[Buildroot] [PATCH v2 1/6] support/download: Add support to pass options directly to downloaders
Yann E. MORIN
yann.morin.1998 at free.fr
Sun Jul 24 14:04:01 UTC 2016
Thomas, Romain, All,
On 2016-07-24 16:00 +0200, Thomas Petazzoni spake thusly:
> On Fri, 15 Jul 2016 22:47:29 +0200, Yann E. MORIN wrote:
>
> > > ---
> > [--SNIP--]
> > > diff --git a/support/download/bzr b/support/download/bzr
> > > index e18b01f..9443e03 100755
> > > --- a/support/download/bzr
> > > +++ b/support/download/bzr
> > > @@ -25,6 +25,7 @@ output="${1}"
> > > repo="${2}"
> > > rev="${3}"
> > > basename="${4}"
> > > +dl_opts="${5}"
> >
> > So we expect the additional options to be pased as a single string?
> > Why not use something like:
> >
> > shift 4 # Get rid of our options
> >
> > and then:
> >
> > _bzr export ${verbose} --root="'${basename}/'" --format=tgz \
> > ${timestamp_opt} - "'${repo}'" -r "'${rev}'" \
> > ${timestamp_opt} - "${@}" "'${repo}'" -r "'${rev}'" \
> >
> > Ditto for all backends, of course.
> >
> > Note: I wrote the above after writing the comment below; that construct
> > above would fix the concerns I expressed below.
> >
> > (I'm hard to follow, am I not? My brain is really tortuous... ;-] )
>
> Below, you're concerned that "${dl_opts}" will lead to a problem as it
> will be an empty "" if no options are passed. But you suggest to use
> "${@}" instead, still with "". How does that fix the particular problem
> you mentioned below?
Because "${@}" expands to nothing if there is no paramter.
http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18
@
Expands to the positional parameters, starting from one. When the
expansion occurs within double-quotes, and where field splitting (see
Field Splitting) is performed, each positional parameter shall expand
as a separate field [...]. If there are no positional parameters, the
expansion of '@' shall generate zero fields, even when '@' is
double-quoted.
Regards,
Yann E. MORIN.
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