Cookbook conflict causes infinite loop

[dkingofpa]

Using 0.0.25, I'm running librarian-chef install --verbose with this Cheffile. I'm getting a conflict with the mysql cookbook which appears to be causing an infinite loop. It just keeps checking the aws cookbook and then trying to resolve mysql. Here's a snippet of the output:

[Librarian] Checking manifests
[Librarian] Checking aws/0.100.2 <http://community.opscode.com/api/v1>
[Librarian] Resolving mysql (>= 1.3.0) <git://github.com/xforty/chef-mysql.git#xforty>
[Librarian] Conflicts with mysql/1.2.4 <git://github.com/xforty/chef-mysql.git#xforty>
[Librarian] Backtracking from aws/0.100.2 <http://community.opscode.com/api/v1>
[Librarian] Checking aws/0.100.0 <http://community.opscode.com/api/v1>
[Librarian] Resolving mysql (>= 1.3.0) <git://github.com/xforty/chef-mysql.git#xforty>
[Librarian] Conflicts with mysql/1.2.4 <git://github.com/xforty/chef-mysql.git#xforty>
[Librarian] Backtracking from aws/0.100.0 <http://community.opscode.com/api/v1>
[Librarian] Checking aws/0.99.1 <http://community.opscode.com/api/v1>
[Librarian] Resolving mysql (>= 1.3.0) <git://github.com/xforty/chef-mysql.git#xforty>
[Librarian] Conflicts with mysql/1.2.4 <git://github.com/xforty/chef-mysql.git#xforty>
[Librarian] Backtracking from aws/0.99.1 <http://community.opscode.com/api/v1>
[Librarian] Checking aws/0.99.0 <http://community.opscode.com/api/v1>
[Librarian] Resolving mysql (>= 1.3.0) <git://github.com/xforty/chef-mysql.git#xforty>
[Librarian] Conflicts with mysql/1.2.4 <git://github.com/xforty/chef-mysql.git#xforty>
[Librarian] Backtracking from aws/0.99.0 <http://community.opscode.com/api/v1>
[Librarian] Checking aws/0.10.1 <http://community.opscode.com/api/v1>
[Librarian] Resolving mysql (>= 1.3.0) <git://github.com/xforty/chef-mysql.git#xforty>
[Librarian] Conflicts with mysql/1.2.4 <git://github.com/xforty/chef-mysql.git#xforty>
[Librarian] Backtracking from aws/0.10.1 <http://community.opscode.com/api/v1>
[Librarian] Checking aws/0.10.0 <http://community.opscode.com/api/v1>
[Librarian] Resolving mysql (>= 1.3.0) <git://github.com/xforty/chef-mysql.git#xforty>
[Librarian] Conflicts with mysql/1.2.4 <git://github.com/xforty/chef-mysql.git#xforty>
[Librarian] Backtracking from aws/0.10.0 <http://community.opscode.com/api/v1>
[Librarian] Checking aws/0.9.0 <http://community.opscode.com/api/v1>
[Librarian] Resolving mysql (>= 1.3.0) <git://github.com/xforty/chef-mysql.git#xforty>
[Librarian] Conflicts with mysql/1.2.4 <git://github.com/xforty/chef-mysql.git#xforty>
[Librarian] Backtracking from aws/0.9.0 <http://community.opscode.com/api/v1>
[Librarian] Failed to resolve aws (>= 0.0.0) <#<Librarian::Resolver::Implementation::MultiSource:0x007fa4a292d5f8>>
[Librarian] Backtracking from xml/1.0.4 <http://community.opscode.com/api/v1>
[Librarian] Checking xml/1.0.2 <http://community.opscode.com/api/v1>
[Librarian] Resolving aws (>= 0.0.0) <#<Librarian::Resolver::Implementation::MultiSource:0x007fa4a292d5f8>>
[Librarian] No known prior constraints
[Librarian] Checking manifests
[Librarian] Checking aws/0.100.2 <http://community.opscode.com/api/v1>
[Librarian] Resolving mysql (>= 1.3.0) <git://github.com/xforty/chef-mysql.git#xforty>
[Librarian] Conflicts with mysql/1.2.4 <git://github.com/xforty/chef-mysql.git#xforty>
[Librarian] Backtracking from aws/0.100.2 <http://community.opscode.com/api/v1>
[Librarian] Checking aws/0.100.0 <http://community.opscode.com/api/v1>
[Librarian] Resolving mysql (>= 1.3.0) <git://github.com/xforty/chef-mysql.git#xforty>
[Librarian] Conflicts with mysql/1.2.4 <git://github.com/xforty/chef-mysql.git#xforty>
[Librarian] Backtracking from aws/0.100.0 <http://community.opscode.com/api/v1>
[Librarian] Checking aws/0.99.1 <http://community.opscode.com/api/v1>
[Librarian] Resolving mysql (>= 1.3.0) <git://github.com/xforty/chef-mysql.git#xforty>
[Librarian] Conflicts with mysql/1.2.4 <git://github.com/xforty/chef-mysql.git#xforty>
[Librarian] Backtracking from aws/0.99.1 <http://community.opscode.com/api/v1>
[Librarian] Checking aws/0.99.0 <http://community.opscode.com/api/v1>
[Librarian] Resolving mysql (>= 1.3.0) <git://github.com/xforty/chef-mysql.git#xforty>
[Librarian] Conflicts with mysql/1.2.4 <git://github.com/xforty/chef-mysql.git#xforty>
[Librarian] Backtracking from aws/0.99.0 <http://community.opscode.com/api/v1>
[Librarian] Checking aws/0.10.1 <http://community.opscode.com/api/v1>

[yfeldblum]

It appears to be the resolver trying all possible combinations of all cookbooks in order, looking for a consistent resolution (yes we can improve this). You may want to find out what's depending on mysql >= 1.3.0 though, or use a mysql cookbook marked as 1.3.0 or higher.

[dkingofpa]

Librarian was running for over ten minutes so I had to ctrl-c it. As soon as it finds a cookbook conflict, perhaps it can just fail fast?

Opscode's database cookbook bumped it's mysql cookbook dependency to >= 1.3.0. I resolved that issue and librarian ran fine.

[yfeldblum]

I would like to improve the dependency resolver. But for now, glad to hear you've worked around it.

[yfeldblum]

I've made some changes to the resolver. If you can still reproduce the problem with librarian-v0.0.25, mind giving it a try with master >= 0019611?

[dkingofpa]

Sure, I'm still able to reproduce the issue with an older version of my project and librarian-v0.0.25:

git clone git@github.com:xforty/vagrant-drupal.git
cd vagrant-drupal
git checkout 0.4.0
rm Cheffile.lock
librarian-chef install --verbose

Problem reproduced...keeps trying all possible cookbook combinations.

I then cloned librarian's master branch (HEAD currently at SHA 34eaa6b4ed) and ran it using the instructions from your readme:

rm -rf tmp
git clone git://github.com/applicationsonline/librarian.git
librarian/bin/librarian-chef install --verbose

Appears like that fixed it. Here's the output: https://gist.github.com/4159026

[yfeldblum]

Fantastic. Thanks!