$ git clone -n https://src.fedoraproject.org/rpms/plymouth-theme-breeze.git /var/lib/mock/f42-build-side-1-3505169-45989/root/chroot_tmpdir/scmroot/plymouth-theme-breeze
Cloning into '/var/lib/mock/f42-build-side-1-3505169-45989/root/chroot_tmpdir/scmroot/plymouth-theme-breeze'...
$ git fetch origin db55c2ce9d33354f9ec0e1f3179fb06c03ad372d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plymouth-theme-breeze
 * [new ref]         db55c2ce9d33354f9ec0e1f3179fb06c03ad372d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at db55c2c 6.3.4