kata-ctl: Limit running tests to x86 and use native-tls on s390x

For s390x, use native-tls for reqwest because the rustls-tls/ring
dependency is not available for s390x.

Also exclude s390x, powerpc64le, and aarch64 from running the cpu
check due to the lack of the arch-specific implementation. In this
case, rust complains about unused functions in src/check.rs (both
normal and test context).

Fixes: #5438

Co-authored-by: James O. D. Hunt <james.o.hunt@intel.com>
Signed-off-by: Hendrik Brueckner <brueckner@linux.ibm.com>

src/tools/kata-ctl/Cargo.toml

@@ -3,6 +3,9 @@
 # SPDX-License-Identifier: Apache-2.0
 #
 
+[workspace]
+resolver = "2"
+
 [package]
 name = "kata-ctl"
 version = "0.0.1"
@@ -12,9 +15,14 @@ edition = "2018"
 [dependencies]
 anyhow = "1.0.31"
 clap = { version = "3.2.20", features = ["derive", "cargo"] }
-reqwest = { version = "0.11", default-features = false, features = ["json", "blocking", "rustls-tls"] }
 serde_json = "1.0.85"
 thiserror = "1.0.35"
 
+[target.'cfg(target_arch = "s390x")'.dependencies]
+reqwest = { version = "0.11", default-features = false, features = ["json", "blocking", "native-tls"] }
+
+[target.'cfg(not(target_arch = "s390x"))'.dependencies]
+reqwest = { version = "0.11", default-features = false, features = ["json", "blocking", "rustls-tls"] }
+
 [dev-dependencies]
 semver = "1.0.12"

src/tools/kata-ctl/src/check.rs

@@ -9,18 +9,19 @@ use anyhow::{anyhow, Result};
 use reqwest::header::{CONTENT_TYPE, USER_AGENT};
 use serde_json::Value;
 use std::collections::HashMap;
-use std::fs;
 
 const KATA_GITHUB_URL: &str =
     "https://api.github.com/repos/kata-containers/kata-containers/releases/latest";
 
+#[cfg(any(target_arch = "x86_64"))]
 fn get_cpu_info(cpu_info_file: &str) -> Result<String> {
-    let contents = fs::read_to_string(cpu_info_file)?;
+    let contents = std::fs::read_to_string(cpu_info_file)?;
     Ok(contents)
 }
 
 // get_single_cpu_info returns the contents of the first cpu from
 // the specified cpuinfo file by parsing based on a specified delimiter
+#[cfg(any(target_arch = "x86_64"))]
 pub fn get_single_cpu_info(cpu_info_file: &str, substring: &str) -> Result<String> {
     let contents = get_cpu_info(cpu_info_file)?;
 
@@ -40,6 +41,7 @@ pub fn get_single_cpu_info(cpu_info_file: &str, substring: &str) -> Result<Strin
 
 // get_cpu_flags returns a string of cpu flags from cpuinfo, passed in
 // as a string
+#[cfg(any(target_arch = "x86_64"))]
 pub fn get_cpu_flags(cpu_info: &str, cpu_flags_tag: &str) -> Result<String> {
     if cpu_info.is_empty() {
         return Err(anyhow!("cpu_info string is empty"))?;
@@ -63,6 +65,7 @@ pub fn get_cpu_flags(cpu_info: &str, cpu_flags_tag: &str) -> Result<String> {
 
 // get_missing_strings searches for required (strings) in data and returns
 // a vector containing the missing strings
+#[cfg(any(target_arch = "x86_64"))]
 fn get_missing_strings(data: &str, required: &'static [&'static str]) -> Result<Vec<String>> {
     let mut missing: Vec<String> = Vec::new();
 
@@ -75,6 +78,7 @@ fn get_missing_strings(data: &str, required: &'static [&'static str]) -> Result<
     Ok(missing)
 }
 
+#[cfg(any(target_arch = "x86_64"))]
 pub fn check_cpu_flags(
     retrieved_flags: &str,
     required_flags: &'static [&'static str],
@@ -84,6 +88,7 @@ pub fn check_cpu_flags(
     Ok(missing_flags)
 }
 
+#[cfg(any(target_arch = "x86_64"))]
 pub fn check_cpu_attribs(
     cpu_info: &str,
     required_attribs: &'static [&'static str],
@@ -139,6 +144,7 @@ pub fn check_version() -> Result<()> {
     Ok(())
 }
 
+#[cfg(any(target_arch = "x86_64"))]
 #[cfg(test)]
 mod tests {
     use super::*;