genrule(
    name = "gen_foo_proto",
    outs = ["foo_generated.proto"],
    cmd = """echo 'syntax = "proto2"' > foo_generated.proto""",
)

genrule(
    name = "gen_bar_txt",
    outs = ["bar_generated.txt"],
    cmd = "echo 12345 > bar_generated.txt",
)