rawx: return Last-Modified in HEAD requests

rawx/chunk_info.go

@@ -27,6 +27,7 @@ import (
 	"strconv"
 	"strings"
 	"syscall"
+	"time"
 )
 
 type chunkInfo struct {
@@ -46,6 +47,7 @@ type chunkInfo struct {
 	OioVersion         string `json:"oio_version,omitempty"`
 
 	compression string
+	mtime       time.Time
 	size        int64
 }
 
@@ -231,6 +233,7 @@ func loadAttr(inChunk fileReader, chunkID string, reqid string) (chunkInfo, erro
 		}
 	}
 
+	chunk.mtime = inChunk.mtime()
 	chunk.size, err = strconv.ParseInt(chunk.ChunkSize, 10, 63)
 	if err != nil {
 		err = errMissingXattr(AttrNameChunkSize, err)
@@ -487,6 +490,7 @@ func (chunk chunkInfo) fillHeaders(headers http.Header) {
 	setHeader(headers, HeaderNameChunkChecksum, chunk.ChunkHash)
 	setHeader(headers, HeaderNameChunkSize, chunk.ChunkSize)
 	setHeader(headers, HeaderNameXattrVersion, chunk.OioVersion)
+	setHeader(headers, "Last-Modified", chunk.mtime.Format(time.RFC1123))
 }
 
 // Fill the headers of the reply with the chunk info calculated by the rawx

rawx/filerepo.go

@@ -23,6 +23,7 @@ import (
 	"os"
 	"path/filepath"
 	"strings"
+	"time"
 
 	syscall "golang.org/x/sys/unix"
 )
@@ -393,6 +394,15 @@ func (fr *realFileReader) fd() int {
 	return int(fr.f.Fd())
 }
 
+func (fr *realFileReader) mtime() time.Time {
+	fi, err := fr.f.Stat()
+	if err != nil {
+		return time.Unix(0, 0)
+	} else {
+		return fi.ModTime()
+	}
+}
+
 func (fr *realFileReader) size() int64 {
 	fi, err := fr.f.Stat()
 	if err != nil {

rawx/repo.go

@@ -19,6 +19,7 @@ package main
 import (
 	"io"
 	"os"
+	"time"
 )
 
 type decorable interface {
@@ -31,6 +32,7 @@ type fileReader interface {
 	// Return the underlying os.File
 	File() *os.File
 
+	mtime() time.Time
 	size() int64
 	seek(int64) error
 	getAttr(key string, value []byte) (int, error)