$ git clone -n https://src.fedoraproject.org/rpms/rust-difftastic.git /var/lib/mock/f40-build-2072200-49334/root/chroot_tmpdir/scmroot/rust-difftastic
Cloning into '/var/lib/mock/f40-build-2072200-49334/root/chroot_tmpdir/scmroot/rust-difftastic'...
$ git fetch origin d28800cec84d0859cc10abc47e264856ca81ae65:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-difftastic
 * [new ref]         d28800cec84d0859cc10abc47e264856ca81ae65 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d28800c Update to 0.53.1