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Id: 90335
Status: resolved
Priority: 0/
Queue: App-FatPacker

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Owner: Nobody in particular
Requestors: djerius [...] cpan.org
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Bug Information
Severity: Wishlist
Broken in: (no value)
Fixed in: 0.010000



Subject: Module::Pluggable interoperability
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I'm interested in fatpacking an application which uses Module::Pluggable. The application ships with a default set of plugins, but unfortunately Module::Pluggable cannot find them as it queries the filesystem for plugins, and the packed ones don't live there. I'd like to suggest that App::FatPacker insert an object into @INC which would provide a defined interface which Module::Pluggable could query to determine the list of modules packed. I'm willing to provide code, etc., if this idea seems interesting. Thanks, Diab (See also https://rt.cpan.org/Ticket/Display.html?id=90317)
On Wed Nov 13 11:46:21 2013, DJERIUS wrote: Show quoted text
> I'm interested in fatpacking an application which uses > Module::Pluggable. The application ships with a default set of > plugins, but unfortunately Module::Pluggable cannot find them as it > queries the filesystem for plugins, and the packed ones don't live > there. > > I'd like to suggest that App::FatPacker insert an object into @INC > which would provide a defined interface which Module::Pluggable could > query to determine the list of modules packed. > > I'm willing to provide code, etc., if this idea seems interesting. > > Thanks, > > Diab > > (See also https://rt.cpan.org/Ticket/Display.html?id=90317)
I found I had the same problem when trying to create a fatpacked cpanp. CPANPLUS uses Module::Pluggable and the fatpacked cpanp couldn't load fatpacked CPANPLUS plugins. My efforts are in the CPANPLUS repository if anyone is interested. https://github.com/jib/cpanplus-devel/blob/master/dev-bin/fatpack.pl#L96 https://github.com/jib/cpanplus-devel/blob/master/dev-bin/Module-Pluggable.patch
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On Wed Nov 13 14:46:56 2013, BINGOS wrote: Show quoted text
> On Wed Nov 13 11:46:21 2013, DJERIUS wrote:
> > I'm interested in fatpacking an application which uses > > Module::Pluggable. The application ships with a default set of > > plugins, but unfortunately Module::Pluggable cannot find them as it > > queries the filesystem for plugins, and the packed ones don't live > > there. > > > > I'd like to suggest that App::FatPacker insert an object into @INC > > which would provide a defined interface which Module::Pluggable could > > query to determine the list of modules packed. > > > > I'm willing to provide code, etc., if this idea seems interesting. > > > > Thanks, > > > > Diab > > > > (See also https://rt.cpan.org/Ticket/Display.html?id=90317)
> > I found I had the same problem when trying to create a fatpacked > cpanp. > > CPANPLUS uses Module::Pluggable and the fatpacked cpanp couldn't load > fatpacked CPANPLUS plugins. > > My efforts are in the CPANPLUS repository if anyone is interested. > > https://github.com/jib/cpanplus-devel/blob/master/dev- > bin/fatpack.pl#L96 > > https://github.com/jib/cpanplus-devel/blob/master/dev-bin/Module- > Pluggable.patch
I don't use Module::Pluggable, but I've had to deal with the same problem. I ended up using a similar solution: https://github.com/haarg/App-BCSSH/blob/master/maint/pack#L129
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I got a prototype working by looking for the presence of %main::fatpacked but that's obviously not a great longterm solution. On Wed Nov 13 16:03:39 2013, haarg wrote: Show quoted text
> On Wed Nov 13 14:46:56 2013, BINGOS wrote:
> > On Wed Nov 13 11:46:21 2013, DJERIUS wrote:
> > > I'm interested in fatpacking an application which uses > > > Module::Pluggable. The application ships with a default set of > > > plugins, but unfortunately Module::Pluggable cannot find them as it > > > queries the filesystem for plugins, and the packed ones don't live > > > there. > > > > > > I'd like to suggest that App::FatPacker insert an object into @INC > > > which would provide a defined interface which Module::Pluggable > > > could > > > query to determine the list of modules packed. > > > > > > I'm willing to provide code, etc., if this idea seems interesting. > > > > > > Thanks, > > > > > > Diab > > > > > > (See also https://rt.cpan.org/Ticket/Display.html?id=90317)
> > > > I found I had the same problem when trying to create a fatpacked > > cpanp. > > > > CPANPLUS uses Module::Pluggable and the fatpacked cpanp couldn't load > > fatpacked CPANPLUS plugins. > > > > My efforts are in the CPANPLUS repository if anyone is interested. > > > > https://github.com/jib/cpanplus-devel/blob/master/dev- > > bin/fatpack.pl#L96 > > > > https://github.com/jib/cpanplus-devel/blob/master/dev-bin/Module- > > Pluggable.patch
> > I don't use Module::Pluggable, but I've had to deal with the same > problem. I ended up using a similar solution: > > https://github.com/haarg/App-BCSSH/blob/master/maint/pack#L129
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On Thu Nov 14 07:00:17 2013, SIMONW wrote: Show quoted text
> I got a prototype working by looking for the presence of > %main::fatpacked but that's obviously not a great longterm solution. > >
Ok, here are my takes on this: https://github.com/djerius/App-FatPacker/commit/e7051d24e8b8cc6556d3e2fcdaf00a1348e4a791 https://github.com/djerius/Module-Pluggable/commit/a92be511035f6479fe5d8ff93277060150ac8e4e It shoves an object into @INC rather than a subroutine ref. I prefer this solution as it's based upon behavior (whether the @INC hook provides a method) rather than by name. That way we can define an API and it'll be completely independent of knowing who is doing what.
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On Fri Nov 15 12:36:46 2013, DJERIUS wrote: Show quoted text
> On Thu Nov 14 07:00:17 2013, SIMONW wrote:
> > I got a prototype working by looking for the presence of > > %main::fatpacked but that's obviously not a great longterm solution. > > > >
> > Ok, here are my takes on this: > > https://github.com/djerius/App- > FatPacker/commit/e7051d24e8b8cc6556d3e2fcdaf00a1348e4a791 > > https://github.com/djerius/Module- > Pluggable/commit/a92be511035f6479fe5d8ff93277060150ac8e4e > > It shoves an object into @INC rather than a subroutine ref. > > I prefer this solution as it's based upon behavior (whether the @INC > hook provides a method) rather than by name. > > That way we can define an API and it'll be completely independent of > knowing who is doing what.
This will need some slight adjustment to work in perl 5.6. It should just be a matter of moving the version check inside the INC sub, returning the sub rather than the filehandle.
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On Fri Nov 15 13:03:55 2013, haarg wrote: Show quoted text
> On Fri Nov 15 12:36:46 2013, DJERIUS wrote:
> > On Thu Nov 14 07:00:17 2013, SIMONW wrote:
> > > I got a prototype working by looking for the presence of > > > %main::fatpacked but that's obviously not a great longterm > > > solution. > > > > > >
> > > > Ok, here are my takes on this: > > > > https://github.com/djerius/App- > > FatPacker/commit/e7051d24e8b8cc6556d3e2fcdaf00a1348e4a791 > > > > https://github.com/djerius/Module- > > Pluggable/commit/a92be511035f6479fe5d8ff93277060150ac8e4e > > > > It shoves an object into @INC rather than a subroutine ref. > > > > I prefer this solution as it's based upon behavior (whether the @INC > > hook provides a method) rather than by name. > > > > That way we can define an API and it'll be completely independent of > > knowing who is doing what.
> > This will need some slight adjustment to work in perl 5.6. It should > just be a matter of moving the version check inside the INC sub, > returning the sub rather than the filehandle.
Is there some subtlety I'm missing? We already know which version of perl is running prior to defining the INC sub; the code returns a sub if $] < 5.008, the object otherwise. So < 5.008 can never see a filehandle. If the object is in play, we already know we're >= 5.008, so it can return the filehandle. Or...?
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On Fri Nov 15 13:51:11 2013, DJERIUS wrote: Show quoted text
> On Fri Nov 15 13:03:55 2013, haarg wrote:
> > On Fri Nov 15 12:36:46 2013, DJERIUS wrote:
> > > On Thu Nov 14 07:00:17 2013, SIMONW wrote:
> > > > I got a prototype working by looking for the presence of > > > > %main::fatpacked but that's obviously not a great longterm > > > > solution. > > > > > > > >
> > > > > > Ok, here are my takes on this: > > > > > > https://github.com/djerius/App- > > > FatPacker/commit/e7051d24e8b8cc6556d3e2fcdaf00a1348e4a791 > > > > > > https://github.com/djerius/Module- > > > Pluggable/commit/a92be511035f6479fe5d8ff93277060150ac8e4e > > > > > > It shoves an object into @INC rather than a subroutine ref. > > > > > > I prefer this solution as it's based upon behavior (whether the > > > @INC > > > hook provides a method) rather than by name. > > > > > > That way we can define an API and it'll be completely independent > > > of > > > knowing who is doing what.
> > > > This will need some slight adjustment to work in perl 5.6. It should > > just be a matter of moving the version check inside the INC sub, > > returning the sub rather than the filehandle.
> > Is there some subtlety I'm missing? We already know which version of > perl is running prior to defining the INC sub; the code returns a sub > if $] < 5.008, the object otherwise. So < 5.008 can never see a > filehandle. If the object is in play, we already know we're >= 5.008, > so it can return the filehandle. > > Or...?
The 5.6 code should also use an object. The only difference should be in what is returned from the INC sub.
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On Fri Nov 15 15:02:56 2013, haarg wrote: Show quoted text
> On Fri Nov 15 13:51:11 2013, DJERIUS wrote:
> > On Fri Nov 15 13:03:55 2013, haarg wrote:
> > > On Fri Nov 15 12:36:46 2013, DJERIUS wrote:
> > > > On Thu Nov 14 07:00:17 2013, SIMONW wrote:
> > > > > I got a prototype working by looking for the presence of > > > > > %main::fatpacked but that's obviously not a great longterm > > > > > solution. > > > > > > > > > >
> > > > > > > > Ok, here are my takes on this: > > > > > > > > https://github.com/djerius/App- > > > > FatPacker/commit/e7051d24e8b8cc6556d3e2fcdaf00a1348e4a791 > > > > > > > > https://github.com/djerius/Module- > > > > Pluggable/commit/a92be511035f6479fe5d8ff93277060150ac8e4e > > > > > > > > It shoves an object into @INC rather than a subroutine ref. > > > > > > > > I prefer this solution as it's based upon behavior (whether the > > > > @INC > > > > hook provides a method) rather than by name. > > > > > > > > That way we can define an API and it'll be completely independent > > > > of > > > > knowing who is doing what.
> > > > > > This will need some slight adjustment to work in perl 5.6. It > > > should > > > just be a matter of moving the version check inside the INC sub, > > > returning the sub rather than the filehandle.
> > > > Is there some subtlety I'm missing? We already know which version of > > perl is running prior to defining the INC sub; the code returns a sub > > if $] < 5.008, the object otherwise. So < 5.008 can never see a > > filehandle. If the object is in play, we already know we're >= > > 5.008, > > so it can return the filehandle. > > > > Or...?
> > The 5.6 code should also use an object. The only difference should be > in what is returned from the INC sub.
I'm obviously not up on my Perl archeology. Digging through the docs for require I find this: 5.6: no mention of INC hooks http://search.cpan.org/~gsar/perl-5.6.1/pod/perlfunc.pod#require 5.8: hooks may be sub, array, or object. first level sub must return undef or filehandle http://search.cpan.org/~jhi/perl-5.8.0/pod/perlfunc.pod#require 5.10+: hooks may be sub, array, or object. first level sub returns filehandle or sub or nothing http://search.cpan.org/~dapm/perl-5.10.1/pod/perlfunc.pod#require Your statement and the original code suggest the docs for 5.6 are incomplete, and should be 5.6: hook may be sub or object. first level sub returns sub or undef but not filehandle That would imply that 5.8 swapped the sub for a filehandle (or that its docs are wrong) and that 5.10 reintroduced the sub. I'm confused.
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On Fri Nov 15 15:51:10 2013, DJERIUS wrote: Show quoted text
> On Fri Nov 15 15:02:56 2013, haarg wrote:
> > On Fri Nov 15 13:51:11 2013, DJERIUS wrote:
> > > On Fri Nov 15 13:03:55 2013, haarg wrote:
> > > > On Fri Nov 15 12:36:46 2013, DJERIUS wrote:
> > > > > On Thu Nov 14 07:00:17 2013, SIMONW wrote:
> > > > > > I got a prototype working by looking for the presence of > > > > > > %main::fatpacked but that's obviously not a great longterm > > > > > > solution. > > > > > > > > > > > >
> > > > > > > > > > Ok, here are my takes on this: > > > > > > > > > > https://github.com/djerius/App- > > > > > FatPacker/commit/e7051d24e8b8cc6556d3e2fcdaf00a1348e4a791 > > > > > > > > > > https://github.com/djerius/Module- > > > > > Pluggable/commit/a92be511035f6479fe5d8ff93277060150ac8e4e > > > > > > > > > > It shoves an object into @INC rather than a subroutine ref. > > > > > > > > > > I prefer this solution as it's based upon behavior (whether the > > > > > @INC > > > > > hook provides a method) rather than by name. > > > > > > > > > > That way we can define an API and it'll be completely > > > > > independent > > > > > of > > > > > knowing who is doing what.
> > > > > > > > This will need some slight adjustment to work in perl 5.6. It > > > > should > > > > just be a matter of moving the version check inside the INC sub, > > > > returning the sub rather than the filehandle.
> > > > > > Is there some subtlety I'm missing? We already know which version > > > of > > > perl is running prior to defining the INC sub; the code returns a > > > sub > > > if $] < 5.008, the object otherwise. So < 5.008 can never see a > > > filehandle. If the object is in play, we already know we're >= > > > 5.008, > > > so it can return the filehandle. > > > > > > Or...?
> > > > The 5.6 code should also use an object. The only difference should > > be > > in what is returned from the INC sub.
> > I'm obviously not up on my Perl archeology. > > Digging through the docs for require I find this: > > 5.6: no mention of INC hooks > http://search.cpan.org/~gsar/perl-5.6.1/pod/perlfunc.pod#require > > 5.8: hooks may be sub, array, or object. first level sub must return > undef or filehandle > http://search.cpan.org/~jhi/perl-5.8.0/pod/perlfunc.pod#require > > 5.10+: hooks may be sub, array, or object. first level sub returns > filehandle or sub or nothing > http://search.cpan.org/~dapm/perl-5.10.1/pod/perlfunc.pod#require > > Your statement and the original code suggest the docs for 5.6 are > incomplete, and should be > > 5.6: hook may be sub or object. first level sub returns sub or undef > but not filehandle > > That would imply that 5.8 swapped the sub for a filehandle (or that > its docs are wrong) and that > 5.10 reintroduced the sub. > > I'm confused.
The docs are incomplete. From perl 5.6 forward, objects, subs, and arrayrefs are all supported. The only difference is that perl 5.6 doesn't have PerlIO, so you can't open a filehandle to an in memory string. It uses an alternate form for the hook return value to work around that.
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On Fri Nov 15 15:59:34 2013, haarg wrote: Show quoted text
> On Fri Nov 15 15:51:10 2013, DJERIUS wrote:
> > On Fri Nov 15 15:02:56 2013, haarg wrote:
> > > On Fri Nov 15 13:51:11 2013, DJERIUS wrote:
> > > > On Fri Nov 15 13:03:55 2013, haarg wrote:
> > > > > On Fri Nov 15 12:36:46 2013, DJERIUS wrote:
> > > > > > On Thu Nov 14 07:00:17 2013, SIMONW wrote:
> > > > > > > I got a prototype working by looking for the presence of > > > > > > > %main::fatpacked but that's obviously not a great longterm > > > > > > > solution. > > > > > > > > > > > > > >
> > > > > > > > > > > > Ok, here are my takes on this: > > > > > > > > > > > > https://github.com/djerius/App- > > > > > > FatPacker/commit/e7051d24e8b8cc6556d3e2fcdaf00a1348e4a791 > > > > > > > > > > > > https://github.com/djerius/Module- > > > > > > Pluggable/commit/a92be511035f6479fe5d8ff93277060150ac8e4e > > > > > > > > > > > > It shoves an object into @INC rather than a subroutine ref. > > > > > > > > > > > > I prefer this solution as it's based upon behavior (whether > > > > > > the > > > > > > @INC > > > > > > hook provides a method) rather than by name. > > > > > > > > > > > > That way we can define an API and it'll be completely > > > > > > independent > > > > > > of > > > > > > knowing who is doing what.
> > > > > > > > > > This will need some slight adjustment to work in perl 5.6. It > > > > > should > > > > > just be a matter of moving the version check inside the INC > > > > > sub, > > > > > returning the sub rather than the filehandle.
> > > > > > > > Is there some subtlety I'm missing? We already know which > > > > version > > > > of > > > > perl is running prior to defining the INC sub; the code returns a > > > > sub > > > > if $] < 5.008, the object otherwise. So < 5.008 can never see a > > > > filehandle. If the object is in play, we already know we're >= > > > > 5.008, > > > > so it can return the filehandle. > > > > > > > > Or...?
> > > > > > The 5.6 code should also use an object. The only difference should > > > be > > > in what is returned from the INC sub.
> > > > I'm obviously not up on my Perl archeology. > > > > Digging through the docs for require I find this: > > > > 5.6: no mention of INC hooks > > http://search.cpan.org/~gsar/perl-5.6.1/pod/perlfunc.pod#require > > > > 5.8: hooks may be sub, array, or object. first level sub must return > > undef or filehandle > > http://search.cpan.org/~jhi/perl-5.8.0/pod/perlfunc.pod#require > > > > 5.10+: hooks may be sub, array, or object. first level sub returns > > filehandle or sub or nothing > > http://search.cpan.org/~dapm/perl-5.10.1/pod/perlfunc.pod#require > > > > Your statement and the original code suggest the docs for 5.6 are > > incomplete, and should be > > > > 5.6: hook may be sub or object. first level sub returns sub or undef > > but not filehandle > > > > That would imply that 5.8 swapped the sub for a filehandle (or that > > its docs are wrong) and that > > 5.10 reintroduced the sub. > > > > I'm confused.
> > The docs are incomplete. From perl 5.6 forward, objects, subs, and > arrayrefs are all supported. The only difference is that perl 5.6 > doesn't have PerlIO, so you can't open a filehandle to an in memory > string. It uses an alternate form for the hook return value to work > around that.
Ok. I'll code to that. Thanks for the clarification.
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On Fri Nov 15 16:01:02 2013, DJERIUS wrote: Show quoted text
> On Fri Nov 15 15:59:34 2013, haarg wrote:
Show quoted text
> > The docs are incomplete. From perl 5.6 forward, objects, subs, and > > arrayrefs are all supported. The only difference is that perl 5.6 > > doesn't have PerlIO, so you can't open a filehandle to an in memory > > string. It uses an alternate form for the hook return value to work > > around that.
> > Ok. I'll code to that. Thanks for the clarification.
I've implemented that approach, added a test, and tested the code under Perls 5.6.2, 5.8.9, 5.10.1, 5.16.2 and 5.18.0 (via the FATPACKER_TESTWITH hook in pack.t). All may be found here: https://github.com/djerius/App-FatPacker
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On Sat Nov 16 21:43:35 2013, DJERIUS wrote: Show quoted text
> On Fri Nov 15 16:01:02 2013, DJERIUS wrote:
> > On Fri Nov 15 15:59:34 2013, haarg wrote:
>
> > > The docs are incomplete. From perl 5.6 forward, objects, subs, and > > > arrayrefs are all supported. The only difference is that perl 5.6 > > > doesn't have PerlIO, so you can't open a filehandle to an in memory > > > string. It uses an alternate form for the hook return value to > > > work > > > around that.
> > > > Ok. I'll code to that. Thanks for the clarification.
> > > I've implemented that approach, added a test, and tested the code > under Perls > > 5.6.2, 5.8.9, 5.10.1, 5.16.2 and 5.18.0 > > (via the FATPACKER_TESTWITH hook in pack.t). > > All may be found here: https://github.com/djerius/App-FatPacker
I've merged this, with a few tweaks. I'll put out a new release pretty soon.
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