Add Dev, Nlink, and Ino to pkg/system/Stat struct

podman needs to look at the Device, Inode and number of links of a file, but needs this to work on Windows and Darwin. We are using this information to determine if a file is a hard link whe tarring it up. Add new function FileInfoToStatT to transate a FileInfor into the StatT struct. Signed-off-by: Daniel J Walsh <[email protected]>
containers · May 21, 2021 · 743a500 · 743a500
1 parent e4bea9a
commit 743a500
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Showing 6 changed files with 82 additions and 26 deletions.
diff --git a/pkg/system/lstat_windows.go b/pkg/system/lstat_windows.go
@@ -10,5 +10,5 @@ func Lstat(path string) (*StatT, error) {
 		return nil, err
 	}
 
-	return fromStatT(&fi)
+	return FileInfoToStatT(fi)
 }
diff --git a/pkg/system/stat_darwin.go b/pkg/system/stat_darwin.go
@@ -5,9 +5,12 @@ import "syscall"
 // fromStatT converts a syscall.Stat_t type to a system.Stat_t type
 func fromStatT(s *syscall.Stat_t) (*StatT, error) {
 	return &StatT{size: s.Size,
-		mode: uint32(s.Mode),
-		uid:  s.Uid,
-		gid:  s.Gid,
-		rdev: uint64(s.Rdev),
-		mtim: s.Mtimespec}, nil
+		mode:  uint32(s.Mode),
+		uid:   s.Uid,
+		gid:   s.Gid,
+		rdev:  uint64(s.Rdev),
+		dev:   uint64(s.Dev),
+		ino:   s.Ino,
+		nlink: uint64(s.Nlink),
+		mtim:  s.Mtimespec}, nil
 }
diff --git a/pkg/system/stat_linux.go b/pkg/system/stat_linux.go
@@ -5,11 +5,14 @@ import "syscall"
 // fromStatT converts a syscall.Stat_t type to a system.Stat_t type
 func fromStatT(s *syscall.Stat_t) (*StatT, error) {
 	return &StatT{size: s.Size,
-		mode: s.Mode,
-		uid:  s.Uid,
-		gid:  s.Gid,
-		rdev: uint64(s.Rdev),
-		mtim: s.Mtim}, nil
+		mode:  s.Mode,
+		uid:   s.Uid,
+		gid:   s.Gid,
+		rdev:  uint64(s.Rdev),
+		dev:   s.Dev,
+		ino:   s.Ino,
+		nlink: s.Nlink,
+		mtim:  s.Mtim}, nil
 }
 
 // FromStatT converts a syscall.Stat_t type to a system.Stat_t type

diff --git a/pkg/system/stat_unix.go b/pkg/system/stat_unix.go
@@ -11,12 +11,15 @@ import (
 // StatT type contains status of a file. It contains metadata
 // like permission, owner, group, size, etc about a file.
 type StatT struct {
-	mode uint32
-	uid  uint32
-	gid  uint32
-	rdev uint64
-	size int64
-	mtim syscall.Timespec
+	mode  uint32
+	uid   uint32
+	gid   uint32
+	rdev  uint64
+	size  int64
+	mtim  syscall.Timespec
+	dev   uint64
+	ino   uint64
+	nlink uint64
 }
 
 // Mode returns file's permission mode.
@@ -72,3 +75,23 @@ func Fstat(fd int) (*StatT, error) {
 	}
 	return fromStatT(s)
 }
+
+// Dev returns device identifier the file is stored on
+func (s StatT) Dev() uint64 {
+	return s.dev
+}
+
+// Ino returns inode the file is stored on
+func (s StatT) Ino() uint64 {
+	return s.ino
+}
+
+// Nlink returns number of hard links to the file
+func (s StatT) Nlink() uint64 {
+	return s.nlink
+}
+
+// StatT converts a syscall.Stat_t type to a system.Stat_t type
+func FileInfoToStatT(fi os.FileInfo) (*StatT, error) {
+	return fromStatT(fi.Sys().(*syscall.Stat_t))
+}
diff --git a/pkg/system/stat_unix_test.go b/pkg/system/stat_unix_test.go
@@ -38,4 +38,13 @@ func TestFromStatT(t *testing.T) {
 	if stat.Mtim != s.Mtim() {
 		t.Fatal("got invalid mtim")
 	}
+	if stat.Dev != s.Dev() {
+		t.Fatal("got invalid dev")
+	}
+	if stat.Nlink != s.Nlink() {
+		t.Fatal("got invalid nlink")
+	}
+	if stat.Ino != s.Ino() {
+		t.Fatal("got invalid inode")
+	}
 }
diff --git a/pkg/system/stat_windows.go b/pkg/system/stat_windows.go
@@ -8,9 +8,27 @@ import (
 // StatT type contains status of a file. It contains metadata
 // like permission, size, etc about a file.
 type StatT struct {
-	mode os.FileMode
-	size int64
-	mtim time.Time
+	mode  os.FileMode
+	size  int64
+	mtim  time.Time
+	dev   uint64
+	ino   uint64
+	nlink uint64
+}
+
+// Dev returns device identifier the file is stored on
+func (s StatT) Dev() uint64 {
+	return s.dev
+}
+
+// Ino returns inode the file is stored on
+func (s StatT) Ino() uint64 {
+	return s.ino
+}
+
+// Nlink returns number of hard links to the file
+func (s StatT) Nlink() uint64 {
+	return s.nlink
 }
 
 // Size returns file's size.
@@ -51,13 +69,13 @@ func Stat(path string) (*StatT, error) {
 	if err != nil {
 		return nil, err
 	}
-	return fromStatT(&fi)
+	return FileInfoToStatT(fi)
 }
 
-// fromStatT converts a os.FileInfo type to a system.StatT type
-func fromStatT(fi *os.FileInfo) (*StatT, error) {
+// FileInfoToStatT converts a os.FileInfo type to a system.StatT type
+func FileInfoToStatT(fi os.FileInfo) (*StatT, error) {
 	return &StatT{
-		size: (*fi).Size(),
-		mode: (*fi).Mode(),
-		mtim: (*fi).ModTime()}, nil
+		size: fi.Size(),
+		mode: fi.Mode(),
+		mtim: fi.ModTime()}, nil
 }