$ git clone -n https://src.fedoraproject.org/rpms/rust-micro-timer.git /var/lib/mock/f39-build-1493966-34542/root/chroot_tmpdir/scmroot/rust-micro-timer
Cloning into '/var/lib/mock/f39-build-1493966-34542/root/chroot_tmpdir/scmroot/rust-micro-timer'...
$ git fetch origin 9063cff8e58f84676ba7710b59e12b9630f513c2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-micro-timer
 * [new ref]         9063cff8e58f84676ba7710b59e12b9630f513c2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9063cff Regenerate with rust2rpm v24