$ git clone -n https://src.fedoraproject.org/rpms/dolphin.git /var/lib/mock/f45-build-109626-17226/root/chroot_tmpdir/scmroot/dolphin
Cloning into '/var/lib/mock/f45-build-109626-17226/root/chroot_tmpdir/scmroot/dolphin'...
$ git fetch origin 783255720c68d0000f192a75eb4f0533cd0ce5fa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/dolphin
 * [new ref]         783255720c68d0000f192a75eb4f0533cd0ce5fa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7832557 26.07.90