$ git clone -n https://src.fedoraproject.org/rpms/rubygem-gio2.git /var/lib/mock/f41-build-859040-168533/root/chroot_tmpdir/scmroot/rubygem-gio2
Cloning into '/var/lib/mock/f41-build-859040-168533/root/chroot_tmpdir/scmroot/rubygem-gio2'...
$ git fetch origin 69eb6205252699444bd18d1c1b20d07cadf21fcc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-gio2
 * [new ref]         69eb6205252699444bd18d1c1b20d07cadf21fcc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 69eb620 4.2.4 entry