$ git clone -n https://src.fedoraproject.org/rpms/libnss-mysql.git /var/lib/mock/f40-build-762014-121822/root/chroot_tmpdir/scmroot/libnss-mysql
Cloning into '/var/lib/mock/f40-build-762014-121822/root/chroot_tmpdir/scmroot/libnss-mysql'...
$ git fetch origin 4dfb492143cdb2ddada2e3cc819a254af54637bf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libnss-mysql
 * [new ref]         4dfb492143cdb2ddada2e3cc819a254af54637bf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4dfb492 Use mysql for initgroups nsswich.conf entry too