[Bug 1886300] Re: rename.ul refuses to rename links that don't resolve (regression)

[Mauricio Faria de Oliveira]

Hi Seyeong,

The proposed-migration of util-linux in groovy is blocked on one last
autopkgtest of gfs2-utils failing on ppc64el (the 'mount' test times
out; reproducible even w/ previous versions) [1, 2]

This is new and unrelated to these changes (not uploaded to groovy), but
prevents uploading these changes to Focal as they have to be on Groovy
first.

So, if you have some time and would like to learn/practice/understand
more about how autopkgtests work, and try to repro the bug on the
ppc64el architecture, that would be great. :)

Otherwise I can try to take a look at it when back from time off.

cheers,
Mauricio

[1] https://people.canonical.com/~ubuntu-archive/proposed-migration/update_excuses.html
(search for "util-linux (2.35.2-9ubuntu1 to 2.36-2ubuntu1)")
[2] https://autopkgtest.ubuntu.com/packages/g/gfs2-utils/groovy/ppc64el

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https://bugs.launchpad.net/bugs/1886300

Title:
  rename.ul refuses to rename links that don't resolve (regression)

Status in util-linux package in Ubuntu:
  Fix Committed
Status in util-linux source package in Focal:
  In Progress
Status in util-linux source package in Groovy:
  Fix Committed

Bug description:
  [Impact]

  rename.ul refuses to rename links that don't resolve.

  bionic rename.ul renames links whether or not they resolve (util-linux
  2.31.1-0.4ubuntu3.6).

  focal rename.ul refuses to rename links that don't resolve
  (regression) (util-linux 2.34-0.1ubuntu9).

  Eoan is EOL, so removed.

  
  [Test case]

  Commit has good test case. I paste it here

  Before:

    $ touch file-found
    $ ln -s file-found symlink-1
    $ ./rename sym symbolic- symlink-1	# XPASS.
    $ echo $?
    0

    $ ln -s file-not-found symlink-2
    $ ./rename sym symbolic- symlink-2	# FAIL! REGRESSION.
    rename: symlink-2: not accessible: No such file or directory
    $ echo $?
    1

    $ ./rename sym symbolic- symlink-3	# XFAIL.
    rename: symlink-3: not accessible: No such file or directory
    $ echo $?
    1

    $ touch file-found
    $ ./rename found existing file-found	# XPASS.
    $ echo $?
    0

    $ ./rename found existing file-not-found # XFAIL.
    rename: file-not-found: not accessible: No such file or directory
    $ echo $?
    1

  After:

    $ touch file-found
    $ ln -s file-found symlink-1
    $ ./rename sym symbolic- symlink-1	# XPASS.
    $ echo $?
    0

    $ ln -s file-not-found symlink-2
    $ ./rename sym symbolic- symlink-2	# PASS! REGRESSION FIXED.
    $ echo $?
    0

    $ ./rename sym symbolic- symlink-3	# XFAIL.
    rename: symlink-3: not accessible: No such file or directory
    $ echo $?
    1

    $ touch file-found
    $ ./rename found existing file-found	# XPASS.
    $ echo $?
    0

    $ ./rename found existing file-not-found # XFAIL.
    rename: file-not-found: not accessible: No such file or directory
    $ echo $?
    1

  
  [Regression Potential]
  This commit changes code that checking accessibility to file or sym link. 
  If this fails, rename command will not work properly.it could be crashed or causes failure of rename. 

  
  [Original Description]

  rename.ul refuses to rename links that don't resolve.

  bionic rename.ul renames links whether or not they resolve (util-linux
  2.31.1-0.4ubuntu3.6).

  focal rename.ul refuses to rename links that don't resolve
  (regression) (util-linux 2.34-0.1ubuntu9).

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: util-linux 2.34-0.1ubuntu9
  ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
  Uname: Linux 5.4.0-21-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.3
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Sat Jul  4 20:38:06 2020
  InstallationDate: Installed on 2020-04-05 (90 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200331)
  ProcEnviron:
   LC_TIME=en_DK.utf8
   TERM=screen
   PATH=(custom, no user)
   LANG=en_US.utf8
   SHELL=/bin/bash
  SourcePackage: util-linux
  UpgradeStatus: No upgrade log present (probably fresh install)

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