[Bug 1896251] Re: rsync --delete-missing-args fails with "error: protocol incompatibility"

[Sergio Durigan Junior]

Thanks for the bug report, Mikko.

I confirmed that this bug happens on both Bionic and Focal, but doesn't
happen (or at least doesn't happen in the same way) on Groovy.

Bear in mind that, when running this command using Groovy's rsync, I
see:

$ rsync --delete-missing-args --files-from=list a b
file has vanished: "/tmp/rsync-bug/a/1/2"
WARNING: parent dir is absent in the file list: 1/2
default_perms_for_dir: sys_acl_get_file(1/2, ACL_TYPE_DEFAULT): No such file or directory, falling back on umask
rsync warning: some files vanished before they could be transferred (code 24) at main.c(1330) [sender=3.2.3]

This is a different error from the one reported in the bug, and I think
it's worth investigating whether it is another bug, or if it's just an
expected error this time.

FWIW, the patch needed to be backport in order to fix the initial bug on
Bionic/Focal rsync is:

commit af6118d98b3482cbcfc223bf2a0777bc19eccb02
Author:     Wayne Davison <wayne at opencoder.net>
AuthorDate: Sun Apr 26 18:02:17 2020 -0700
Commit:     Wayne Davison <wayne at opencoder.net>
CommitDate: Sun Apr 26 18:10:40 2020 -0700

    Allow a missing parent dir when --delete-missing-args was specified.

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to rsync in Ubuntu.
https://bugs.launchpad.net/bugs/1896251

Title:
  rsync --delete-missing-args fails with "error: protocol
  incompatibility"

Status in rsync package in Ubuntu:
  New
Status in rsync source package in Xenial:
  Triaged
Status in rsync source package in Bionic:
  Triaged
Status in rsync source package in Focal:
  Triaged

Bug description:
  Running

     rsync --delete-missing-args --files-from=...

  fails with error message like

  ABORTING due to invalid path from sender: dir1/dir2/dir3
  rsync error: protocol incompatibility (code 2) at generator.c(1271) [generator=3.1.2]

  if the listed directories are trying to delete full subtree of files.

  According to https://bugzilla.samba.org/show_bug.cgi?id=12569 this has
  been fixed in version 3.2.2.

  See also: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=863334

  Could you update the rsync package or backport the fix?

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: rsync 3.1.2-2.1ubuntu1.1
  ProcVersionSignature: Ubuntu 5.4.0-47.51~18.04.1-lowlatency 5.4.55
  Uname: Linux 5.4.0-47-lowlatency x86_64
  ApportVersion: 2.20.9-0ubuntu7.17
  Architecture: amd64
  CurrentDesktop: MATE
  Date: Fri Sep 18 18:27:53 2020
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2019-01-05 (621 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
  SourcePackage: rsync
  UpgradeStatus: No upgrade log present (probably fresh install)

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/rsync/+bug/1896251/+subscriptions