$ git clone -n https://src.fedoraproject.org/rpms/rust-proptest.git /var/lib/mock/f41-build-side-1-3137292-39792/root/chroot_tmpdir/scmroot/rust-proptest
Cloning into '/var/lib/mock/f41-build-side-1-3137292-39792/root/chroot_tmpdir/scmroot/rust-proptest'...
$ git fetch origin cecb974b5eb754a8f9dae8b7524905be944c0019:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-proptest
 * [new ref]         cecb974b5eb754a8f9dae8b7524905be944c0019 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cecb974 Update to version 1.5.0; Fixes RHBZ#2293795