[Bug 937951] Re: An empty Dir::Cache::archives is treated incorrectly and even removes all files in the root folder

[Vladimir Smolensky]

Two problems with this:

1. Even on 16.04 root folder populates with all downloaded/installed debs
2. I have aptly repo on ubuntu 14.04 and aptly cache gets deleted after 30 days because of the /etc/cron.daily/apt cron job that has following lines:

    Cache="/var/cache/apt/archives/"
    eval $(apt-config shell Cache Dir::Cache::archives/d)

    # sanity check
    if [ -z "$Cache" ]; then  <------ This is not Empty bc above returns Cache='/'
        echo "empty Dir::Cache::archives, exiting"
        exit
    fi

    # check age
    if [ ! $MaxAge -eq 0 ] && [ ! $MinAge -eq 0 ]; then
        debug_echo "aged: ctime <$MaxAge and mtime <$MaxAge and ctime>$MinAge and mtime>$MinAge"
        find $Cache -name "*.deb"  \( -mtime +$MaxAge -and -ctime +$MaxAge \) -and -not \( -mtime -$MinAge -or -ctime -$MinAge \) -print0 | xargs -r -0 rm -f
    elif [ ! $MaxAge -eq 0 ]; then
        debug_echo "aged: ctime <$MaxAge and mtime <$MaxAge only"
        find $Cache -name "*.deb"  -ctime +$MaxAge -and -mtime +$MaxAge -print0 | xargs -r -0 rm -f
    else
        debug_echo "skip aging since MaxAge is 0"
    fi


apt-config shell Cache Dir::Cache::archives/d returns
Cache='/'

So any deb files on the system, no matter where get deleted after 30
days!

I haven't changed Cache Dir::Cache::archives, so I suppose this is the
default.

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https://bugs.launchpad.net/bugs/937951

Title:
  An empty Dir::Cache::archives is treated incorrectly and even removes
  all files in the root folder

Status in APT:
  Invalid
Status in apt package in Ubuntu:
  Invalid

Bug description:
  From apt.conf(5):
  Dir::Cache contains locations pertaining to local cache information,
  such as the two package caches srcpkgcache and pkgcache as well
  as the location to place downloaded archives, Dir::Cache::archives.
  Generation of caches can be turned off by setting their names to
  be blank

  Following this documentation, I created /etc/apt/apt.conf.d/30nocache
  containing the below line to disable the cache:
  Dir::Cache::archives "";

  To my surprise, the directory /partial is created and downloaded .deb
  files get into / as well as the lock file. Even worse, when apt-get clean
  is executed, all files under / get removed!

  # apt-get -s clean
  Del /* /partial/*

  Please fix the documentation and/ or prevent /* from being removed.

  Affected versions:
  - 0.8.16~exp5ubuntu13 (Ubuntu Oneiric)
  - 0.8.10.3+squeeze1 (Debian Squeeze)

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