[Bug 1840995] [NEW] check_stamp() function of apt.systemd.daily should not assume interval is a number

[Ivan Kurnosov]

Public bug reported:

In the second half of the function there is

    # Calculate the interval in seconds depending on the unit specified
    if [ "${interval%s}" != "$interval" ] ; then
        interval="${interval%s}"
    elif [ "${interval%m}" != "$interval" ] ; then
        interval="${interval%m}"
        interval=$((interval*60))
    elif [ "${interval%h}" != "$interval" ] ; then
        interval="${interval%h}"
        interval=$((interval*60*60))
    else
        interval="${interval%d}"
        interval=$((interval*60*60*24))
    fi

so, a variable might hold something like "1d", "100m", etc.

Yet in the first there is a condition

    if [ "$interval" -eq 0 ]; then
        debug_echo "check_stamp: interval=0"
        # treat as no time has passed
        return 1
    fi

which treats the value as a number and leads to

/usr/lib/apt/apt.systemd.daily: 87: [: Illegal number: 20h

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

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https://bugs.launchpad.net/bugs/1840995

Title:
  check_stamp() function of apt.systemd.daily should not assume interval
  is a number

Status in apt package in Ubuntu:
  New

Bug description:
  In the second half of the function there is

      # Calculate the interval in seconds depending on the unit specified
      if [ "${interval%s}" != "$interval" ] ; then
          interval="${interval%s}"
      elif [ "${interval%m}" != "$interval" ] ; then
          interval="${interval%m}"
          interval=$((interval*60))
      elif [ "${interval%h}" != "$interval" ] ; then
          interval="${interval%h}"
          interval=$((interval*60*60))
      else
          interval="${interval%d}"
          interval=$((interval*60*60*24))
      fi

  so, a variable might hold something like "1d", "100m", etc.

  Yet in the first there is a condition

      if [ "$interval" -eq 0 ]; then
          debug_echo "check_stamp: interval=0"
          # treat as no time has passed
          return 1
      fi

  which treats the value as a number and leads to

  /usr/lib/apt/apt.systemd.daily: 87: [: Illegal number: 20h

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