$ git clone -n https://src.fedoraproject.org/rpms/rust-glycin-utils.git /var/lib/mock/f42-build-side-1-3503852-45982/root/chroot_tmpdir/scmroot/rust-glycin-utils
Cloning into '/var/lib/mock/f42-build-side-1-3503852-45982/root/chroot_tmpdir/scmroot/rust-glycin-utils'...
$ git fetch origin c6777f2ec54d506d74dfb6803618b5695ce3a05a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-glycin-utils
 * [new ref]         c6777f2ec54d506d74dfb6803618b5695ce3a05a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c6777f2 Update to version 3.0.0; Fixes RHBZ#2352572