Script to rename Git tags from X.Y.Z to vX.Y.Z

fixtags.sh

#!/bin/sh

git for-each-ref --shell --format="ref=%(refname:short)" refs/tags | \
while read entry
do

    # assign tag name to $ref variable
    eval "$entry"

    # test if $ref starts with v
    ref2="v${ref#v}"
    if [ "${ref}" != "${ref2}" ]; then

        # rename/delete tag
        git push origin refs/tags/${ref}:refs/tags/${ref2} :refs/tags/${ref}
        git tag -d ${ref}
    fi

done