How do I determine what branch/tag I have checked out in git?

Question

I clone my source using git clone https://gerrit.wikimedia.org/r/p/mediawiki/core.git w/. Then I specify a specific branch/tag by doing git checkout

Answer 1

git branch

tells you what branch you're on (with a * marker).

Tags are just names for revisions, so Git won't tell you that you're "on" a tag, but you can use git name-rev HEAD to get a sense for what it might be.