implement rcat – fixes #230, fixes #1001

cmd/rcat/rcat.go

@@ -0,0 +1,45 @@
+package rcat
+
+import (
+	"log"
+	"os"
+	"time"
+
+	"github.com/ncw/rclone/cmd"
+	"github.com/ncw/rclone/fs"
+	"github.com/spf13/cobra"
+)
+
+func init() {
+	cmd.Root.AddCommand(commandDefintion)
+}
+
+var commandDefintion = &cobra.Command{
+	Use:   "rcat remote:path",
+	Short: `Copies standard input to file on remote.`,
+	Long: `
+rclone rcat reads from standard input (stdin) and copies it to a
+single remote file.
+
+    echo "hello world" | rclone rcat remote:path/to/file
+
+Note that since the size is not known in advance, chunking options
+will likely be ignored. The upload can also not be retried because
+the data is not kept around until the upload succeeds. If you need
+to transfer a lot of data, you're better off caching locally and
+then ` + "`rclone move`" + ` it to the destination.
+`,
+	Run: func(command *cobra.Command, args []string) {
+		cmd.CheckArgs(1, 1, command, args)
+
+		stat, _ := os.Stdin.Stat()
+		if (stat.Mode() & os.ModeCharDevice) != 0 {
+			log.Fatalf("nothing to read from standard input (stdin).")
+		}
+
+		fdst, dstFileName := cmd.NewFsDstFile(args)
+		cmd.Run(false, false, command, func() error {
+			return fs.Rcat(fdst, dstFileName, os.Stdin, time.Now())
+		})
+	},
+}