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2019-01-22commit-graph: rename "large edges" to "extra edges"Libravatar SZEDER Gábor1-2/+2
The optional 'Large Edge List' chunk of the commit graph file stores parent information for commits with more than two parents, and the names of most of the macros, variables, struct fields, and functions related to this chunk contain the term "large edges", e.g. write_graph_chunk_large_edges(). However, it's not a really great term, as the edges to the second and subsequent parents stored in this chunk are not any larger than the edges to the first and second parents stored in the "main" 'Commit Data' chunk. It's the number of edges, IOW number of parents, that is larger compared to non-merge and "regular" two-parent merge commits. And indeed, two functions in 'commit-graph.c' have a local variable called 'num_extra_edges' that refer to the same thing, and this "extra edges" term is much better at describing these edges. So let's rename all these references to "large edges" in macro, variable, function, etc. names to "extra edges". There is a GRAPH_OCTOPUS_EDGES_NEEDED macro as well; for the sake of consistency rename it to GRAPH_EXTRA_EDGES_NEEDED. We can do so safely without causing any incompatibility issues, because the term "large edges" doesn't come up in the file format itself in any form (the chunk's magic is {'E', 'D', 'G', 'E'}, there is no 'L' in there), but only in the specification text. The string "large edges", however, does come up in the output of 'git commit-graph read' and in tests looking at its input, but that command is explicitly documented as debugging aid, so we can change its output and the affected tests safely. Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-10-19Merge branch 'ds/commit-graph-leakfix'Libravatar Junio C Hamano1-5/+6
Code clean-up. * ds/commit-graph-leakfix: commit-graph: reduce initial oid allocation builtin/commit-graph.c: UNLEAK variables commit-graph: clean up leaked memory during write
2018-10-16Merge branch 'ds/commit-graph-with-grafts'Libravatar Junio C Hamano1-0/+4
The recently introduced commit-graph auxiliary data is incompatible with mechanisms such as replace & grafts that "breaks" immutable nature of the object reference relationship. Disable optimizations based on its use (and updating existing commit-graph) when these incompatible features are in use in the repository. * ds/commit-graph-with-grafts: commit-graph: close_commit_graph before shallow walk commit-graph: not compatible with uninitialized repo commit-graph: not compatible with grafts commit-graph: not compatible with replace objects test-repository: properly init repo commit-graph: update design document refs.c: upgrade for_each_replace_ref to be a each_repo_ref_fn callback refs.c: migrate internal ref iteration to pass thru repository argument
2018-10-07builtin/commit-graph.c: UNLEAK variablesLibravatar Martin Ågren1-5/+6
`graph_verify()`, `graph_read()` and `graph_write()` do the hard work of `cmd_commit_graph()`. As soon as these return, so does `cmd_commit_graph()`. `strbuf_getline()` may allocate memory in the strbuf, yet return EOF. We need to release the strbuf or UNLEAK it. Go for the latter since we are close to returning from `graph_write()`. `graph_write()` also fails to free the strings in the string list. They have been added to the list with `strdup_strings` set to 0. We could flip `strdup_strings` before clearing the list, which is our usual hack in situations like this. But since we are about to exit, let's just UNLEAK the whole string list instead. UNLEAK `graph` in `graph_verify`. While at it, and for consistency, UNLEAK in `graph_read()` as well, and remove an unnecessary UNLEAK just before dying. Signed-off-by: Martin Ågren <martin.agren@gmail.com> Signed-off-by: Derrick Stolee <dstolee@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-09-17commit-graph write: add progress outputLibravatar Ævar Arnfjörð Bjarmason1-2/+3
Before this change the "commit-graph write" command didn't report any progress. On my machine this command takes more than 10 seconds to write the graph for linux.git, and around 1m30s on the 2015-04-03-1M-git.git[1] test repository (a test case for a large monorepository). Furthermore, since the gc.writeCommitGraph setting was added in d5d5d7b641 ("gc: automatically write commit-graph files", 2018-06-27), there was no indication at all from a "git gc" run that anything was different. This why one of the progress bars being added here uses start_progress() instead of start_delayed_progress(), so that it's guaranteed to be seen. E.g. on my tiny 867 commit dotfiles.git repository: $ git -c gc.writeCommitGraph=true gc Enumerating objects: 2821, done. [...] Computing commit graph generation numbers: 100% (867/867), done. On larger repositories, such as linux.git the delayed progress bar(s) will kick in, and we'll show what's going on instead of, as was previously happening, printing nothing while we write the graph: $ git -c gc.writeCommitGraph=true gc [...] Annotating commits in commit graph: 1565573, done. Computing commit graph generation numbers: 100% (782484/782484), done. Note that here we don't show "Finding commits for commit graph", this is because under "git gc" we seed the search with the commit references in the repository, and that set is too small to show any progress, but would e.g. on a smaller repo such as git.git with --stdin-commits: $ git rev-list --all | git -c gc.writeCommitGraph=true write --stdin-commits Finding commits for commit graph: 100% (162576/162576), done. Computing commit graph generation numbers: 100% (162576/162576), done. With --stdin-packs we don't show any estimation of how much is left to do. This is because we might be processing more than one pack. We could be less lazy here and show progress, either by detecting that we're only processing one pack, or by first looping over the packs to discover how many commits they have. I don't see the point in doing that work. So instead we get (on 2015-04-03-1M-git.git): $ echo pack-<HASH>.idx | git -c gc.writeCommitGraph=true --exec-path=$PWD commit-graph write --stdin-packs Finding commits for commit graph: 13064614, done. Annotating commits in commit graph: 3001341, done. Computing commit graph generation numbers: 100% (1000447/1000447), done. No GC mode uses --stdin-packs. It's what they use at Microsoft to manually compute the generation numbers for their collection of large packs which are never coalesced. The reason we need a "report_progress" variable passed down from "git gc" is so that we don't report this output when we're running in the process "git gc --auto" detaches from the terminal. Since we write the commit graph from the "git gc" process itself (as opposed to what we do with say the "git repack" phase), we'd end up writing the output to .git/gc.log and reporting it to the user next time as part of the "The last gc run reported the following[...]" error, see 329e6e8794 ("gc: save log from daemonized gc --auto and print it next time", 2015-09-19). So we must keep track of whether or not we're running in that demonized mode, and if so print no progress. See [2] and subsequent replies for a discussion of an approach not taken in compute_generation_numbers(). I.e. we're saying "Computing commit graph generation numbers", even though on an established history we're mostly skipping over all the work we did in the past. This is similar to the white lie we tell in the "Writing objects" phase (not all are objects being written). Always showing progress is considered more important than accuracy. I.e. on a repository like 2015-04-03-1M-git.git we'd hang for 6 seconds with no output on the second "git gc" if no changes were made to any objects in the interim if we'd take the approach in [2]. 1. https://github.com/avar/2015-04-03-1M-git 2. <c6960252-c095-fb2b-e0bc-b1e6bb261614@gmail.com> (https://public-inbox.org/git/c6960252-c095-fb2b-e0bc-b1e6bb261614@gmail.com/) Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-08-21commit-graph: not compatible with replace objectsLibravatar Derrick Stolee1-0/+4
Create new method commit_graph_compatible(r) to check if a given repository r is compatible with the commit-graph feature. Fill the method with a check to see if replace-objects exist. Test this interaction succeeds, including ignoring an existing commit-graph and failing to write a new commit-graph. However, we do ensure that we write a new commit-graph by setting read_replace_refs to 0, thereby ignoring the replace refs. Signed-off-by: Derrick Stolee <dstolee@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-07-17commit-graph: add free_commit_graphLibravatar Jonathan Tan1-0/+2
Signed-off-by: Jonathan Tan <jonathantanmy@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-06-27commit-graph: add '--reachable' optionLibravatar Derrick Stolee1-4/+12
When writing commit-graph files, it can be convenient to ask for all reachable commits (starting at the ref set) in the resulting file. This is particularly helpful when writing to stdin is complicated, such as a future integration with 'git gc'. Signed-off-by: Derrick Stolee <dstolee@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-06-27commit-graph: use string-list API for inputLibravatar Derrick Stolee1-26/+13
Signed-off-by: Derrick Stolee <dstolee@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-06-27commit-graph: add 'verify' subcommandLibravatar Derrick Stolee1-0/+39
If the commit-graph file becomes corrupt, we need a way to verify that its contents match the object database. In the manner of 'git fsck' we will implement a 'git commit-graph verify' subcommand to report all issues with the file. Add the 'verify' subcommand to the 'commit-graph' builtin and its documentation. The subcommand is currently a no-op except for loading the commit-graph into memory, which may trigger run-time errors that would be caught by normal use. Add a simple test that ensures the command returns a zero error code. If no commit-graph file exists, this is an acceptable state. Do not report any errors. Helped-by: Ramsay Jones <ramsay@ramsayjones.plus.com> Signed-off-by: Derrick Stolee <dstolee@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-06-27commit-graph: UNLEAK before die()Libravatar Derrick Stolee1-1/+4
Signed-off-by: Derrick Stolee <dstolee@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-04-11commit-graph: implement "--append" optionLibravatar Derrick Stolee1-3/+7
Teach git-commit-graph to add all commits from the existing commit-graph file to the file about to be written. This should be used when adding new commits without performing garbage collection. Signed-off-by: Derrick Stolee <dstolee@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-04-11commit-graph: build graph from starting commitsLibravatar Derrick Stolee1-6/+21
Teach git-commit-graph to read commits from stdin when the --stdin-commits flag is specified. Commits reachable from these commits are added to the graph. This is a much faster way to construct the graph than inspecting all packed objects, but is restricted to known tips. For the Linux repository, 700,000+ commits were added to the graph file starting from 'master' in 7-9 seconds, depending on the number of packfiles in the repo (1, 24, or 120). Signed-off-by: Derrick Stolee <dstolee@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-04-11commit-graph: read only from specific pack-indexesLibravatar Derrick Stolee1-3/+30
Teach git-commit-graph to inspect the objects only in a certain list of pack-indexes within the given pack directory. This allows updating the commit graph iteratively. Signed-off-by: Derrick Stolee <dstolee@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-04-11commit-graph: implement git commit-graph readLibravatar Derrick Stolee1-0/+56
Teach git-commit-graph to read commit graph files and summarize their contents. Use the read subcommand to verify the contents of a commit graph file in the tests. Signed-off-by: Derrick Stolee <dstolee@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-04-02commit-graph: implement git-commit-graph writeLibravatar Derrick Stolee1-0/+33
Teach git-commit-graph to write graph files. Create new test script to verify this command succeeds without failure. Signed-off-by: Derrick Stolee <dstolee@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-04-02commit-graph: create git-commit-graph builtinLibravatar Derrick Stolee1-0/+36
Teach git the 'commit-graph' builtin that will be used for writing and reading packed graph files. The current implementation is mostly empty, except for an '--object-dir' option. Signed-off-by: Derrick Stolee <dstolee@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>