$ git clone -n https://src.fedoraproject.org/rpms/rust-x509-parser.git /var/lib/mock/f42-build-3252934-41225/root/chroot_tmpdir/scmroot/rust-x509-parser
Cloning into '/var/lib/mock/f42-build-3252934-41225/root/chroot_tmpdir/scmroot/rust-x509-parser'...
$ git fetch origin 954baa90402373b4586bd349ff7644a5e34a0f80:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-x509-parser
 * [new ref]         954baa90402373b4586bd349ff7644a5e34a0f80 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 954baa9 Initial import; Fixes: RHBZ#2313237