Mercurial

To install and run the Mercurial source control system using Unit:

1. Install Unit with a Python language module.

2. Install Mercurial’s core files. Here we install them at /path/to/app; use a real path in your configuration.

3. Optionally, configure a repository or choose an existing one, noting its directory path.

4. Unit uses WSGI to run Python apps, so it requires a wrapper script to publish a Mercurial repo. Here, it’s /path/to/app/hgweb.py (note the extension); the application callable is the entry point:

from mercurial.hgweb import hgweb

 # path to a repo or a hgweb config file to serve in UTF-8 (see 'hg help hgweb')
 application = hgweb("/path/to/app/repo/or/config/file".encode("utf-8"))  # Replace with a real path in your configuration

This is a very basic script; to elaborate on it, see the Mercurial repo publishing guide.

5. Change ownership:

   Run the following command (as root) so Unit can access the application directory (If the application uses several directories, run the command for each one):

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   # chown -R unit:unit /path/to/app/  # User and group that Unit's router runs as by default
      

   Note:
   The unit:unit user-group pair is available only with official packages , Docker images, and some third-party repos. Otherwise, account names may differ; run the ps aux | grep unitd command to be sure.

   For further details, including permissions, see the security checklist.

6. Next, prepare the Mercurial configuration for Unit (use a real value for path):

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   {
      "listeners": {
         "*:80": {
               "pass": "applications/hg"
         }
      },
   
      "applications": {
         "hg": {
               "type": "python",
               "path": "/path/to/app/",
               "_comment_path": "Path to the WSGI file referenced by the module option; use a real path in your configuration",
               "module": "hgweb",
               "_comment_module": "WSGI module basename with extension omitted"
         }
      }
   }
   

7. Upload the updated configuration.

   Assuming the JSON above was added to config.json. Run the following command as root:

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   # curl -X PUT --data-binary @config.json --unix-socket \
         /path/to/control.unit.sock \  # Path to Unit's control socket in your installation
         http://localhost/config/      # Path to the config section in Unit's control API
      

   Note:
   The control socket path may vary; run unitd -h or see Startup and shutdown for details.

   After a successful update, you can proceed to work with your Mercurial repository as usual:

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   hg config --edit
   

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   hg clone http://localhost/ project/
   

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   cd project/
   

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   touch hg_rocks.txt
   

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   hg add
   

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   hg commit -m 'Official: Mercurial on Unit rocks!'
   

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   hg push