| commit | 8a6ac287b2ba5f75bb2d9409dd97e9b501daf253 | [log] [tgz] |
|---|---|---|
| author | Taylor Blau <me@ttaylorr.com> | Mon Apr 13 22:04:17 2020 -0600 |
| committer | Junio C Hamano <gitster@pobox.com> | Wed Apr 15 09:20:28 2020 -0700 |
| tree | ed0fc9f67c9d9369cd12530cf885da21128d797d | |
| parent | fdbde82fe523374b3c5d1f0f01f3c43dcaca9465 [diff] |
builtin/commit-graph.c: introduce split strategy 'replace' When using split commit-graphs, it is sometimes useful to completely replace the commit-graph chain with a new base. For example, consider a scenario in which a repository builds a new commit-graph incremental for each push. Occasionally (say, after some fixed number of pushes), they may wish to rebuild the commit-graph chain with all reachable commits. They can do so with $ git commit-graph write --reachable but this removes the chain entirely and replaces it with a single commit-graph in 'objects/info/commit-graph'. Unfortunately, this means that the next push will have to move this commit-graph into the first layer of a new chain, and then write its new commits on top. Avoid such copying entirely by allowing the caller to specify that they wish to replace the entirety of their commit-graph chain, while also specifying that the new commit-graph should become the basis of a fresh, length-one chain. This addresses the above situation by making it possible for the caller to instead write: $ git commit-graph write --reachable --split=replace which writes a new length-one chain to 'objects/info/commit-graphs', making the commit-graph incremental generated by the subsequent push relatively cheap by avoiding the aforementioned copy. In order to do this, remove an assumption in 'write_commit_graph_file' that chains are always at least two incrementals long. Signed-off-by: Taylor Blau <me@ttaylorr.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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