[Bug 1077505] [NEW] display command in /etc/mailcap needs quote escaping

[Waldir]

Public bug reported:

I am not sure how, but apparently the line 
  image/png; display png:'%s'; test=test -n "$DISPLAY"; priority=2
(line 22 of the usr/lib/mime/packages/imagemagick file in the deb package)
becomes:
  image/png; display 'png:'%s''; test=test -n "$DISPLAY"
in /etc/mailcap, as revealed by the command cat /etc/mailcap | grep "png".

The problem is the nested single quote symbols; the inner ones are not escaped so this results in a parsing error when running the command
  see image.png
which results in: 
sh: 1: Syntax error: Unterminated quoted string
Warning: program returned non-zero exit code #2

Running "see" with the --debug option returns:
 - parsing parameter "image.png"
 - Reading mime.types file "/etc/mime.types"...
 - extension "png" maps to mime-type "image/png"
 - Reading mailcap file "/etc/mailcap"...
Processing file "image.png" of type "image/png" (encoding=none)...
 - checking mailcap entry "image/png; display 'png:'%s''; test=test -n "$DISPLAY""
 - program to execute: display 'png:'%s''
 - running test: test -n "$DISPLAY"  (result=0=true)
 - executing: display 'png:'image.png'
sh: 1: Syntax error: Unterminated quoted string
Warning: program returned non-zero exit code #2

This is not exclusive of the png format; all the invocations of the
display command in /etc/mailcap have the same problem.

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

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https://bugs.launchpad.net/bugs/1077505

Title:
  display command in /etc/mailcap needs quote escaping

Status in “imagemagick” package in Ubuntu:
  New

Bug description:
  I am not sure how, but apparently the line 
    image/png; display png:'%s'; test=test -n "$DISPLAY"; priority=2
  (line 22 of the usr/lib/mime/packages/imagemagick file in the deb package)
  becomes:
    image/png; display 'png:'%s''; test=test -n "$DISPLAY"
  in /etc/mailcap, as revealed by the command cat /etc/mailcap | grep "png".

  The problem is the nested single quote symbols; the inner ones are not escaped so this results in a parsing error when running the command
    see image.png
  which results in: 
  sh: 1: Syntax error: Unterminated quoted string
  Warning: program returned non-zero exit code #2

  Running "see" with the --debug option returns:
   - parsing parameter "image.png"
   - Reading mime.types file "/etc/mime.types"...
   - extension "png" maps to mime-type "image/png"
   - Reading mailcap file "/etc/mailcap"...
  Processing file "image.png" of type "image/png" (encoding=none)...
   - checking mailcap entry "image/png; display 'png:'%s''; test=test -n "$DISPLAY""
   - program to execute: display 'png:'%s''
   - running test: test -n "$DISPLAY"  (result=0=true)
   - executing: display 'png:'image.png'
  sh: 1: Syntax error: Unterminated quoted string
  Warning: program returned non-zero exit code #2

  This is not exclusive of the png format; all the invocations of the
  display command in /etc/mailcap have the same problem.

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