$ git clone -n https://src.fedoraproject.org/rpms/seahorse.git /var/lib/mock/f41-build-side-1-2771249-32218/root/chroot_tmpdir/scmroot/seahorse
Cloning into '/var/lib/mock/f41-build-side-1-2771249-32218/root/chroot_tmpdir/scmroot/seahorse'...
$ git fetch origin a17b84d26ad0c998bf69794bded672f3177e0f01:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/seahorse
 * [new ref]         a17b84d26ad0c998bf69794bded672f3177e0f01 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a17b84d Update to 47.0.1