The system's libc_type attribute is now populated on alpine con… (sen…

…su#3682)

Signed-off-by: Simon Plourde <[email protected]>

CHANGELOG.md

@@ -13,6 +13,7 @@ Versioning](http://semver.org/spec/v2.0.0.html).
 and sensu-agent start.
 - Keepalives can now be published via the HTTP API.
 - Token substitution templates can now express escape-quoted strings.
+- The system's libc_type attribute is now populated on alpine containers.
 
 ## [5.19.0] - 2020-03-26
 

system/system.go

@@ -81,7 +81,10 @@ func Info() (types.System, error) {
 
 func getLibCType() (string, error) {
 	output, err := exec.Command("ldd", "--version").CombinedOutput()
-	if err != nil {
+	// The command above will return an exit code of 1 on alpine, but still output
+	// the relevant information. Therefore, as a workaround, we can inspect stderr
+	// and ignore the error if it contains pertinent data about the C library
+	if err != nil && !strings.Contains(strings.ToLower(string(output)), "libc") {
 		return "", err
 	}
 	text := strings.ToLower(string(output))