Change 660081 had a related patch set uploaded (by Krinkle; owner: Krinkle):
[mediawiki/core@master] CSSMin: Remove old IE8 compat code and warn for too-large embeds

https://gerrit.wikimedia.org/r/660081

• Created empty mediawiki/libs/Minify repo in Gerrit.
• Created empty mediawiki-libs-Minify repo on GitHub.

Next: Import filtered history from MediaWiki core.

Importing history

I considered using git filter-branch which I had used numerous times before for VisualEditor, OOjs, OOUI, and CSSJanus. However, the MediaWiki core repository is at least one or two orders of magnitude larger and I had to abort after several failed attempts filtering at less than 1% progress after 10-20 minutes.

Instead, I stumbled upon git filter-repo which was recommended in the upstream Git docs, and it is amazing. Note only is it blazingly fast, it also far more intuitive to use for these kinds of purposes (where you mainly want to specify what to preserve, as opposed to what to remove). Plus, it has numerous cool features out of the box, such as moving release tags to the nearest older commit when removing non-matching commits.

1. (If you haven't already, per mw.org) Import SVN-era git-notes in your MediaWiki checkout: git fetch origin refs/notes/commits:refs/notes/commits
2. (If you haven't already, per mw.org) Import Gerrit git-notes in your MediaWiki checkout: git fetch origin refs/notes/review:refs/notes/review
3. Create mediawiki-libs-Minify directory locally as a clone of MediaWiki at first. E.g. git clone ./mediawiki/.git mediawiki-libs-Minify. This is pretty fast when you point it to your existing MediaWiki core checkout instead of a Gerrit URL.
4. Copy over notes: git fetch ../mediawiki refs/notes/commits:refs/notes/commits
5. Filter the repo: git filter-repo --path includes/libs/CSSMin.php --path includes/libs/JavaScriptMinifier.php --path includes/CSSMin.php --path includes/JavaScriptMinifier.php --path tests/phpunit/includes/libs/CSSMinTest.php --path tests/phpunit/unit/includes/libs/JavaScriptMinifierTest.php --path tests/phpunit/includes/libs/JavaScriptMinifierTest.php --path LICENSE --path COPYING
6. Restore git-notes references (per git-filter-repo#22):

git for-each-ref refs/replace/ --format='%(objectname) %(objecttype) %(refname:lstrip=2)' \
| while read new type old; do
    if [ "$type" != "commit" ]; then
        exit 1
    fi

    git notes copy $old $new
    git notes remove $old
done

6. Ensure further rebases and amends that change SHA1 hashes (temporarily) do retain git-notes associations:

git config notes.rewrite.rebase true
git config notes.rewrite.amend true

7. Make any further clean ups as you see fit. For example, I used this to squash some ancient edits to secondary files like COPYING, into the first commit that I wanted to become the initial commit ("add resourceloader to trunk"). Using: git rebase --root -i --committer-date-is-author-date. Here leave out, re-order, etc as you see fit. When you want to squash an old commit into a newer one, that I find easiest is to remember the newer SHA1, then let interactive rebase fix it away into the older one (don't re-arrange as it may lead to pointless merge conflicts), then amend it with the correct author/date by using git commit --amend -C NEWER_TARGETS_SHA1_HERE.
8. Copy SVN and Gerrit code review URLs from git-notes into the commit message for convenience.

# Add "SVN: <url>" footer to commit message (incl empty line since SVN commits didn't have a footer yet)
#
# It copies from the local git-notes data that we imported already and was preserved so far.
#
# Before:
#   (bug 25546) Feed argument
#
# After:
#   (bug 25546) Feed argument
#
#   SVN: http://mediawiki.org/wiki/Special:Code/MediaWiki/74946
#
K_GITNOTE="$(git notes show || true)"; test -z "$K_GITNOTE" || (K_OLDMSG="$(git log --format=%B -n 1)"; git commit --amend -m "$(printf "$K_OLDMSG\n\nSVN: $K_GITNOTE\n")");

# Copy "Reviewed-on: <url>" field from Gerrit git-notes into the commit message.
#
# We can't copy this from the local notes data. I tried but association got lost (I don't recall why),
# but unlike for SVN commits, with Gerrit commits we can simply use
# `GIT_DIR=… git log --grep="Change-Id: …"` to get this from our local MW checkout.
# This is actually surprisingly fast, even for very old commits from a repo as large as MW 
#
# Before:
#   Fix typos
#
#   Bug: T201491
#   Change-Id: I25a27d11faabe2f5fa02950c7a4fb58b13fb3662
#
# After:
#   Fix typos
#
#   Bug: T201491
#   Change-Id: I25a27d11faabe2f5fa02950c7a4fb58b13fb3662
#   Reviewed-on: https://gerrit.wikimedia.org/r/452630
#
git rebase $FIRST_GERRIT_COMMIT_HERE -i --committer-date-is-author-date --exec 'K_GERRITID=$(git log -1 --format=%b | grep "Change-Id:" | head -n1 || true) && test -n "$K_GERRITID" && K_REVIEWLINE=$(GIT_DIR=/Users/krinkle/Development/mediawiki/.git git log --notes=review --grep="$K_GERRITID" -1 --format=%N | grep "Reviewed-on:" || true) && test -n "$K_REVIEWLINE" && K_OLDMSG=$(git log --format=%B -n 1) && git commit --amend -m "$(printf "$K_OLDMSG\n$K_REVIEWLINE\n")"'

9. Clean up

git update-ref -d refs/notes/commits
git gc --prune=all --aggressive

10. Add Gerrit remote and push (temporarily set Gerrit repo permissions to alllow pushes, and merge commits, and forged committers, and forged authors).

Change 660081 abandoned by Krinkle:
[mediawiki/core@master] CSSMin: Remove old IE8 compat code and warn for too-large embeds

Reason:
Will re-submit in the new repo to avoid more divergence than needed.

https://gerrit.wikimedia.org/r/660081

Change 661282 had a related patch set uploaded (by Krinkle; owner: Krinkle):
[mediawiki/libs/Minify@master] Set up wikimedia/minify repository

https://gerrit.wikimedia.org/r/661282

Change 661284 had a related patch set uploaded (by Krinkle; owner: Krinkle):
[integration/config@master] Add CI jobs for mediawiki/libs/Minify

https://gerrit.wikimedia.org/r/661284

Change 661284 merged by jenkins-bot:
[integration/config@master] Add CI jobs for mediawiki/libs/Minify

https://gerrit.wikimedia.org/r/661284

Mentioned in SAL (#wikimedia-releng) [2021-02-04T00:17:03Z] <James_F> Zuul: [mediawiki/libs/Minify] Install initial CI T273247

Change 662785 had a related patch set uploaded (by Krinkle; owner: Krinkle):
[integration/docroot@master] doc: Add wikimedia/minify

https://gerrit.wikimedia.org/r/662785

Change 661282 merged by jenkins-bot:
[mediawiki/libs/Minify@master] Set up wikimedia/minify library

https://gerrit.wikimedia.org/r/661282

Mentioned in SAL (#wikimedia-releng) [2021-02-09T04:42:59Z] <Krinkle> Submitted wikimedia/minify to Packagist. https://packagist.org/packages/wikimedia/minify ref T273247

Change 662785 merged by jenkins-bot:
[integration/docroot@master] doc: Add wikimedia/minify

https://gerrit.wikimedia.org/r/662785

Mentioned in SAL (#wikimedia-operations) [2021-02-09T05:02:09Z] <krinkle@deploy1001> Started deploy [integration/docroot@fdfb265]: I271e6054880, T273247

Mentioned in SAL (#wikimedia-operations) [2021-02-09T05:02:16Z] <krinkle@deploy1001> Finished deploy [integration/docroot@fdfb265]: I271e6054880, T273247 (duration: 00m 06s)

Change 663099 had a related patch set uploaded (by Krinkle; owner: Krinkle):
[mediawiki/core@master] resourceloader: Add wikimedia/minify package and remove local copies

https://gerrit.wikimedia.org/r/663099

Change 663100 had a related patch set uploaded (by Krinkle; owner: Krinkle):
[mediawiki/libs/Minify@master] tests: Add benchmarks

https://gerrit.wikimedia.org/r/663100

Change 663101 had a related patch set uploaded (by Krinkle; owner: Krinkle):
[mediawiki/vendor@master] Add wikimedia/minify 2.0.0

https://gerrit.wikimedia.org/r/663101

Change 663100 merged by jenkins-bot:
[mediawiki/libs/Minify@master] tests: Add benchmarks

https://gerrit.wikimedia.org/r/663100

Change 663896 had a related patch set uploaded (by Krinkle; owner: Krinkle):
[mediawiki/libs/Minify@master] CSSMin: Add global legacy class alias

https://gerrit.wikimedia.org/r/663896

Change 663896 merged by jenkins-bot:
[mediawiki/libs/Minify@master] CSSMin: Add global legacy class alias

https://gerrit.wikimedia.org/r/663896

Change 663101 merged by jenkins-bot:
[mediawiki/vendor@master] Add wikimedia/minify 2.1.0

https://gerrit.wikimedia.org/r/663101

Change 663099 merged by jenkins-bot:
[mediawiki/core@master] resourceloader: Add wikimedia/minify package and remove local copies

https://gerrit.wikimedia.org/r/663099