[PATCH v1 bpf-next 1/9] bpftool: add testing skeleton

[Manu Bretelle <chantr4@gmail.com>]

Add minimal cargo project to test bpftool.
An environment variable `BPFTOOL_PATH` can be used to provide the path
to bpftool, defaulting to /usr/sbin/bpftool

    $ cargo check --tests
        Finished dev [unoptimized + debuginfo] target(s) in 0.00s
    $ cargo clippy --tests
        Finished dev [unoptimized + debuginfo] target(s) in 0.05s
    $ BPFTOOL_PATH='../bpftool' cargo test -- --nocapture
        Finished test [unoptimized + debuginfo] target(s) in 0.05s
         Running unittests src/main.rs
    (target/debug/deps/bpftool_tests-172b867215e9364e)

    running 1 test
    Running command "../bpftool" "version"
    test bpftool_tests::run_bpftool ... ok

    test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered
    out; finished in 0.00s

Signed-off-by: Manu Bretelle <chantr4@gmail.com>
---
 .../selftests/bpf/bpftool_tests/.gitignore    |  3 +++
 .../selftests/bpf/bpftool_tests/Cargo.toml    |  4 ++++
 .../bpf/bpftool_tests/src/bpftool_tests.rs    | 20 +++++++++++++++++++
 .../selftests/bpf/bpftool_tests/src/main.rs   |  3 +++
 4 files changed, 30 insertions(+)
 create mode 100644 tools/testing/selftests/bpf/bpftool_tests/.gitignore
 create mode 100644 tools/testing/selftests/bpf/bpftool_tests/Cargo.toml
 create mode 100644 tools/testing/selftests/bpf/bpftool_tests/src/bpftool_tests.rs
 create mode 100644 tools/testing/selftests/bpf/bpftool_tests/src/main.rs

diff --git a/tools/testing/selftests/bpf/bpftool_tests/.gitignore b/tools/testing/selftests/bpf/bpftool_tests/.gitignore
new file mode 100644
index 000000000000..cf8177c6aabd
--- /dev/null
+++ b/tools/testing/selftests/bpf/bpftool_tests/.gitignore
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+/target/**
+/Cargo.lock
diff --git a/tools/testing/selftests/bpf/bpftool_tests/Cargo.toml b/tools/testing/selftests/bpf/bpftool_tests/Cargo.toml
new file mode 100644
index 000000000000..34df3002003f
--- /dev/null
+++ b/tools/testing/selftests/bpf/bpftool_tests/Cargo.toml
@@ -0,0 +1,4 @@
+[package]
+name = "bpftool_tests"
+version = "0.1.0"
+edition = "2021"
diff --git a/tools/testing/selftests/bpf/bpftool_tests/src/bpftool_tests.rs b/tools/testing/selftests/bpf/bpftool_tests/src/bpftool_tests.rs
new file mode 100644
index 000000000000..251dbf3861fe
--- /dev/null
+++ b/tools/testing/selftests/bpf/bpftool_tests/src/bpftool_tests.rs
@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+use std::process::Command;
+
+const BPFTOOL_PATH_ENV: &str = "BPFTOOL_PATH";
+const BPFTOOL_PATH: &str = "/usr/sbin/bpftool";
+
+/// Run a bpftool command and returns the output
+fn run_bpftool_command(args: &[&str]) -> std::process::Output {
+    let mut cmd = Command::new(std::env::var(BPFTOOL_PATH_ENV).unwrap_or(BPFTOOL_PATH.to_string()));
+    cmd.args(args);
+    println!("Running command {:?}", cmd);
+    cmd.output().expect("failed to execute process")
+}
+
+/// Simple test to make sure we can run bpftool
+#[test]
+fn run_bpftool() {
+    let output = run_bpftool_command(&["version"]);
+    assert!(output.status.success());
+}
diff --git a/tools/testing/selftests/bpf/bpftool_tests/src/main.rs b/tools/testing/selftests/bpf/bpftool_tests/src/main.rs
new file mode 100644
index 000000000000..6b4ffcde7406
--- /dev/null
+++ b/tools/testing/selftests/bpf/bpftool_tests/src/main.rs
@@ -0,0 +1,3 @@
+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+#[cfg(test)]
+mod bpftool_tests;
-- 
2.39.3