🇬🇧 When Maven was migrated from SVN to Git the tags didn't pointed to the master, but to a parallel history. This script helped with creating new tags that point to master. 🇧🇬 При мигрирането на Maven от SVN към Git таговете сочеха не към основната история, а към нейни разклонения. Този скрипт помогна да се създадат нови тагове.

migrate-tags.sh

for d in plugins/maven-*; do
    pushd "${d}" > /dev/null

    for tag in $(git tag); do
        commit_sha=$(git rev-list -n1 "refs/tags/${tag}")
        commit_message=$(git show --quiet --pretty="format:%B" "${commit_sha}")
        tree_sha=$(git show --quiet --pretty="format:%T" "${commit_sha}")

        # checking if the tag is reachable from master so the script could be ran multiple times.
        if $( git merge-base --is-ancestor "${tag}" master ) ; then
            echo "${tag} is reachable from master. Skipping."
            continue;
        fi

        if [[ ! ${commit_message} =~ git-svn ]] ; then
           echo "${tag} does not point to an SVN commit and will not be modified"
           continue
       fi

        candidate_commit_sha=$(git rev-list -n1 --grep "\[maven-release-plugin\] prepare release ${tag}$" master);
        if [ -z ${candidate_commit_sha} ] ; then
            echo "Looks like ${tag} is not released with the release plug-in. Skipping."
            continue
        fi

        candidate_tree_sha=$(git show --quiet --pretty="format:%T" "${candidate_commit_sha}")

        if [[ ${tree_sha} != ${candidate_tree_sha} ]] ; then
            echo "${tag} - the commit created by the release plug-in does not have the same files as the tag. Skipping."
            continue
        fi

        # This will change the tag date and author to the current date and git user
        # As we're essentially recreating the tags I think this is ok.
        # The release date and author are preserved in the release commit.
        # The tag message will be changed to only the tag name.
        # NOTE: Uncomment the following line to actually change the tags
        #git tag -f -a -m "${tag}" "${tag}" "${candidate_commit_sha}" > /dev/null
    done

    popd > /dev/null
done