$ git clone -n https://src.fedoraproject.org/rpms/rust-onig_sys.git /var/lib/mock/f45-build-43529-803/root/chroot_tmpdir/scmroot/rust-onig_sys
Cloning into '/var/lib/mock/f45-build-43529-803/root/chroot_tmpdir/scmroot/rust-onig_sys'...
$ git fetch origin aeb092d2c6bcf46b203d0b64bd822e6aadc5f407:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-onig_sys
 * [new ref]         aeb092d2c6bcf46b203d0b64bd822e6aadc5f407 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at aeb092d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild