Mercurial > hg
view mercurial/help/subrepos.txt @ 29021:92d37fb3f1aa stable
verify: don't init subrepo when missing one is referenced (issue5128) (API)
Initializing a subrepo when one doesn't exist is the right thing to do when the
parent is being updated, but in few other cases. Unfortunately, there isn't
enough context in the subrepo module to distinguish this case. This same issue
can be caused with other subrepo aware commands, so there is a general issue
here beyond the scope of this fix.
A simpler attempt I tried was to add an '_updating' boolean to localrepo, and
set/clear it around the call to mergemod.update() in hg.updaterepo(). That
mostly worked, but doesn't handle the case where archive will clone the subrepo
if it is missing. (I vaguely recall that there may be other commands that will
clone if needed like this, but certainly not all do. It seems both handy, and a
bit surprising for what should be a read only operation. It might be nice if
all commands did this consistently, but we probably need Angel's subrepo caching
first, to not make a mess of the working directory.)
I originally handled 'Exception' in order to pick up the Aborts raised in
subrepo.state(), but this turns out to be unnecessary because that is called
once and cached by ctx.sub() when iterating the subrepos.
It was suggested in the bug discussion to skip looking at the subrepo links
unless -S is specified. I don't really like that idea because missing a subrepo
or (less likely, but worse) a corrupt .hgsubstate is a problem of the parent
repo when checking out a revision. The -S option seems like a better fit for
functionality that would recurse into each subrepo and do a full verification.
Ultimately, the default value for 'allowcreate' should probably be flipped, but
since the default behavior was to allow creation, this is less risky for now.
author | Matt Harbison <matt_harbison@yahoo.com> |
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date | Wed, 27 Apr 2016 22:45:52 -0400 |
parents | 63a57a2727b6 |
children | 2406dbba49bd |
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Subrepositories let you nest external repositories or projects into a parent Mercurial repository, and make commands operate on them as a group. Mercurial currently supports Mercurial, Git, and Subversion subrepositories. Subrepositories are made of three components: 1. Nested repository checkouts. They can appear anywhere in the parent working directory. 2. Nested repository references. They are defined in ``.hgsub``, which should be placed in the root of working directory, and tell where the subrepository checkouts come from. Mercurial subrepositories are referenced like:: path/to/nested = https://example.com/nested/repo/path Git and Subversion subrepos are also supported:: path/to/nested = [git]git://example.com/nested/repo/path path/to/nested = [svn]https://example.com/nested/trunk/path where ``path/to/nested`` is the checkout location relatively to the parent Mercurial root, and ``https://example.com/nested/repo/path`` is the source repository path. The source can also reference a filesystem path. Note that ``.hgsub`` does not exist by default in Mercurial repositories, you have to create and add it to the parent repository before using subrepositories. 3. Nested repository states. They are defined in ``.hgsubstate``, which is placed in the root of working directory, and capture whatever information is required to restore the subrepositories to the state they were committed in a parent repository changeset. Mercurial automatically record the nested repositories states when committing in the parent repository. .. note:: The ``.hgsubstate`` file should not be edited manually. Adding a Subrepository ====================== If ``.hgsub`` does not exist, create it and add it to the parent repository. Clone or checkout the external projects where you want it to live in the parent repository. Edit ``.hgsub`` and add the subrepository entry as described above. At this point, the subrepository is tracked and the next commit will record its state in ``.hgsubstate`` and bind it to the committed changeset. Synchronizing a Subrepository ============================= Subrepos do not automatically track the latest changeset of their sources. Instead, they are updated to the changeset that corresponds with the changeset checked out in the top-level changeset. This is so developers always get a consistent set of compatible code and libraries when they update. Thus, updating subrepos is a manual process. Simply check out target subrepo at the desired revision, test in the top-level repo, then commit in the parent repository to record the new combination. Deleting a Subrepository ======================== To remove a subrepository from the parent repository, delete its reference from ``.hgsub``, then remove its files. Interaction with Mercurial Commands =================================== :add: add does not recurse in subrepos unless -S/--subrepos is specified. However, if you specify the full path of a file in a subrepo, it will be added even without -S/--subrepos specified. Subversion subrepositories are currently silently ignored. :addremove: addremove does not recurse into subrepos unless -S/--subrepos is specified. However, if you specify the full path of a directory in a subrepo, addremove will be performed on it even without -S/--subrepos being specified. Git and Subversion subrepositories will print a warning and continue. :archive: archive does not recurse in subrepositories unless -S/--subrepos is specified. :cat: cat currently only handles exact file matches in subrepos. Subversion subrepositories are currently ignored. :commit: commit creates a consistent snapshot of the state of the entire project and its subrepositories. If any subrepositories have been modified, Mercurial will abort. Mercurial can be made to instead commit all modified subrepositories by specifying -S/--subrepos, or setting "ui.commitsubrepos=True" in a configuration file (see :hg:`help config`). After there are no longer any modified subrepositories, it records their state and finally commits it in the parent repository. The --addremove option also honors the -S/--subrepos option. However, Git and Subversion subrepositories will print a warning and abort. :diff: diff does not recurse in subrepos unless -S/--subrepos is specified. Changes are displayed as usual, on the subrepositories elements. Subversion subrepositories are currently silently ignored. :files: files does not recurse into subrepos unless -S/--subrepos is specified. However, if you specify the full path of a file or directory in a subrepo, it will be displayed even without -S/--subrepos being specified. Git and Subversion subrepositories are currently silently ignored. :forget: forget currently only handles exact file matches in subrepos. Git and Subversion subrepositories are currently silently ignored. :incoming: incoming does not recurse in subrepos unless -S/--subrepos is specified. Git and Subversion subrepositories are currently silently ignored. :outgoing: outgoing does not recurse in subrepos unless -S/--subrepos is specified. Git and Subversion subrepositories are currently silently ignored. :pull: pull is not recursive since it is not clear what to pull prior to running :hg:`update`. Listing and retrieving all subrepositories changes referenced by the parent repository pulled changesets is expensive at best, impossible in the Subversion case. :push: Mercurial will automatically push all subrepositories first when the parent repository is being pushed. This ensures new subrepository changes are available when referenced by top-level repositories. Push is a no-op for Subversion subrepositories. :status: status does not recurse into subrepositories unless -S/--subrepos is specified. Subrepository changes are displayed as regular Mercurial changes on the subrepository elements. Subversion subrepositories are currently silently ignored. :remove: remove does not recurse into subrepositories unless -S/--subrepos is specified. However, if you specify a file or directory path in a subrepo, it will be removed even without -S/--subrepos. Git and Subversion subrepositories are currently silently ignored. :update: update restores the subrepos in the state they were originally committed in target changeset. If the recorded changeset is not available in the current subrepository, Mercurial will pull it in first before updating. This means that updating can require network access when using subrepositories. Remapping Subrepositories Sources ================================= A subrepository source location may change during a project life, invalidating references stored in the parent repository history. To fix this, rewriting rules can be defined in parent repository ``hgrc`` file or in Mercurial configuration. See the ``[subpaths]`` section in hgrc(5) for more details.