Add uid, gid, and permissions to OverlayFile struct

There is an existing test for this. uid, gid, and permissions seem
consistent across test boxes.

CHANGELOG.md

@@ -10,6 +10,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 - Added override.conf for nm-wait-online-initrd.service with dracut.
 - Added userdocs for `wwctl node import` from yaml/csv.
+- Added uid, gid, and permissions to OverlayFile in REST API. #1925
 
 ### Fixed
 

internal/pkg/warewulfd/api/overlay.go

@@ -6,6 +6,7 @@ import (
 	"net/url"
 	"os"
 	"path"
+	"syscall"
 
 	"github.com/swaggest/usecase"
 	"github.com/swaggest/usecase/status"
@@ -68,9 +69,12 @@ func getOverlayByName() usecase.Interactor {
 }
 
 type OverlayFile struct {
-	Overlay  string `json:"overlay"`
-	Path     string `json:"path"`
-	Contents string `json:"contents"`
+	Overlay  string      `json:"overlay"`
+	Path     string      `json:"path"`
+	Contents string      `json:"contents"`
+	Perms    os.FileMode `json:"perms"`
+	Uid      uint32      `json:"uid"`
+	Gid      uint32      `json:"gid"`
 	rendered bool
 }
 
@@ -83,7 +87,23 @@ func (of *OverlayFile) Exists() bool {
 }
 
 func (of *OverlayFile) readContents() (string, error) {
-	f, err := os.ReadFile(of.FullPath())
+	fullPath := of.FullPath()
+	f, err := os.ReadFile(fullPath)
+	if err != nil {
+		wwlog.Warn("os.ReadFile err %w", err)
+		return "", err
+	}
+	// Populate the permissions, uid, and gid.
+	s, err := os.Stat(fullPath)
+	if err != nil {
+		wwlog.Warn("os.Stat err %w", err)
+		return "", err
+	}
+	fileMode := s.Mode()
+	of.Perms = fileMode & os.ModePerm
+	sys := s.Sys()
+	of.Uid = sys.(*syscall.Stat_t).Uid
+	of.Gid = sys.(*syscall.Stat_t).Gid
 	return string(f), err
 }
 

internal/pkg/warewulfd/api/overlay_test.go

@@ -1,6 +1,7 @@
 package api
 
 import (
+	"encoding/json"
 	"io"
 	"net"
 	"net/http"
@@ -74,7 +75,22 @@ func TestOverlayAPI(t *testing.T) {
 		assert.NoError(t, err)
 		assert.NoError(t, resp.Body.Close())
 
-		assert.JSONEq(t, `{"overlay":"testoverlay","path":"email.ww","contents":"\n{{ if .Tags.email }}eMail: {{ .Tags.email }}{{else}} noMail{{- end }}\n"}`, string(body))
+		// gid and uid values may vary depending on where this test is run. (local box, github, etc)
+		// Assert the keys exist, but ignore the values.
+		var data map[string]interface{}
+		err = json.Unmarshal([]byte(body), &data)
+		assert.NoError(t, err)
+		assert.Contains(t, data, "gid")
+		assert.Contains(t, data, "uid")
+
+		// delete gid and uid from the map for comparison
+		delete(data, "gid")
+		delete(data, "uid")
+
+		body2, err := json.Marshal(data)
+		assert.NoError(t, err)
+
+		assert.JSONEq(t, `{"perms":420, "overlay":"testoverlay","path":"email.ww","contents":"\n{{ if .Tags.email }}eMail: {{ .Tags.email }}{{else}} noMail{{- end }}\n"}`, string(body2))
 	})
 
 	t.Run("create an overlay", func(t *testing.T) {