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Verify rsync protocol version match prior to proceeding - Rebased on current master. #71

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merged 7 commits into from
Jul 2, 2020
Merged

Verify rsync protocol version match prior to proceeding - Rebased on current master. #71

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f745670
Verify rsync protocol version match prior to proceeding.
stephenwithav Jul 1, 2020
5538af6
Add context to sync.Version.
stephenwithav Jul 1, 2020
54cecb2
Correct syncCmd.version, sync.Version.
stephenwithav Jul 2, 2020
35ee1de
Update local, remote version checks to avoid blanks.
stephenwithav Jul 2, 2020
21976c6
Remove go from io.Copy in internal/sync/sync.go#Version
stephenwithav Jul 2, 2020
d853066
Return error directly in internal/sync/sync.go#Version
stephenwithav Jul 2, 2020
e8abef2
Update [vV]ersion comment strings; remove extraneous error check.
stephenwithav Jul 2, 2020
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31 changes: 31 additions & 0 deletions cmd/coder/sync.go
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Original file line number Diff line number Diff line change
@@ -1,7 +1,11 @@
package main

import (
"bytes"
"fmt"
"log"
"os"
"os/exec"
"path/filepath"
"strings"

Expand Down Expand Up @@ -29,6 +33,23 @@ func (cmd *syncCmd) RegisterFlags(fl *pflag.FlagSet) {
fl.BoolVarP(&cmd.init, "init", "i", false, "do initial transfer and exit")
}

// version returns local rsync protocol version as a string.
func (_ *syncCmd) version() string {
cmd := exec.Command("rsync", "--version")
out, err := cmd.CombinedOutput()
if err != nil {
log.Fatal(err)
}

firstLine, err := bytes.NewBuffer(out).ReadString('\n')
if err != nil {
log.Fatal(err)
}
versionString := strings.Split(firstLine, "protocol version ")

return versionString[1]
}

func (cmd *syncCmd) Run(fl *pflag.FlagSet) {
var (
local = fl.Arg(0)
Expand Down Expand Up @@ -71,6 +92,16 @@ func (cmd *syncCmd) Run(fl *pflag.FlagSet) {
LocalDir: absLocal,
Client: entClient,
}

localVersion := cmd.version()
remoteVersion, rsyncErr := s.Version()

if rsyncErr != nil {
flog.Info("Unable to determine remote rsync version. Proceeding cautiously.")
} else if localVersion != remoteVersion {
flog.Fatal(fmt.Sprintf("rsync protocol mismatch. %s.", localVersion, rsyncErr))
}

for err == nil || err == sync.ErrRestartSync {
err = s.Run()
}
Expand Down
40 changes: 40 additions & 0 deletions internal/sync/sync.go
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
package sync

import (
"bytes"
"context"
"errors"
"fmt"
Expand All @@ -10,6 +11,7 @@ import (
"os/exec"
"path"
"path/filepath"
"strings"
"sync"
"sync/atomic"
"time"
Expand Down Expand Up @@ -261,6 +263,44 @@ const (
maxAcceptableDispatch = time.Millisecond * 50
)

// Version returns remote protocol version as a string.
// Or, an error if one exists.
func (s Sync) Version() (string, error) {
ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
defer cancel()

conn, err := s.Client.DialWsep(ctx, s.Env)
if err != nil {
return "", err
}
defer conn.Close(websocket.CloseNormalClosure, "")

execer := wsep.RemoteExecer(conn)
process, err := execer.Start(ctx, wsep.Command{
Command: "rsync",
Args: []string{"--version"},
})
if err != nil {
return "", err
}
buf := &bytes.Buffer{}
io.Copy(buf, process.Stdout())

err = process.Wait()
if err != nil {
return "", err
}

firstLine, err := buf.ReadString('\n')
if err != nil {
return "", err
}

versionString := strings.Split(firstLine, "protocol version ")

return versionString[1], nil
}

// Run starts the sync synchronously.
// Use this command to debug what wasn't sync'd correctly:
// rsync -e "coder sh" -nicr ~/Projects/cdr/coder-cli/. ammar:/home/coder/coder-cli/
Expand Down