$ git clone -n https://src.fedoraproject.org/rpms/rust-rancor.git /var/lib/mock/f45-build-44216-811/root/chroot_tmpdir/scmroot/rust-rancor
Cloning into '/var/lib/mock/f45-build-44216-811/root/chroot_tmpdir/scmroot/rust-rancor'...
$ git fetch origin f72e5aedebad3e433f3a89443f8d729c7f887270:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rancor
 * [new ref]         f72e5aedebad3e433f3a89443f8d729c7f887270 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f72e5ae Update to version 0.1.3; Fixes RHBZ#2511537