Mercurial > hg
annotate hgext/lfs/__init__.py @ 37147:a2566597acb5
lfs: add basic routing for the server side wire protocol processing
The recent hgweb refactoring yielded a clean point to wrap a function that could
handle this, so I moved the routing for this out of the core. While not an hg
wire protocol, this seems logically close enough. For now, these handlers do
nothing other than check permissions.
The protocol requires support for PUT requests, so that has been added to the
core, and funnels into the same handler as GET and POST. The permission
checking code was assuming that anything not checking 'pull' or None ops should
be using POST. But that breaks the upload check if it checks 'push'. So I
invented a new 'upload' permission, and used it to avoid the mandate to POST. A
function wrap point could be added, but security code should probably stay
grouped together. Given that anything not 'pull' or None was requiring POST,
the comment on hgweb.common.permhooks is probably wrong- there is no 'read'.
The rationale for the URIs is that the spec for the Batch API[1] defines the URL
as the LFS server url + '/objects/batch'. The default git URLs are:
Git remote: https://git-server.com/foo/bar
LFS server: https://git-server.com/foo/bar.git/info/lfs
Batch API: https://git-server.com/foo/bar.git/info/lfs/objects/batch
'.git/' seems like it's not something a user would normally track. If we adhere
to how git defines the URLs, then the hg-git extension should be able to talk to
a git based server without any additional work.
The URI for the transfer requests starts with '.hg/' to ensure that there are no
conflicts with tracked files. Since these are handed out by the Batch API, we
can change this at any point in the future. (Specifically, it might be a good
idea to use something under the proposed /api/ namespace.) In any case, no
files are stored at these locations in the repository directory.
I started a new module for this because it seems like a good idea to keep all of
the security sensitive server side code together. There's also an issue with
`hg verify` in that it will want to download *all* blobs in order to run.
Sadly, there's no way in the protocol to ask the server to verify the content of
a blob it may have. (The verify action is for storing files on a 3rd party
server, and then informing the LFS server when that completes.) So we may end
up implementing a custom transfer adapter that simply indicates if the blobs are
valid, and fall back to basic transfers for non-hg servers. In other words,
this code is likely to get bigger before this is made non-experimental.
[1] https://github.com/git-lfs/git-lfs/blob/master/docs/api/batch.md
author | Matt Harbison <matt_harbison@yahoo.com> |
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date | Sat, 17 Mar 2018 01:23:01 -0400 |
parents | 4d63f3bc1e1a |
children | 6c7a6b04b274 |
rev | line source |
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1 # lfs - hash-preserving large file support using Git-LFS protocol |
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2 # |
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3 # Copyright 2017 Facebook, Inc. |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
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6 # GNU General Public License version 2 or any later version. |
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7 |
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8 """lfs - large file support (EXPERIMENTAL) |
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9 |
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10 This extension allows large files to be tracked outside of the normal |
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11 repository storage and stored on a centralized server, similar to the |
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12 ``largefiles`` extension. The ``git-lfs`` protocol is used when |
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13 communicating with the server, so existing git infrastructure can be |
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14 harnessed. Even though the files are stored outside of the repository, |
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15 they are still integrity checked in the same manner as normal files. |
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16 |
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17 The files stored outside of the repository are downloaded on demand, |
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18 which reduces the time to clone, and possibly the local disk usage. |
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19 This changes fundamental workflows in a DVCS, so careful thought |
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20 should be given before deploying it. :hg:`convert` can be used to |
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21 convert LFS repositories to normal repositories that no longer |
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22 require this extension, and do so without changing the commit hashes. |
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23 This allows the extension to be disabled if the centralized workflow |
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24 becomes burdensome. However, the pre and post convert clones will |
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25 not be able to communicate with each other unless the extension is |
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26 enabled on both. |
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27 |
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28 To start a new repository, or to add LFS files to an existing one, just |
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29 create an ``.hglfs`` file as described below in the root directory of |
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30 the repository. Typically, this file should be put under version |
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31 control, so that the settings will propagate to other repositories with |
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32 push and pull. During any commit, Mercurial will consult this file to |
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33 determine if an added or modified file should be stored externally. The |
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34 type of storage depends on the characteristics of the file at each |
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35 commit. A file that is near a size threshold may switch back and forth |
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36 between LFS and normal storage, as needed. |
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37 |
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38 Alternately, both normal repositories and largefile controlled |
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39 repositories can be converted to LFS by using :hg:`convert` and the |
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40 ``lfs.track`` config option described below. The ``.hglfs`` file |
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41 should then be created and added, to control subsequent LFS selection. |
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42 The hashes are also unchanged in this case. The LFS and non-LFS |
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43 repositories can be distinguished because the LFS repository will |
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44 abort any command if this extension is disabled. |
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45 |
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46 Committed LFS files are held locally, until the repository is pushed. |
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47 Prior to pushing the normal repository data, the LFS files that are |
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48 tracked by the outgoing commits are automatically uploaded to the |
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49 configured central server. No LFS files are transferred on |
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50 :hg:`pull` or :hg:`clone`. Instead, the files are downloaded on |
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51 demand as they need to be read, if a cached copy cannot be found |
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52 locally. Both committing and downloading an LFS file will link the |
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53 file to a usercache, to speed up future access. See the `usercache` |
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54 config setting described below. |
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55 |
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56 .hglfs:: |
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57 |
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58 The extension reads its configuration from a versioned ``.hglfs`` |
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59 configuration file found in the root of the working directory. The |
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60 ``.hglfs`` file uses the same syntax as all other Mercurial |
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61 configuration files. It uses a single section, ``[track]``. |
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62 |
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63 The ``[track]`` section specifies which files are stored as LFS (or |
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64 not). Each line is keyed by a file pattern, with a predicate value. |
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65 The first file pattern match is used, so put more specific patterns |
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66 first. The available predicates are ``all()``, ``none()``, and |
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67 ``size()``. See "hg help filesets.size" for the latter. |
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68 |
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69 Example versioned ``.hglfs`` file:: |
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70 |
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71 [track] |
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72 # No Makefile or python file, anywhere, will be LFS |
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73 **Makefile = none() |
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74 **.py = none() |
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75 |
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76 **.zip = all() |
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77 **.exe = size(">1MB") |
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78 |
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79 # Catchall for everything not matched above |
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80 ** = size(">10MB") |
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81 |
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82 Configs:: |
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83 |
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84 [lfs] |
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85 # Remote endpoint. Multiple protocols are supported: |
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86 # - http(s)://user:pass@example.com/path |
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87 # git-lfs endpoint |
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88 # - file:///tmp/path |
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89 # local filesystem, usually for testing |
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90 # if unset, lfs will prompt setting this when it must use this value. |
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91 # (default: unset) |
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92 url = https://example.com/repo.git/info/lfs |
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93 |
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94 # Which files to track in LFS. Path tests are "**.extname" for file |
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95 # extensions, and "path:under/some/directory" for path prefix. Both |
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96 # are relative to the repository root. |
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97 # File size can be tested with the "size()" fileset, and tests can be |
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98 # joined with fileset operators. (See "hg help filesets.operators".) |
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99 # |
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100 # Some examples: |
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101 # - all() # everything |
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102 # - none() # nothing |
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103 # - size(">20MB") # larger than 20MB |
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104 # - !**.txt # anything not a *.txt file |
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105 # - **.zip | **.tar.gz | **.7z # some types of compressed files |
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106 # - path:bin # files under "bin" in the project root |
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107 # - (**.php & size(">2MB")) | (**.js & size(">5MB")) | **.tar.gz |
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108 # | (path:bin & !path:/bin/README) | size(">1GB") |
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109 # (default: none()) |
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110 # |
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111 # This is ignored if there is a tracked '.hglfs' file, and this setting |
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112 # will eventually be deprecated and removed. |
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113 track = size(">10M") |
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114 |
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115 # how many times to retry before giving up on transferring an object |
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116 retry = 5 |
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117 |
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118 # the local directory to store lfs files for sharing across local clones. |
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119 # If not set, the cache is located in an OS specific cache location. |
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120 usercache = /path/to/global/cache |
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121 """ |
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122 |
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123 from __future__ import absolute_import |
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124 |
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125 from mercurial.i18n import _ |
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126 |
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127 from mercurial import ( |
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128 bundle2, |
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129 changegroup, |
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130 cmdutil, |
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131 config, |
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132 context, |
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133 error, |
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134 exchange, |
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135 extensions, |
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136 filelog, |
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137 fileset, |
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138 hg, |
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139 localrepo, |
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140 minifileset, |
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141 node, |
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142 pycompat, |
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143 registrar, |
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144 revlog, |
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145 scmutil, |
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146 templateutil, |
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147 upgrade, |
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148 util, |
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149 vfs as vfsmod, |
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150 wireproto, |
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151 wireprotoserver, |
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152 ) |
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153 |
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154 from . import ( |
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155 blobstore, |
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156 wireprotolfsserver, |
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157 wrapper, |
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158 ) |
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159 |
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160 # Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for |
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161 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should |
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162 # be specifying the version(s) of Mercurial they are tested with, or |
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163 # leave the attribute unspecified. |
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164 testedwith = 'ships-with-hg-core' |
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165 |
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166 configtable = {} |
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167 configitem = registrar.configitem(configtable) |
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168 |
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169 configitem('experimental', 'lfs.user-agent', |
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170 default=None, |
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171 ) |
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172 configitem('experimental', 'lfs.worker-enable', |
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173 default=False, |
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174 ) |
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175 |
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176 configitem('lfs', 'url', |
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177 default=None, |
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178 ) |
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179 configitem('lfs', 'usercache', |
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180 default=None, |
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181 ) |
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182 # Deprecated |
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183 configitem('lfs', 'threshold', |
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184 default=None, |
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185 ) |
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186 configitem('lfs', 'track', |
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187 default='none()', |
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188 ) |
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189 configitem('lfs', 'retry', |
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190 default=5, |
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191 ) |
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192 |
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193 cmdtable = {} |
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194 command = registrar.command(cmdtable) |
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195 |
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196 templatekeyword = registrar.templatekeyword() |
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197 filesetpredicate = registrar.filesetpredicate() |
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198 |
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199 def featuresetup(ui, supported): |
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200 # don't die on seeing a repo with the lfs requirement |
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201 supported |= {'lfs'} |
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202 |
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203 def uisetup(ui): |
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204 localrepo.featuresetupfuncs.add(featuresetup) |
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205 |
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206 def reposetup(ui, repo): |
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207 # Nothing to do with a remote repo |
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208 if not repo.local(): |
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209 return |
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210 |
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211 repo.svfs.lfslocalblobstore = blobstore.local(repo) |
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212 repo.svfs.lfsremoteblobstore = blobstore.remote(repo) |
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213 |
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214 class lfsrepo(repo.__class__): |
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215 @localrepo.unfilteredmethod |
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216 def commitctx(self, ctx, error=False): |
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217 repo.svfs.options['lfstrack'] = _trackedmatcher(self) |
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218 return super(lfsrepo, self).commitctx(ctx, error) |
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219 |
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220 repo.__class__ = lfsrepo |
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221 |
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222 if 'lfs' not in repo.requirements: |
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223 def checkrequireslfs(ui, repo, **kwargs): |
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224 if 'lfs' not in repo.requirements: |
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225 last = kwargs.get(r'node_last') |
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226 _bin = node.bin |
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227 if last: |
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228 s = repo.set('%n:%n', _bin(kwargs[r'node']), _bin(last)) |
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229 else: |
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230 s = repo.set('%n', _bin(kwargs[r'node'])) |
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231 match = repo.narrowmatch() |
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232 for ctx in s: |
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233 # TODO: is there a way to just walk the files in the commit? |
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234 if any(ctx[f].islfs() for f in ctx.files() |
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235 if f in ctx and match(f)): |
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236 repo.requirements.add('lfs') |
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237 repo._writerequirements() |
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238 repo.prepushoutgoinghooks.add('lfs', wrapper.prepush) |
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239 break |
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240 |
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241 ui.setconfig('hooks', 'commit.lfs', checkrequireslfs, 'lfs') |
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242 ui.setconfig('hooks', 'pretxnchangegroup.lfs', checkrequireslfs, 'lfs') |
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243 else: |
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244 repo.prepushoutgoinghooks.add('lfs', wrapper.prepush) |
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245 |
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246 def _trackedmatcher(repo): |
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247 """Return a function (path, size) -> bool indicating whether or not to |
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248 track a given file with lfs.""" |
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249 if not repo.wvfs.exists('.hglfs'): |
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250 # No '.hglfs' in wdir. Fallback to config for now. |
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251 trackspec = repo.ui.config('lfs', 'track') |
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252 |
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253 # deprecated config: lfs.threshold |
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254 threshold = repo.ui.configbytes('lfs', 'threshold') |
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255 if threshold: |
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256 fileset.parse(trackspec) # make sure syntax errors are confined |
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257 trackspec = "(%s) | size('>%d')" % (trackspec, threshold) |
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258 |
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259 return minifileset.compile(trackspec) |
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260 |
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261 data = repo.wvfs.tryread('.hglfs') |
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262 if not data: |
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263 return lambda p, s: False |
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264 |
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265 # Parse errors here will abort with a message that points to the .hglfs file |
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266 # and line number. |
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267 cfg = config.config() |
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268 cfg.parse('.hglfs', data) |
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269 |
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270 try: |
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271 rules = [(minifileset.compile(pattern), minifileset.compile(rule)) |
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272 for pattern, rule in cfg.items('track')] |
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273 except error.ParseError as e: |
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274 # The original exception gives no indicator that the error is in the |
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275 # .hglfs file, so add that. |
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276 |
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277 # TODO: See if the line number of the file can be made available. |
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278 raise error.Abort(_('parse error in .hglfs: %s') % e) |
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279 |
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280 def _match(path, size): |
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281 for pat, rule in rules: |
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282 if pat(path, size): |
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283 return rule(path, size) |
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284 |
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285 return False |
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286 |
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287 return _match |
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288 |
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289 def wrapfilelog(filelog): |
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290 wrapfunction = extensions.wrapfunction |
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291 |
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292 wrapfunction(filelog, 'addrevision', wrapper.filelogaddrevision) |
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293 wrapfunction(filelog, 'renamed', wrapper.filelogrenamed) |
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294 wrapfunction(filelog, 'size', wrapper.filelogsize) |
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295 |
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296 def extsetup(ui): |
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297 wrapfilelog(filelog.filelog) |
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298 |
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299 wrapfunction = extensions.wrapfunction |
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300 |
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301 wrapfunction(cmdutil, '_updatecatformatter', wrapper._updatecatformatter) |
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302 wrapfunction(scmutil, 'wrapconvertsink', wrapper.convertsink) |
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303 |
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304 wrapfunction(upgrade, '_finishdatamigration', |
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305 wrapper.upgradefinishdatamigration) |
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306 |
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307 wrapfunction(upgrade, 'preservedrequirements', |
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308 wrapper.upgraderequirements) |
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309 |
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310 wrapfunction(upgrade, 'supporteddestrequirements', |
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311 wrapper.upgraderequirements) |
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312 |
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313 wrapfunction(changegroup, |
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314 'allsupportedversions', |
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315 wrapper.allsupportedversions) |
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316 |
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317 wrapfunction(exchange, 'push', wrapper.push) |
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318 wrapfunction(wireproto, '_capabilities', wrapper._capabilities) |
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319 wrapfunction(wireprotoserver, 'handlewsgirequest', |
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320 wireprotolfsserver.handlewsgirequest) |
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321 |
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322 wrapfunction(context.basefilectx, 'cmp', wrapper.filectxcmp) |
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323 wrapfunction(context.basefilectx, 'isbinary', wrapper.filectxisbinary) |
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324 context.basefilectx.islfs = wrapper.filectxislfs |
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325 |
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326 revlog.addflagprocessor( |
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327 revlog.REVIDX_EXTSTORED, |
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328 ( |
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329 wrapper.readfromstore, |
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330 wrapper.writetostore, |
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331 wrapper.bypasscheckhash, |
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332 ), |
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333 ) |
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334 |
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335 wrapfunction(hg, 'clone', wrapper.hgclone) |
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336 wrapfunction(hg, 'postshare', wrapper.hgpostshare) |
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337 |
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338 scmutil.fileprefetchhooks.add('lfs', wrapper._prefetchfiles) |
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339 |
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340 # Make bundle choose changegroup3 instead of changegroup2. This affects |
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341 # "hg bundle" command. Note: it does not cover all bundle formats like |
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342 # "packed1". Using "packed1" with lfs will likely cause trouble. |
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343 names = [k for k, v in exchange._bundlespeccgversions.items() if v == '02'] |
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344 for k in names: |
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345 exchange._bundlespeccgversions[k] = '03' |
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346 |
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347 # bundlerepo uses "vfsmod.readonlyvfs(othervfs)", we need to make sure lfs |
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348 # options and blob stores are passed from othervfs to the new readonlyvfs. |
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349 wrapfunction(vfsmod.readonlyvfs, '__init__', wrapper.vfsinit) |
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350 |
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351 # when writing a bundle via "hg bundle" command, upload related LFS blobs |
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352 wrapfunction(bundle2, 'writenewbundle', wrapper.writenewbundle) |
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353 |
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354 @filesetpredicate('lfs()', callstatus=True) |
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355 def lfsfileset(mctx, x): |
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356 """File that uses LFS storage.""" |
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357 # i18n: "lfs" is a keyword |
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358 fileset.getargs(x, 0, 0, _("lfs takes no arguments")) |
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359 return [f for f in mctx.subset |
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360 if wrapper.pointerfromctx(mctx.ctx, f, removed=True) is not None] |
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361 |
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362 @templatekeyword('lfs_files', requires={'ctx'}) |
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363 def lfsfiles(context, mapping): |
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364 """List of strings. All files modified, added, or removed by this |
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365 changeset.""" |
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366 ctx = context.resource(mapping, 'ctx') |
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367 |
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368 pointers = wrapper.pointersfromctx(ctx, removed=True) # {path: pointer} |
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369 files = sorted(pointers.keys()) |
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370 |
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371 def pointer(v): |
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372 # In the file spec, version is first and the other keys are sorted. |
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373 sortkeyfunc = lambda x: (x[0] != 'version', x) |
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374 items = sorted(pointers[v].iteritems(), key=sortkeyfunc) |
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375 return util.sortdict(items) |
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376 |
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377 makemap = lambda v: { |
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378 'file': v, |
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379 'lfsoid': pointers[v].oid() if pointers[v] else None, |
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380 'lfspointer': templateutil.hybriddict(pointer(v)), |
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381 } |
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382 |
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383 # TODO: make the separator ', '? |
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384 f = templateutil._showcompatlist(context, mapping, 'lfs_file', files) |
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385 return templateutil.hybrid(f, files, makemap, pycompat.identity) |
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386 |
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387 @command('debuglfsupload', |
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388 [('r', 'rev', [], _('upload large files introduced by REV'))]) |
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389 def debuglfsupload(ui, repo, **opts): |
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390 """upload lfs blobs added by the working copy parent or given revisions""" |
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391 revs = opts.get(r'rev', []) |
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392 pointers = wrapper.extractpointers(repo, scmutil.revrange(repo, revs)) |
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393 wrapper.uploadblobs(repo, pointers) |