$ git clone -n https://src.fedoraproject.org/rpms/alembic.git /var/lib/mock/f40-build-2282205-55531/root/chroot_tmpdir/scmroot/alembic
Cloning into '/var/lib/mock/f40-build-2282205-55531/root/chroot_tmpdir/scmroot/alembic'...
$ git fetch origin 21e7a00366884973f6e5922f1afbe495594ffc5b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/alembic
 * [new ref]         21e7a00366884973f6e5922f1afbe495594ffc5b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 21e7a00 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild