$ git clone -n https://src.fedoraproject.org/rpms/ghc-simple-cmd-args.git /var/lib/mock/f41-build-side-1-2955659-35550/root/chroot_tmpdir/scmroot/ghc-simple-cmd-args
Cloning into '/var/lib/mock/f41-build-side-1-2955659-35550/root/chroot_tmpdir/scmroot/ghc-simple-cmd-args'...
$ git fetch origin 012587efad3312fcbff11aad3886047ac8aec01c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-simple-cmd-args
 * [new ref]         012587efad3312fcbff11aad3886047ac8aec01c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 012587e bump release