Make hardware test execution control more granular

When /dev/sev does not exist:

Autodetection:

    $ cargo test
    [..]
    test get_identifer ... ignored
    test pdh_generate ... ignored
    test pek_csr ... ignored
    test pek_generate ... ignored
    test platform_reset ... ignored
    test platform_status ... ignored
    [..]

Override:

    $ cargo test --features=hw_tests
    [..]
    test pdh_generate ... ignored
    test pek_generate ... ignored
    test platform_reset ... ignored
    test pek_csr ... FAILED
    test get_identifer ... FAILED
    test platform_status ... FAILED
    [..]

With dangerous tests:

    $ cargo test --features=dangerous_hw_tests
    [..]
    test get_identifer ... FAILED
    test pek_csr ... FAILED
    test platform_status ... FAILED
    test pdh_generate ... FAILED
    test pek_generate ... FAILED
    test platform_reset ... FAILED
    [..]

When /dev/sev DOES exist:

    $ cargo test
    [..]
    test pdh_generate ... ignored
    test pek_generate ... ignored
    test platform_reset ... ignored
    test get_identifer ... ok
    test pek_csr ... ok
    test platform_status ... ok
    [..]

Override:

    $ cargo test --features=hw_tests
    [..]
    test pdh_generate ... ignored
    test pek_generate ... ignored
    test platform_reset ... ignored
    test get_identifer ... ok
    test pek_csr ... ok
    test platform_status ... ok
    [..]

With dangerous tests:

    $ cargo test --features=dangerous_hw_tests
    [..]
    test get_identifer ... ok
    test platform_status ... ok
    test pek_csr ... ok
    test pdh_generate ... ok
    test platform_reset ... ok
    test pek_generate ... ok
    [..]

Signed-off-by: Connor Kuehl <[email protected]>

Author: Connor Kuehl

Cargo.toml

@@ -22,7 +22,8 @@ is-it-maintained-open-issues = { repository = "enarx/sev" }
 
 [features]
 default = []
-dangerous_hw_tests = []
+hw_tests = []
+dangerous_hw_tests = ["hw_tests"]
 
 [dependencies]
 openssl = { version = "0.10", optional = true }

build.rs

@@ -3,7 +3,7 @@
 fn main() {
     use std::path::Path;
 
-    if Path::new("/dev/sev").exists() {
+    if cfg!(feature = "hw_tests") || Path::new("/dev/sev").exists() {
         println!("cargo:rustc-cfg=has_sev");
     }
 }