mirror of
https://we.phorge.it/source/phorge.git
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No description
e0b86cc81b
Summary: Repository import has three major steps: - Commit discovery (serial) - Message parsing (parallel, mostly VCS independent) - Change parsing (parallel, highly VCS dependent) This implements commit discovery for Mercurial, similar to git's parsing: - List the heads of all the branches. - If we haven't already discovered them, follow them back to their roots (or the first commit we have discovered). - Import all the newly discovered commits, oldest first. This is a little complicated but it ensures we discover commits in depth order, so the discovery process is robust against interruption/failure. If we just inserted commits as we went, we might read the tip, insert it, and then crash. When we ran again, we'd think we had already discovered commits older than HEAD. This also allows later stages to rely on being able to find Phabricator commit IDs which correspond to parent commits. NOTE: This importer is fairly slow because "hg" has a large startup time (compare "hg --version" to "git --version" and "svn --version"; on my machine, hg has 60ms of overhead for any command) and we need to run many commands (see the whole "hg id" mess). You can expect something like 10,000 per hour, which means you may need to run overnight to discover a large repository (IIRC, the svn/git discovery processes are both about an order of magnitude faster). We could improve this with batching, but I want to keep it as simple as possible for now. Test Plan: Discovered all the commits in the main Mercurial repository, http://selenic.com/repo/hg. Reviewers: Makinde, jungejason, nh, tuomaspelkonen, aran Reviewed By: Makinde CC: aran, Makinde Differential Revision: 943 |
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Phabricator is a open source collection of web applications which make it easier to write, review, and share source code. Phabricator was developed at Facebook. This is an early release. It's pretty high-quality and usable, but under active development so things may change quickly. You can learn more about the project and find links to documentation and resources at: http://phabricator.org/ LICENSE Phabricator is released under the Apache 2.0 license except as otherwise noted. http://www.apache.org/licenses/LICENSE-2.0