Join repos into subfolders with flat history

join.sh

#!/bin/bash
set -euo pipefail

$REPO_DIR=~/devel
repos="1password bitwarden dashlane lastpass opvault passwordbox roboform stickypassword truekey zoho-vault"

# pull all repos
(
    for repo in $repos; do
        echo $repo
        cd $REPO_DIR/$repo
        git pull -v --ff
    done
)

# merge
(
    rm -rf joined
    mkdir joined
    cd joined

    git init .

    for repo in $repos; do
        git remote add $repo ~/devel/$repo-sharp
        git fetch $repo
        git checkout -b $repo $repo/master
        echo -n "$repo: " > prefix
        git filter-branch \
            -f \
            --tree-filter "mkdir -p .original/$repo && rsync -a --remove-source-files ./ .original/$repo/" \
            --msg-filter "cat $(pwd)/prefix -" \
            --env-filter 'GIT_COMMITTER_DATE="$GIT_AUTHOR_DATE"' \
            $repo
        rm prefix
    done

    # create master
    git checkout --orphan master
    git rm -rf .

    # cherry pick into the master
    for i in $(git log --pretty='%H' --author-date-order --reverse $repos); do
        GIT_COMMITTER_DATE=$(git log -1 --pretty='%at' $i) \
            git cherry-pick $i
    done

    # cleanup
    for repo in $repos; do
        git branch -D $repo
        git remote remove $repo
        git update-ref -d refs/original/refs/heads/$repo
    done

    git gc --aggressive
)

I suck at git and bash, but I couldn't get this to work.

I had Gemini write a new script:

https://gist.github.com/mindplay-dk/55f8a8f81049b2fd7f44dff3623659b2

This basically works - the only issue is I end up with giant, monolithic merge commit with a comment like feat: Merge repository 'backend', which is very much unwanted.

I don't know what your script does, because I couldn't get it to work.

Anyway, this sort of, mostly works, and I guess I could live with the result - but the resulting git history is definitely not optimal.

Ideally, I'd want a history that really looks like all of those commits were always made in a single repo with two (or more) subfolders.

I don't know if that's possible...

I can't believe there isn't a finished tool/script that does this, but I've looked seriously everywhere - there are tons of tools that can probably do this and a gazillion other things if you know how, but I am not at that level of git or bash knowledge...

Maybe someone else will see this and try to figure it out... 😌