$ git clone -n https://src.fedoraproject.org/rpms/python-grpc-google-iam-v1.git /var/lib/mock/f39-build-1759210-41485/root/chroot_tmpdir/scmroot/python-grpc-google-iam-v1
Cloning into '/var/lib/mock/f39-build-1759210-41485/root/chroot_tmpdir/scmroot/python-grpc-google-iam-v1'...
$ git fetch origin 7796a84283494cbbc36633633f90e5f72759eb07:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-grpc-google-iam-v1
 * [new ref]         7796a84283494cbbc36633633f90e5f72759eb07 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7796a84 Update to 0.12.7 rhbz#2248963