$ git clone -n https://src.fedoraproject.org/rpms/keyrings-filesystem.git /var/lib/mock/f45-build-14723-463/root/chroot_tmpdir/scmroot/keyrings-filesystem
Cloning into '/var/lib/mock/f45-build-14723-463/root/chroot_tmpdir/scmroot/keyrings-filesystem'...
$ git fetch origin 4893fbae9d5d741984cf8ba94affd66248cadc0a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/keyrings-filesystem
 * [new ref]         4893fbae9d5d741984cf8ba94affd66248cadc0a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4893fba Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild