[ruby/psych] Improve libyaml source downloading error messages
People trying to build CRuby by following the instructions in its
[README] have been running into [errors] due to missing `libyaml`
on their system. Let's try to present a better error message when
it happens.
[README]: fb5aa31e2d (how-to-compile-and-install)
[errors]: https://github.com/ruby/psych/issues/552
https://github.com/ruby/psych/commit/20a633028e
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@ -19,10 +19,16 @@ if yaml_source == true
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# search the latest libyaml source under $srcdir
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yaml_source = Dir.glob("#{$srcdir}/yaml{,-*}/").max_by {|n| File.basename(n).scan(/\d+/).map(&:to_i)}
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unless yaml_source
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require_relative '../../tool/extlibs.rb'
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extlibs = ExtLibs.new(cache_dir: File.expand_path("../../tmp/download_cache", $srcdir))
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unless extlibs.process_under($srcdir)
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raise "failed to download libyaml source"
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download_failure = "failed to download libyaml source"
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begin
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require_relative '../../tool/extlibs.rb'
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extlibs = ExtLibs.new(cache_dir: File.expand_path("../../tmp/download_cache", $srcdir))
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unless extlibs.process_under($srcdir)
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raise download_failure
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end
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rescue
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# Implicitly captures Exception#cause. Newer rubies show it in the backtrace.
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raise download_failure
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end
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yaml_source, = Dir.glob("#{$srcdir}/yaml-*/")
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raise "libyaml not found" unless yaml_source
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