Get the latest tag for every git repo in a directory

git-get-latest-tag.sh

#!/usr/bin/env bash

function is_git_repo() {
    ls .git &> /dev/null
}

function get_latest_tag_for_repo() {
    pushd ${1} &> /dev/null
    is_git_repo
    local is_git_repo=$?
    if [[ ${is_git_repo} != 0 ]]; then
        popd &> /dev/null
        return 0
    fi

    echo "$(basename ${1}) $(git describe --tags --always)"
    popd &> /dev/null
}

export -f get_latest_tag_for_repo is_git_repo

REPOS_PATH="${REPOS_PATH:=./}"

# Check if GNU parallell is installed
command -v parallel &> /dev/null
HAS_GNU_PARALLEL_RC=$?

# Pull all repos under the directory simultaneously
if [[ ${HAS_GNU_PARALLEL_RC} == 0 ]]; then
    ls -d ${REPOS_PATH}/*/ | parallel get_latest_tag_for_repo
else
    for dir in $(ls -d ${REPOS_PATH}/*/); do
        (get_latest_tag_for_repo ${dir}) &
    done

    # Wait for all jobs to complete
    while [[ ! -z $(jobs -r) ]]; do
        sleep 1
    done
fi

echo "Done."
exit 0