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  • # Copyright 2019 PrivateStorage.io, LLC
    #
    # Licensed under the Apache License, Version 2.0 (the "License");
    # you may not use this file except in compliance with the License.
    # You may obtain a copy of the License at
    #
    #     http://www.apache.org/licenses/LICENSE-2.0
    #
    # Unless required by applicable law or agreed to in writing, software
    # distributed under the License is distributed on an "AS IS" BASIS,
    # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    # See the License for the specific language governing permissions and
    # limitations under the License.
    
    
    version: 2.1
    
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          # Run in a highly Nix-capable environment.  This lets us use Stack's nix
          # integration and other useful Nix features to specify and run the
          # build.
    
          - image: "nixorg/nix:circleci"
    
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          # Specify a revision of NixOS/nixpkgs to run against.  This essentially
          # pins the majority of the software involved in the build.  This
          # revision is selected arbitrarily.  It's somewhat current as of the
          # time of this comment.  We can bump it to a newer version when that
          # makes sense.  Meanwhile, the platform won't shift around beneath us
          # unexpectedly.
    
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          NIXPKGS_REV: "8bf142e001b6876b021c8ee90c2c7cec385fe8e9"
    
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              # Get NIX_PATH set for the rest of the job so that the revision of
              # nixpkgs we selected will be used everywhere Nix pulls in software.
              # There is no way to set an environment variable containing the
              # value of another environment variable on CircleCI except to use
              # the `BASE_ENV` feature as we do here.
    
              name: "Setup NIX_PATH Environment Variable"
              command: |
    
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                echo "export NIX_PATH=nixpkgs=https://github.com/NixOS/nixpkgs/archive/$NIXPKGS_REV.tar.gz" >> $BASH_ENV
    
              # CircleCI won't let us interpolate NIXPKGS_REV into a cache key.
              # Only CircleCI's own environment variables or variables set via the
              # web interface in a "context" can be interpolated into cache keys.
              # However, we can interpolate the checksum of a file...  Since we
              # don't care about the exact revision, we just care that a new
              # revision gives us a new string, we can write the revision to a
              # file and then put the checksum of that file into the cache key.
              # This way, we don't have to maintain the nixpkgs revision in two
              # places and risk having them desynchronize.
    
              name: "Prepare For Cache Key"
              command: |
                echo "${NIXPKGS_REV}" > nixpkgs.rev
    
    
          - restore_cache:
    
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              # Get all of Nix's state relating to the particular revision of
              # nixpkgs we're using.  It will always be the same.  CircleCI
              # artifacts and nixpkgs store objects are probably mostly hosted in
              # the same place (S3) so there's not a lot of difference for
              # anything that's pre-built.  For anything we end up building
              # ourselves, though, this saves us all of the build time (less the
              # download time).
              #
              # Read about caching dependencies: https://circleci.com/docs/2.0/caching/
    
              name: "Restore Nix Store Paths"
              keys:
    
                # Construct cache keys that allow sharing as long as nixpkgs and
                # the Ristretto library are the same.
    
                # If the Ristretto library changes, we have to rebuild it so we
                # may as well throw away the part of the cache with the old build
                # and make a new one with the new build so we don't have to
                # rebuild it *again* next time.
                #
                # If nixpkgs changes then potentially a lot of cached packages for
                # the base system will be invalidated so we may as well drop them
                # and make a new cache with the new packages.
    
                - paymentserver-nix-store-v1-{{ checksum "nixpkgs.rev" }}-{{ checksum "ristretto.nix" }}
                - paymentserver-nix-store-v1-{{ checksum "nixpkgs.rev" }}-
    
                - paymentserver-nix-store-v1-
    
    
          - restore_cache:
    
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              # Restore the cache of Stack's state.  This will have all of the
              # compiled Haskell libraries we depend on and even the compiled
              # output of our own libraries, if the source hasn't changed since
              # the cache was written (but usually it will have).
    
              name: "Restore Cached Dependencies"
              keys:
                - paymentserver-v1-{{ checksum "stack.yaml" }}-{{ checksum "PaymentServer.cabal" }}
                - paymentserver-v1-{{ checksum "stack.yaml" }}
    
    
              # Build just our dependencies.  It's nice to have this as a separate
              # step so failures here are more easily identified as being
              # unrelated to our code.
    
              #
              # See below for explanation of the various flags passed in.  If the
              # flags here differ from those below in a way that makes ghc think a
              # library needs to be rebuilt then we'll build everything twice and
              # our cache will be useless!  Try not to make that happen.
    
              name: "Build Dependencies"
              command: |
    
                BUILD="stack build \
                --no-terminal \
                --only-dependencies \
    
                --interleaved-output"
                nix-shell shell.nix --run "$BUILD"
    
    
              # Give it a good long while.  stripe-core, in particular, can take a
              # while to build.
              no_output_timeout: "20m"
    
    
          - save_cache:
              # We can save the stack cache right here.  It will have everything
              # we want in it now that the dependencies have been built.  And this
              # way we get to save the cache whether or not the test suite goes on
              # to succeed.
              name: "Cache Dependencies"
              key: paymentserver-v1-{{ checksum "stack.yaml" }}-{{ checksum "PaymentServer.cabal" }}
              paths:
                - "/root/.stack"
                - ".stack-work"
    
    
              name: "Building"
    
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                # shell.nix gives us the stack we want.  Then stack.yaml specifies
                # some more of the Nix-based environment to be able to build and
                # run the tests.
                #
                # --no-terminal avoids having fancy progress reports written to
                # stdout.
                #
    
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                # --haddock builds the Haskell API documentation.
                # --haddock-internal builds docs even for unexposed modules.
                # --no-haddock-deps skips building docs for all our dependencies.
                BUILD="stack build \
                  --no-terminal \
                  --haddock \
                  --haddock-internal \
                  --no-haddock-deps"
                nix-shell shell.nix --run "$BUILD"
    
          - save_cache:
              name: "Cache Nix Store Paths"
    
              key: paymentserver-nix-store-v1-{{ checksum "nixpkgs.rev" }}-{{ checksum "ristretto.nix" }}
    
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              # There may be useful build logs here.
    
              name: "Prepare Artifacts for Upload"
    
                # The flags passed to `stack path` need to pretty closely match
                # those passed to `stack build` or the path comes out wrong.
    
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                # https://github.com/commercialhaskell/stack/issues/4892
    
                GETPATH="stack path \
    
                  --haddock \
                  --haddock-internal \
                  --no-haddock-deps"
    
                mv $(nix-shell shell.nix --run "$GETPATH")/PaymentServer-* /tmp/PaymentServer-docs
    
          - store_artifacts:
              # This contains the html haddock output for the project.
              path: "/tmp/PaymentServer-docs"
              destination: "docs"
    
    
    workflows:
      version: 2
      everything:
        jobs: