|  | @@ -125,13 +125,16 @@ addons:
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				|  |  |        - libseccomp-dev
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				|  |  |        ## zstd doesn't exist in Ubuntu Trusty
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				|  |  |        #- libzstd
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				|  |  | +      - shellcheck
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				|  |  |        ## Conditional build dependencies
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				|  |  |        ## Always installed, so we don't need sudo
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				|  |  |        - asciidoc
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				|  |  |        - docbook-xsl
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				|  |  |        - docbook-xml
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				|  |  |        - xmlto
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				|  |  | -      - shellcheck
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				|  |  | +      ## Utilities
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				|  |  | +      ## preventing or diagnosing hangs
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				|  |  | +      - timelimit
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				|  |  |    ## (OSX only)
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				|  |  |    homebrew:
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				|  |  |      packages:
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				|  | @@ -151,11 +154,14 @@ addons:
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				|  |  |        - pkg-config
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				|  |  |        ## Optional build dependencies
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				|  |  |        - ccache
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				|  |  | +      - shellcheck
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				|  |  |        ## Conditional build dependencies
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				|  |  |        ## Always installed, because manual brew installs are hard to get right
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				|  |  |        - asciidoc
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				|  |  |        - xmlto
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				|  |  | -      - shellcheck
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				|  |  | +      ## Utilities
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				|  |  | +      ## preventing or diagnosing hangs
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				|  |  | +      - timelimit
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				|  |  |  
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				|  |  |  ## (OSX only) Use the default OSX image
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				|  |  |  ## See https://docs.travis-ci.com/user/reference/osx#os-x-version
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				|  | @@ -207,7 +213,8 @@ script:
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				|  |  |    - ./configure $CONFIGURE_FLAGS
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				|  |  |    ## We run `make check` because that's what https://jenkins.torproject.org does.
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				|  |  |    - if [[ "$DISTCHECK" == "" && "$TEST_STEM" == "" ]]; then make check; fi
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				|  |  | -  - if [[ "$TEST_STEM" != "" ]]; then make src/app/tor test-stem; fi
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				|  |  | +  ## Diagnostic for bug 29437: kill stem if it hangs for 15 minutes
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				|  |  | +  - if [[ "$TEST_STEM" != "" ]]; then timelimit -p -t 540 -T 30 make src/app/tor test-stem; fi
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				|  |  |    - if [[ "$DISTCHECK" != "" && "$TEST_STEM" == "" ]]; then make distcheck DISTCHECK_CONFIGURE_FLAGS="$CONFIGURE_FLAGS"; fi
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				|  |  |  
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				|  |  |  after_failure:
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