Add uid/gid check in file module

docs/schema.yaml

@@ -111,9 +111,13 @@ definitions:
       owner:
         type: string
         default: root
+      uid:
+        type: integer
       group:
         type: string
         default: root
+      gid:
+        type: integer
       filetype:
         type: string
         default: file

integration-tests/goss/goss-shared.yaml

@@ -23,7 +23,9 @@ file:
     exists: true
     mode: '0644'
     owner: root
+    uid: 0
     group: root
+    gid: 0
     filetype: file
     contents:
     - root

integration-tests/test.sh

@@ -48,9 +48,9 @@ out=$(docker_exec "/goss/$os/goss-linux-$arch" --vars "/goss/vars.yaml" --vars-i
 echo "$out"
 
 if [[ $os == "arch" ]]; then
-    egrep -q 'Count: 100, Failed: 0, Skipped: 3' <<<"$out"
+    egrep -q 'Count: 104, Failed: 0, Skipped: 3' <<<"$out"
 else
-    egrep -q 'Count: 121, Failed: 0, Skipped: 5' <<<"$out"
+    egrep -q 'Count: 125, Failed: 0, Skipped: 5' <<<"$out"
 fi
 
 if [[ ! $os == "arch" ]]; then

resource/file.go

@@ -18,7 +18,9 @@ type File struct {
 	Mode     matcher `json:"mode,omitempty" yaml:"mode,omitempty"`
 	Size     matcher `json:"size,omitempty" yaml:"size,omitempty"`
 	Owner    matcher `json:"owner,omitempty" yaml:"owner,omitempty"`
+	Uid      matcher `json:"uid,omitempty" yaml:"uid,omitempty"`
 	Group    matcher `json:"group,omitempty" yaml:"group,omitempty"`
+	Gid      matcher `json:"gid,omitempty" yaml:"gid,omitempty"`
 	LinkedTo matcher `json:"linked-to,omitempty" yaml:"linked-to,omitempty"`
 	Filetype matcher `json:"filetype,omitempty" yaml:"filetype,omitempty"`
 	Contains matcher `json:"contains,omitempty" yaml:"contains,omitempty"`
@@ -74,9 +76,15 @@ func (f *File) Validate(sys *system.System) []TestResult {
 	if f.Owner != nil {
 		results = append(results, ValidateValue(f, "owner", f.Owner, sysFile.Owner, skip))
 	}
+	if f.Uid != nil {
+		results = append(results, ValidateValue(f, "uid", f.Uid, sysFile.Uid, skip))
+	}
 	if f.Group != nil {
 		results = append(results, ValidateValue(f, "group", f.Group, sysFile.Group, skip))
 	}
+	if f.Gid != nil {
+		results = append(results, ValidateValue(f, "gid", f.Gid, sysFile.Gid, skip))
+	}
 	if f.LinkedTo != nil {
 		results = append(results, ValidateValue(f, "linkedto", f.LinkedTo, sysFile.LinkedTo, skip))
 	}

system/file.go

@@ -25,7 +25,9 @@ type File interface {
 	Size() (int, error)
 	Filetype() (string, error)
 	Owner() (string, error)
+	Uid() (int, error)
 	Group() (string, error)
+	Gid() (int, error)
 	LinkedTo() (string, error)
 	Md5() (string, error)
 	Sha256() (string, error)

system/file_posix.go

@@ -37,6 +37,21 @@ func (f *DefFile) Owner() (string, error) {
 	return getUserForUid(uid)
 }
 
+func (f *DefFile) Uid() (int, error) {
+	uidS, err := f.getFileInfo(func(fi os.FileInfo) string {
+		return fmt.Sprint(fi.Sys().(*syscall.Stat_t).Uid)
+	})
+	if err != nil {
+		return -1, err
+	}
+
+	uid, err := strconv.Atoi(uidS)
+	if err != nil {
+		return -1, err
+	}
+	return uid, nil
+}
+
 func (f *DefFile) Group() (string, error) {
 	gidS, err := f.getFileInfo(func(fi os.FileInfo) string {
 		return fmt.Sprint(fi.Sys().(*syscall.Stat_t).Gid)
@@ -52,6 +67,21 @@ func (f *DefFile) Group() (string, error) {
 	return getGroupForGid(gid)
 }
 
+func (f *DefFile) Gid() (int, error) {
+	gidS, err := f.getFileInfo(func(fi os.FileInfo) string {
+		return fmt.Sprint(fi.Sys().(*syscall.Stat_t).Gid)
+	})
+	if err != nil {
+		return -1, err
+	}
+
+	gid, err := strconv.Atoi(gidS)
+	if err != nil {
+		return -1, err
+	}
+	return gid, nil
+}
+
 func (f *DefFile) getFileInfo(selectorFunc func(os.FileInfo) string) (string, error) {
 	if err := f.setup(); err != nil {
 		return "", err

system/file_windows.go

@@ -11,6 +11,14 @@ func (f *DefFile) Owner() (string, error) {
 	return "-1", nil // not applicable on Windows
 }
 
+func (f *DefFile) Uid() (int, error) {
+	return -1, nil // not applicable on Windows
+}
+
 func (f *DefFile) Group() (string, error) {
 	return "-1", nil // not applicable on Windows
 }
+
+func (f *DefFile) Gid() (int, error) {
+	return -1, nil // not applicable on Windows
+}