Maint: do not mock os functions

- Use filepaths with /tmp for tests instead
- Only mock functions where filepath can't be specified such as user.Lookup

internal/configuration/settings.go

@@ -6,7 +6,6 @@ import (
 	"strings"
 
 	"github.com/qdm12/golibs/logging"
-	"github.com/qdm12/golibs/os"
 	"github.com/qdm12/golibs/params"
 )
 
@@ -62,8 +61,8 @@ var (
 
 // Read obtains all configuration options for the program and returns an error as soon
 // as an error is encountered reading them.
-func (settings *Settings) Read(env params.Env, os os.OS, logger logging.Logger) (err error) {
-	r := newReader(env, os, logger)
+func (settings *Settings) Read(env params.Env, logger logging.Logger) (err error) {
+	r := newReader(env, logger)
 
 	settings.VersionInformation, err = r.env.OnOff("VERSION_INFORMATION", params.Default("on"))
 	if err != nil {