haskellPackages.graphql-engine: update to 2.0.5 + refactor

pkgs/development/haskell-modules/configuration-common.nix

@@ -1293,23 +1293,19 @@ self: super: {
   # Fails with "supports custom headers"
   Spock-core = dontCheck super.Spock-core;
 
-  # Needed by Hasura  1.3.1
-  dependent-map_0_2_4_0 = super.dependent-map_0_2_4_0.override {
-    dependent-sum = self.dependent-sum_0_4;
-  };
-
-  # Hasura 1.3.1
-  # Because of ghc-heap-view, profiling needs to be disabled.
-  graphql-engine = disableLibraryProfiling( overrideCabal (super.graphql-engine.override {
-     immortal = self.immortal_0_2_2_1;
-     dependent-map = self.dependent-map_0_2_4_0;
-     dependent-sum = self.dependent-sum_0_4;
+  # hasura packages need some extra care
+  graphql-engine = overrideCabal (super.graphql-engine.override {
+    immortal = self.immortal_0_2_2_1;
   }) (drv: {
-     # version in cabal file is invalid
-     version = "1.3.1-beta1";
-     # hasura needs VERSION env exported during build
-     preBuild = "export VERSION=1.3.1-beta1";
-  }));
+    patches = [ ./patches/graphql-engine-mapkeys.patch ];
+    doHaddock = false;
+    version = "2.0.5";
+  });
+  pg-client = overrideCabal super.pg-client (drv: {
+    librarySystemDepends = with pkgs; [ postgresql krb5.dev openssl.dev ];
+    # wants a running DB to check against
+    doCheck = false;
+  });
 
   # https://github.com/bos/statistics/issues/170
   statistics = dontCheck super.statistics;

pkgs/development/haskell-modules/configuration-ghc-8.8.x.nix

@@ -41,13 +41,6 @@ self: super: {
   unix = null;
   xhtml = null;
 
-  # Hasura 1.3.1
-  # Because of ghc-heap-view, profiling needs to be disabled.
-  graphql-engine = overrideCabal (super.graphql-engine) (drv: {
-     # GHC 8.8.x needs a revert of https://github.com/hasura/graphql-engine/commit/a77bb0570f4210fb826985e17a84ddcc4c95d3ea
-     patches = [ ./patches/hasura-884-compat.patch ];
-  });
-
   # GHC 8.8.x can build haddock version 2.23.*
   haddock = self.haddock_2_23_1;
   haddock-api = self.haddock-api_2_23_1;

pkgs/development/haskell-modules/non-hackage-packages.nix

@@ -26,14 +26,19 @@ self: super: {
 
   nix-output-monitor = self.callPackage ../../tools/nix/nix-output-monitor { };
 
-  # cabal2nix --revision <rev> https://github.com/hasura/ci-info-hs.git
-  ci-info = self.callPackage ../misc/haskell/hasura/ci-info {};
-  # cabal2nix --revision <rev> https://github.com/hasura/pg-client-hs.git
-  pg-client = self.callPackage ../misc/haskell/hasura/pg-client {};
-  # cabal2nix --revision <rev> https://github.com/hasura/graphql-parser-hs.git
-  graphql-parser = self.callPackage ../misc/haskell/hasura/graphql-parser {};
-  # cabal2nix  --subpath server --maintainer offline --no-check --revision 1.2.1 https://github.com/hasura/graphql-engine.git
-  graphql-engine = self.callPackage ../misc/haskell/hasura/graphql-engine {};
+  # hasura graphql-engine is not released to hackage.
+  # https://github.com/hasura/graphql-engine/issues/7391
+  #
+  # pg-client and graphql-engine depend on a hasura fork of resource-pool
+  # which is provided by pool.nix
+  ci-info = self.callPackage ../misc/haskell/hasura/ci-info.nix {};
+  pg-client = self.callPackage ../misc/haskell/hasura/pg-client.nix {
+    resource-pool = self.callPackage ../misc/haskell/hasura/pool.nix {};
+  };
+  graphql-parser = self.callPackage ../misc/haskell/hasura/graphql-parser.nix {};
+  graphql-engine = self.callPackage ../misc/haskell/hasura/graphql-engine.nix {
+    resource-pool = self.callPackage ../misc/haskell/hasura/pool.nix {};
+  };
 
   # Unofficial fork until PRs are merged https://github.com/pcapriotti/optparse-applicative/pulls/roberth
   # cabal2nix --maintainer roberth https://github.com/hercules-ci/optparse-applicative.git > pkgs/development/misc/haskell/hercules-ci-optparse-applicative.nix

pkgs/development/haskell-modules/patches/graphql-engine-mapkeys.patch

@@ -0,0 +1,13 @@
+diff --git a/server/src-lib/Data/HashMap/Strict/Extended.hs b/server/src-lib/Data/HashMap/Strict/Extended.hs
+index eaff0dfba..5047a0e9d 100644
+--- a/src-lib/Data/HashMap/Strict/Extended.hs
++++ b/src-lib/Data/HashMap/Strict/Extended.hs
+@@ -17,7 +17,7 @@ import qualified Data.Align          as A
+ import qualified Data.Foldable       as F
+ 
+ import           Data.Function
+-import           Data.HashMap.Strict as M
++import           Data.HashMap.Strict as M hiding (mapKeys)
+ import           Data.Hashable
+ import           Data.List.NonEmpty  (NonEmpty (..))
+ import           Data.These

pkgs/development/haskell-modules/patches/hasura-884-compat.patch

@@ -1,26 +0,0 @@
-diff --git server/src-lib/Hasura/GraphQL/Transport/WebSocket/Server.hs server/src-lib/Hasura/GraphQL/Transport/WebSocket/Server.hs
-index 6cb70cf0..0c3789cd 100644
---- server/src-lib/Hasura/GraphQL/Transport/WebSocket/Server.hs
-+++ server/src-lib/Hasura/GraphQL/Transport/WebSocket/Server.hs
-@@ -45,7 +45,7 @@ import           GHC.AssertNF
- import qualified ListT
- import qualified Network.WebSockets                   as WS
- import qualified StmContainers.Map                    as STMMap
--import qualified System.IO.Error                      as E
-+--import qualified System.IO.Error                      as E
- 
- import qualified Hasura.Logging                       as L
- 
-@@ -287,12 +287,6 @@ createServerApp (WSServer logger@(L.Logger writeLog) serverStatus) wsHandlers !p
-           let rcv = forever $ do
-                 -- Process all messages serially (important!), in a separate thread:
-                 msg <- liftIO $ 
--                  -- Re-throw "receiveloop: resource vanished (Connection reset by peer)" :
--                  --   https://github.com/yesodweb/wai/blob/master/warp/Network/Wai/Handler/Warp/Recv.hs#L112 
--                  -- as WS exception signaling cleanup below. It's not clear why exactly this gets 
--                  -- raised occasionally; I suspect an equivalent handler is missing from WS itself.
--                  -- Regardless this should be safe:
--                  handleJust (guard . E.isResourceVanishedError) (\()-> throw WS.ConnectionClosed) $
-                     WS.receiveData conn
-                 writeLog $ WSLog wsId (EMessageReceived $ TBS.fromLBS msg) Nothing
-                 _hOnMessage wsHandlers wsConn msg

pkgs/development/misc/haskell/hasura/ci-info.nix

@@ -1,3 +1,5 @@
+# This has been automatically generated by the script
+# ./update.sh.  This should not be changed by hand.
 { mkDerivation, aeson, aeson-casing, base, fetchgit, hashable
 , hpack, lib, template-haskell, text, th-lift-instances
 , unordered-containers
@@ -7,8 +9,8 @@ mkDerivation {
   version = "0.1.0.0";
   src = fetchgit {
     url = "https://github.com/hasura/ci-info-hs.git";
-    sha256 = "0rn1799z4y7z1c6ijrr0gscarg25zmnfq0z9rrmk4ad727vf1ppc";
-    rev = "6af5a68450347a02295a9cd050d05a8b2f5c06ab";
+    sha256 = "018vfyg0y2sn497nigjrcs6b1v3i9bna06dsbvgr6wjikcl6dhh4";
+    rev = "68247a83738ac4bb9f719f0e4213aeb7be9565cf";
     fetchSubmodules = true;
   };
   libraryHaskellDepends = [

pkgs/development/misc/haskell/hasura/graphql-engine.nix

@@ -0,0 +1,81 @@
+# This has been automatically generated by the script
+# ./update.sh.  This should not be changed by hand.
+{ mkDerivation, aeson, aeson-casing, ansi-wl-pprint, asn1-encoding
+, asn1-types, async, attoparsec, attoparsec-iso8601, auto-update
+, base, base16-bytestring, base64-bytestring, binary, byteorder
+, bytestring, case-insensitive, ci-info, containers, cron
+, cryptonite, data-has, deepseq, dependent-map, dependent-sum
+, directory, ekg-core, ekg-json, exceptions, fast-logger, fetchgit
+, file-embed, filepath, generic-arbitrary, ghc-heap-view
+, graphql-parser, hashable, hashable-time, hspec, hspec-core
+, hspec-expectations, hspec-expectations-lifted, http-api-data
+, http-client, http-client-tls, http-conduit, http-types, immortal
+, insert-ordered-containers, jose, kan-extensions, lens, lens-aeson
+, lib, lifted-async, lifted-base, list-t, memory, mime-types
+, mmorph, monad-control, monad-loops, monad-validate, mtl, mustache
+, mysql, mysql-simple, natural-transformation, network, network-uri
+, odbc, optparse-applicative, pem, pg-client, postgresql-binary
+, postgresql-libpq, process, profunctors, psqueues, QuickCheck
+, quickcheck-instances, random, regex-tdfa, resource-pool, retry
+, safe, safe-exceptions, scientific, semialign, semigroups, semver
+, shakespeare, some, split, Spock-core, stm, stm-containers, tagged
+, template-haskell, text, text-builder, text-conversions, these
+, time, transformers, transformers-base, unix, unordered-containers
+, uri-encode, utf8-string, uuid, validation, vector
+, vector-instances, wai, warp, websockets, wreq, x509, x509-store
+, yaml, zlib
+}:
+mkDerivation {
+  pname = "graphql-engine";
+  version = "1.0.0";
+  src = fetchgit {
+    url = "https://github.com/hasura/graphql-engine.git";
+    sha256 = "0sw7jwj3ixr0nnh3i9yagiqjsvf83w79jd7ac9vdvm410jfjcnxf";
+    rev = "5990ca403bf6e7dd66081720c329e513f0624fb6";
+    fetchSubmodules = true;
+  };
+  postUnpack = "sourceRoot+=/server; echo source root reset to $sourceRoot";
+  isLibrary = true;
+  isExecutable = true;
+  libraryHaskellDepends = [
+    aeson aeson-casing ansi-wl-pprint asn1-encoding asn1-types async
+    attoparsec attoparsec-iso8601 auto-update base base16-bytestring
+    base64-bytestring binary byteorder bytestring case-insensitive
+    ci-info containers cron cryptonite data-has deepseq dependent-map
+    dependent-sum directory ekg-core ekg-json exceptions fast-logger
+    file-embed filepath ghc-heap-view graphql-parser hashable
+    hashable-time http-api-data http-client http-client-tls
+    http-conduit http-types immortal insert-ordered-containers jose
+    kan-extensions lens lens-aeson lifted-async lifted-base list-t
+    memory mime-types mmorph monad-control monad-loops monad-validate
+    mtl mustache mysql mysql-simple network network-uri odbc
+    optparse-applicative pem pg-client postgresql-binary
+    postgresql-libpq process profunctors psqueues QuickCheck
+    quickcheck-instances random regex-tdfa resource-pool retry
+    safe-exceptions scientific semialign semigroups semver shakespeare
+    some split Spock-core stm stm-containers tagged template-haskell
+    text text-builder text-conversions these time transformers
+    transformers-base unix unordered-containers uri-encode utf8-string
+    uuid validation vector vector-instances wai warp websockets wreq
+    x509 x509-store yaml zlib
+  ];
+  executableHaskellDepends = [
+    base bytestring ekg-core kan-extensions pg-client text
+    text-conversions time unix
+  ];
+  testHaskellDepends = [
+    aeson base bytestring containers cron dependent-map dependent-sum
+    generic-arbitrary graphql-parser hspec hspec-core
+    hspec-expectations hspec-expectations-lifted http-client
+    http-client-tls http-types insert-ordered-containers jose
+    kan-extensions lens lifted-base mmorph monad-control mtl
+    natural-transformation network-uri optparse-applicative pg-client
+    process QuickCheck safe scientific split template-haskell text time
+    transformers-base unordered-containers vector
+  ];
+  doCheck = false;
+  homepage = "https://www.hasura.io";
+  description = "GraphQL API over Postgres";
+  license = lib.licenses.asl20;
+  maintainers = with lib.maintainers; [ lassulus ];
+}

pkgs/development/misc/haskell/hasura/graphql-engine/default.nix

@@ -1,75 +0,0 @@
-{ mkDerivation, aeson, aeson-casing, ansi-wl-pprint, asn1-encoding
-, asn1-types, async, attoparsec, attoparsec-iso8601, auto-update
-, base, base64-bytestring, byteorder, bytestring, case-insensitive
-, ci-info, containers, criterion, cryptonite, data-has, deepseq
-, dependent-map, dependent-sum, directory, ekg-core, ekg-json
-, fast-logger, fetchgit, file-embed, filepath, generic-arbitrary
-, ghc-heap-view, graphql-parser, hashable, hspec, hspec-core
-, hspec-expectations-lifted, http-client, http-client-tls
-, http-types, immortal, insert-ordered-containers, jose, lens
-, lifted-async, lifted-base, list-t, mime-types, monad-control
-, monad-time, monad-validate, mtl, mustache, mwc-probability
-, mwc-random, natural-transformation, network, network-uri
-, optparse-applicative, pem, pg-client, postgresql-binary
-, postgresql-libpq, process, profunctors, psqueues, QuickCheck
-, regex-tdfa, safe, scientific, semver, shakespeare, split
-, Spock-core, lib, stm, stm-containers, template-haskell, text
-, text-builder, text-conversions, th-lift-instances, these, time
-, transformers, transformers-base, unix, unordered-containers
-, uri-encode, uuid, vector, wai, wai-websockets, warp, websockets
-, wreq, x509, yaml, zlib, witherable, semialign, validation, cron
-}:
-mkDerivation {
-  pname = "graphql-engine";
-  version = "1.0.0";
-  src = fetchgit {
-    url = "https://github.com/hasura/graphql-engine.git";
-    sha256 = "sha256-tNKoi3dtoXj0nn4qBgLBroo7SgX7SdVaHtBqjs1S3hQ=";
-    rev = "1e3eb035d3c915032ba23e502bcb0132b4d54202";
-    fetchSubmodules = true;
-  };
- postUnpack = "sourceRoot+=/server; echo source root reset to $sourceRoot";
-  isLibrary = true;
-  isExecutable = true;
-  libraryHaskellDepends = [
-    aeson aeson-casing ansi-wl-pprint asn1-encoding asn1-types async
-    attoparsec attoparsec-iso8601 auto-update base base64-bytestring
-    byteorder bytestring case-insensitive ci-info containers cryptonite
-    data-has deepseq dependent-map dependent-sum directory ekg-core
-    ekg-json fast-logger file-embed filepath generic-arbitrary
-    ghc-heap-view graphql-parser hashable http-client http-client-tls
-    http-types immortal insert-ordered-containers jose lens
-    lifted-async lifted-base list-t mime-types monad-control monad-time
-    monad-validate mtl mustache network network-uri
-    optparse-applicative pem pg-client postgresql-binary
-    postgresql-libpq process profunctors psqueues QuickCheck regex-tdfa
-    scientific semver shakespeare split Spock-core stm stm-containers
-    template-haskell text text-builder text-conversions
-    th-lift-instances these time transformers transformers-base unix
-    unordered-containers uri-encode uuid vector wai wai-websockets warp
-    websockets wreq x509 yaml zlib
-    witherable semialign validation
-    cron
-  ];
-  executableHaskellDepends = [
-    base bytestring pg-client text text-conversions
-  ];
-  testHaskellDepends = [
-    aeson base bytestring hspec hspec-core hspec-expectations-lifted
-    http-client http-client-tls lifted-base monad-control mtl
-    natural-transformation optparse-applicative pg-client process
-    QuickCheck safe split text time transformers-base
-    unordered-containers
-  ];
-  benchmarkHaskellDepends = [
-    async base bytestring criterion deepseq mwc-probability mwc-random
-    split text vector
-  ];
-  doCheck = false;
-  homepage = "https://www.hasura.io";
-  description = "GraphQL API over Postgres";
-  license = lib.licenses.asl20;
-  maintainers = with lib.maintainers; [ offline ];
-  hydraPlatforms = [];
-  broken = true;
-}

pkgs/development/misc/haskell/hasura/graphql-parser.nix

@@ -0,0 +1,32 @@
+# This has been automatically generated by the script
+# ./update.sh.  This should not be changed by hand.
+{ mkDerivation, aeson, attoparsec, base, bytestring, containers
+, criterion, deepseq, fetchgit, filepath, hashable, hedgehog, lib
+, prettyprinter, scientific, template-haskell, text, text-builder
+, th-lift-instances, unordered-containers, vector
+}:
+mkDerivation {
+  pname = "graphql-parser";
+  version = "0.2.0.0";
+  src = fetchgit {
+    url = "https://github.com/hasura/graphql-parser-hs.git";
+    sha256 = "015b1h475k8wmhm9hkrvyxr985x7d8yc0xgcdqj7vmziixvfwwwj";
+    rev = "79beb0e85e00422a8a15318c0bc573765fc7b246";
+    fetchSubmodules = true;
+  };
+  libraryHaskellDepends = [
+    aeson attoparsec base bytestring containers deepseq filepath
+    hashable hedgehog prettyprinter scientific template-haskell text
+    text-builder th-lift-instances unordered-containers vector
+  ];
+  testHaskellDepends = [
+    attoparsec base bytestring hedgehog prettyprinter scientific text
+    text-builder
+  ];
+  benchmarkHaskellDepends = [
+    base bytestring criterion prettyprinter text text-builder
+  ];
+  homepage = "https://github.com/hasura/graphql-parser-hs";
+  description = "A native Haskell GraphQL parser";
+  license = lib.licenses.bsd3;
+}

pkgs/development/misc/haskell/hasura/graphql-parser/default.nix

@@ -1,36 +0,0 @@
-{ mkDerivation, aeson, attoparsec, base, bytestring, containers
-, criterion, fetchgit, filepath, hedgehog, hpack, prettyprinter
-, protolude, regex-tdfa, scientific, lib, template-haskell, text
-, text-builder, th-lift-instances, unordered-containers, vector
-}:
-mkDerivation {
-  pname = "graphql-parser";
-  version = "0.1.0.1";
-  src = fetchgit {
-    url = "https://github.com/hasura/graphql-parser-hs.git";
-    sha256 = "sha256-oem/h0AQPk7eSM/P6wMoWV9KirxutE4hnQWwrpQ6TGk=";
-    rev = "ba8e26fef1488cf3c8c08e86f02730f56ec84e1f";
-    fetchSubmodules = true;
-  };
-  libraryHaskellDepends = [
-    aeson attoparsec base bytestring containers filepath hedgehog
-    prettyprinter protolude regex-tdfa scientific template-haskell text
-    text-builder th-lift-instances unordered-containers vector
-  ];
-  libraryToolDepends = [ hpack ];
-  testHaskellDepends = [
-    aeson attoparsec base bytestring containers filepath hedgehog
-    prettyprinter protolude regex-tdfa scientific template-haskell text
-    text-builder th-lift-instances unordered-containers vector
-  ];
-  benchmarkHaskellDepends = [
-    aeson attoparsec base bytestring containers criterion filepath
-    hedgehog prettyprinter protolude regex-tdfa scientific
-    template-haskell text text-builder th-lift-instances
-    unordered-containers vector
-  ];
-  doCheck = false;
-  prePatch = "hpack";
-  homepage = "https://github.com/hasura/graphql-parser-hs#readme";
-  license = lib.licenses.bsd3;
-}

pkgs/development/misc/haskell/hasura/pg-client.nix

@@ -0,0 +1,35 @@
+# This has been automatically generated by the script
+# ./update.sh.  This should not be changed by hand.
+{ mkDerivation, aeson, aeson-casing, attoparsec, base, bytestring
+, Cabal, criterion, ekg-core, fetchgit, file-embed, hashable
+, hashtables, hasql, hasql-pool, hasql-transaction, hspec, lib
+, mmorph, monad-control, mtl, postgresql, postgresql-binary
+, postgresql-libpq, resource-pool, retry, scientific
+, template-haskell, text, text-builder, time, transformers-base
+, uuid, vector
+}:
+mkDerivation {
+  pname = "pg-client";
+  version = "0.1.0";
+  src = fetchgit {
+    url = "https://github.com/hasura/pg-client-hs.git";
+    sha256 = "1y79s3ai4h82szpm1j5n5ygybqr7cza9l0raxf39vgn66jhy1jd2";
+    rev = "92975d0f8f933c8d06913dc97af259253bf7fb5f";
+    fetchSubmodules = true;
+  };
+  setupHaskellDepends = [ base Cabal ];
+  libraryHaskellDepends = [
+    aeson aeson-casing attoparsec base bytestring ekg-core hashable
+    hashtables mmorph monad-control mtl postgresql-binary
+    postgresql-libpq resource-pool retry scientific template-haskell
+    text text-builder time transformers-base uuid vector
+  ];
+  librarySystemDepends = [ postgresql ];
+  testHaskellDepends = [ base bytestring hspec mtl ];
+  benchmarkHaskellDepends = [
+    base bytestring criterion file-embed hashable hasql hasql-pool
+    hasql-transaction mtl postgresql-libpq text text-builder
+  ];
+  homepage = "https://github.com/hasura/platform";
+  license = lib.licenses.bsd3;
+}

pkgs/development/misc/haskell/hasura/pg-client/default.nix

@@ -1,30 +0,0 @@
-{ mkDerivation, aeson, aeson-casing, attoparsec, base, bytestring
-, criterion, fetchgit, file-embed, hashable, hashtables, hasql
-, hasql-pool, hasql-transaction, monad-control, mtl
-, postgresql-binary, postgresql-libpq, resource-pool, retry
-, scientific, lib, template-haskell, text, text-builder, th-lift
-, th-lift-instances, time, transformers-base, uuid, vector
-}:
-mkDerivation {
-  pname = "pg-client";
-  version = "0.1.0";
-  src = fetchgit {
-    url = "https://github.com/hasura/pg-client-hs.git";
-    sha256 = "1941gj5yp24kx0xb1nd774nwp5vnpsp6m83isqkwpyz9spl4sq7l";
-    rev = "70a849d09bea9461e72c5a5bbde06df65aab61c0";
-    fetchSubmodules = true;
-  };
-  libraryHaskellDepends = [
-    aeson aeson-casing attoparsec base bytestring hashable hashtables
-    monad-control mtl postgresql-binary postgresql-libpq resource-pool
-    retry scientific template-haskell text text-builder th-lift
-    th-lift-instances time transformers-base uuid vector
-  ];
-  testHaskellDepends = [ base ];
-  benchmarkHaskellDepends = [
-    base bytestring criterion file-embed hashable hasql hasql-pool
-    hasql-transaction mtl postgresql-libpq text text-builder
-  ];
-  homepage = "https://github.com/hasura/platform";
-  license = lib.licenses.bsd3;
-}

pkgs/development/misc/haskell/hasura/pool.nix

@@ -0,0 +1,23 @@
+# This has been automatically generated by the script
+# ./update.sh.  This should not be changed by hand.
+{ mkDerivation, base, fetchgit, hashable, hspec, lib, monad-control
+, stm, time, transformers, transformers-base, vector
+}:
+mkDerivation {
+  pname = "resource-pool";
+  version = "0.2.3.2";
+  src = fetchgit {
+    url = "https://github.com/hasura/pool.git";
+    sha256 = "00q1fxh72fgjwl1pi3lnp4xg8f3kfm6q12gs9scinwbymfgzarms";
+    rev = "bc4c3f739a8fb8ec4444336a34662895831c9acf";
+    fetchSubmodules = true;
+  };
+  libraryHaskellDepends = [
+    base hashable monad-control stm time transformers transformers-base
+    vector
+  ];
+  testHaskellDepends = [ base hspec ];
+  homepage = "http://github.com/bos/pool";
+  description = "A high-performance striped resource pooling implementation";
+  license = lib.licenses.bsd3;
+}

pkgs/development/misc/haskell/hasura/update.sh

@@ -0,0 +1,71 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p cabal2nix curl jq -I nixpkgs=.
+#
+# This script will update the hasura derivations to the latest version using
+# cabal2nix.
+#
+# Note that you should always try building hasura graphql-engine after updating it here, since
+# some of the overrides in pkgs/development/haskell/configuration-nix.nix may
+# need to be updated/changed.
+
+set -eo pipefail
+
+# This is the directory of this update.sh script.
+script_dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+
+# graphql-engine derivation created with cabal2nix.
+engine_derivation_file="${script_dir}/graphql-engine.nix"
+parser_derivation_file="${script_dir}/graphql-parser.nix"
+ciinfo_derivation_file="${script_dir}/ci-info.nix"
+pgclient_derivation_file="${script_dir}/pg-client.nix"
+pool_derivation_file="${script_dir}/pool.nix"
+
+# TODO: get current revision of graphql-engine in Nixpkgs.
+# old_version="$(sed -En 's/.*\bversion = "(.*?)".*/\1/p' "$engine_derivation_file")"
+
+# This is the latest release version of graphql-engine on GitHub.
+new_version=$(curl --silent "https://api.github.com/repos/hasura/graphql-engine/releases" | jq '.[0].tag_name' --raw-output)
+
+echo "Running cabal2nix and outputting to ${engine_derivation_file}..."
+
+echo "# This has been automatically generated by the script" > "$engine_derivation_file"
+echo "# ./update.sh.  This should not be changed by hand." >> "$engine_derivation_file"
+
+# 2.0.5 hardcoded for now, because 2.0.6 failed to build. should be removed when updating
+# cabal2nix --revision "$new_version" --subpath server --maintainer lassulus "https://github.com/hasura/graphql-engine.git" >> "$engine_derivation_file"
+cabal2nix --revision "v2.0.5" --subpath server --maintainer lassulus --no-check "https://github.com/hasura/graphql-engine.git" >> "$engine_derivation_file"
+
+echo "Running cabal2nix and outputting to ${parser_derivation_file}..."
+
+echo "# This has been automatically generated by the script" > "$parser_derivation_file"
+echo "# ./update.sh.  This should not be changed by hand." >> "$parser_derivation_file"
+
+cabal2nix "https://github.com/hasura/graphql-parser-hs.git" >> "$parser_derivation_file"
+
+echo "Running cabal2nix and outputting to ${ciinfo_derivation_file}..."
+
+echo "# This has been automatically generated by the script" > "$ciinfo_derivation_file"
+echo "# ./update.sh.  This should not be changed by hand." >> "$ciinfo_derivation_file"
+
+cabal2nix "https://github.com/hasura/ci-info-hs.git" >> "$ciinfo_derivation_file"
+
+echo "Running cabal2nix and outputting to ${pgclient_derivation_file}..."
+
+echo "# This has been automatically generated by the script" > "$pgclient_derivation_file"
+echo "# ./update.sh.  This should not be changed by hand." >> "$pgclient_derivation_file"
+
+cabal2nix "https://github.com/hasura/pg-client-hs.git" >> "$pgclient_derivation_file"
+
+echo "Running cabal2nix and outputting to ${pool_derivation_file}..."
+
+echo "# This has been automatically generated by the script" > "$pool_derivation_file"
+echo "# ./update.sh.  This should not be changed by hand." >> "$pool_derivation_file"
+
+cabal2nix "https://github.com/hasura/pool.git" >> "$pool_derivation_file"
+
+echo "###################"
+echo "please update pkgs/servers/hasura/cli.nix vendorSha256"
+echo "please update pkgs/development/haskell-modules/configuration-common.nix graphql-engine version"
+echo "###################"
+
+echo "Finished."