would it be possible to modify the build script to remove all packages that are not present in the cpanfile file or to update all packages that don't specify a version to the latest version?

I had an issue where after adding a new package my entire app broke and even reversing the associated commits didn't help because the added package remained somewhere. the only thing that worked was a rollback. to be able to commit new changes, I had to manually go through all dependencies in the cpanfile and specify a version for all of them in order to have cpanm install the latest versions of the packages. took me also a good while to figure out what was going on.

Currently this buildpack uses /usr/bin/perl which comes with the heroku image, and it's 5.10.1.

Would be nice to pre-build the list of supported perl binaries, host somewhere (Dropbox?) and download them to use. See other heroku buildpack like nodejs

To specify perl version to use, you can use either a) .perl-version of https://github.com/tokuhirom/plenv and b) requires 'perl', '== 5.12.3' in cpanfile.

Never mind. Please delete!

My fork of this, puts a default Catalyst app on IBM Blumix. For whatever that's worth!

I think I've followed the instructions exactly, but when I try to build I get the following error:

2017-09-21T14:35:34.267466Z app[web.1]: Can't locate Plack/Runner.pm in @INC (@INC contains: /usr/local/lib64/perl5 /usr/local/share/perl5 /usr/lib64/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib64/perl5 /usr/share/perl5 .) at /app/local/bin/starman line 3.
2017-09-21T14:35:34.267496Z app[web.1]: BEGIN failed--compilation aborted at /app/local/bin/starman line 3.

I have the cpanfile exactly as stated on the home page. I also tried it without versions, just in case. My procfile is just

web: starman

Any suggestions would be very appreciated. Let me know what other information you think might help.

The PATH variables created by the release scripts are different between the master and carton branches. One difference which is expected is the presence of /app/vendor/perl/bin only in the carton branch, since only that branch vendors Perl. The difference which is unexpected to me is that carton has /app/local/bin while master has only local/bin. Is that a typo in the master branch, since it doesn't even begin with a /?

Could you please include a basic example app.

Makes it easier for us new people.

Many thanks!

Sorry, I am not sure whether the problem is caused by settings of this build pack, but XML::LibXSLT fails to install as I have described in this question:

$ git init
$ echo 'requires "XML::LibXSLT";' > cpanfile
$ echo 'sub { [200,[], ['Hello World']] }' > app.psgi
$ git add cpanfile app.psgi
$ git commit -m "initial commit"
$ heroku create --stack cedar --buildpack https://github.com/miyagawa/heroku-buildpack-perl.git
$ git push heroku master

Despite Heroku having installed the required Ubuntu packages libgdbm3 and libxslt1-dev, compilation fails because gdbm cannot be found. Could this be cause by the PATH setting of this buildpack?

$ lwp-request -mHEAD -E https://raw.github.com/miyagawa/cpanminus/master/cpanm
HEAD https://raw.github.com/miyagawa/cpanminus/master/cpanm
User-Agent: lwp-request/6.03 libwww-perl/6.05

301 Moved Permanently
Connection: close
Date: Wed, 30 Apr 2014 09:51:40 GMT
Via: 1.1 varnish
Accept-Ranges: bytes
Age: 0
Location: https://raw.githubusercontent.com/miyagawa/cpanminus/master/cpanm
Server: Apache
Vary: Accept-Encoding
Client-Date: Wed, 30 Apr 2014 09:51:40 GMT
Client-Peer: 103.245.222.133:443
Client-Response-Num: 1
Client-SSL-Cert-Issuer: /C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert High Assurance CA-3
Client-SSL-Cert-Subject: /C=US/ST=California/L=San Francisco/O=Fastly, Inc./CN=www.github.com
Client-SSL-Cipher: RC4-SHA
Client-SSL-Socket-Class: IO::Socket::SSL
X-Cache: MISS
X-Cache-Hits: 0
X-Served-By: cache-ty68-TYO

HEAD https://raw.githubusercontent.com/miyagawa/cpanminus/master/cpanm
User-Agent: lwp-request/6.03 libwww-perl/6.05

200 OK

so, --location option is needed.

Heroku just started to support "Deploy to Heroku" Buttons: https://devcenter.heroku.com/articles/heroku-button It would be nice to document how to get this for your PSGI application.