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1e7f961055
The command `get_git_commit` shows quite a little information and
especially if mistakes are made it is hard to verify what the binary is
actually based on.
This commit extends the function to provide some more information:
specifically the SHA of the HEAD regardless of whether there is a tag
on it or not and the time for the HEAD commit.
```
postgres=# select * from _timescaledb_internal.get_git_commit();
commit_tag | commit_hash | commit_time
--------------------------+-------------+------------------------
1.7.4-10-g09b0b778-dirty | 09b0b778 | 2020-09-13 17:50:38+02
(1 row)
```
If git is not installed, the function `get_git_commit` will return an
error indicating that no git information is available. If some of the
fields are available, they will be emitted and the remaining fields
will be NULL.
Fixes #2457