$ git clone -n https://src.fedoraproject.org/rpms/chromium.git /var/lib/mock/f41-build-820115-152083/root/chroot_tmpdir/scmroot/chromium
Cloning into '/var/lib/mock/f41-build-820115-152083/root/chroot_tmpdir/scmroot/chromium'...
$ git fetch origin dd3936a5fb3b275d13a4a28a6f069b327246205e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/chromium
 * [new ref]         dd3936a5fb3b275d13a4a28a6f069b327246205e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dd3936a fix error: undefined symbol: llvm::MCAsmInfoXCOFF::MCAsmInfoXCOFF()