$ git clone -n https://src.fedoraproject.org/rpms/glycin-loaders.git /var/lib/mock/f39-build-1771187-41502/root/chroot_tmpdir/scmroot/glycin-loaders
Cloning into '/var/lib/mock/f39-build-1771187-41502/root/chroot_tmpdir/scmroot/glycin-loaders'...
$ git fetch origin 34b8d16859cfd172543dce7c6de4f4d8dc54af0f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/glycin-loaders
 * [new ref]         34b8d16859cfd172543dce7c6de4f4d8dc54af0f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 34b8d16 Update to 0.1.2