$ git clone -n https://src.fedoraproject.org/rpms/transmission-remote-gtk.git /var/lib/mock/f40-build-1443627-23577/root/chroot_tmpdir/scmroot/transmission-remote-gtk
Cloning into '/var/lib/mock/f40-build-1443627-23577/root/chroot_tmpdir/scmroot/transmission-remote-gtk'...
$ git fetch origin 4ed39cbd67a8f0373d0b14177817486f7ecb40b2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/transmission-remote-gtk
 * [new ref]         4ed39cbd67a8f0373d0b14177817486f7ecb40b2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4ed39cb Modernize spec