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 it 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"))
   

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

5. Run the following command so Unit can access the application directory:

   # chown -R unit:unit /path/to/app/
   

   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):

   {
       "listeners": {
           "*:80": {
               "pass": "applications/hg"
           }
       },
   
       "applications": {
           "hg": {
               "type": "python",
               "path": "/path/to/app/",
               "module": "hgweb"
           }
       }
   }
   

7. Upload the updated configuration. Assuming the JSON above was added to config.json:

   # curl -X PUT --data-binary @config.json --unix-socket \
          /path/to/control.unit.sock http://localhost/config/
   

   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:

   $ hg config --edit
   

   $ hg clone http://localhost/ project/
   

   $ cd project/
   

   $ touch hg_rocks.txt
   

   $ hg add
   

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

   $ hg push