Extend SnapshotOptions w/ command data

In order to determine whether to save a snapshot, we need to capture the exit code returned by a command. In order to provide a nice error message, we supply stderr as well.

Signed-off-by: Sebastian Hoß <seb@xn--ho-hia.de>

cmd/restic/cmd_backup.go

@@ -676,6 +676,8 @@ func runBackup(ctx context.Context, opts BackupOptions, gopts GlobalOptions, ter
 		Hostname:       opts.Host,
 		ParentSnapshot: parentSnapshot,
 		ProgramVersion: "restic " + version,
+		Command:        command,
+		CommandStderr:  stderr,
 	}
 
 	if !gopts.JSON {

internal/archiver/archiver.go

@@ -2,7 +2,9 @@ package archiver
 
 import (
 	"context"
+	"io"
 	"os"
+	"os/exec"
 	"path"
 	"runtime"
 	"sort"
@@ -681,6 +683,8 @@ type SnapshotOptions struct {
 	Time           time.Time
 	ParentSnapshot *restic.Snapshot
 	ProgramVersion string
+	Command        *exec.Cmd
+	CommandStderr  io.ReadCloser
 }
 
 // loadParentTree loads a tree referenced by snapshot id. If id is null, nil is returned.