git-push-submodule-change

#!/bin/bash
# git-push-submodule-change: push a change to a submodule and then
# walk back up the tree, pushing as you go.
# By Christopher White <cwhite@d3engineering.com>
# Copyright (c) 2020 D3 Engineering, LLC.

set -eEuo pipefail

# --- main() --------------------------------------------------------------

function main() {

    # Args
    if (( $# < 1 )); then
        echo "Usage: $0 '<commit message here>' ['commit message in parents']" 1>&2
        return 1
    fi

    local -r msg_here="$1"
    if (( $# > 1 )); then
        local -r msg_next="$2"
    else
        local -r msg_next="$msg_here"
    fi

    # Work
    local last_repo_root=''
    local next_repo_root
    next_repo_root="$(next_repo_up)"
    local last_dir=''
    local next_dir="$PWD"

    local msg="$msg_here"

    while [[ "$last_repo_root" != "$next_repo_root" ]]; do
        echo "last $last_repo_root; next $next_repo_root; here $next_dir"

        if [[ ! "$last_dir" ]]; then
            git add .
        else
            git add "$last_dir"
        fi

        git commit -m "$msg"

        git push

        # Iterate
        last_repo_root="$next_repo_root"
        last_dir="$next_dir"

        cd "$next_repo_root" || return 1
        next_repo_root="$(next_repo_up)"
        next_dir="$PWD"

        msg="$msg_next"
    done
}

# --- Helpers -------------------------------------------------------------

# Get the root directory of the next repo up.
function next_repo_up() {
    git rev-parse --show-superproject-working-tree
}

# --- Go, Speed Racer! ----------------------------------------------------

main "$@"