[Bug 1044466] [NEW] fails to write to coproc with "bad fd" from a compound command or subshell

[Ivan Zakharyaschev]

Public bug reported:

When redirecting to the fd connected to a coproc, bash fails with "bad
file descriptor" message.

The code is like this -- https://gitorious.org/rpush-cat/rpush-cat/blobs
/continue-coproc/rpush-continue#line34 (mirror: http://repo.or.cz/w
/rpush-cat.git/blob/refs/heads/continue-coproc:/rpush-continue#l34 ):

coproc ssh "$@" -e none "ls -l $DEST && cat >> $DEST"

DESTsize="$(readSizeAndroidls <&${COPROC[0]}- )" || exit $?
SRCsize="$(ls -l "$SRC" | readSizeUnixls)"
( tail -c +$((DESTsize+1)) "$SRC" | pv --wait --size $((SRCsize-DESTsize)); ) >&${COPROC[1]}-

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: bash 4.2-2ubuntu2
Uname: Linux 3.0.27-1-ac100 armv7l
ApportVersion: 2.0.1-0ubuntu12
Architecture: armhf
Date: Sat Sep  1 03:40:04 2012
SourcePackage: bash
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: gnubash
     Importance: Undecided
         Status: New

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

** Affects: bash (Debian)
     Importance: Unknown
         Status: Unknown


** Tags: apport-bug armhf coproc precise redirection running-unity subshell

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https://bugs.launchpad.net/bugs/1044466

Title:
  fails to write to coproc with "bad fd" from a compound command or
  subshell

Status in The GNU Bash Shell:
  New
Status in “bash” package in Ubuntu:
  New
Status in “bash” package in Debian:
  Unknown

Bug description:
  When redirecting to the fd connected to a coproc, bash fails with "bad
  file descriptor" message.

  The code is like this -- https://gitorious.org/rpush-cat/rpush-
  cat/blobs/continue-coproc/rpush-continue#line34 (mirror:
  http://repo.or.cz/w/rpush-cat.git/blob/refs/heads/continue-coproc
  :/rpush-continue#l34 ):

  coproc ssh "$@" -e none "ls -l $DEST && cat >> $DEST"

  DESTsize="$(readSizeAndroidls <&${COPROC[0]}- )" || exit $?
  SRCsize="$(ls -l "$SRC" | readSizeUnixls)"
  ( tail -c +$((DESTsize+1)) "$SRC" | pv --wait --size $((SRCsize-DESTsize)); ) >&${COPROC[1]}-

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: bash 4.2-2ubuntu2
  Uname: Linux 3.0.27-1-ac100 armv7l
  ApportVersion: 2.0.1-0ubuntu12
  Architecture: armhf
  Date: Sat Sep  1 03:40:04 2012
  SourcePackage: bash
  UpgradeStatus: No upgrade log present (probably fresh install)

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