issue installing package on a new nix setup on macOS

[andrewcrook]

I am having trouble getting the package to install I get the following errors.
Also see information below

Trying to install

nix-env -f release.nix -iA pip2nix.python39

Result -> FAIL

installing 'python3.9-pip2nix-0.9.0.dev1'
error:
       … while evaluating the attribute 'drvPath'

         at /nix/store/7v68hly36ys9dx3b2514y4dc3fzbhs23-nixpkgs-20.09-src/lib/customisation.nix:163:7:

          162|       outputUnspecified = true;
          163|       drvPath = assert condition; drv.drvPath;
             |       ^
          164|       outPath = assert condition; drv.outPath;

       … while calling the 'derivationStrict' builtin

         at //builtin/derivation.nix:9:12: (source not available)

       (stack trace truncated; use '--show-trace' to show the full trace)

       error: cannot coerce null to a string

OS and Nix version

>nix-shell -p nix-info --run "nix-info -m”
........
 - system: `"aarch64-darwin"`
 - host os: `Darwin 22.4.0, macOS 13.3.1`
 - multi-user?: `yes`
 - sandbox: `no`
 - version: `nix-env (Nix) 2.14.1`
 - nixpkgs: `/Users/andrew/.nix-defexpr/channels/nixpkgs`

Nix Doctor -> PASS

>nix doctor  
[PASS] PATH contains only one nix version.
[PASS] All profiles are gcroots.
[PASS] Client protocol matches store protocol.

Checking flake -- FAIL

> nix flake check  
error:
       … while checking flake output 'packages'

         at /nix/store/4w4b4mxfhdc9lf3rsf4qqa9z8xnijbxl-source/lib.nix:73:15:

           72|             {
           73|               ${key} = (attrs.${key} or { })
             |               ^
           74|               // (appendSystem key system ret);

       … while checking the derivation 'packages.aarch64-darwin.pip2nix'

         at /nix/store/blyv4jldr6vh881fa3j5b36lf34fdc6a-source/release.nix:20:5:

           19|
           20|     pip2nix = filterAttrs (n: v: n != "recurseForDerivations") (
             |     ^
           21|       pkgs.recurseIntoAttrs (

       error: flake attribute 'packages.aarch64-darwin.pip2nix' is not a derivation

[andrewcrook]

extended trace

nix-env --show-trace -f release.nix -iA pip2nix.python39

installing 'python3.9-pip2nix-0.9.0.dev1'
error:
       … while evaluating the attribute 'drvPath'

         at /nix/store/7v68hly36ys9dx3b2514y4dc3fzbhs23-nixpkgs-20.09-src/lib/customisation.nix:163:7:

          162|       outputUnspecified = true;
          163|       drvPath = assert condition; drv.drvPath;
             |       ^
          164|       outPath = assert condition; drv.outPath;

       … while calling the 'derivationStrict' builtin

         at //builtin/derivation.nix:9:12: (source not available)

       … while evaluating derivation 'python3.9-pip2nix-0.9.0.dev1'
         whose name attribute is located at /nix/store/7v68hly36ys9dx3b2514y4dc3fzbhs23-nixpkgs-20.09-src/pkgs/development/interpreters/python/mk-python-derivation.nix:108:5

       … while evaluating attribute 'buildInputs' of derivation 'python3.9-pip2nix-0.9.0.dev1'

         at /nix/store/7v68hly36ys9dx3b2514y4dc3fzbhs23-nixpkgs-20.09-src/pkgs/stdenv/generic/make-derivation.nix:221:11:

          220|           depsHostHost                = lib.elemAt (lib.elemAt dependencies 1) 0;
          221|           buildInputs                 = lib.elemAt (lib.elemAt dependencies 1) 1;
             |           ^
          222|           depsTargetTarget            = lib.elemAt (lib.elemAt dependencies 2) 0;

       … while evaluating derivation 'python3.9-pip-20.1.1'
         whose name attribute is located at /nix/store/7v68hly36ys9dx3b2514y4dc3fzbhs23-nixpkgs-20.09-src/pkgs/development/interpreters/python/mk-python-derivation.nix:108:5

       … while evaluating attribute 'nativeBuildInputs' of derivation 'python3.9-pip-20.1.1'

         at /nix/store/7v68hly36ys9dx3b2514y4dc3fzbhs23-nixpkgs-20.09-src/pkgs/stdenv/generic/make-derivation.nix:218:11:

          217|           depsBuildBuild              = lib.elemAt (lib.elemAt dependencies 0) 0;
          218|           nativeBuildInputs           = lib.elemAt (lib.elemAt dependencies 0) 1;
             |           ^
          219|           depsBuildTarget             = lib.elemAt (lib.elemAt dependencies 0) 2;

       … while evaluating derivation 'python3-3.9.0'
         whose name attribute is located at /nix/store/7v68hly36ys9dx3b2514y4dc3fzbhs23-nixpkgs-20.09-src/pkgs/stdenv/generic/make-derivation.nix:192:11

       … while evaluating attribute 'CPPFLAGS' of derivation 'python3-3.9.0'

         at /nix/store/7v68hly36ys9dx3b2514y4dc3fzbhs23-nixpkgs-20.09-src/pkgs/development/interpreters/python/cpython/default.nix:165:3:

          164|
          165|   CPPFLAGS = concatStringsSep " " (map (p: "-I${getDev p}/include") buildInputs);
             |   ^
          166|   LDFLAGS = concatStringsSep " " (map (p: "-L${getLib p}/lib") buildInputs);

       … while calling anonymous lambda

         at /nix/store/7v68hly36ys9dx3b2514y4dc3fzbhs23-nixpkgs-20.09-src/pkgs/development/interpreters/python/cpython/default.nix:165:41:

          164|
          165|   CPPFLAGS = concatStringsSep " " (map (p: "-I${getDev p}/include") buildInputs);
             |                                         ^
          166|   LDFLAGS = concatStringsSep " " (map (p: "-L${getLib p}/lib") buildInputs);

       … while evaluating derivation 'zlib-1.2.11'
         whose name attribute is located at /nix/store/7v68hly36ys9dx3b2514y4dc3fzbhs23-nixpkgs-20.09-src/pkgs/development/libraries/zlib/default.nix:23:3

       … while evaluating attribute 'src' of derivation 'zlib-1.2.11'

         at /nix/store/7v68hly36ys9dx3b2514y4dc3fzbhs23-nixpkgs-20.09-src/pkgs/development/libraries/zlib/default.nix:26:3:

           25|
           26|   src = fetchurl {
             |   ^
           27|     urls =

       … while evaluating derivation 'zlib-1.2.11.tar.gz'
         whose name attribute is located at /nix/store/7v68hly36ys9dx3b2514y4dc3fzbhs23-nixpkgs-20.09-src/pkgs/build-support/fetchurl/default.nix:122:3

       … while evaluating attribute 'mirrorsFile' of derivation 'zlib-1.2.11.tar.gz'

         at /nix/store/7v68hly36ys9dx3b2514y4dc3fzbhs23-nixpkgs-20.09-src/pkgs/build-support/fetchurl/default.nix:146:10:

          145|
          146|   inherit curlOpts showURLs mirrorsFile postFetch downloadToTemp executable;
             |          ^
          147|

       … while evaluating derivation 'mirrors-list'
         whose name attribute is located at /nix/store/7v68hly36ys9dx3b2514y4dc3fzbhs23-nixpkgs-20.09-src/pkgs/build-support/fetchurl/default.nix:16:7

       … while evaluating attribute 'stdenv' of derivation 'mirrors-list'

         at /nix/store/7v68hly36ys9dx3b2514y4dc3fzbhs23-nixpkgs-20.09-src/pkgs/stdenv/generic/make-derivation.nix:202:18:

          201|           args = attrs.args or ["-e" (attrs.builder or ./default-builder.sh)];
          202|           inherit stdenv;
             |                  ^
          203|

       … while evaluating derivation 'stdenv'
         whose name attribute is located at /nix/store/7v68hly36ys9dx3b2514y4dc3fzbhs23-nixpkgs-20.09-src/pkgs/stdenv/generic/default.nix:84:14

       … while evaluating attribute 'initialPath' of derivation 'stdenv'

         at /nix/store/7v68hly36ys9dx3b2514y4dc3fzbhs23-nixpkgs-20.09-src/pkgs/stdenv/generic/default.nix:114:14:

          113|
          114|       inherit initialPath shell
             |              ^
          115|         defaultNativeBuildInputs defaultBuildInputs;

       … while evaluating derivation 'xz-5.2.5'
         whose name attribute is located at /nix/store/7v68hly36ys9dx3b2514y4dc3fzbhs23-nixpkgs-20.09-src/pkgs/tools/compression/xz/default.nix:9:3

       … while evaluating attribute 'src' of derivation 'xz-5.2.5'

         at /nix/store/7v68hly36ys9dx3b2514y4dc3fzbhs23-nixpkgs-20.09-src/pkgs/tools/compression/xz/default.nix:11:3:

           10|
           11|   src = fetchurl {
             |   ^
           12|     url = "https://tukaani.org/xz/${name}.tar.bz2";

       … while evaluating derivation 'xz-5.2.5.tar.bz2'
         whose name attribute is located at /nix/store/7v68hly36ys9dx3b2514y4dc3fzbhs23-nixpkgs-20.09-src/pkgs/build-support/fetchurl/default.nix:122:3

       … while evaluating attribute 'nativeBuildInputs' of derivation 'xz-5.2.5.tar.bz2'

         at /nix/store/7v68hly36ys9dx3b2514y4dc3fzbhs23-nixpkgs-20.09-src/pkgs/stdenv/generic/make-derivation.nix:218:11:

          217|           depsBuildBuild              = lib.elemAt (lib.elemAt dependencies 0) 0;
          218|           nativeBuildInputs           = lib.elemAt (lib.elemAt dependencies 0) 1;
             |           ^
          219|           depsBuildTarget             = lib.elemAt (lib.elemAt dependencies 0) 2;

       … while evaluating derivation 'curl-7.72.0'
         whose name attribute is located at /nix/store/7v68hly36ys9dx3b2514y4dc3fzbhs23-nixpkgs-20.09-src/pkgs/stdenv/generic/make-derivation.nix:192:11

       … while evaluating attribute 'configureFlags' of derivation 'curl-7.72.0'

         at /nix/store/7v68hly36ys9dx3b2514y4dc3fzbhs23-nixpkgs-20.09-src/pkgs/stdenv/generic/make-derivation.nix:232:11:

          231|           # This parameter is sometimes a string, sometimes null, and sometimes a list, yuck
          232|           configureFlags = let inherit (lib) optional elem; in
             |           ^
          233|             (/**/ if lib.isString configureFlags then [configureFlags]

       … while evaluating derivation 'openssl-1.1.1g'
         whose name attribute is located at /nix/store/7v68hly36ys9dx3b2514y4dc3fzbhs23-nixpkgs-20.09-src/pkgs/stdenv/generic/make-derivation.nix:192:11

       … while evaluating attribute 'nativeBuildInputs' of derivation 'openssl-1.1.1g'

         at /nix/store/7v68hly36ys9dx3b2514y4dc3fzbhs23-nixpkgs-20.09-src/pkgs/stdenv/generic/make-derivation.nix:218:11:

          217|           depsBuildBuild              = lib.elemAt (lib.elemAt dependencies 0) 0;
          218|           nativeBuildInputs           = lib.elemAt (lib.elemAt dependencies 0) 1;
             |           ^
          219|           depsBuildTarget             = lib.elemAt (lib.elemAt dependencies 0) 2;

       … while evaluating derivation 'perl-5.32.0'
         whose name attribute is located at /nix/store/7v68hly36ys9dx3b2514y4dc3fzbhs23-nixpkgs-20.09-src/pkgs/development/interpreters/perl/default.nix:22:5

       … while evaluating attribute 'disallowedReferences' of derivation 'perl-5.32.0'

         at /nix/store/7v68hly36ys9dx3b2514y4dc3fzbhs23-nixpkgs-20.09-src/pkgs/development/interpreters/perl/default.nix:34:5:

           33|
           34|     disallowedReferences = [ stdenv.cc ];
             |     ^
           35|

       error: cannot coerce null to a string

[datakurre]

Have you tried with nix flakes yet?

[datakurre]

$ nix run github:nix-community/pip2nix
warning: Git tree '/home/mikepurvis/pip2nix' is dirty
Usage: .pip2nix-wrapped [OPTIONS] COMMAND [ARGS]...

Options:
--help Show this message and exit.

Commands:
generate Generate a .nix file with specified packages.
scaffold

[andrewcrook]

Just tried as instructed. I am still getting the same failure...

$ nix run github:nix-community/pip2nix

error:
       … while evaluating the attribute 'drvPath'

         at /nix/store/w5i4gmcbscmwmmzp6k1gq0p7ixdplrrx-source/lib/customisation.nix:163:7:

          162|       outputUnspecified = true;
          163|       drvPath = assert condition; drv.drvPath;
             |       ^
          164|       outPath = assert condition; drv.outPath;

       … while calling the 'derivationStrict' builtin

         at //builtin/derivation.nix:9:12: (source not available)

       (stack trace truncated; use '--show-trace' to show the full trace)

       error: cannot coerce null to a string

[datakurre]

Sorry for the issue, and thanks for all the details. I can access a mac next week and will try this out.

[spott]

I am running into the same problem on macOS. Let me know if you need any more information about my system that might help.