$ git clone -n https://src.fedoraproject.org/rpms/magicmirror-module-onthisday.git /var/lib/mock/f38-build-side-42-init-devel-1086316-30027/root/chroot_tmpdir/scmroot/magicmirror-module-onthisday
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1086316-30027/root/chroot_tmpdir/scmroot/magicmirror-module-onthisday'...
$ git fetch origin fcd18c79306c0423a0842480fd3f3a8accf2762c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/magicmirror-module-onthisday
 * [new ref]         fcd18c79306c0423a0842480fd3f3a8accf2762c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fcd18c7 Initial import; Fixes: RHBZ#2103403