groups: fixes to pass GNU's Testsuite

src/uu/groups/src/groups.rs

@@ -5,6 +5,13 @@
 //
 // For the full copyright and license information, please view the LICENSE
 // file that was distributed with this source code.
+//
+// ============================================================================
+// Test suite summary for GNU coreutils 8.32.162-4eda
+// ============================================================================
+// PASS: tests/misc/groups-dash.sh
+// PASS: tests/misc/groups-process-all.sh
+// PASS: tests/misc/groups-version.sh
 
 // spell-checker:ignore (ToDO) passwd
 
@@ -14,11 +21,15 @@ use uucore::entries::{get_groups_gnu, gid2grp, Locate, Passwd};
 
 use clap::{crate_version, App, Arg};
 
-static ABOUT: &str = "display current group names";
-static OPT_USER: &str = "user";
+mod options {
+    pub const USERS: &str = "USERNAME";
+}
+static ABOUT: &str = "Print group memberships for each USERNAME or, \
+                      if no USERNAME is specified, for\nthe current process \
+                      (which may differ if the groups data‐base has changed).";
 
 fn get_usage() -> String {
-    format!("{0} [USERNAME]", executable!())
+    format!("{0} [OPTION]... [USERNAME]...", executable!())
 }
 
 pub fn uumain(args: impl uucore::Args) -> i32 {
@@ -28,36 +39,57 @@ pub fn uumain(args: impl uucore::Args) -> i32 {
         .version(crate_version!())
         .about(ABOUT)
         .usage(&usage[..])
-        .arg(Arg::with_name(OPT_USER))
+        .arg(
+            Arg::with_name(options::USERS)
+                .multiple(true)
+                .takes_value(true)
+                .value_name(options::USERS),
+        )
         .get_matches_from(args);
 
-    match matches.value_of(OPT_USER) {
-        None => {
+    let users: Vec<String> = matches
+        .values_of(options::USERS)
+        .map(|v| v.map(ToString::to_string).collect())
+        .unwrap_or_default();
+
+    let mut exit_code = 0;
+
+    if users.is_empty() {
+        println!(
+            "{}",
+            get_groups_gnu(None)
+                .unwrap()
+                .iter()
+                .map(|&gid| gid2grp(gid).unwrap_or_else(|_| {
+                    show_error!("cannot find name for group ID {}", gid);
+                    exit_code = 1;
+                    gid.to_string()
+                }))
+                .collect::<Vec<_>>()
+                .join(" ")
+        );
+        return exit_code;
+    }
+
+    for user in users {
+        if let Ok(p) = Passwd::locate(user.as_str()) {
             println!(
-                "{}",
-                get_groups_gnu(None)
-                    .unwrap()
+                "{} : {}",
+                user,
+                p.belongs_to()
                     .iter()
-                    .map(|&g| gid2grp(g).unwrap())
+                    .map(|&gid| gid2grp(gid).unwrap_or_else(|_| {
+                        show_error!("cannot find name for group ID {}", gid);
+                        exit_code = 1;
+                        gid.to_string()
+                    }))
                     .collect::<Vec<_>>()
                     .join(" ")
             );
-            0
-        }
-        Some(user) => {
-            if let Ok(p) = Passwd::locate(user) {
-                println!(
-                    "{}",
-                    p.belongs_to()
-                        .iter()
-                        .map(|&g| gid2grp(g).unwrap())
-                        .collect::<Vec<_>>()
-                        .join(" ")
-                );
-                0
-            } else {
-                crash!(1, "unknown user {}", user);
-            }
+        } else {
+            show_error!("'{}': no such user", user);
+            exit_code = 1;
         }
     }
+    exit_code
 }

tests/by-util/test_groups.rs

@@ -1,56 +1,176 @@
 use crate::common::util::*;
 
+// spell-checker:ignore (ToDO) coreutil
+
+// These tests run the GNU coreutils `(g)groups` binary in `$PATH` in order to gather reference values.
+// If the `(g)groups` in `$PATH` doesn't include a coreutils version string,
+// or the version is too low, the test is skipped.
+
+// The reference version is 8.32. Here 8.30 was chosen because right now there's no
+// ubuntu image for github action available with a higher version than 8.30.
+const VERSION_MIN: &str = "8.30"; // minimum Version for the reference `groups` in $PATH
+const VERSION_MIN_MULTIPLE_USERS: &str = "8.31"; // this feature was introduced in GNU's coreutils 8.31
+const UUTILS_WARNING: &str = "uutils-tests-warning";
+const UUTILS_INFO: &str = "uutils-tests-info";
+
+macro_rules! unwrap_or_return {
+    ( $e:expr ) => {
+        match $e {
+            Ok(x) => x,
+            Err(e) => {
+                println!("{}: test skipped: {}", UUTILS_INFO, e);
+                return;
+            }
+        }
+    };
+}
+
+fn whoami() -> String {
+    // Apparently some CI environments have configuration issues, e.g. with 'whoami' and 'id'.
+    //
+    // From the Logs: "Build (ubuntu-18.04, x86_64-unknown-linux-gnu, feat_os_unix, use-cross)"
+    //    whoami: cannot find name for user ID 1001
+    // id --name: cannot find name for user ID 1001
+    // id --name: cannot find name for group ID 116
+    //
+    // However, when running "id" from within "/bin/bash" it looks fine:
+    // id: "uid=1001(runner) gid=118(docker) groups=118(docker),4(adm),101(systemd-journal)"
+    // whoami: "runner"
+
+    // Use environment variable to get current user instead of
+    // invoking `whoami` and fall back to user "nobody" on error.
+    std::env::var("USER").unwrap_or_else(|e| {
+        println!("{}: {}, using \"nobody\" instead", UUTILS_WARNING, e);
+        "nobody".to_string()
+    })
+}
+
 #[test]
 #[cfg(unix)]
 fn test_groups() {
-    if !is_ci() {
-        new_ucmd!().succeeds().stdout_is(expected_result(&[]));
-    } else {
-        // TODO: investigate how this could be tested in CI
-        // stderr = groups: cannot find name for group ID 116
-        println!("test skipped:");
-    }
+    let result = new_ucmd!().run();
+    let exp_result = unwrap_or_return!(expected_result(&[]));
+
+    result
+        .stdout_is(exp_result.stdout_str())
+        .stderr_is(exp_result.stderr_str())
+        .code_is(exp_result.code());
 }
 
 #[test]
 #[cfg(unix)]
-#[ignore = "fixme: 'groups USERNAME' needs more debugging"]
 fn test_groups_username() {
-    let scene = TestScenario::new(util_name!());
-    let whoami_result = scene.cmd("whoami").run();
+    let test_users = [&whoami()[..]];
 
-    let username = if whoami_result.succeeded() {
-        whoami_result.stdout_move_str()
-    } else if is_ci() {
-        String::from("docker")
-    } else {
-        println!("test skipped:");
+    let result = new_ucmd!().args(&test_users).run();
+    let exp_result = unwrap_or_return!(expected_result(&test_users));
+
+    result
+        .stdout_is(exp_result.stdout_str())
+        .stderr_is(exp_result.stderr_str())
+        .code_is(exp_result.code());
+}
+
+#[test]
+#[cfg(unix)]
+fn test_groups_username_multiple() {
+    // TODO: [2021-06; jhscheer] refactor this as `let util_name = host_name_for(util_name!())` when that function is added to 'tests/common'
+    #[cfg(target_os = "linux")]
+    let util_name = util_name!();
+    #[cfg(all(unix, not(target_os = "linux")))]
+    let util_name = &format!("g{}", util_name!());
+    let version_check_string = check_coreutil_version(util_name, VERSION_MIN_MULTIPLE_USERS);
+    if version_check_string.starts_with(UUTILS_WARNING) {
+        println!("{}\ntest skipped", version_check_string);
         return;
-    };
+    }
+    let test_users = ["root", "man", "postfix", "sshd", &whoami()];
+
+    let result = new_ucmd!().args(&test_users).run();
+    let exp_result = unwrap_or_return!(expected_result(&test_users));
 
-    // TODO: stdout should be in the form: "username : group1 group2 group3"
+    result
+        .stdout_is(exp_result.stdout_str())
+        .stderr_is(exp_result.stderr_str())
+        .code_is(exp_result.code());
+}
 
-    scene
-        .ucmd()
-        .arg(&username)
-        .succeeds()
-        .stdout_is(expected_result(&[&username]));
+fn check_coreutil_version(util_name: &str, version_expected: &str) -> String {
+    // example:
+    // $ id --version | head -n 1
+    // id (GNU coreutils) 8.32.162-4eda
+    let scene = TestScenario::new(util_name);
+    let version_check = scene
+        .cmd_keepenv(&util_name)
+        .env("LC_ALL", "C")
+        .arg("--version")
+        .run();
+    version_check
+        .stdout_str()
+        .split('\n')
+        .collect::<Vec<_>>()
+        .get(0)
+        .map_or_else(
+            || format!("{}: unexpected output format for reference coreutil: '{} --version'", UUTILS_WARNING, util_name),
+            |s| {
+                if s.contains(&format!("(GNU coreutils) {}", version_expected)) {
+                    s.to_string()
+                } else if s.contains("(GNU coreutils)") {
+                    let version_found = s.split_whitespace().last().unwrap()[..4].parse::<f32>().unwrap_or_default();
+                    let version_expected = version_expected.parse::<f32>().unwrap_or_default();
+                    if version_found > version_expected {
+                    format!("{}: version for the reference coreutil '{}' is higher than expected; expected: {}, found: {}", UUTILS_INFO, util_name, version_expected, version_found)
+                    } else {
+                    format!("{}: version for the reference coreutil '{}' does not match; expected: {}, found: {}", UUTILS_WARNING, util_name, version_expected, version_found) }
+                } else {
+                    format!("{}: no coreutils version string found for reference coreutils '{} --version'", UUTILS_WARNING, util_name)
+                }
+            },
+        )
 }
 
+#[allow(clippy::needless_borrow)]
 #[cfg(unix)]
-fn expected_result(args: &[&str]) -> String {
-    // We want to use GNU id. On most linux systems, this is "id", but on
-    // bsd-like systems (e.g. FreeBSD, MacOS), it is commonly "gid".
-    #[cfg(any(target_os = "linux"))]
-    let util_name = "id";
-    #[cfg(not(target_os = "linux"))]
-    let util_name = "gid";
-
-    TestScenario::new(util_name)
+fn expected_result(args: &[&str]) -> Result<CmdResult, String> {
+    // TODO: [2021-06; jhscheer] refactor this as `let util_name = host_name_for(util_name!())` when that function is added to 'tests/common'
+    #[cfg(target_os = "linux")]
+    let util_name = util_name!();
+    #[cfg(all(unix, not(target_os = "linux")))]
+    let util_name = &format!("g{}", util_name!());
+
+    let version_check_string = check_coreutil_version(util_name, VERSION_MIN);
+    if version_check_string.starts_with(UUTILS_WARNING) {
+        return Err(version_check_string);
+    }
+    println!("{}", version_check_string);
+
+    let scene = TestScenario::new(util_name);
+    let result = scene
         .cmd_keepenv(util_name)
-        .env("LANGUAGE", "C")
+        .env("LC_ALL", "C")
         .args(args)
-        .args(&["-Gn"])
-        .succeeds()
-        .stdout_move_str()
+        .run();
+
+    let (stdout, stderr): (String, String) = if cfg!(target_os = "linux") {
+        (
+            result.stdout_str().to_string(),
+            result.stderr_str().to_string(),
+        )
+    } else {
+        // strip 'g' prefix from results:
+        let from = util_name.to_string() + ":";
+        let to = &from[1..];
+        (
+            result.stdout_str().replace(&from, to),
+            result.stderr_str().replace(&from, to),
+        )
+    };
+
+    Ok(CmdResult::new(
+        Some(result.tmpd()),
+        Some(result.code()),
+        result.succeeded(),
+        stdout.as_bytes(),
+        stderr.as_bytes(),
+    ))
 }