$ git clone -n https://src.fedoraproject.org/rpms/rust-glycin-external.git /var/lib/mock/f45-build-45130-821/root/chroot_tmpdir/scmroot/rust-glycin-external
Cloning into '/var/lib/mock/f45-build-45130-821/root/chroot_tmpdir/scmroot/rust-glycin-external'...
$ git fetch origin 3849f6dc977c307ac6f3a55df199465366bb9d34:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-glycin-external
 * [new ref]         3849f6dc977c307ac6f3a55df199465366bb9d34 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3849f6d Update to version 4.0.2; Fixes RHBZ#2546692