$ git clone -n https://src.fedoraproject.org/rpms/mirrormagic.git /var/lib/mock/f42-build-3402178-45132/root/chroot_tmpdir/scmroot/mirrormagic
Cloning into '/var/lib/mock/f42-build-3402178-45132/root/chroot_tmpdir/scmroot/mirrormagic'...
$ git fetch origin fb735f2b1ef173e8efb559a26a908d57ef1b32ed:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mirrormagic
 * [new ref]         fb735f2b1ef173e8efb559a26a908d57ef1b32ed -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fb735f2 Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild