Don't fail when getting posix user isn't possible

sdk/hs-opentelemetry-sdk.cabal

@@ -5,7 +5,7 @@ cabal-version: 1.22
 -- see: https://github.com/sol/hpack
 
 name:           hs-opentelemetry-sdk
-version:        0.0.2.1
+version:        0.0.2.2
 synopsis:       OpenTelemetry SDK for use in applications.
 description:    Please see the README on GitHub at <https://github.com/iand675/hs-opentelemetry/tree/main/sdk#readme>
 category:       OpenTelemetry, Telemetry, Monitoring, Observability, Metrics

sdk/package.yaml

@@ -1,7 +1,7 @@
 _common/lib: !include "../package-common.yaml"
 
 name:                hs-opentelemetry-sdk
-version:             0.0.2.1
+version:             0.0.2.2
 
 <<: *preface
 

sdk/src/OpenTelemetry/Resource/Process/Detector.hs

@@ -8,6 +8,8 @@ import System.Posix.User (getEffectiveUserName)
 import System.Info
 import Data.Version
 import OpenTelemetry.Resource.Process
+import Control.Exception (try, throwIO)
+import System.IO.Error
 
 -- | Create a 'Process' 'Resource' based off of the current process' knowledge
 -- of itself.
@@ -22,7 +24,16 @@ detectProcess = do
     pure Nothing <*>
     pure Nothing <*>
     (Just . map T.pack <$> getArgs) <*>
-    (Just . T.pack <$> getEffectiveUserName)
+    tryGetUser
+
+tryGetUser :: IO (Maybe T.Text)
+tryGetUser = do
+  eResult <- try getEffectiveUserName
+  case eResult of
+    Left err -> if isDoesNotExistError err
+      then pure Nothing
+      else throwIO err
+    Right ok -> pure $ Just $ T.pack ok
 
 -- | A 'ProcessRuntime' 'Resource' populated with the current process' knoweldge
 -- of itself.