[Buildroot] [PATCH] dependencies.sh: improve the missing perl modules detection

[Vicente Olivert Riera <Vincent.Riera@imgtec.com>]

Dear Baruch Siach,

On 23/09/15 20:50, Baruch Siach wrote:
> Hi Vincent,
>
> On Wed, Sep 23, 2015 at 02:44:21PM +0100, Vicente Olivert Riera wrote:
>> Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
>> ---
>>   support/dependencies/dependencies.sh |   26 +++++++++++++++++++++-----
>>   1 files changed, 21 insertions(+), 5 deletions(-)
>>
>> diff --git a/support/dependencies/dependencies.sh b/support/dependencies/dependencies.sh
>> index 01ad828..af9aefe 100755
>> --- a/support/dependencies/dependencies.sh
>> +++ b/support/dependencies/dependencies.sh
>> @@ -236,10 +236,26 @@ if grep -q ^BR2_HOSTARCH_NEEDS_IA32_COMPILER=y $BR2_CONFIG ; then
>>   	fi
>>   fi
>>
>> -# Check that the Perl installation is complete enough to build
>> -# host-autoconf.
>
> The information that we need perl for host-autoconf should be preserved, I
> think.
>
>> -if ! perl  -e "require Data::Dumper" > /dev/null 2>&1 ; then
>> -	echo "Your Perl installation is not complete enough, at least Data::Dumper is missing."
>> -	echo "On Debian/Ubuntu distributions, install the 'perl' package."
>
> You are also removing this bit of valuable information.
>
> Maybe we should split this into two checks, one for perl itself, and then for
> some required modules. That would allow us to give the user a more precise
> diagnosis.

I really thought about that before removing the advice about which 
package provides that missing perl module. But then I thought about it 
twice and I believe is not really so valuable. I think every Linux user 
should be able to know which package of the distribution that he is 
using provides those missing perl modules. We just say the missing 
modules and is up to the user to install the packages which provide 
those modules. Is not so hard, in my opinion. Also, in some distros the 
package has one name, and in other distros has a different name. We 
can't put all of them so having only the ones for Debian/Ubuntu only 
help part of the users, and not the other.

For me the patch is good as is. If other developers think the same as 
you, I really don't have any problem that someone else overtake this 
patch and make the desired modifications. Absolutely no problem at all :-)

Regards,

Vincent.

>
>> +# Check that the Perl installation is complete enough for Buildroot.
>> +# Here is the space-separated list of the required modules:
>> +required_perl_modules="Data::Dumper Thread:Queue"
>> +
>> +# This variable will keep the modules that are missing in your system:
>> +missing_perl_modules=""
>> +
>> +for pm in $required_perl_modules ; do
>> +	if ! perl  -e "require $pm" > /dev/null 2>&1 ; then
>> +		missing_perl_modules="$missing_perl_modules $pm"
>> +	fi
>> +done
>> +
>> +if [ -n "$missing_perl_modules" ] ; then
>> +	echo "Your Perl installation is not complete enough; at least the following"
>> +	echo "modules are missing:"
>> +	echo ""
>> +	for pm in $missing_perl_modules ; do
>> +		echo -e "\t $pm"
>> +	done
>> +	echo ""
>>   	exit 1
>>   fi
>
> baruch
>