[2019-04-07 10:52] Cristian Ionescu-Idbohrn <cristian.ionescu-idbo...@axis.com>
> On Sat, 6 Apr 2019, Dmitry Bogatov wrote:
> > [2019-04-05 11:11] Cristian Ionescu-Idbohrn
> > <cristian.ionescu-idbo...@axis.com>
> > > Thing is neither the `:' nor the `true' commands are needed. To
> > > truncate a file it's sufficient to redirect _nothing_ to that file.
> > >
> > > $ dash -c '>/tmp/dir/; echo $?; echo hello world;'
> > > dash: 1: cannot create /tmp/dir/: Is a directory
> > > 2
> > > hello world
> >
> > Nice to know. Is this behaviour mandated by posix?
>
> Not in so many words, but it doesn't say there _must_ be input to
> redirect to stdout or stderr.
>
> http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_07
>
> "The overall format used for redirection is:
>
> [n]redir-op word"
>
> (nothing about input). dash, bash, busybox ash work fine, but not zsh
> (it's waiting for input).
>
> I've been using these redirections for many, many years without any
> ill effects:
>
> >file # truncate or create
> >>file # `touch' or create
>
> > > The real problem is that a failing redirection is _not_ error handled
> > > (in the /etc/init.d/bootmisc.sh case).
> >
> > Sorry, failed to parse. You seems to tell, that there is another problem
> > in 'bootmisc.sh', but I do not understand, which one.
>
> The redirection in /etc/init.d/bootmisc.sh on line 29 is _not_ error
> handled. Writing to a file can fail (for various reasons).
>
> OTOH, the redirection in /lib/init/bootclean.sh on line 22 _is_ error
> handled.
Good catch. Mind to send a patch into a separate bug?
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