$ git clone -n https://src.fedoraproject.org/rpms/rust-iana-time-zone.git /var/lib/mock/f42-build-side-1-3586768-46925/root/chroot_tmpdir/scmroot/rust-iana-time-zone
Cloning into '/var/lib/mock/f42-build-side-1-3586768-46925/root/chroot_tmpdir/scmroot/rust-iana-time-zone'...
$ git fetch origin 4039c3520198d5e4f3545d342bf529465ff720cb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-iana-time-zone
 * [new ref]         4039c3520198d5e4f3545d342bf529465ff720cb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4039c35 Update to version 0.1.63; Fixes RHBZ#2354477