Git: find all tags, reachable from a commit

Question

How can I list all tags, reachable from a given commit?

For all branches, it is git branch --all --merged <commit>. For most recent tag, it is git describe.

Man page git-tag suggests git tag -l --contains <commit> *, but this command does not show any of the tags which I know are reachable.

Answer 1

use this script to print out all the tags that are in the given branch

git log --decorate=full --simplify-by-decoration --pretty=oneline HEAD | \
sed -r -e 's#^[^\(]*\(([^\)]*)\).*$#\1#' \
-e 's#,#\n#g' | \
grep 'tag:' | \
sed -r -e 's#[[:space:]]*tag:[[:space:]]*##'

The script is simply a 1 long line breaked down to fit in the post window.

Explanation:

git log 

// Print out the full ref name 
--decorate=full 

// Select all the commits that are referred by some branch or tag
// 
// Basically its the data you are looking for
//
--simplify-by-decoration

// print each commit as single line
--pretty=oneline

// start from the current commit
HEAD

// The rest of the script are unix command to print the results in a nice   
// way, extracting the tag from the output line generated by the 
// --decorate=full flag.