$ git clone -n https://src.fedoraproject.org/rpms/alembic.git /var/lib/mock/f42-build-side-1-3500323-45970/root/chroot_tmpdir/scmroot/alembic
Cloning into '/var/lib/mock/f42-build-side-1-3500323-45970/root/chroot_tmpdir/scmroot/alembic'...
$ git fetch origin fc6995a6ac977ace9e8a1b1e2f6e7ff5a0b7af2c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/alembic
 * [new ref]         fc6995a6ac977ace9e8a1b1e2f6e7ff5a0b7af2c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fc6995a Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild