##// END OF EJS Templates
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1 1 # Copyright 2009-2010 Gregory P. Ward
2 2 # Copyright 2009-2010 Intelerad Medical Systems Incorporated
3 3 # Copyright 2010-2011 Fog Creek Software
4 4 # Copyright 2010-2011 Unity Technologies
5 5 #
6 6 # This software may be used and distributed according to the terms of the
7 7 # GNU General Public License version 2 or any later version.
8 8
9 9 '''track large binary files
10 10
11 11 Large binary files tend to be not very compressible, not very
12 12 diffable, and not at all mergeable. Such files are not handled
13 13 efficiently by Mercurial's storage format (revlog), which is based on
14 14 compressed binary deltas; storing large binary files as regular
15 15 Mercurial files wastes bandwidth and disk space and increases
16 16 Mercurial's memory usage. The largefiles extension addresses these
17 17 problems by adding a centralized client-server layer on top of
18 18 Mercurial: largefiles live in a *central store* out on the network
19 19 somewhere, and you only fetch the revisions that you need when you
20 20 need them.
21 21
22 22 largefiles works by maintaining a "standin file" in .hglf/ for each
23 23 largefile. The standins are small (41 bytes: an SHA-1 hash plus
24 24 newline) and are tracked by Mercurial. Largefile revisions are
25 25 identified by the SHA-1 hash of their contents, which is written to
26 26 the standin. largefiles uses that revision ID to get/put largefile
27 27 revisions from/to the central store. This saves both disk space and
28 28 bandwidth, since you don't need to retrieve all historical revisions
29 29 of large files when you clone or pull.
30 30
31 31 To start a new repository or add new large binary files, just add
32 32 --large to your :hg:`add` command. For example::
33 33
34 34 $ dd if=/dev/urandom of=randomdata count=2000
35 35 $ hg add --large randomdata
36 $ hg commit -m 'add randomdata as a largefile'
36 $ hg commit -m "add randomdata as a largefile"
37 37
38 38 When you push a changeset that adds/modifies largefiles to a remote
39 39 repository, its largefile revisions will be uploaded along with it.
40 40 Note that the remote Mercurial must also have the largefiles extension
41 41 enabled for this to work.
42 42
43 43 When you pull a changeset that affects largefiles from a remote
44 44 repository, the largefiles for the changeset will by default not be
45 45 pulled down. However, when you update to such a revision, any
46 46 largefiles needed by that revision are downloaded and cached (if
47 47 they have never been downloaded before). One way to pull largefiles
48 48 when pulling is thus to use --update, which will update your working
49 49 copy to the latest pulled revision (and thereby downloading any new
50 50 largefiles).
51 51
52 52 If you want to pull largefiles you don't need for update yet, then
53 53 you can use pull with the `--lfrev` option or the :hg:`lfpull` command.
54 54
55 55 If you know you are pulling from a non-default location and want to
56 56 download all the largefiles that correspond to the new changesets at
57 57 the same time, then you can pull with `--lfrev "pulled()"`.
58 58
59 59 If you just want to ensure that you will have the largefiles needed to
60 60 merge or rebase with new heads that you are pulling, then you can pull
61 61 with `--lfrev "head(pulled())"` flag to pre-emptively download any largefiles
62 62 that are new in the heads you are pulling.
63 63
64 64 Keep in mind that network access may now be required to update to
65 65 changesets that you have not previously updated to. The nature of the
66 66 largefiles extension means that updating is no longer guaranteed to
67 67 be a local-only operation.
68 68
69 69 If you already have large files tracked by Mercurial without the
70 70 largefiles extension, you will need to convert your repository in
71 71 order to benefit from largefiles. This is done with the
72 72 :hg:`lfconvert` command::
73 73
74 74 $ hg lfconvert --size 10 oldrepo newrepo
75 75
76 76 In repositories that already have largefiles in them, any new file
77 77 over 10MB will automatically be added as a largefile. To change this
78 78 threshold, set ``largefiles.minsize`` in your Mercurial config file
79 79 to the minimum size in megabytes to track as a largefile, or use the
80 80 --lfsize option to the add command (also in megabytes)::
81 81
82 82 [largefiles]
83 83 minsize = 2
84 84
85 85 $ hg add --lfsize 2
86 86
87 87 The ``largefiles.patterns`` config option allows you to specify a list
88 88 of filename patterns (see :hg:`help patterns`) that should always be
89 89 tracked as largefiles::
90 90
91 91 [largefiles]
92 92 patterns =
93 93 *.jpg
94 94 re:.*\.(png|bmp)$
95 95 library.zip
96 96 content/audio/*
97 97
98 98 Files that match one of these patterns will be added as largefiles
99 99 regardless of their size.
100 100
101 101 The ``largefiles.minsize`` and ``largefiles.patterns`` config options
102 102 will be ignored for any repositories not already containing a
103 103 largefile. To add the first largefile to a repository, you must
104 104 explicitly do so with the --large flag passed to the :hg:`add`
105 105 command.
106 106 '''
107 107
108 108 from mercurial import hg, localrepo
109 109
110 110 import lfcommands
111 111 import proto
112 112 import reposetup
113 113 import uisetup as uisetupmod
114 114 import overrides
115 115
116 116 # Note for extension authors: ONLY specify testedwith = 'internal' for
117 117 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
118 118 # be specifying the version(s) of Mercurial they are tested with, or
119 119 # leave the attribute unspecified.
120 120 testedwith = 'internal'
121 121
122 122 reposetup = reposetup.reposetup
123 123
124 124 def featuresetup(ui, supported):
125 125 # don't die on seeing a repo with the largefiles requirement
126 126 supported |= set(['largefiles'])
127 127
128 128 def uisetup(ui):
129 129 localrepo.localrepository.featuresetupfuncs.add(featuresetup)
130 130 hg.wirepeersetupfuncs.append(proto.wirereposetup)
131 131 uisetupmod.uisetup(ui)
132 132
133 133 cmdtable = lfcommands.cmdtable
134 134 revsetpredicate = overrides.revsetpredicate
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