[Bug 598279] Re: read builtin can't handle some synthetic files

[Brian Murray]

*** This bug is a duplicate of bug 598275 ***
    https://bugs.launchpad.net/bugs/598275

** This bug has been marked a duplicate of bug 598275
   read() builtin doesn't work with /proc files containing only an integer value

** Tags added: udd-find

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https://bugs.launchpad.net/bugs/598279

Title:
  read builtin can't handle some synthetic files

Status in “dash” package in Ubuntu:
  New
Status in “dash” package in Debian:
  Confirmed

Bug description:
  Binary package hint: dash

  Ubuntu 10.04 LTS, dash 0.5.5.1-3ubuntu2.

  Dash's read builtin fails when trying to read some files under /proc,
  e.g. almost every file under /proc/sys/net/ipv4.  To make matters
  worse, it sets the output environment variable to the first byte of
  the file.  This means that scripts that only check the resulting env
  var may use bad data.  This is the cause of bug #598275.  Here's my
  test case:

    dash# ls -l /proc/sys/net/ipv4/netfilter/ip_conntrack_max
    -rw-r--r-- 1 root root 0 Jun 24 14:00 /proc/sys/net/ipv4/netfilter/ip_conntrack_max
    dash# cat /proc/sys/net/ipv4/netfilter/ip_conntrack_max
    7852
    dash# read out </proc/sys/net/ipv4/netfilter/ip_conntrack_max
    dash# echo $?
    1
    dash# echo $out
    7

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