Re: [Tails-dev] Please review bugfix/fix_background_readahea…

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Szerző: Ague Mill
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Címzett: The Tails public development discussion list
Tárgy: Re: [Tails-dev] Please review bugfix/fix_background_readahead
On Mon, Aug 27, 2012 at 12:51:04AM +0200, intrigeri wrote:
> As you know, I tend to think the problem fixed by this patch is not
> worth the risks involved at this stage of the release process, but my
> extra-carefulness does not extend to vetoing if there is a general
> agreement with applying this patch before rc2.
>
> > +     start-stop-daemon \
> > +        --start --background --pid /var/run/background-readahead.pid --startas /bin/sh -- \
> > +        -c "$BG_FILES | xargs cat >/dev/null 2>&1")

>
> I assume you wanted to write --pidfile, as --pid does not exist in my
> copy of start-stop-daemon. Beware before s/pid/pidfile/, though:
> given --pidfile presence/absence changes quite drastically the
> behavior of start-stop-daemon, if the proposed patch works, then this
> option is probably not needed, is it?


Actually, this works due to GNU getopt magic:

    $ /sbin/start-stop-daemon --start --background --pidfile /tmp/test.pid \
          --startas /bin/sh -- -c 'date > /tmp/test'
    $ /sbin/start-stop-daemon --start --background --pid /tmp/test.pid \
          --startas /bin/sh -- -c 'date > /tmp/test'
    $ /sbin/start-stop-daemon --start --background --pi /tmp/test.pid \
          --startas /bin/sh -- -c 'date > /tmp/test'


This fails:

    $ /sbin/start-stop-daemon --start --background --p /tmp/test.pid \
          --startas /bin/sh -- -c 'date > /tmp/test' 
    /sbin/start-stop-daemon: option '--p' is ambiguous


Getting rid of `--pidfile` also fails:

    $ /sbin/start-stop-daemon --start --background \
          --startas /bin/sh -- -c 'date > /tmp/test'
    /sbin/start-stop-daemon: need at least one of --exec, --pidfile,
    --user or --name


What this made me realize, though, is that `--pidfile` is useless
without `--make-pidfile` in this context.

So I have updated the branch to fully spell `--pidfile` and to also
create that pid file. The broken sed invocation was also fixed, and as
added bonus, the foreground progress bar now goes to 100%.

I still would like to see this reach 0.13~rc2.

--
Ague