$ git clone -n https://src.fedoraproject.org/rpms/rust-glycin.git /var/lib/mock/f45-build-45118-821/root/chroot_tmpdir/scmroot/rust-glycin
Cloning into '/var/lib/mock/f45-build-45118-821/root/chroot_tmpdir/scmroot/rust-glycin'...
$ git fetch origin 9929dbc439f2927c96a4d04dbddba35a6a1d067e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-glycin
 * [new ref]         9929dbc439f2927c96a4d04dbddba35a6a1d067e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9929dbc Update to version 4.0.2; Fixes RHBZ#2546689