Makefile: require index.md

[maxim-belkin]

index.md is required for building websites of The Carpentries' lessons, so this PR adds index.md as a new target and makes it a requirement for site and serve targets.

Extracted from carpentries/styles#495

Output before

``` $ make site bundle config set --local path .vendor/bundle && bundle install && bundle update && bundle exec jekyll build Using concurrent-ruby 1.1.9 Using i18n 0.9.5 Using minitest 5.14.4 Using thread_safe 0.3.6 Using tzinfo 1.2.9 Using zeitwerk 2.4.2 Using activesupport 6.0.4 Using public_suffix 4.0.6 Using addressable 2.7.0 Using bundler 2.1.4 Using coffee-script-source 1.11.1 Using execjs 2.8.1 Using coffee-script 2.4.1 Using colorator 1.1.0 Using ruby-enum 0.9.0 Using commonmarker 0.17.13 Using unf_ext 0.0.7.7 Using unf 0.1.4 Using simpleidn 0.2.1 Using dnsruby 1.61.5 Using eventmachine 1.2.7 Using http_parser.rb 0.6.0 Using em-websocket 0.5.2 Using ffi 1.15.3 Using ethon 0.14.0 Using faraday-em_http 1.0.0 Using faraday-em_synchrony 1.0.0 Using faraday-excon 1.1.0 Using faraday-net_http 1.0.1 Using faraday-net_http_persistent 1.1.0 Using multipart-post 2.1.1 Using ruby2_keywords 0.0.4 Using faraday 1.4.2 Using forwardable-extended 2.6.0 Using gemoji 3.0.1 Using sawyer 0.8.2 Using octokit 4.21.0 Using typhoeus 1.4.0 Using github-pages-health-check 1.17.2 Using rb-fsevent 0.11.0 Using rb-inotify 0.10.1 Using sass-listen 4.0.0 Using sass 3.7.4 Using jekyll-sass-converter 1.5.2 Using listen 3.5.1 Using jekyll-watch 2.2.1 Using rexml 3.2.5 Using kramdown 2.3.1 Using liquid 4.0.3 Using mercenary 0.3.6 Using pathutil 0.16.2 Using rouge 3.26.0 Using safe_yaml 1.0.5 Using jekyll 3.9.0 Using jekyll-avatar 0.7.0 Using jekyll-coffeescript 1.1.1 Using jekyll-commonmark 1.3.1 Using jekyll-commonmark-ghpages 0.1.6 Using jekyll-default-layout 0.1.4 Using jekyll-feed 0.15.1 Using jekyll-gist 1.5.0 Using jekyll-github-metadata 2.13.0 Using mini_portile2 2.5.3 Using racc 1.5.2 Using nokogiri 1.11.7 (x86_64-darwin) Using html-pipeline 2.14.0 Using jekyll-mentions 1.6.0 Using jekyll-optional-front-matter 0.3.2 Using jekyll-paginate 1.1.0 Using jekyll-readme-index 0.3.0 Using jekyll-redirect-from 0.16.0 Using jekyll-relative-links 0.6.1 Using rubyzip 2.3.0 Using jekyll-remote-theme 0.4.3 Using jekyll-seo-tag 2.7.1 Using jekyll-sitemap 1.4.0 Using jekyll-swiss 1.0.0 Using jekyll-theme-architect 0.1.1 Using jekyll-theme-cayman 0.1.1 Using jekyll-theme-dinky 0.1.1 Using jekyll-theme-hacker 0.1.2 Using jekyll-theme-leap-day 0.1.1 Using jekyll-theme-merlot 0.1.1 Using jekyll-theme-midnight 0.1.1 Using jekyll-theme-minimal 0.1.1 Using jekyll-theme-modernist 0.1.1 Using jekyll-theme-primer 0.5.4 Using jekyll-theme-slate 0.1.1 Using jekyll-theme-tactile 0.1.1 Using jekyll-theme-time-machine 0.1.1 Using jekyll-titles-from-headings 0.5.3 Using jemoji 0.12.0 Using kramdown-parser-gfm 1.1.0 Using minima 2.5.1 Using unicode-display_width 1.7.0 Using terminal-table 1.8.0 Using github-pages 215 Bundle complete! 1 Gemfile dependency, 97 gems now installed. Bundled gems are installed into `./.vendor/bundle` Fetching gem metadata from https://rubygems.org/........... Fetching gem metadata from https://rubygems.org/. Resolving dependencies.... Using concurrent-ruby 1.1.9 Using i18n 0.9.5 Using minitest 5.14.4 Using thread_safe 0.3.6 Using tzinfo 1.2.9 Using zeitwerk 2.4.2 Using activesupport 6.0.4 Using public_suffix 4.0.6 Using addressable 2.7.0 Using bundler 2.1.4 Using coffee-script-source 1.11.1 Using execjs 2.8.1 Using coffee-script 2.4.1 Using colorator 1.1.0 Using ruby-enum 0.9.0 Using commonmarker 0.17.13 Using unf_ext 0.0.7.7 Using unf 0.1.4 Using simpleidn 0.2.1 Fetching dnsruby 1.61.7 (was 1.61.5) Installing dnsruby 1.61.7 (was 1.61.5) Using eventmachine 1.2.7 Using http_parser.rb 0.6.0 Using em-websocket 0.5.2 Using ffi 1.15.3 Using ethon 0.14.0 Using faraday-em_http 1.0.0 Using faraday-em_synchrony 1.0.0 Using faraday-excon 1.1.0 Using faraday-net_http 1.0.1 Using faraday-net_http_persistent 1.1.0 Using multipart-post 2.1.1 Using ruby2_keywords 0.0.4 Using faraday 1.4.2 Using forwardable-extended 2.6.0 Using gemoji 3.0.1 Using sawyer 0.8.2 Using octokit 4.21.0 Using typhoeus 1.4.0 Using github-pages-health-check 1.17.2 Using rb-fsevent 0.11.0 Using rb-inotify 0.10.1 Using sass-listen 4.0.0 Using sass 3.7.4 Using jekyll-sass-converter 1.5.2 Using listen 3.5.1 Using jekyll-watch 2.2.1 Using rexml 3.2.5 Using kramdown 2.3.1 Using liquid 4.0.3 Using mercenary 0.3.6 Using pathutil 0.16.2 Using rouge 3.26.0 Using safe_yaml 1.0.5 Using jekyll 3.9.0 Using jekyll-avatar 0.7.0 Using jekyll-coffeescript 1.1.1 Using jekyll-commonmark 1.3.1 Using jekyll-commonmark-ghpages 0.1.6 Using jekyll-default-layout 0.1.4 Using jekyll-feed 0.15.1 Using jekyll-gist 1.5.0 Using jekyll-github-metadata 2.13.0 Using mini_portile2 2.5.3 Using racc 1.5.2 Using nokogiri 1.11.7 (x86_64-darwin) Using html-pipeline 2.14.0 Using jekyll-mentions 1.6.0 Using jekyll-optional-front-matter 0.3.2 Using jekyll-paginate 1.1.0 Using jekyll-readme-index 0.3.0 Using jekyll-redirect-from 0.16.0 Using jekyll-relative-links 0.6.1 Using rubyzip 2.3.0 Using jekyll-remote-theme 0.4.3 Using jekyll-seo-tag 2.7.1 Using jekyll-sitemap 1.4.0 Using jekyll-swiss 1.0.0 Using jekyll-theme-architect 0.1.1 Using jekyll-theme-cayman 0.1.1 Using jekyll-theme-dinky 0.1.1 Using jekyll-theme-hacker 0.1.2 Using jekyll-theme-leap-day 0.1.1 Using jekyll-theme-merlot 0.1.1 Using jekyll-theme-midnight 0.1.1 Using jekyll-theme-minimal 0.1.1 Using jekyll-theme-modernist 0.1.1 Using jekyll-theme-primer 0.5.4 Using jekyll-theme-slate 0.1.1 Using jekyll-theme-tactile 0.1.1 Using jekyll-theme-time-machine 0.1.1 Using jekyll-titles-from-headings 0.5.3 Using jemoji 0.12.0 Using kramdown-parser-gfm 1.1.0 Using minima 2.5.1 Using unicode-display_width 1.7.0 Using terminal-table 1.8.0 Using github-pages 215 Bundle updated! Post-install message from dnsruby: Installing dnsruby... For issues and source code: https://github.com/alexdalitz/dnsruby For general discussion (please tell us how you use dnsruby): https://groups.google.com/forum/#!forum/dnsruby Configuration file: /Users/mbelkin/git/swcarpentry/python-novice-inflammation/_config.yml Source: /Users/mbelkin/git/swcarpentry/python-novice-inflammation Destination: /Users/mbelkin/git/swcarpentry/python-novice-inflammation/_site Incremental build: disabled. Enable with --incremental Generating... Liquid Exception: Could not find document 'index.md' in tag 'link'. Make sure the document exists and the path is correct. in /Users/mbelkin/git/swcarpentry/python-novice-inflammation/_episodes/01-intro.md jekyll 3.9.0 | Error: Could not find document 'index.md' in tag 'link'. Make sure the document exists and the path is correct. Traceback (most recent call last): 63: from /Users/mbelkin/.rbenv/versions/2.7.1/bin/bundle:23:in `

' 62: from /Users/mbelkin/.rbenv/versions/2.7.1/bin/bundle:23:in `load' 61: from /Users/mbelkin/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/bundler-2.1.4/libexec/bundle:34:in `' 60: from /Users/mbelkin/.rbenv/versions/2.7.1/lib/ruby/2.7.0/bundler/friendly_errors.rb:123:in `with_friendly_errors' 59: from /Users/mbelkin/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/bundler-2.1.4/libexec/bundle:46:in `block in ' 58: from /Users/mbelkin/.rbenv/versions/2.7.1/lib/ruby/2.7.0/bundler/cli.rb:24:in `start' 57: from /Users/mbelkin/.rbenv/versions/2.7.1/lib/ruby/2.7.0/bundler/vendor/thor/lib/thor/base.rb:476:in `start' 56: from /Users/mbelkin/.rbenv/versions/2.7.1/lib/ruby/2.7.0/bundler/cli.rb:30:in `dispatch' 55: from /Users/mbelkin/.rbenv/versions/2.7.1/lib/ruby/2.7.0/bundler/vendor/thor/lib/thor.rb:399:in `dispatch' 54: from /Users/mbelkin/.rbenv/versions/2.7.1/lib/ruby/2.7.0/bundler/vendor/thor/lib/thor/invocation.rb:127:in `invoke_command' 53: from /Users/mbelkin/.rbenv/versions/2.7.1/lib/ruby/2.7.0/bundler/vendor/thor/lib/thor/command.rb:27:in `run' 52: from /Users/mbelkin/.rbenv/versions/2.7.1/lib/ruby/2.7.0/bundler/cli.rb:476:in `exec' 51: from /Users/mbelkin/.rbenv/versions/2.7.1/lib/ruby/2.7.0/bundler/cli/exec.rb:28:in `run' 50: from /Users/mbelkin/.rbenv/versions/2.7.1/lib/ruby/2.7.0/bundler/cli/exec.rb:63:in `kernel_load' 49: from /Users/mbelkin/.rbenv/versions/2.7.1/lib/ruby/2.7.0/bundler/cli/exec.rb:63:in `load' 48: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/bin/jekyll:23:in `' 47: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/bin/jekyll:23:in `load' 46: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/jekyll-3.9.0/exe/jekyll:15:in `' 45: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/mercenary-0.3.6/lib/mercenary.rb:19:in `program' 44: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/mercenary-0.3.6/lib/mercenary/program.rb:42:in `go' 43: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/mercenary-0.3.6/lib/mercenary/command.rb:220:in `execute' 42: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/mercenary-0.3.6/lib/mercenary/command.rb:220:in `each' 41: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/mercenary-0.3.6/lib/mercenary/command.rb:220:in `block in execute' 40: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/jekyll-3.9.0/lib/jekyll/commands/build.rb:18:in `block (2 levels) in init_with_program' 39: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/jekyll-3.9.0/lib/jekyll/commands/build.rb:36:in `process' 38: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/jekyll-3.9.0/lib/jekyll/commands/build.rb:65:in `build' 37: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/jekyll-3.9.0/lib/jekyll/command.rb:28:in `process_site' 36: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/jekyll-3.9.0/lib/jekyll/site.rb:71:in `process' 35: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/jekyll-3.9.0/lib/jekyll/site.rb:191:in `render' 34: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/jekyll-3.9.0/lib/jekyll/site.rb:462:in `render_docs' 33: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/jekyll-3.9.0/lib/jekyll/site.rb:462:in `each_value' 32: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/jekyll-3.9.0/lib/jekyll/site.rb:463:in `block in render_docs' 31: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/jekyll-3.9.0/lib/jekyll/site.rb:463:in `each' 30: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/jekyll-3.9.0/lib/jekyll/site.rb:464:in `block (2 levels) in render_docs' 29: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/jekyll-3.9.0/lib/jekyll/site.rb:479:in `render_regenerated' 28: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/jekyll-3.9.0/lib/jekyll/renderer.rb:62:in `run' 27: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/jekyll-3.9.0/lib/jekyll/renderer.rb:79:in `render_document' 26: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/jekyll-3.9.0/lib/jekyll/renderer.rb:126:in `render_liquid' 25: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/jekyll-3.9.0/lib/jekyll/liquid_renderer/file.rb:28:in `render!' 24: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/jekyll-3.9.0/lib/jekyll/liquid_renderer/file.rb:49:in `measure_time' 23: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/jekyll-3.9.0/lib/jekyll/liquid_renderer/file.rb:29:in `block in render!' 22: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/jekyll-3.9.0/lib/jekyll/liquid_renderer/file.rb:42:in `measure_bytes' 21: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/jekyll-3.9.0/lib/jekyll/liquid_renderer/file.rb:30:in `block (2 levels) in render!' 20: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/liquid-4.0.3/lib/liquid/template.rb:220:in `render!' 19: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/liquid-4.0.3/lib/liquid/template.rb:207:in `render' 18: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/liquid-4.0.3/lib/liquid/template.rb:242:in `with_profiling' 17: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/liquid-4.0.3/lib/liquid/template.rb:208:in `block in render' 16: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/liquid-4.0.3/lib/liquid/block_body.rb:91:in `render' 15: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/liquid-4.0.3/lib/liquid/block_body.rb:103:in `render_node_to_output' 14: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/jekyll-3.9.0/lib/jekyll/tags/include.rb:137:in `render' 13: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/liquid-4.0.3/lib/liquid/context.rb:123:in `stack' 12: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/jekyll-3.9.0/lib/jekyll/tags/include.rb:140:in `block in render' 11: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/jekyll-3.9.0/lib/jekyll/liquid_renderer/file.rb:28:in `render!' 10: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/jekyll-3.9.0/lib/jekyll/liquid_renderer/file.rb:49:in `measure_time' 9: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/jekyll-3.9.0/lib/jekyll/liquid_renderer/file.rb:29:in `block in render!' 8: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/jekyll-3.9.0/lib/jekyll/liquid_renderer/file.rb:42:in `measure_bytes' 7: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/jekyll-3.9.0/lib/jekyll/liquid_renderer/file.rb:30:in `block (2 levels) in render!' 6: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/liquid-4.0.3/lib/liquid/template.rb:220:in `render!' 5: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/liquid-4.0.3/lib/liquid/template.rb:207:in `render' 4: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/liquid-4.0.3/lib/liquid/template.rb:242:in `with_profiling' 3: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/liquid-4.0.3/lib/liquid/template.rb:208:in `block in render' 2: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/liquid-4.0.3/lib/liquid/block_body.rb:91:in `render' 1: from /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/liquid-4.0.3/lib/liquid/block_body.rb:103:in `render_node_to_output' /Users/mbelkin/git/swcarpentry/python-novice-inflammation/.vendor/bundle/ruby/2.7.0/gems/jekyll-3.9.0/lib/jekyll/tags/link.rb:27:in `render': Could not find document 'index.md' in tag 'link'. (ArgumentError) Make sure the document exists and the path is correct. make: *** [site] Error 1 ```

Output after

``` $ make site Makefile:184: *** index.md not found. Stop. ```

[fmichonneau]

Thanks for this Maxim!

[maxim-belkin]

Thanks for merging, François!