$ git clone -n https://src.fedoraproject.org/rpms/golang-github-google-gopacket.git /var/lib/mock/f40-build-2356277-60307/root/chroot_tmpdir/scmroot/golang-github-google-gopacket
Cloning into '/var/lib/mock/f40-build-2356277-60307/root/chroot_tmpdir/scmroot/golang-github-google-gopacket'...
$ git fetch origin f400ef9674f3059f4656222e3d2e7d3910470d62:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-google-gopacket
 * [new ref]         f400ef9674f3059f4656222e3d2e7d3910470d62 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f400ef9 Don't run TestBPFInstruction on releases with too-new libpcap