Changes between Initial Version and Version 1 of TracRepositoryAdmin


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Timestamp:
02/08/2011 05:01:16 PM (7 years ago)
Author:
trac
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  • TracRepositoryAdmin

    v1 v1  
     1= Repository Administration = 
     2[[PageOutline(2-3)]] 
     3 
     4== Quick start == #QuickStart 
     5 
     6 * Manage repositories in the "Repository" admin panel, with `trac-admin` or in the `[repositories]` section of [wiki:TracIni#repositories-section trac.ini]. 
     7 * Set up a call to `trac-admin $ENV changeset added $REPO $REV` in the post-commit hook of each repository. Additionally, add a call to `trac-admin $ENV changeset modified $REPO $REV` in the post-revprop-change hook of repositories allowing revision property changes. 
     8 * Set the `[trac] repository_sync_per_request` option to an empty value to disable per-request syncing. 
     9 * Make sure the user under which your Subversion hooks are run has write access to the Trac environment, or use a tool like `sudo` to temporarily elevate privileges. 
     10 
     11== Specifying repositories == #Repositories 
     12Starting with 0.12, Trac can handle more than one repository per environment. The pre-0.12 way of specifying the repository with the `repository_dir` and `repository_type` options in the `[trac]` section of [wiki:TracIni trac.ini] is still supported, but two new mechanisms allow including additional repositories into an environment. 
     13 
     14It is also possible to define aliases of repositories, that act as "pointers" to real repositories. This can be useful when renaming a repository, to avoid breaking all the links to the old name. 
     15 
     16A number of attributes can be associated with each repository, which define the repository's location, type, name and how it is displayed in the source browser. The following attributes are supported: 
     17 
     18||='''Attribute''' =||='''Description''' =|| 
     19||`alias` ||\ 
     20||A repository having an `alias` attribute is an alias to a real repository. All TracLinks referencing the alias resolve to the aliased repository. Note that multiple indirection is not supported, so an alias must always point to a real repository. The `alias` and `dir` attributes are mutually exclusive. || 
     21||`description` ||\ 
     22||The text specified in the `description` attribute is displayed below the top-level entry for the repository in the source browser. It supports WikiFormatting. || 
     23||`dir` ||\ 
     24||The `dir` attribute specifies the location of the repository in the filesystem. It corresponds to the value previously specified in the option `[trac] repository_dir`. The `alias` and `dir` attributes are mutually exclusive. || 
     25||`hidden` ||When set to `true`, the repository is hidden from the repository index page in the source browser. Browsing the repository is still possible, and links referencing the repository remain valid. || 
     26||`name` ||The `name` attribute specifies the leading path element to the repository. || 
     27||`type` ||The `type` attribute sets the type of version control system used by the repository. Trac supports Subversion out-of-the-box, and plugins add support for many other systems. If `type` is not specified, it defaults to the value of the `[trac] repository_type` option. || 
     28||`url` ||The `url` attribute specifies the root URL to be used for checking out from the repository. When specified, a "Repository URL" link is added to the context navigation links in the source browser, that can be copied into the tool used for creating the working copy. || 
     29 
     30The `name` attribute and one of `alias` or `dir` are mandatory. All others are optional. 
     31 
     32After adding a repository, the cache for that repository must be re-synchronized once with the `trac-admin $ENV repository resync` command. 
     33 
     34 `repository resync <repos>`:: 
     35   Re-synchronize Trac with a repository. 
     36 
     37 
     38=== In `trac.ini` === #ReposTracIni 
     39Repositories and repository attributes can be specified in the `[repositories]` section of [wiki:TracIni#repositories-section trac.ini]. Every attribute consists of a key structured as `{name}.{attribute}` and the corresponding value separated with an equal sign (`=`). The name of the default repository is empty. 
     40 
     41The main advantage of specifying repositories in `trac.ini` is that they can be inherited from a global configuration (see the [wiki:TracIni#GlobalConfiguration global configuration] section of TracIni). One drawback is that, due to limitations in the `ConfigParser` class used to parse `trac.ini`, the repository name is always all-lowercase. 
     42 
     43The following example defines two Subversion repositories named `project` and `lib`, and a hidden alias to `project` as the default repository. This is a typical use case where a Trac environment previously had a single repository (the `project` repository), and was converted to multiple repositories. The alias ensures that links predating the change continue to resolve to the `project` repository. 
     44{{{ 
     45#!ini 
     46[repositories] 
     47project.dir = /var/repos/project 
     48project.description = This is the ''main'' project repository. 
     49project.type = svn 
     50project.url = http://example.com/svn/project 
     51lib.dir = /var/repos/lib 
     52lib.description = This is the secondary library code. 
     53lib.type = svn 
     54lib.url = http://example.com/svn/lib 
     55.alias = project 
     56.hidden = true 
     57}}} 
     58Note that `name.alias = target` makes `name` an alias for the `target` repo, not the other way around. 
     59 
     60=== In the database === #ReposDatabase 
     61Repositories can also be specified in the database, using either the "Repositories" admin panel under "Version Control", or the `trac-admin $ENV repository` commands. 
     62 
     63The admin panel shows the list of all repositories defined in the Trac environment. It allows adding repositories and aliases, editing repository attributes and removing repositories. Note that repositories defined in `trac.ini` are displayed but cannot be edited. 
     64 
     65The following [wiki:TracAdmin trac-admin] commands can be used to perform repository operations from the command line. 
     66 
     67 `repository add <repos> <dir> [type]`:: 
     68   Add a repository `<repos>` located at `<dir>`, and optionally specify its type. 
     69 
     70 `repository alias <name> <target>`:: 
     71   Create an alias `<name>` for the repository `<target>`. 
     72 
     73 `repository remove <repos>`:: 
     74   Remove the repository `<repos>`. 
     75 
     76 `repository set <repos> <key> <value>`:: 
     77   Set the attribute `<key>` to `<value>` for the repository `<repos>`.  
     78 
     79Note that the default repository has an empty name, so it will likely need to be quoted when running `trac-admin` from a shell. Alternatively, the name "`(default)`" can be used instead, for example when running `trac-admin` in interactive mode. 
     80 
     81 
     82== Repository synchronization == #Synchronization 
     83Prior to 0.12, Trac synchronized its cache with the repository on every HTTP request. This approach is not very efficient and not practical anymore with multiple repositories. For this reason, explicit synchronization through post-commit hooks was added.  
     84 
     85There is also new functionality in the form of a repository listener extension point ''(IRepositoryChangeListener)'' that is triggered by the post-commit hook when a changeset is added or modified, and can be used by plugins to perform actions on commit. 
     86 
     87=== Mercurial Repositories === 
     88Please note that at the time of writing, no initial resynchronization or any hooks are necessary for Mercurial repositories - see [trac:#9485] for more information.  
     89 
     90=== Explicit synchronization === #ExplicitSync 
     91This is the preferred method of repository synchronization. It requires setting the `[trac]  repository_sync_per_request` option in [wiki:TracIni#trac-section trac.ini] to an empty value, and adding a call to `trac-admin` in the post-commit hook of each repository. Additionally, if a repository allows changing revision metadata, a call to `trac-admin` must be added to the post-revprop-change hook as well. 
     92 
     93 `changeset added <repos> <rev> [...]`:: 
     94   Notify Trac that one or more changesets have been added to a repository. 
     95 
     96 `changeset modified <repos> <rev> [...]`:: 
     97   Notify Trac that metadata on one or more changesets in a repository has been modified. 
     98 
     99The `<repos>` argument can be either a repository name (use "`(default)`" for the default repository) or the path to the repository. 
     100 
     101Note that you may have to set the environment variable PYTHON_EGG_CACHE to the same value as was used for the web server configuration before calling trac-admin, if you changed it from its default location. See [wiki:TracPlugins Trac Plugins] for more information. 
     102 
     103The following examples are complete post-commit and post-revprop-change scripts for Subversion. They should be edited for the specific environment, marked executable (where applicable) and placed in the `hooks` directory of each repository. On Unix (`post-commit`): 
     104{{{#!sh 
     105#!/bin/sh 
     106export PYTHON_EGG_CACHE="/path/to/dir" 
     107/usr/bin/trac-admin /path/to/env changeset added "$1" "$2" 
     108}}} 
     109On Windows (`post-commit.cmd`): 
     110{{{#!application/x-dos-batch 
     111@C:\Python26\Scripts\trac-admin.exe C:\path\to\env changeset added "%1" "%2" 
     112}}} 
     113 
     114The post-revprop-change hook for Subversion is very similar. On Unix (`post-revprop-change`): 
     115{{{#!sh 
     116#!/bin/sh 
     117export PYTHON_EGG_CACHE="/path/to/dir" 
     118/usr/bin/trac-admin /path/to/env changeset modified "$1" "$2" 
     119}}} 
     120On Windows (`post-revprop-change.cmd`): 
     121{{{#!application/x-dos-batch 
     122@C:\Python26\Scripts\trac-admin.exe C:\path\to\env changeset modified "%1" "%2" 
     123}}} 
     124 
     125The Unix variants above assume that the user running the Subversion commit has write access to the Trac environment, which is the case in the standard configuration where both the repository and Trac are served by the web server. If you access the repository through another means, for example `svn+ssh://`, you may have to run `trac-admin` with different privileges, for example by using `sudo`. 
     126 
     127Note that calling `trac-admin` in your Subversion hooks can slow down the commit and log editing operations on the client side. You might want to use the [trac:source:trunk/contrib/trac-svn-hook contrib/trac-svn-hook] script which starts `trac-admin` in an asynchronous way. The script also comes with a number of safety checks and usage advices which should make it easier to set up and test your hooks. There's no equivalent `trac-svn-hook.bat` for Windows yet, but the script can be run by Cygwin's bash. 
     128 
     129See the [http://svnbook.red-bean.com/en/1.5/svn.reposadmin.create.html#svn.reposadmin.create.hooks section about hooks] in the Subversion book for more information. Other repository types will require different hook setups. Please see the plugin documentation for specific instructions. 
     130 
     131=== Per-request synchronization === #PerRequestSync 
     132If the post-commit hooks are not available, the environment can be set up for per-request synchronization. In that case, the `[trac] repository_sync_per_request` option in [wiki:TracIni#trac-section trac.ini] must be set to a comma-separated list of repository names to be synchronized. 
     133 
     134Note that in this case, the changeset listener extension point is not called, and therefore plugins using it will not work correctly. 
     135 
     136 
     137== Migration from a single-repository setup (Subversion) == #Migration 
     138The following procedure illustrates a typical migration from a Subversion single-repository setup to multiple repositories. 
     139 
     140 1. Remove the default repository specification from the `[trac] repository_dir` option. 
     141 1. Add the "main" repository as a named repository. 
     142 1. Re-synchronize the main repository. 
     143 1. Set up post-commit and post-revprop-change hooks on the main repository, and set `[trac] repository_sync_per_request` to an empty value. 
     144 1. Add a hidden alias to the main repository as the default repository. This ensures that all links predating the migration still resolve to the main repository. 
     145 1. Repeat steps 2, 3 and 4 to add other (named) repositories as needed. 
     146 
     147== Migration from a single-repository setup (Mercurial) == #MigrationMercurial 
     148The following procedure illustrates a typical migration from a Mercurial single-repository setup to multiple repositories. Please note that at the time of writing, no initial resynchronization or any hooks are necessary for Mercurial repositories - see #9485 for more information. 
     149 
     150 1. Upgrade to the latest version of the TracMercurial plugin. 
     151 1. Remove the default repository specification from the `[trac] repository_dir` option. 
     152 1. Add the "main" repository as a named repository. 
     153 1. Add a hidden alias to the main repository as the default repository. This ensures that all links predating the migration still resolve to the main repository. 
     154 1. Repeat step 3 to add other (named) repositories as needed. 
     155 
     156== Troubleshooting == 
     157 
     158=== My trac-post-commit-hook doesn't work anymore === #trac-post-commit-hook 
     159 
     160You must now use the optional components from `tracopt.ticket.commit_updater.*`, which you can activate through the Plugins panel in the Administrative part of the web interface, or by directly modifying the [TracIni#components-section "[components]"] section in the trac.ini. Be sure to use [#ExplicitSync explicit synchronization] as explained above.