[Bug 1326854] [NEW] ambiguous error message "sh: echo: I/O error"

[Karl-Philipp Richter]

Public bug reported:

adding an interface to a bonding interface can result in the error
message "sh: echo: I/O error" which is highly ambiguous (did the I/O
error occur in sh, echo or is it an I/O error realted to the
command/driver? - at least change this to "I/O error occured" which is
still not helpful ("I/O occured in the kernel driver, please make sure
it supports XY, check with <Z>" would be nice), but at least not
confusing.

reproduction:
/etc/wpa_supplicant/wpa_supplicant.conf
<code>
network={
    ssid="assid"
    key_mgmt=WPA-EAP
    eap=TTLS
    proto=WPA RSN
    identity="anidentity at adomain.com"
    anonymous_identity="anonymous at adomain.de"
    ca_cert="/etc/wpa_supplicant/deutsche-telekom-root-ca-2.crt"
    phase2="auth=PAP"
}
</code>
/etc/network/interfaces
<code>
iface main inet dhcp
    wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

iface bond0 inet manual
    down ifenslave -d bond0 wlan0 wlan1
    bond-mode active-backup
    bond-miimon 100
    bond-slaves wlan0 wlan1

allow-bond0 wlan0
iface wlan0 inet manual
    wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf
    bond-master bond0

allow-bond0 wlan1
iface wlan1 inet manual
    wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf
    bond-master bond0

iface eth1 inet dhcp
</code>
my commands
<code>
sudo modprobe bonding
sudo ifup wlan0
sudo ifup wlan1
sudo ifconfig bond0 # no DHCP example, so I've not idea how to get this running :( just providing a way to reproduce the error message (which should in no case be shown with its current content)
sudo ifenslave bond0 wlan0 wlan1
</code>

I'm not requesting support here, just to fix the bug which should make
the former unnecessary anyway :)

** Affects: ifenslave-2.6 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1326854

Title:
  ambiguous error message "sh: echo: I/O error"

Status in “ifenslave-2.6” package in Ubuntu:
  New

Bug description:
  adding an interface to a bonding interface can result in the error
  message "sh: echo: I/O error" which is highly ambiguous (did the I/O
  error occur in sh, echo or is it an I/O error realted to the
  command/driver? - at least change this to "I/O error occured" which is
  still not helpful ("I/O occured in the kernel driver, please make sure
  it supports XY, check with <Z>" would be nice), but at least not
  confusing.

  reproduction:
  /etc/wpa_supplicant/wpa_supplicant.conf
  <code>
  network={
      ssid="assid"
      key_mgmt=WPA-EAP
      eap=TTLS
      proto=WPA RSN
      identity="anidentity at adomain.com"
      anonymous_identity="anonymous at adomain.de"
      ca_cert="/etc/wpa_supplicant/deutsche-telekom-root-ca-2.crt"
      phase2="auth=PAP"
  }
  </code>
  /etc/network/interfaces
  <code>
  iface main inet dhcp
      wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

  iface bond0 inet manual
      down ifenslave -d bond0 wlan0 wlan1
      bond-mode active-backup
      bond-miimon 100
      bond-slaves wlan0 wlan1

  allow-bond0 wlan0
  iface wlan0 inet manual
      wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf
      bond-master bond0

  allow-bond0 wlan1
  iface wlan1 inet manual
      wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf
      bond-master bond0

  iface eth1 inet dhcp
  </code>
  my commands
  <code>
  sudo modprobe bonding
  sudo ifup wlan0
  sudo ifup wlan1
  sudo ifconfig bond0 # no DHCP example, so I've not idea how to get this running :( just providing a way to reproduce the error message (which should in no case be shown with its current content)
  sudo ifenslave bond0 wlan0 wlan1
  </code>

  I'm not requesting support here, just to fix the bug which should make
  the former unnecessary anyway :)

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