat rare. Signed-off-by: Derrick Stolee <dstolee@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-05-21merge: use commit-slab in merge remote desc instead of commit->utilLibravatar Nguyễn Thái Ngọc Duy1-2/+10
It's done so that commit->util can be removed. See more explanation in the commit that removes commit->util. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-05-18commit: allow lookup_commit_graft to handle arbitrary repositoriesLibravatar Stefan Beller1-4/+4
Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-05-18commit: allow prepare_commit_graft to handle arbitrary repositoriesLibravatar Stefan Beller1-8/+6
Move the global variable 'commit_graft_prepared' into the object pool and convert the function prepare_commit_graft to work an arbitrary repositories. Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-05-18cache: convert get_graft_file to handle arbitrary repositoriesLibravatar Stefan Beller1-1/+1
This conversion was done without the #define trick used in the earlier series refactoring to have better repository access, because this function is easy to review, as all lines are converted and it has only one caller. Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-05-18commit: convert read_graft_file to handle arbitrary repositoriesLibravatar Brandon Williams1-3/+2
Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-05-18commit: convert register_commit_graft to handle arbitrary repositoriesLibravatar Brandon Williams1-14/+15
Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-05-18commit: convert commit_graft_pos() to handle arbitrary repositoriesLibravatar Brandon Williams1-4/+3
Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-05-18shallow: add repository argument to is_repository_shallowLibravatar Stefan Beller1-1/+1
Add a repository argument to allow callers of is_repository_shallow to be more specific about which repository to handle. This is a small mechanical change; it doesn't change the implementation to handle repositories other than the_repository yet. As with the previous commits, use a macro to catch callers passing a repository other than the_repository at compile time. Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-05-18commit: add repository argument to lookup_commit_graftLibravatar Jonathan Nieder1-2/+2
Add a repository argument to allow callers of lookup_commit_graft to be more specific about which repository to handle. This is a small mechanical change; it doesn't change the implementation to handle repositories other than the_repository yet. As with the previous commits, use a macro to catch callers passing a repository other than the_repository at compile time. Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>