$ git clone -n https://src.fedoraproject.org/rpms/rust-test-log.git /var/lib/mock/f40-build-1620348-24099/root/chroot_tmpdir/scmroot/rust-test-log
Cloning into '/var/lib/mock/f40-build-1620348-24099/root/chroot_tmpdir/scmroot/rust-test-log'...
$ git fetch origin 56644243a21e5e1f3754f1aadb28ca1fd7bf8836:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-test-log
 * [new ref]         56644243a21e5e1f3754f1aadb28ca1fd7bf8836 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5664424 Update to version 0.2.16; Fixes RHBZ#2278008