[SOLVED] How do I read tagger information from a GIT tag?

How do I read tagger information from a GIT tag?

So far I have:

git rev-parse <tagname> | xargs git cat-file -p

but this isn't the easiest thing to parse. I was hoping for something similar to git-log's --pretty option so I could grab just the info I need.

Any ideas?

Solution

This has already been answered a long time ago but still is the top search result even though it's not the best solution anymore, so here it goes:

Command:

git for-each-ref refs/tags/$TAG --shell --format='
TAG=%(refname)
TYPE=%(objecttype)
COMMIT=%(objectname)
TAGGER=%(tagger)
EMAIL=%(taggeremail)
DATE=%(taggerdate)
CONTENTS=%(contents)
'

--shell does the quoting for Shell scripts. There is also --perl, --python and --tcl. If you don't want to write whole format as a command line option, you can also put it in a file.txt and do this:

git for-each-ref refs/tags/<tag> --shell --format="$(cat file.txt)"

Output:

TAG='refs/tags/4.1.0-RC1'
TYPE='tag'
COMMIT='973cc103f942330550866588177fe53ea5765970'
TAGGER='ml_'
EMAIL='<ml@example.org>'
DATE='Fri Sep 16 14:14:50 2016 +0200'
CONTENTS='Release 3:
* INSTALL.md added.
* GIT.md modified.
'

More information here: https://git-scm.com/docs/git-for-each-ref