$ git clone -n https://src.fedoraproject.org/rpms/ghc-filepattern.git /var/lib/mock/f40-build-2095163-50372/root/chroot_tmpdir/scmroot/ghc-filepattern
Cloning into '/var/lib/mock/f40-build-2095163-50372/root/chroot_tmpdir/scmroot/ghc-filepattern'...
$ git fetch origin 164388d8b0812f659e990b68d3c0414f9d97fea2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-filepattern
 * [new ref]         164388d8b0812f659e990b68d3c0414f9d97fea2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 164388d bump release