$ git clone -n https://src.fedoraproject.org/rpms/rust-imara-diff.git /var/lib/mock/f42-build-3231210-41191/root/chroot_tmpdir/scmroot/rust-imara-diff
Cloning into '/var/lib/mock/f42-build-3231210-41191/root/chroot_tmpdir/scmroot/rust-imara-diff'...
$ git fetch origin cd3784ec9485758c06beaa233435697f48a63b7f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-imara-diff
 * [new ref]         cd3784ec9485758c06beaa233435697f48a63b7f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cd3784e Update version to 0.1.8 (rhbz#2343381)