$ git clone -n https://src.fedoraproject.org/rpms/rust2rpm.git /var/lib/mock/f40-build-2710275-71701/root/chroot_tmpdir/scmroot/rust2rpm
Cloning into '/var/lib/mock/f40-build-2710275-71701/root/chroot_tmpdir/scmroot/rust2rpm'...
$ git fetch origin bea2d18bcb041659de8e8f854784ce86070ac6a4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust2rpm
 * [new ref]         bea2d18bcb041659de8e8f854784ce86070ac6a4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bea2d18 Update to version 26.1.0; Fixes RHBZ#2274732