$ git clone -n https://src.fedoraproject.org/rpms/rust-chrono-tz-build.git /var/lib/mock/f39-build-1509982-35464/root/chroot_tmpdir/scmroot/rust-chrono-tz-build
Cloning into '/var/lib/mock/f39-build-1509982-35464/root/chroot_tmpdir/scmroot/rust-chrono-tz-build'...
$ git fetch origin 3fe8e8b08a7902013e29dd6290c4dd6e32dc4287:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-chrono-tz-build
 * [new ref]         3fe8e8b08a7902013e29dd6290c4dd6e32dc4287 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3fe8e8b Initial import (#2236618)