$ git clone -n https://src.fedoraproject.org/rpms/rust-rust-ini.git /var/lib/mock/f42-build-side-1-3581446-46829/root/chroot_tmpdir/scmroot/rust-rust-ini
Cloning into '/var/lib/mock/f42-build-side-1-3581446-46829/root/chroot_tmpdir/scmroot/rust-rust-ini'...
$ git fetch origin c3ca891749729236518807e54c975fd4e538cba7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rust-ini
 * [new ref]         c3ca891749729236518807e54c975fd4e538cba7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c3ca891 Update to version 0.21.1; Fixes RHBZ#2193253