Mercurial > hg
annotate mercurial/help/subrepos.txt @ 23324:69f86b937035
cmdserver: protect pipe server streams against corruption caused by direct io
Because pipe-mode server uses stdio as IPC channel, other modules should not
touch stdio directly and use ui instead. However, this strategy is brittle
because several Python functions read and write stdio implicitly.
print 'hello' # should use ui.write()
# => ch = 'h', size = 1701604463 'ello', data = '\n'
This patch adds protection for such mistakes. Both stdio files and low-level
file descriptors are redirected to /dev/null while command server uses them.
author | Yuya Nishihara <yuya@tcha.org> |
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date | Sat, 15 Nov 2014 13:50:43 +0900 |
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 |