$ git clone -n https://src.fedoraproject.org/rpms/rust-jiff.git /var/lib/mock/f42-build-side-1-3540398-46574/root/chroot_tmpdir/scmroot/rust-jiff
Cloning into '/var/lib/mock/f42-build-side-1-3540398-46574/root/chroot_tmpdir/scmroot/rust-jiff'...
$ git fetch origin 8024ab95acd4877f32762b6a6b43753b05b554bc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-jiff
 * [new ref]         8024ab95acd4877f32762b6a6b43753b05b554bc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8024ab9 Update to version 0.2.15; Fixes RHBZ#2372783