[Bug 1915568] [NEW] lessfile is broken when using ~/.lessfilter

[Ash Holland]

Public bug reported:

If ~/.lessfilter exists and is used by lesspipe/lessfile, then lessfile
will make the filename of the temporary file visible in less. The
attached patch fixes this. (The filename is echoed to less after the
subshell exits; trying to do it inside the subshell means it ends up
looking to less like part of the file being viewed.)

To test this, you can place the following file at ~/.lessfilter:

#!/bin/sh
echo foo
exit 0

Then opening any file in less (assuming you have lessfile set up) should
show "foo". The bug is that, currently, it also shows a filename from
somewhere in /tmp.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: less 487-0.1
ProcVersionSignature: Ubuntu 4.15.0-135.139-generic 4.15.18
Uname: Linux 4.15.0-135-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.23
Architecture: amd64
CurrentDesktop: Unity7
Date: Fri Feb 12 21:25:34 2021
Dependencies:
 debianutils 4.8.4
 gcc-8-base 8.4.0-1ubuntu1~18.04
 libc6 2.27-3ubuntu1.4
 libgcc1 1:8.4.0-1ubuntu1~18.04
 libtinfo5 6.1-1ubuntu1.18.04
InstallationDate: Installed on 2018-08-13 (914 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
SourcePackage: less
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: less (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic

** Patch added: "fix-lessfile-with-lessfilter.patch"
   https://bugs.launchpad.net/bugs/1915568/+attachment/5463304/+files/fix-lessfile-with-lessfilter.patch

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https://bugs.launchpad.net/bugs/1915568

Title:
  lessfile is broken when using ~/.lessfilter

Status in less package in Ubuntu:
  New

Bug description:
  If ~/.lessfilter exists and is used by lesspipe/lessfile, then
  lessfile will make the filename of the temporary file visible in less.
  The attached patch fixes this. (The filename is echoed to less after
  the subshell exits; trying to do it inside the subshell means it ends
  up looking to less like part of the file being viewed.)

  To test this, you can place the following file at ~/.lessfilter:

  #!/bin/sh
  echo foo
  exit 0

  Then opening any file in less (assuming you have lessfile set up)
  should show "foo". The bug is that, currently, it also shows a
  filename from somewhere in /tmp.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: less 487-0.1
  ProcVersionSignature: Ubuntu 4.15.0-135.139-generic 4.15.18
  Uname: Linux 4.15.0-135-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu7.23
  Architecture: amd64
  CurrentDesktop: Unity7
  Date: Fri Feb 12 21:25:34 2021
  Dependencies:
   debianutils 4.8.4
   gcc-8-base 8.4.0-1ubuntu1~18.04
   libc6 2.27-3ubuntu1.4
   libgcc1 1:8.4.0-1ubuntu1~18.04
   libtinfo5 6.1-1ubuntu1.18.04
  InstallationDate: Installed on 2018-08-13 (914 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
  SourcePackage: less
  UpgradeStatus: No upgrade log present (probably fresh install)

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