Merge pull request #261 from nix-community/indexers-no-source

WIP: indexers: make use of source-less translators

examples/_d2n-indexer/flake.nix

@@ -0,0 +1,30 @@
+{
+  inputs = {
+    dream2nix.url = "github:nix-community/dream2nix";
+  };
+
+  outputs = inp:
+    (inp.dream2nix.lib.makeFlakeOutputsForIndexes {
+      source = ./.;
+      systems = ["x86_64-linux"];
+      indexes = {
+        libraries-io = {
+          platform = "npm";
+          number = 5;
+        };
+        crates-io = {};
+        crates-io-simple = {
+          sortBy = "name";
+          maxPages = 1;
+        };
+      };
+      packageOverrides = {
+        "^.*$".disable-build = {
+          buildScript = ":";
+        };
+      };
+    })
+    // {
+      checks = inp.self.packages;
+    };
+}

src/apps/translate/default.nix

@@ -1,5 +1,6 @@
 {
   # dream2nix deps
+  framework,
   utils,
   callNixWithD2N,
   translateSourceShortcut,
@@ -21,7 +22,7 @@ utils.writePureShellScriptBin
 ]
 ''
   usage="usage:
-    $0 SOURCE_SHORTCUT TARGET_DIR"
+    $0 PROJECT_JSON TARGET_DIR"
 
   if [ "$#" -ne 2 ]; then
     echo "error: wrong number of arguments"
@@ -29,91 +30,43 @@ utils.writePureShellScriptBin
     exit 1
   fi
 
-  source=''${1:?"error: pass a source shortcut"}
+  projectJson=''${1:?"error: pass projects spec as json string"}
   targetDir=''${2:?"error: please pass a target directory"}
   targetDir="$(realpath "$targetDir")"
-
+  translator=$(jq '.translator' -c -r <(echo $projectJson))
-  sourceInfoPath=''${translateSourceInfoPath:-"$TMPDIR/sourceInfo.json"}
+  name=$(jq '.name' -c -r <(echo $projectJson))
-  translateSkipResolved=''${translateSkipResolved:-"0"}
+  id=$(jq '.id' -c -r <(echo $projectJson))
+  if [ "$id" == "null" ]; then
+    echo "error: 'id' field not specified for project $name"
+    exit 1
+  fi
+  dreamLockPath="$targetDir/$id/dream-lock.json"
 
   mkdir -p $targetDir && cd $targetDir
 
-  export dream2nixConfig="{packagesDir=\"./.\"; projectRoot=\"$targetDir\";}"
+  echo -e "\nTranslating:: $name (translator: $translator) (lock path: $dreamLockPath)"
 
-  # translate the source shortcut
+  translateBin=$(${callNixWithD2N} build --print-out-paths --no-link "
-  ${translateSourceShortcut} $source > $sourceInfoPath
+    dream2nix.framework.translatorInstances.$translator.translateBin
+  ")
 
-  # collect data for the packages we will resolve
+  echo "
-  resolveDatas="$TMPDIR/resolveData.json"
+    {
-  ${callNixWithD2N} eval --json "
+      \"project\": $projectJson,
-    let
+      \"outputFile\": \"$dreamLockPath\"
-      data =
+    }
-        l.map
+  " > $TMPDIR/args.json
-        (
-          p:
-          let
-            resolve = p.passthru.resolve or p.resolve;
-            mkBashEnv = name: value:
-              \"\''${name}=\" + \"'\" + value + \"'\";
-          in
-            # skip this project if we don't want to resolve ones that can be resolved on the fly
-            if \"$translateSkipResolved\" == \"1\" && resolve.passthru.project ? dreamLock
-            then null
-            else
-              # write a simple bash script for exporting the data we need
-              # this is better since we don't need to call jq multiple times
-              # to access the data we need
-              l.concatStringsSep
-              \";\"
-              (
-                (with resolve.passthru.project; [
-                  (mkBashEnv \"name\" name)
-                  (mkBashEnv \"dreamLockPath\" dreamLockPath)
-                  (mkBashEnv \"subsystem\" subsystem)
-                ]) ++ [
-                  (mkBashEnv \"drvPath\" resolve.drvPath)
-                ]
-              )
-        )
-        (
-          l.attrValues
-          (
-            l.removeAttrs
-            (dream2nix.makeOutputs {
-              source = dream2nix.fetchers.fetchSource {
-                source =
-                  l.fromJSON (l.readFile \"$sourceInfoPath\");
-              };
-            }).packages
-            [\"resolveImpure\"]
-          )
-        );
-    in
-      l.unique (l.filter (i: i != null) data)
-  " > $resolveDatas
 
-  # resolve the packages
+  $translateBin $TMPDIR/args.json
-  for resolveData in $(jq '.[]' -c -r $resolveDatas); do
-    # extract project data so we can determine where the dream-lock.json will be
-    eval "$resolveData"
 
-    echo "Resolving:: $name (subsystem: $subsystem) (lock path: $dreamLockPath)"
+  cat $dreamLockPath \
+    | python3 ${../cli/format-dream-lock.py} \
+    | sponge $dreamLockPath
 
-    # build the resolve script and run it
+  ${python3.pkgs.jsonschema}/bin/jsonschema \
-    nix build --out-link $TMPDIR/resolve $drvPath
+      --instance $dreamLockPath \
-    $TMPDIR/resolve/bin/resolve
+      --output pretty \
+      ${../../specifications/dream-lock-schema.json}
 
-    # patch the dream-lock with our source info so the dream-lock works standalone
+  echo -e "\nFinished:: $name (translator: $translator) (lock path: $dreamLockPath)"
-    ${callNixWithD2N} eval --json "
-      with dream2nix.utils.dreamLock;
-      replaceRootSources {
-        dreamLock = l.fromJSON (l.readFile \"$targetDir/$dreamLockPath\");
-        newSourceRoot = l.fromJSON (l.readFile \"$sourceInfoPath\");
-      }
-    " \
-      | python3 ${../cli/format-dream-lock.py} \
-      | sponge "$dreamLockPath"
-
-    echo "Resolved:: $name (subsystem: $subsystem) (lock path: $dreamLockPath)"
-  done
 ''

src/indexers/crates-io-simple/default.nix

@@ -4,10 +4,11 @@
     coreutils,
     curl,
     jq,
+    python3,
     ...
   }:
     utils.writePureShellScript
-    [coreutils curl jq]
+    [coreutils curl jq python3]
     ''
       input=''${1:?"please provide an input as a JSON file"}
 
@@ -19,9 +20,8 @@
       maxPages=$(jq '.maxPages' -c -r $input)
 
       for currentPage in $(seq 1 $maxPages); do
-        jqQuery="$(jq '.' -c -r "$tmpFile") + (.crates | map(\"crates-io:\" + .name + \"\/\" + .max_stable_version))"
         url="https://crates.io/api/v1/crates?page=$currentPage&per_page=100&sort=$sortBy"
-        curl -k "$url" | jq "$jqQuery" -r > "$tmpFile"
+        curl -k "$url" | python3 ${./process-result.py} > "$tmpFile"
       done
 
       mv "$tmpFile" "$(realpath $outFile)"

src/indexers/crates-io-simple/process-result.py

@@ -0,0 +1,13 @@
+import json
+import sys
+
+input = json.load(sys.stdin)
+projects = []
+for package in input['crates']:
+  projects.append(dict(
+    id=f"{package['name']}-{package['max_stable_version']}",
+    name=package['name'],
+    version=package['max_stable_version'],
+    translator='crates-io',
+  ))
+print(json.dumps(projects, indent=2))

src/indexers/crates-io/indexer/src/lib.rs

@@ -1,8 +1,15 @@
 #![deny(rust_2018_idioms)]
+use serde::{Serialize, Deserialize};
 
-use std::collections::BTreeMap;
+#[derive(Serialize, Deserialize)]
+struct Project {
+    id: String,
+    name: String,
+    version: String,
+    translator: String,
+}
 
-pub type Index = Vec<String>;
+pub type Index = Vec<Project>;
 
 #[cfg(feature = "gen")]
 pub use self::indexer::{Indexer, Modifications, Settings};
@@ -60,15 +67,15 @@ mod indexer {
             self.exclusions.iter().any(|n| n == name)
         }
     }
-    
+
     fn default_max_pages() -> u32 {
         1
     }
-    
+
     fn default_sort_by() -> String {
         "downloads".to_string()
     }
-    
+
     fn default_output_file() -> String {
         "./index.json".to_string()
     }
@@ -127,7 +134,7 @@ mod indexer {
             self.page_callback = f;
             self
         }
-        
+
         pub fn write_info(&mut self) {
             let infos = self.generate_info();
             let file =
@@ -199,9 +206,13 @@ mod indexer {
 
                 let pname = summary.name();
                 let version = summary.version().to_string();
-                let hash = summary.checksum().unwrap().to_string();
 
-                let entry = format!("crates-io:{pname}/{version}?hash={hash}");
+                let entry = Project {
+                    id: format!("{pname}-{version}"),
+                    name: pname.to_string(),
+                    version: version,
+                    translator: "crates-io".to_string(),
+                };
 
                 index.push(entry);
             }

src/indexers/libraries-io/default.nix

@@ -21,6 +21,7 @@ libraries.io also supports other interesting popularity metrics:
     curl,
     jq,
     lib,
+    python3,
     ...
   }: let
     l = lib // builtins;
@@ -31,7 +32,7 @@ libraries.io also supports other interesting popularity metrics:
     };
   in
     utils.writePureShellScript
-    [coreutils curl jq]
+    [coreutils curl jq python3]
     ''
       input=''${1:?"please provide an input as a JSON file"}
 
@@ -44,29 +45,24 @@ libraries.io also supports other interesting popularity metrics:
       fi
       apiKey="$API_KEY"
 
-      platform=$(jq '.platform' -c -r $input)
+      export platform=$(jq '.platform' -c -r $input)
-      number=$(jq '.number' -c -r $input)
+      export number=$(jq '.number' -c -r $input)
 
       # calculate number of pages to query
       # page size is always 100
-      # result will be truncated to the given $number
+      # result will be truncated to the given $number later
       numPages=$(($number/100 + ($number % 100 > 0)))
 
       # get platform
       platformQuery=$(jq ".\"$platform\"" -c -r ${l.toFile "platform-map.json" (l.toJSON platformMap)})
-      jqQuery=".[] | [(\"$platform:\" + .name + \"/\" + (.versions | sort_by(.published_at))[-1].number)] | add"
 
       echo "Starting to query $numPages pages..."
 
-      rm -f $outFile
+      echo "[]" > $outFile
       for page in $(seq 1 $numPages); do
         echo "requesting page $page"
         url="https://libraries.io/api/search?page=$page&sort=dependents_count&per_page=100&platforms=$platformQuery&api_key=$apiKey"
-        curl -k "$url" | jq "$jqQuery" -r >> $outFile
+        curl -k "$url" | python3 ${./process-result.py} $outFile
       done
-
-      # truncate entries to $number and convert back to json
-      head -n $number $outFile | jq --raw-input --slurp 'split("\n") | .[0:-1]' > ''${outFile}.final
-      mv ''${outFile}.final $outFile
     '';
 }

src/indexers/libraries-io/process-result.py

@@ -0,0 +1,27 @@
+import json
+import os
+import sys
+
+out_file = sys.argv[1]
+platform = os.environ.get("platform")
+number = int(os.environ.get("number"))
+
+input = json.load(sys.stdin)
+projects = []
+for package in input:
+  versions = package['versions']
+  latest_version =\
+    (sorted(versions, key=lambda v: v['published_at'])[-1])['number']
+  projects.append(dict(
+    id=f"{package['name']}-{latest_version}",
+    name=package['name'],
+    version=latest_version,
+    translator=platform,
+  ))
+
+with open(out_file) as f:
+  existing_projects = json.load(f)
+
+all_projects = (existing_projects + projects)[:number]
+with open(out_file, 'w') as f:
+  json.dump(all_projects, f, indent=2)

src/indexers/npm/default.nix

@@ -4,6 +4,7 @@
     coreutils,
     curl,
     jq,
+    python3,
     ...
   }:
     utils.writePureShellScript
@@ -17,8 +18,7 @@
       size=$(jq '.maxPackageCount' -c -r $input)
 
       url="https://registry.npmjs.org/-/v1/search?text=$text&popularity=1.0&quality=0.0&maintenance=0.0&size=$size"
-      jqQuery="[.objects[].package | [(\"npm:\" + .name + \"/\" + .version)]] | add"
 
-      curl -k "$url" | jq "$jqQuery" -r > $(realpath $outFile)
+      curl -k "$url" | ${python3}/bin/python ${./process-result.py} > $(realpath $outFile)
     '';
 }

src/indexers/npm/process-result.py

@@ -0,0 +1,14 @@
+import json
+import sys
+
+input = json.load(sys.stdin)
+projects = []
+for object in input['objects']:
+  package = object['package']
+  projects.append(dict(
+    id=f"{package['name']}-{package['version']}".replace('/', '_'),
+    name=package['name'],
+    version=package['version'],
+    translator='npm',
+  ))
+print(json.dumps(projects, indent=2))

src/lib.nix

@@ -138,8 +138,7 @@
     pkgs ? null,
     config ? {},
     source,
-    indexNames,
+    indexes,
-    overrideOutputs ? args: {},
     inject ? {},
     packageOverrides ? {},
     settings ? [],
@@ -160,8 +159,7 @@
         allOutputs = dream2nix.utils.makeOutputsForIndexes {
           inherit
             source
-            indexNames
+            indexes
-            overrideOutputs
             inject
             packageOverrides
             settings

src/subsystems/nodejs/translators/npm/default.nix

@@ -0,0 +1,100 @@
+{
+  dlib,
+  lib,
+  ...
+}: {
+  type = "impure";
+
+  # the input format is specified in /specifications/translator-call-example.json
+  # this script receives a json file including the input paths and specialArgs
+  translateBin = {
+    # dream2nix utils
+    apps,
+    subsystems,
+    utils,
+    # nixpkgs dependenies
+    bash,
+    coreutils,
+    git,
+    jq,
+    moreutils,
+    nodePackages,
+    openssh,
+    writeScriptBin,
+    ...
+  }:
+    utils.writePureShellScript
+    [
+      bash
+      coreutils
+      git
+      jq
+      moreutils
+      nodePackages.npm
+      openssh
+    ]
+    ''
+      # accroding to the spec, the translator reads the input from a json file
+      jsonInput=$1
+
+      # read the json input
+      outputFile=$(realpath -m $(jq '.outputFile' -c -r $jsonInput))
+      name=$(jq '.project.name' -c -r $jsonInput)
+      version=$(jq '.project.version' -c -r $jsonInput)
+      npmArgs=$(jq '.project.subsystemInfo.npmArgs' -c -r $jsonInput)
+
+      if [ "$version" = "null" ]; then
+        candidate="$name"
+      else
+        candidate="$name@$version"
+      fi
+
+
+      pushd $TMPDIR
+      newSource=$(pwd)
+
+      npm install $candidate --package-lock-only $npmArgs
+
+      jq ".source = \"$newSource\" | .project.relPath = \"\"" -c -r $jsonInput > $TMPDIR/newJsonInput
+
+      popd
+
+      # call package-lock translator
+      ${subsystems.nodejs.translators.package-lock.translateBin} $TMPDIR/newJsonInput
+
+      # generate source info for main package
+      url=$(npm view $candidate dist.tarball)
+      hash=$(npm view $candidate dist.integrity)
+      echo "
+        {
+          \"type\": \"http\",
+          \"url\": \"$url\",
+          \"hash\": \"$hash\"
+        }
+      " > $TMPDIR/sourceInfo.json
+
+      # add main package source info to dream-lock.json
+      ${apps.callNixWithD2N} eval --json "
+        with dream2nix.utils.dreamLock;
+        replaceRootSources {
+          dreamLock = l.fromJSON (l.readFile \"$outputFile\");
+          newSourceRoot = l.fromJSON (l.readFile \"$TMPDIR/sourceInfo.json\");
+        }
+      " \
+        | sponge "$outputFile"
+    '';
+
+  # inherit options from package-lock translator
+  extraArgs =
+    dlib.translators.translators.nodejs.package-lock.extraArgs
+    // {
+      npmArgs = {
+        description = "Additional arguments for npm";
+        type = "argument";
+        default = "";
+        examples = [
+          "--force"
+        ];
+      };
+    };
+}

src/subsystems/rust/translators/crates-io/default.nix

@@ -0,0 +1,101 @@
+{
+  dlib,
+  lib,
+  ...
+}: {
+  type = "impure";
+
+  # the input format is specified in /specifications/translator-call-example.json
+  # this script receives a json file including the input paths and specialArgs
+  translateBin = {
+    # dream2nix utils
+    apps,
+    subsystems,
+    utils,
+    # nixpkgs dependenies
+    coreutils,
+    curl,
+    gnutar,
+    gzip,
+    jq,
+    moreutils,
+    rustPlatform,
+    ...
+  }:
+    utils.writePureShellScript
+    [
+      coreutils
+      curl
+      gnutar
+      gzip
+      jq
+      moreutils
+      rustPlatform.rust.cargo
+    ]
+    ''
+      # according to the spec, the translator reads the input from a json file
+      jsonInput=$1
+
+      # read the json input
+      outputFile=$(realpath -m $(jq '.outputFile' -c -r $jsonInput))
+      cargoArgs=$(jq '.project.subsystemInfo.cargoArgs | select (.!=null)' -c -r $jsonInput)
+      name=$(jq '.project.name' -c -r $jsonInput)
+      version=$(jq '.project.version' -c -r $jsonInput)
+
+      pushd $TMPDIR
+      mkdir source
+
+      # download and unpack package source
+      curl -L https://crates.io/api/v1/crates/$name/$version/download > $TMPDIR/tarball
+      cd source
+      cat $TMPDIR/tarball | tar xz --strip-components 1
+      cd -
+
+      # generate arguments for cargo-toml translator
+      echo "{
+        \"source\": \"$TMPDIR/source\",
+        \"outputFile\": \"$outputFile\",
+        \"project\": {
+          \"relPath\": \"\",
+          \"subsystemInfo\": {
+            \"cargoArgs\": \"$cargoArgs\"
+          }
+        }
+      }" > $TMPDIR/newJsonInput
+
+      popd
+
+      ${subsystems.rust.translators.cargo-toml.translateBin} $TMPDIR/newJsonInput
+
+      # add main package source info to dream-lock.json
+      echo "
+        {
+          \"type\": \"crates-io\",
+          \"hash\": \"$(sha256sum $TMPDIR/tarball | cut -d " " -f 1)\"
+        }
+      " > $TMPDIR/sourceInfo.json
+
+      ${apps.callNixWithD2N} eval --json "
+        with dream2nix.utils.dreamLock;
+        replaceRootSources {
+          dreamLock = l.fromJSON (l.readFile \"$outputFile\");
+          newSourceRoot = l.fromJSON (l.readFile \"$TMPDIR/sourceInfo.json\");
+        }
+      " \
+        | sponge "$outputFile"
+    '';
+
+  # inherit options from cargo-lock translator
+  extraArgs =
+    dlib.translators.translators.rust.cargo-lock.extraArgs
+    // {
+      cargoArgs = {
+        description = "Additional arguments for Cargo";
+        type = "argument";
+        default = "";
+        examples = [
+          "--verbose"
+        ];
+      };
+    };
+}

src/utils/default.nix

@@ -104,10 +104,9 @@ in
 
         TMPDIR=$(${coreutils}/bin/mktemp -d)
 
-        ${script}
+        trap '${coreutils}/bin/rm -rf "$TMPDIR"' EXIT
 
-        cd
+        ${script}
-        ${coreutils}/bin/rm -rf $TMPDIR
       '';
 
     # builder to create a shell script that has it's own PATH
@@ -121,10 +120,9 @@ in
 
         TMPDIR=$(${coreutils}/bin/mktemp -d)
 
-        ${script}
+        trap '${coreutils}/bin/rm -rf "$TMPDIR"' EXIT
 
-        cd
+        ${script}
-        ${coreutils}/bin/rm -rf $TMPDIR
       '';
 
     # TODO is this really needed? Seems to make builds slower, why not unpack + build?

src/utils/index.nix

@@ -5,6 +5,7 @@
   pkgs,
   apps,
   callPackageDream,
+  utils,
   ...
 } @ topArgs: let
   l = lib // builtins;
@@ -54,30 +55,28 @@ in rec {
     (l.map makePackagesForDreamLock dreamLocks);
   makeOutputsForIndexes = {
     source,
-    indexNames,
+    indexes,
-    overrideOutputs ? args: {},
     settings ? [],
     inject ? {},
     packageOverrides ? {},
     sourceOverrides ? {},
   }: let
     l = lib // builtins;
+    indexNames = l.attrNames indexes;
+
     mkApp = script: {
       type = "app";
       program = toString script;
     };
 
-    mkIndexApp = {
+    mkIndexApp = name: input: let
-      name,
+      inputFinal = {outputFile = "${name}/index.json";} // input;
-      indexerName ? name,
-      input,
-    } @ args: let
-      input = {outputFile = "${name}/index.json";} // args.input;
       script = pkgs.writers.writeBash "index" ''
         set -e
         inputJson="$(${pkgs.coreutils}/bin/mktemp)"
-        echo '${l.toJSON input}' > $inputJson
+        echo '${l.toJSON inputFinal}' > $inputJson
-        ${apps.index}/bin/index ${indexerName} $inputJson
+        mkdir -p $(dirname ${inputFinal.outputFile})
+        ${apps.index}/bin/index ${name} $inputJson
       '';
     in
       mkApp script;
@@ -89,6 +88,27 @@ in rec {
             ${name}/index.json ${name}/locks
         ''
       );
+    mkCiJobApp = name: input:
+      mkApp (
+        utils.writePureShellScript
+        (with pkgs; [
+          coreutils
+          git
+          gnugrep
+        ])
+        ''
+          mainBranch=$(git branch | grep -E '(master)|(main)')
+          git branch data || :
+          git checkout data
+          # the flake should always be the one from the current main branch
+          git checkout $mainBranch flake.nix
+          git checkout $mainBranch flake.lock
+          ${(mkIndexApp name input).program}
+          ${(mkTranslateApp name).program}
+          git add .
+          git commit "automatic update - $(date --rfc-3339=seconds)"
+        ''
+      );
     translateApps = l.listToAttrs (
       l.map
       (
@@ -99,28 +119,26 @@ in rec {
       )
       indexNames
     );
-    translateAllApp = let
+    indexApps = l.listToAttrs (
-      allTranslators =
+      l.mapAttrsToList
-        l.concatStringsSep
+      (
-        "\n"
+        name: input:
-        (
+          l.nameValuePair
-          l.mapAttrsToList
+          "index-${name}"
-          (
+          (mkIndexApp name input)
-            name: translator: ''
+      )
-              echo "::translating with ${name}::"
+      indexes
-              ${translator.program}
+    );
-              echo "::translated with ${name}::"
+    ciJobApps = l.listToAttrs (
-            ''
+      l.mapAttrsToList
-          )
+      (
-          translateApps
+        name: input:
-        );
+          l.nameValuePair
-    in
+          "ci-job-${name}"
-      mkApp (
+          (mkCiJobApp name input)
-        pkgs.writers.writeBash "translate-all" ''
+      )
-          set -e
+      indexes
-          ${allTranslators}
+    );
-        ''
-      );
 
     mkIndexOutputs = name: let
       src = "${toString source}/${name}/locks";
@@ -149,15 +167,10 @@ in rec {
     outputs = {
       packages = allPackages;
       apps =
-        translateApps
+        indexApps
-        // {
+        // translateApps
-          translate = translateAllApp;
+        // ciJobApps;
-        };
     };
   in
-    outputs
+    outputs;
-    // (callPackageDream overrideOutputs {
-      inherit mkIndexApp;
-      prevOutputs = outputs;
-    });
 }

tests/examples/default.nix

@@ -5,10 +5,13 @@
   bash,
   coreutils,
   git,
+  gnugrep,
+  jq,
   parallel,
   nix,
   utils,
   dream2nixWithExternals,
+  pkgs,
   ...
 }: let
   l = lib // builtins;
@@ -20,6 +23,8 @@
       bash
       coreutils
       git
+      gnugrep
+      jq
       nix
     ]
     ''
@@ -31,11 +36,14 @@
       cp -r ${examples}/$dir/* .
       chmod -R +w .
       nix flake lock --override-input dream2nix ${../../.}
-      nix run .#resolveImpure --show-trace
+      if nix flake show | grep -q resolveImpure; then
+        nix run .#resolveImpure --show-trace
+      fi
       # disable --read-only check for these because they do IFD so they will
       # write to store at eval time
       evalBlockList=("haskell_cabal-plan" "haskell_stack-lock")
-      if [[ ! ((''${evalBlockList[*]} =~ "$dir")) ]]; then
+      if [[ ! ((''${evalBlockList[*]} =~ "$dir")) ]] \
+          && [ "$(nix flake show --json | jq 'select(.packages."x86_64-linux".default.name)')" != "" ]; then
         nix eval --read-only --no-allow-import-from-derivation .#default.name
       fi
       nix flake check "$@"