Mercurial > hg
annotate mercurial/help/subrepos.txt @ 21811:789b69d597cc
dirstate.status: assign members one by one instead of unpacking the tuple
With this patch, hg status and hg diff regain their previous speed.
The following tests are run against a working copy with over 270,000 files.
Here, 'before' means without this or the previous patch applied.
Note that in this case `hg perfstatus` isn't representative since it doesn't
take dirstate parsing time into account.
$ time hg status # best of 5
before: 2.03s user 1.25s system 99% cpu 3.290 total
after: 2.01s user 1.25s system 99% cpu 3.261 total
$ time hg diff # best of 5
before: 1.32s user 0.78s system 99% cpu 2.105 total
after: 1.27s user 0.79s system 99% cpu 2.066 total
author | Siddharth Agarwal <sid0@fb.com> |
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date | Tue, 27 May 2014 21:02:16 -0700 |
parents | a2cc3c08c3ac |
children | 4165cfd67519 |
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12828 | 1 Subrepositories let you nest external repositories or projects into a |
2 parent Mercurial repository, and make commands operate on them as a | |
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3 group. |
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4 |
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5 Mercurial currently supports Mercurial, Git, and Subversion |
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6 subrepositories. |
12828 | 7 |
8 Subrepositories are made of three components: | |
9 | |
10 1. Nested repository checkouts. They can appear anywhere in the | |
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11 parent working directory. |
12828 | 12 |
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13 2. Nested repository references. They are defined in ``.hgsub``, which |
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14 should be placed in the root of working directory, and |
12828 | 15 tell where the subrepository checkouts come from. Mercurial |
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16 subrepositories are referenced like:: |
12828 | 17 |
18 path/to/nested = https://example.com/nested/repo/path | |
19 | |
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20 Git and Subversion subrepos are also supported:: |
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21 |
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22 path/to/nested = [git]git://example.com/nested/repo/path |
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23 path/to/nested = [svn]https://example.com/nested/trunk/path |
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24 |
12828 | 25 where ``path/to/nested`` is the checkout location relatively to the |
26 parent Mercurial root, and ``https://example.com/nested/repo/path`` | |
27 is the source repository path. The source can also reference a | |
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28 filesystem path. |
12828 | 29 |
30 Note that ``.hgsub`` does not exist by default in Mercurial | |
31 repositories, you have to create and add it to the parent | |
32 repository before using subrepositories. | |
33 | |
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34 3. Nested repository states. They are defined in ``.hgsubstate``, which |
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35 is placed in the root of working directory, and |
12828 | 36 capture whatever information is required to restore the |
37 subrepositories to the state they were committed in a parent | |
38 repository changeset. Mercurial automatically record the nested | |
39 repositories states when committing in the parent repository. | |
40 | |
41 .. note:: | |
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42 |
12828 | 43 The ``.hgsubstate`` file should not be edited manually. |
44 | |
45 | |
46 Adding a Subrepository | |
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47 ====================== |
12828 | 48 |
49 If ``.hgsub`` does not exist, create it and add it to the parent | |
50 repository. Clone or checkout the external projects where you want it | |
51 to live in the parent repository. Edit ``.hgsub`` and add the | |
52 subrepository entry as described above. At this point, the | |
53 subrepository is tracked and the next commit will record its state in | |
54 ``.hgsubstate`` and bind it to the committed changeset. | |
55 | |
56 Synchronizing a Subrepository | |
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57 ============================= |
12828 | 58 |
59 Subrepos do not automatically track the latest changeset of their | |
60 sources. Instead, they are updated to the changeset that corresponds | |
61 with the changeset checked out in the top-level changeset. This is so | |
62 developers always get a consistent set of compatible code and | |
63 libraries when they update. | |
64 | |
65 Thus, updating subrepos is a manual process. Simply check out target | |
66 subrepo at the desired revision, test in the top-level repo, then | |
67 commit in the parent repository to record the new combination. | |
68 | |
69 Deleting a Subrepository | |
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70 ======================== |
12828 | 71 |
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72 To remove a subrepository from the parent repository, delete its |
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73 reference from ``.hgsub``, then remove its files. |
12828 | 74 |
75 Interaction with Mercurial Commands | |
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76 =================================== |
12828 | 77 |
78 :add: add does not recurse in subrepos unless -S/--subrepos is | |
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79 specified. However, if you specify the full path of a file in a |
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80 subrepo, it will be added even without -S/--subrepos specified. |
15432 | 81 Git and Subversion subrepositories are currently silently |
12828 | 82 ignored. |
83 | |
84 :archive: archive does not recurse in subrepositories unless | |
85 -S/--subrepos is specified. | |
86 | |
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87 :cat: cat currently only handles exact file matches in subrepos. |
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88 Git and Subversion subrepositories are currently ignored. |
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89 |
12828 | 90 :commit: commit creates a consistent snapshot of the state of the |
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91 entire project and its subrepositories. If any subrepositories |
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92 have been modified, Mercurial will abort. Mercurial can be made |
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93 to instead commit all modified subrepositories by specifying |
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94 -S/--subrepos, or setting "ui.commitsubrepos=True" in a |
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95 configuration file (see :hg:`help config`). After there are no |
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96 longer any modified subrepositories, it records their state and |
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97 finally commits it in the parent repository. |
12828 | 98 |
99 :diff: diff does not recurse in subrepos unless -S/--subrepos is | |
100 specified. Changes are displayed as usual, on the subrepositories | |
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101 elements. Git and Subversion subrepositories are currently |
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102 silently ignored. |
12828 | 103 |
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104 :forget: forget currently only handles exact file matches in subrepos. |
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105 Git and Subversion subrepositories are currently silently ignored. |
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106 |
12828 | 107 :incoming: incoming does not recurse in subrepos unless -S/--subrepos |
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108 is specified. Git and Subversion subrepositories are currently |
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109 silently ignored. |
12828 | 110 |
111 :outgoing: outgoing does not recurse in subrepos unless -S/--subrepos | |
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112 is specified. Git and Subversion subrepositories are currently |
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113 silently ignored. |
12828 | 114 |
115 :pull: pull is not recursive since it is not clear what to pull prior | |
116 to running :hg:`update`. Listing and retrieving all | |
117 subrepositories changes referenced by the parent repository pulled | |
118 changesets is expensive at best, impossible in the Subversion | |
119 case. | |
120 | |
121 :push: Mercurial will automatically push all subrepositories first | |
122 when the parent repository is being pushed. This ensures new | |
123 subrepository changes are available when referenced by top-level | |
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124 repositories. Push is a no-op for Subversion subrepositories. |
12828 | 125 |
126 :status: status does not recurse into subrepositories unless | |
127 -S/--subrepos is specified. Subrepository changes are displayed as | |
128 regular Mercurial changes on the subrepository | |
129 elements. Subversion subrepositories are currently silently | |
130 ignored. | |
131 | |
132 :update: update restores the subrepos in the state they were | |
133 originally committed in target changeset. If the recorded | |
134 changeset is not available in the current subrepository, Mercurial | |
135 will pull it in first before updating. This means that updating | |
136 can require network access when using subrepositories. | |
137 | |
138 Remapping Subrepositories Sources | |
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139 ================================= |
12828 | 140 |
141 A subrepository source location may change during a project life, | |
142 invalidating references stored in the parent repository history. To | |
143 fix this, rewriting rules can be defined in parent repository ``hgrc`` | |
144 file or in Mercurial configuration. See the ``[subpaths]`` section in | |
145 hgrc(5) for more details. | |
146 |