Question about the git custom promise type

I have installed the git promise type from:
  * https://build.cfengine.com/modules/promise-type-git/0.2.3/

This is a very simple example but I get an error when run in non-inform 
mode:
```
     git: 
 

         "cf_data_repo" 
 

             repository => "git@<server>:clustercomputing/cf_data", 
 

             destination => "$(git_data_dir)", 
 

             version => "master", 
 

             force => "true", 
 

             ssh_options =>  "-i /root/.ssh/id_ed25519 -o 
IdentitiesOnly=yes", 

             update => "true
```

This is good when we run with the -I flag:
  * cf-agent -IK -f ./update.cf
```
14:17 install3.cc.surfsara.nl:~/bas/cf_masterfiles/working (master)
root# cf-agent -KI -f ./update.cf
     info: Checkout 'git@<server>:clustercomputing/cf_data:master' in 
'/data/cfengine3'
```

And with this one:
  * 14:17 install3.cc.surfsara.nl:~/bas/cf_masterfiles/working (master)
root# cf-agent -K f ./update.cf

```
CRITICAL: Bug in promise module - Failed to log about changes made by a 
repaired git promise with promiser 'cf_data_repo' 
(/root/bas/cf_masterfiles/working/./lib/update/bundle.cf:65)
```

This is due to the fact in the `git.py`:
```
                     if output == "HEAD": 
 

                         detached = True 
 

                         output = self._git( 
 

                             model, 
 

                             [model.executable, "rev-parse", "HEAD"], 
 

                             cwd=model.destination, 
 

                         ) 
 

                     if output != model.version: 
 

                         self.log_info( 
 

                             "Checkout '{repository}:{version}' in 
'{destination}'".format( 

                                 repository=model.repository, 
 

                                 version=model.version, 
 

                                 destination=model.destination, 
 

                             ) 
 

                         ) 
 

                         self._git( 
 

                             model, 
 

                             [model.executable, "checkout", 
model.version], 

                             cwd=model.destination, 
 

                         ) 
 

                         result = Result.REPAIRED
```

the `result line is the cause of the problem. The problem that I want to 
update the `master` branch and the `ouput` is compared against a branch 
name:
```
  verbose: Run: git rev-parse --abbrev-re HEAD
    debug: Received line from module: 
'log_verbose=--abbrev-re\nca3df8de2987a4b2a2e49768de9c7f9fe53349b3'
  verbose: --abbrev-re\nca3df8de2987a4b2a2e49768de9c7f9fe53349b3
```

That is not equal branch name `master`. Is the a bug or did I something 
wrong?



-- 
--
Bas van der Vlies
| High Performance Computing & Visualization | SURF| Science Park 140 | 
1098 XG  Amsterdam
| T +31 (0) 20 800 1300  | [email protected] | www.surf.nl |

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