$ git clone -n https://src.fedoraproject.org/rpms/libvarlink.git /var/lib/mock/f45-build-17212-497/root/chroot_tmpdir/scmroot/libvarlink
Cloning into '/var/lib/mock/f45-build-17212-497/root/chroot_tmpdir/scmroot/libvarlink'...
$ git fetch origin 1c6ba498075f366c343afc545454cd65b3db9e73:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libvarlink
 * [new ref]         1c6ba498075f366c343afc545454cd65b3db9e73 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1c6ba49 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild