Create a new reference with the same name as the given reference but a different symbolic target.
The reference must be a symbolic reference, otherwise this will fail.
The new reference will be written to disk, overwriting the given reference.
The target name will be checked for validity. See `ggit_ref_create_symbolic()` for rules about valid names.
| this |
a Ref. |
| target |
The new target for the reference. |
| log_message |
The one line long message to be appended to the reflog. |
|
the newly created Ref or null. |