user: *: fix function signatures

This patch changes the incorrectly named functions GetPasswdFile,
GetGroupFile, GetExecUserFile and several internal components to
GetPasswdPath, GetGroupPath, etc -- as these are far more appropriate
names and more clearly convey to users what the arguments represent.

Signed-off-by: Aleksa Sarai <cyphar@cyphar.com> (github: cyphar)

user/lookup_unix.go

@@ -9,22 +9,22 @@ import (
 
 // Unix-specific path to the passwd and group formatted files.
 const (
-	unixPasswdFile = "/etc/passwd"
-	unixGroupFile  = "/etc/group"
+	unixPasswdPath = "/etc/passwd"
+	unixGroupPath  = "/etc/group"
 )
 
-func GetPasswdFile() (string, error) {
-	return unixPasswdFile, nil
+func GetPasswdPath() (string, error) {
+	return unixPasswdPath, nil
 }
 
 func GetPasswd() (io.ReadCloser, error) {
-	return os.Open(unixPasswdFile)
+	return os.Open(unixPasswdPath)
 }
 
-func GetGroupFile() (string, error) {
-	return unixGroupFile, nil
+func GetGroupPath() (string, error) {
+	return unixGroupPath, nil
 }
 
 func GetGroup() (io.ReadCloser, error) {
-	return os.Open(unixGroupFile)
+	return os.Open(unixGroupPath)
 }

user/lookup_unsupported.go

@@ -4,15 +4,15 @@ package user
 
 import "io"
 
-func GetPasswdFile() (string, error) {
+func GetPasswdPath() (string, error) {
 	return "", ErrUnsupported
 }
 
 func GetPasswd() (io.ReadCloser, error) {
 	return nil, ErrUnsupported
 }
 
-func GetGroupFile() (string, error) {
+func GetGroupPath() (string, error) {
 	return "", ErrUnsupported
 }
 

user/user.go

@@ -197,11 +197,11 @@ type ExecUser struct {
 	Home     string
 }
 
-// GetExecUserFile is a wrapper for GetExecUser. It reads data from each of the
+// GetExecUserPath is a wrapper for GetExecUser. It reads data from each of the
 // given file paths and uses that data as the arguments to GetExecUser. If the
 // files cannot be opened for any reason, the error is ignored and a nil
 // io.Reader is passed instead.
-func GetExecUserFile(userSpec string, defaults *ExecUser, passwdPath, groupPath string) (*ExecUser, error) {
+func GetExecUserPath(userSpec string, defaults *ExecUser, passwdPath, groupPath string) (*ExecUser, error) {
 	passwd, err := os.Open(passwdPath)
 	if err != nil {
 		passwd = nil