$ git clone -n https://src.fedoraproject.org/rpms/rust-imara-diff.git /var/lib/mock/f38-build-side-43-rust-devel-1420423-31461/root/chroot_tmpdir/scmroot/rust-imara-diff
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1420423-31461/root/chroot_tmpdir/scmroot/rust-imara-diff'...
$ git fetch origin 4966fa0b8932d304758c0e1430a54abe85f4d535:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-imara-diff
 * [new ref]         4966fa0b8932d304758c0e1430a54abe85f4d535 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4966fa0 Initial package (rhbz#2238616)