/dev/fd should be symlink (was: BASH: Process substitution fails)

Hi,

on the latest edge version of bash, process substitution fails. If you run:

SNIP 8< =

snow:~# read x y z < <(echo 1 2 3); echo $x
-bash: /dev/fd/62: No such file or directory

snow:~#

>8 = SNAP

you get the above error. It usually works.

I already talked to the guys in #bash on freenode and they think (!) it is uclibc related.

On a GNU libc machine one gets this result:

= >8 = SNIP ===

[root@bomber ~]# read x y z < <(echo 1 2 3); echo $x
1
[root@bomber ~]#

SNAP = 8<

Some additional information:

snow:~# apk info bash
bash-4.2.037-r0 description:
The GNU Bourne Again shell

bash-4.2.037-r0 webpage:
http://www.gnu.org/software/bash/bash.html

bash-4.2.037-r0 installed size:
741376

snow:~#

snow:~# set | grep -E ^BASH
BASH=/bin/bash
BASHOPTS=cmdhist:expand_aliases:extglob:extquote:force_fignore:interactive_comments:login_shell:progcomp:promptvars:sourcepath
BASH_ALIASES=()
BASH_ARGC=()
BASH_ARGV=()
BASH_CMDS=()
BASH_COMPLETION=/etc/bash_completion
BASH_COMPLETION_COMPAT_DIR=/etc/bash_completion.d
BASH_COMPLETION_DIR=/etc/bash_completion.d
BASH_LINENO=()
BASH_SOURCE=()
BASH_VERSINFO=([0]=“4” [1]=“2” [2]=“37” [3]=“2” [4]=“release” [5]=“x86_64-unknown-linux-gnu”)
BASH_VERSION=‘4.2.37(2)-release’
snow:~#

cu

(from redmine: issue id 1465, created on 2012-11-10, closed on 2012-12-24)

• Changesets:
  • Revision 20dfee5a by Natanael Copa on 2012-11-19T07:43:25Z:

main/busybox-initscripts: fix /dev/fd symlink

ref #1465

I think the initramfs create /dev/fd as a dir. When mdev-mount later runs
'ln -snf /proc/self/fd /dev/fd' the 'fd' symlink ends up as /dev/fd/fd.

We fix this by always remove /dev/fd before creating the symlink.

• Revision 5ec48327 by Natanael Copa on 2012-11-19T07:57:27Z:

main/udev: make sure /dev/fd is a symlink to /proc/self/fd

ref #1465

• Revision 6438be23 by Natanael Copa on 2012-12-21T16:23:26Z:

main/busybox-initscripts: fix /dev/fd symlink

ref #1465

I think the initramfs create /dev/fd as a dir. When mdev-mount later runs
'ln -snf /proc/self/fd /dev/fd' the 'fd' symlink ends up as /dev/fd/fd.

We fix this by always remove /dev/fd before creating the symlink.
(cherry picked from commit 20dfee5aff22b445738a27d737b31121b709d920)