[Bug 1991527] [NEW] Upgrade tries to parse files in hidden directory

[Ralf G. R. Bergs]

Public bug reported:

I was trying to upgrade Ubuntu Server from "focal" (don't know exact
version no, sorry) to "jammy" (Ubuntu 22.04.1 LTS).

After I had started "do-release-upgrade" (1:22.04.14) this tool crashed,
trying to parse binary files in the below directory:

/etc/pam.d/.svn

It seems that it was enumerating all files in /etc/pam.d/, but it didn't
ignore files in a "hidden" directory (starting with a "dot"), so it came
across some Subversion (ancient version control system) binary file and
barfed about it.

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1991527

Title:
  Upgrade tries to parse files in hidden directory

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  I was trying to upgrade Ubuntu Server from "focal" (don't know exact
  version no, sorry) to "jammy" (Ubuntu 22.04.1 LTS).

  After I had started "do-release-upgrade" (1:22.04.14) this tool
  crashed, trying to parse binary files in the below directory:

  /etc/pam.d/.svn

  It seems that it was enumerating all files in /etc/pam.d/, but it
  didn't ignore files in a "hidden" directory (starting with a "dot"),
  so it came across some Subversion (ancient version control system)
  binary file and barfed about it.

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