[arch-general] Start a daemon, show a syntax error

[Lukas Fleischer]

On Fri, Feb 17, 2012 at 12:03:24PM +0100, Lukas Fleischer wrote:
> On Fri, Feb 17, 2012 at 05:58:31PM +0800, 郑文辉(Techlive Zheng) wrote:
> > 2012/2/17 Lukas Fleischer <archlinux at cryptocrack.de>:
> > > On Fri, Feb 17, 2012 at 05:32:33PM +0800, 大熊 wrote:
> > >> 在 2012年2月17日 下午2:57，Lukas Fleischer <archlinux at cryptocrack.de>写道：
> > >>
> > >> > On Fri, Feb 17, 2012 at 12:35:03PM +0800, 郑文辉(Techlive Zheng) wrote:
> > >> > > 2012/2/17 大熊 <bearsprite at gmail.com>:
> > >> > > > No matter I manual start any a daemon, I always see a error shown on
> > >> > > > console:
> > >> > > >
> > >> > > > /etc/rc.d/functions: line 506: syntax error near unexpected token `('
> > >> > > > /etc/rc.d/functions: line 506: `        done < <(findmnt -mrunRo
> > >> > > > TARGET,FSTYPE,OPTIONS /)
> > >> > > >
> > >> > > > But it seem that the daemon can run correctly, so should I need to fix
> > >> > it
> > >> > > > and how to fix it ?
> > >> > >
> > >> > > I don't know why this bug is always occur again and again.
> > >> > >
> > >> > > The fix is to edit /etc/rc.d/functions, change line 506 to the following:
> > >> > >
> > >> > > done < $(findmnt -mrunRo TARGET,FSTYPE,OPTIONS /)
> > >> >
> > >> > Nope. Don't do that. Post the output of `bash --help | head -1`, `which
> > >> > bash` and `pacman -Qo /bin/bash`.
> > >> >
> > >>
> > >> ➜  ~  bash --help|head -1
> > >> GNU bash, version 4.2.20(2)-release-(i686-pc-linux-gnu)
> > >> ➜  ~  which bash
> > >> /bin/bash
> > >> ➜  ~  pacman -Qo /bin/bash
> > >> /bin/bash is owned by bash 4.2.020-1
> > >> ➜  ~
> > >
> > > Weird... Did you enforce POSIX-compatibility somewhere? How do you start
> > > the daemons? Do you use something broken like `sh rc.d start $foo` or
> > > `sh /etc/rc.d/$foo start`?
> > >
> > > If you don't, the outputs of `pacman -Qo /etc/rc.d/functions`, `head -1
> > > /etc/rc.d/functions` and `head -1 /usr/sbin/rc.d` might be helpful as
> > > well.
> > 
> > I have the same problem.It is all happened at codes like "done <
> > <(some stuff)",but after I changed it to "done < $(some stuff)", all
> > going well.I don't know bash has such a syntax usage?
> 
> "done < $(foo)" isn't the same thing as "done < <(foo)". You break
> scripts by changing that (see "Command Substitution" vs. "Process
> Substitution" in the bash(1) man page). Sounds like process substitution
> support is broken for you which might have occurred because
> 
> a) You're not using bash (e.g. running rc.d(8) in sh(1)/$whatever).
> b) You built bash manually and disabled process substitution support.
> c) You're running bash in POSIX mode.
> d) Something else happened.

e) Someone hacked into your system and changed the shebang of all daemon
   scripts to "#!/bin/sh".