$ git clone -n https://src.fedoraproject.org/rpms/perl-GStreamer1.git /var/lib/mock/f41-build-1153742-21307/root/chroot_tmpdir/scmroot/perl-GStreamer1
Cloning into '/var/lib/mock/f41-build-1153742-21307/root/chroot_tmpdir/scmroot/perl-GStreamer1'...
$ git fetch origin c5188b2c81547c1db05187088f344eadda7c0cd5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-GStreamer1
 * [new ref]         c5188b2c81547c1db05187088f344eadda7c0cd5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c5188b2 Eliminate use of obsolete %patchN syntax (#2283636)