Subject: bug#47871: closed (Re: bug#47871: [PATCH] import: Remove Nix importer.)

From: [email-masked] (GNU bug Tracking System)
Date: Tue, 20 Apr 2021 10:38:02 +0000

Your bug report

#47871: [PATCH] import: Remove Nix importer.

which was filed against the guix-patches package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to [email-masked].

-- 
47871: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=47871
GNU Bug Tracking System
Contact [email-masked] with problems

Subject: Re: bug#47871: [PATCH] import: Remove Nix importer.
From: Ludovic Courtès <[email-masked]>
To: Leo Famulari <[email-masked]>
Cc: [email-masked]
Date: Tue, 20 Apr 2021 12:36:57 +0200
List-Id: <debbugs-submit.debbugs.gnu.org>

Hi,

Leo Famulari <[email-masked]> skribis:

> On Sun, Apr 18, 2021 at 03:44:58PM +0200, Ludovic Courtès wrote:
>> I think we should stop making false promises about this importer,
>> so here we go.  I think it’s OK to apply during string freeze
>> because it removes text without changing existing text.
>
> Yeah, I agree it's time to remove it. Too often we have to tell people
> that it doesn't work.

Done in d95168321f4a9bf6857b598da0a183b45a868d54.

>> Did you know that this code is actually the oldest piece of code
>> in Guix?  It was initially part of ‘gnupdater’, a script I had
>> written to update GNU package definitions in Nixpkgs.  Technically,
>> it even predates Guix by one or two years.  :-)
>
> Wow! That's really something. It will be sad to see it go, but on the
> other hand it's cool to see that we've outgrown it.

Yup.  :-)

Thanks,
Ludo’.

Subject: [PATCH] import: Remove Nix importer.
From: Ludovic Courtès <[email-masked]>
To: [email-masked]
Cc: Ludovic Courtès <[email-masked]>
Date: Sun, 18 Apr 2021 15:44:58 +0200
List-Id: <debbugs-submit.debbugs.gnu.org>

This importer has suffered from bitrot and no longer works with current
Nix and Nixpkgs.  See <https://bugs.gnu.org/32339> and
<https://bugs.gnu.org/36255>.

* guix/import/snix.scm, guix/scripts/import/nix.scm,
tests/snix.scm: Remove.
* Makefile.am (MODULES, SCM_TESTS): Remove them.
* guix/scripts/import.scm (importers): Remove "nix".
* build-aux/test-env.in: Remove NIXPKGS variable.
* configure.ac: Remove '--with-nixpkgs' option.
* doc/guix.texi (Invoking guix import): Remove bit about "guix import
nix".
* etc/completion/fish/guix.fish: Likewise.
---
 Makefile.am                   |   3 -
 build-aux/test-env.in         |   7 +-
 configure.ac                  |  17 --
 doc/guix.texi                 |  30 ---
 etc/completion/fish/guix.fish |   2 -
 guix/import/snix.scm          | 467 ----------------------------------
 guix/scripts/import.scm       |   4 +-
 guix/scripts/import/nix.scm   |  90 -------
 tests/snix.scm                |  73 ------
 9 files changed, 4 insertions(+), 689 deletions(-)
 delete mode 100644 guix/import/snix.scm
 delete mode 100644 guix/scripts/import/nix.scm
 delete mode 100644 tests/snix.scm

Hi!

I think we should stop making false promises about this importer,
so here we go.  I think it’s OK to apply during string freeze
because it removes text without changing existing text.

Did you know that this code is actually the oldest piece of code
in Guix?  It was initially part of ‘gnupdater’, a script I had
written to update GNU package definitions in Nixpkgs.  Technically,
it even predates Guix by one or two years.  :-)

Ludo’.

diff --git a/Makefile.am b/Makefile.am
index 17ad236655..1259d3727b 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -261,7 +261,6 @@ MODULES =					\
   guix/import/opam.scm				\
   guix/import/print.scm				\
   guix/import/pypi.scm				\
-  guix/import/snix.scm				\
   guix/import/stackage.scm			\
   guix/import/texlive.scm   			\
   guix/import/utils.scm				\
@@ -300,7 +299,6 @@ MODULES =					\
   guix/scripts/import/go.scm			\
   guix/scripts/import/hackage.scm		\
   guix/scripts/import/json.scm  		\
-  guix/scripts/import/nix.scm			\
   guix/scripts/import/opam.scm			\
   guix/scripts/import/pypi.scm			\
   guix/scripts/import/stackage.scm		\
@@ -489,7 +487,6 @@ SCM_TESTS =					\
   tests/services/linux.scm			\
   tests/sets.scm				\
   tests/size.scm				\
-  tests/snix.scm				\
   tests/status.scm				\
   tests/store-database.scm			\
   tests/store-deduplication.scm		\
diff --git a/build-aux/test-env.in b/build-aux/test-env.in
index 59ab58cc94..7efc43206c 100644
--- a/build-aux/test-env.in
+++ b/build-aux/test-env.in
@@ -1,7 +1,7 @@
 #!/bin/sh
 
 # GNU Guix --- Functional package management for GNU
-# Copyright © 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019 Ludovic Courtès <[email-masked]>
+# Copyright © 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2021 Ludovic Courtès <[email-masked]>
 #
 # This file is part of GNU Guix.
 #
@@ -91,14 +91,11 @@ then
     # Place for the substituter's cache.
     XDG_CACHE_HOME="$GUIX_STATE_DIRECTORY/cache-$$"
 
-    # For the (guix import snix) tests.
-    NIXPKGS="@NIXPKGS@"
-
     export NIX_IGNORE_SYMLINK_STORE NIX_STORE_DIR		\
 	GUIX_LOG_DIRECTORY GUIX_STATE_DIRECTORY GUIX_DATABASE_DIRECTORY	\
 	GUIX_BINARY_SUBSTITUTE_URL				\
         GUIX_ALLOW_UNAUTHENTICATED_SUBSTITUTES			\
-        GUIX_CONFIGURATION_DIRECTORY XDG_CACHE_HOME NIXPKGS
+        GUIX_CONFIGURATION_DIRECTORY XDG_CACHE_HOME
 
     # Launch the daemon without chroot support because is may be
     # unavailable, for instance if we're not running as root.
diff --git a/configure.ac b/configure.ac
index 1598bfae94..e5d339f6ec 100644
--- a/configure.ac
+++ b/configure.ac
@@ -195,23 +195,6 @@ AC_SUBST([GZIP])
 AC_SUBST([BZIP2])
 AC_SUBST([XZ])
 
-AC_ARG_WITH([nixpkgs],
-  [AS_HELP_STRING([--with-nixpkgs=DIR],
-    [search for Nixpkgs in DIR (for testing purposes only)])],
-  [case "$withval" in
-    yes|no) AC_MSG_ERROR([Please use `--with-nixpkgs=DIR'.]);;
-    *)      NIXPKGS="$withval";;
-   esac],
-  [])
-
-AC_MSG_CHECKING([for Nixpkgs source tree])
-if test -f "$NIXPKGS/default.nix"; then
-   AC_MSG_RESULT([$NIXPKGS])
-   AC_SUBST([NIXPKGS])
-else
-   AC_MSG_RESULT([not found])
-fi
-
 LIBGCRYPT_LIBDIR="no"
 LIBGCRYPT_PREFIX="no"
 
diff --git a/doc/guix.texi b/doc/guix.texi
index 58bcfbdbb5..2fe7ad3a2a 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -11417,36 +11417,6 @@ and outputs a package expression:
 guix import json hello.json
 @end example
 
-@item nix
-Import metadata from a local copy of the source of the
-@uref{https://nixos.org/nixpkgs/, Nixpkgs distribution}@footnote{This
-relies on the @command{nix-instantiate} command of
-@uref{https://nixos.org/nix/, Nix}.}.  Package definitions in Nixpkgs are
-typically written in a mixture of Nix-language and Bash code.  This
-command only imports the high-level package structure that is written in
-the Nix language.  It normally includes all the basic fields of a
-package definition.
-
-When importing a GNU package, the synopsis and descriptions are replaced
-by their canonical upstream variant.
-
-Usually, you will first need to do:
-
-@example
-export NIX_REMOTE=daemon
-@end example
-
-@noindent
-so that @command{nix-instantiate} does not try to open the Nix database.
-
-As an example, the command below imports the package definition of
-LibreOffice (more precisely, it imports the definition of the package
-bound to the @code{libreoffice} top-level attribute):
-
-@example
-guix import nix ~/path/to/nixpkgs libreoffice
-@end example
-
 @item hackage
 @cindex hackage
 Import metadata from the Haskell community's central package archive
diff --git a/etc/completion/fish/guix.fish b/etc/completion/fish/guix.fish
index 422baab4bb..8d1a1eb1e9 100644
--- a/etc/completion/fish/guix.fish
+++ b/etc/completion/fish/guix.fish
@@ -322,8 +322,6 @@ complete -f -c guix -n '__fish_guix_needs_command' -a import -d 'Run IMPORTER wi
 ##### import gnu
 complete -f -c guix -n '__fish_guix_using_command import; and not __fish_seen_subcommand_from $remotecommands' -a gnu -d 'Return a package declaration template for PACKAGE, a GNU package.'
 complete -f -c guix -n '__fish_guix_using_command import; and __fish_seen_subcommand_from gnu' -a "--key-download=" -d 'handle missing OpenPGP keys according to POLICY: "always", "never", and "interactive", which is also used when "key-download" is not specified.'
-##### import nix
-complete -f -c guix -n '__fish_guix_using_command import; and not __fish_seen_subcommand_from $remotecommands' -a nix -d 'Import and convert the Nix expression ATTRIBUTE of NIXPKGS.'
 ##### import pypi
 complete -f -c guix -n '__fish_guix_using_command import; and not __fish_seen_subcommand_from $remotecommands' -a pypi -d 'Import and convert the PyPI package for PACKAGE-NAME.'
 ##### import cpan
diff --git a/guix/import/snix.scm b/guix/import/snix.scm
deleted file mode 100644
index 56934e8cf9..0000000000
--- a/guix/import/snix.scm
+++ /dev/null
@@ -1,467 +0,0 @@
-;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 Ludovic Courtès <[email-masked]>
-;;;
-;;; This file is part of GNU Guix.
-;;;
-;;; GNU Guix is free software; you can redistribute it and/or modify it
-;;; under the terms of the GNU General Public License as published by
-;;; the Free Software Foundation; either version 3 of the License, or (at
-;;; your option) any later version.
-;;;
-;;; GNU Guix is distributed in the hope that it will be useful, but
-;;; WITHOUT ANY WARRANTY; without even the implied warranty of
-;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-;;; GNU General Public License for more details.
-;;;
-;;; You should have received a copy of the GNU General Public License
-;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
-
-(define-module (guix import snix)
-  #:use-module (sxml ssax)
-  #:use-module (ice-9 popen)
-  #:use-module (ice-9 match)
-  #:use-module (ice-9 rdelim)
-  #:use-module (ice-9 format)
-  #:use-module (ice-9 regex)
-  #:use-module (ice-9 vlist)
-  #:use-module (srfi srfi-1)
-  #:use-module (srfi srfi-9)
-  #:use-module (srfi srfi-11)
-  #:use-module (srfi srfi-26)
-  #:use-module (srfi srfi-37)
-  #:use-module (system foreign)
-  #:use-module (rnrs bytevectors)
-
-  ;; Use the 'package-name->name+version' procedure that works with
-  ;; hyphen-separate name/version, not the one that works with '@'-separated
-  ;; name/version.  Subtle!
-  #:use-module ((guix utils) #:hide (package-name->name+version))
-  #:use-module ((guix build utils) #:select (package-name->name+version))
-
-  #:use-module (guix import utils)
-  #:use-module (guix base16)
-  #:use-module (guix base32)
-  #:use-module (guix config)
-  #:use-module (guix gnu-maintenance)
-  #:export (open-nixpkgs
-            xml->snix
-            nixpkgs->guix-package))
-
-;;; Commentary:
-;;;
-;;; Converting Nix code to s-expressions, and then to Guix `package'
-;;; declarations, using the XML output of `nix-instantiate'.
-;;;
-;;; Code:
-
-
-;;;
-;;; SNix.
-;;;
-
-;; Nix object types visible in the XML output of `nix-instantiate' and
-;; mapping to S-expressions (we map to sexps, not records, so that we
-;; can do pattern matching):
-;;
-;;   at               (at varpat attrspat)
-;;   attr             (attribute loc name value)
-;;   attrs            (attribute-set attributes)
-;;   attrspat         (attribute-set-pattern patterns)
-;;   bool             #f|#t
-;;   derivation       (derivation drv-path out-path attributes)
-;;   ellipsis         '...
-;;   expr             (snix loc body ...)
-;;   function         (function loc at|attrspat|varpat)
-;;   int              int
-;;   list             list
-;;   null             'null
-;;   path             string
-;;   string           string
-;;   unevaluated      'unevaluated
-;;   varpat           (varpat name)
-;;
-;; Initially ATTRIBUTES in `derivation' and `attribute-set' was a promise;
-;; however, handling `repeated' nodes makes it impossible to do anything
-;; lazily because the whole SXML tree has to be traversed to maintain the
-;; list of known derivations.
-
-(define (xml-element->snix elem attributes body derivations)
-  "Return an SNix element corresponding to XML element ELEM."
-
-  (define (loc)
-    (location (assq-ref attributes 'path)
-              (assq-ref attributes 'line)
-              (assq-ref attributes 'column)))
-
-  (case elem
-    ((at)
-     (values `(at ,(car body) ,(cadr body)) derivations))
-    ((attr)
-     (let ((name (assq-ref attributes 'name)))
-       (cond ((null? body)
-              (values `(attribute-pattern ,name) derivations))
-             ((and (pair? body) (null? (cdr body)))
-              (values `(attribute ,(loc) ,name ,(car body))
-                      derivations))
-             (else
-              (error "invalid attribute body" name (loc) body)))))
-    ((attrs)
-     (values `(attribute-set ,(reverse body)) derivations))
-    ((attrspat)
-     (values `(attribute-set-pattern ,body) derivations))
-    ((bool)
-     (values (string-ci=? "true" (assq-ref attributes 'value))
-             derivations))
-    ((derivation)
-     (let ((drv-path (assq-ref attributes 'drvPath))
-           (out-path (assq-ref attributes 'outPath)))
-       (if (equal? body '(repeated))
-           (let ((body (vhash-assoc drv-path derivations)))
-             (if (pair? body)
-                 (values `(derivation ,drv-path ,out-path ,(cdr body))
-                         derivations)
-
-                 ;; DRV-PATH hasn't been encountered yet but may be later
-                 ;; (see <http://article.gmane.org/gmane.linux.distributions.nixos/5946>.)
-                 ;; Return an `unresolved' node.
-                 (values `(unresolved
-                           ,(lambda (derivations)
-                              (let ((body (vhash-assoc drv-path derivations)))
-                                (if (pair? body)
-                                    `(derivation ,drv-path ,out-path
-                                                 ,(cdr body))
-                                    (error "no previous occurrence of derivation"
-                                           drv-path)))))
-                         derivations)))
-           (values `(derivation ,drv-path ,out-path ,body)
-                   (vhash-cons drv-path body derivations)))))
-    ((ellipsis)
-     (values '... derivations))
-    ((expr)
-     (values `(snix ,(loc) ,@body) derivations))
-    ((function)
-     (values `(function ,(loc) ,body) derivations))
-    ((int)
-     (values (string->number (assq-ref attributes 'value))
-             derivations))
-    ((list)
-     (values body derivations))
-    ((null)
-     (values 'null derivations))
-    ((path)
-     (values (assq-ref attributes 'value) derivations))
-    ((repeated)
-     (values 'repeated derivations))
-    ((string)
-     (values (assq-ref attributes 'value) derivations))
-    ((unevaluated)
-     (values 'unevaluated derivations))
-    ((varpat)
-     (values `(varpat ,(assq-ref attributes 'name)) derivations))
-    (else (error "unhandled Nix XML element" elem))))
-
-(define (resolve snix derivations)
-  "Return a new SNix tree where `unresolved' nodes from SNIX have been
-replaced by the result of their application to DERIVATIONS, a vhash."
-  (let loop ((node snix)
-             (seen vlist-null))
-    (if (vhash-assq node seen)
-        (values node seen)
-        (match node
-          (('unresolved proc)
-           (let ((n (proc derivations)))
-             (values n seen)))
-          ((tag body ...)
-           (let ((body+seen (fold (lambda (n body+seen)
-                                    (call-with-values
-                                        (lambda ()
-                                          (loop n (cdr body+seen)))
-                                      (lambda (n* seen)
-                                        (cons (cons n* (car body+seen))
-                                              (vhash-consq n #t seen)))))
-                                  (cons '() (vhash-consq node #t seen))
-                                  body)))
-             (values (cons tag (reverse (car body+seen)))
-                     (vhash-consq node #t (cdr body+seen)))))
-          (anything
-           (values anything seen))))))
-
-(define xml->snix
-  (let ((parse
-         (ssax:make-parser NEW-LEVEL-SEED
-                           (lambda (elem-gi attributes namespaces expected-content
-                                    seed)
-                             (cons '() (cdr seed)))
-
-                           FINISH-ELEMENT
-                           (lambda (elem-gi attributes namespaces parent-seed
-                                            seed)
-                             (let ((snix        (car seed))
-                                   (derivations (cdr seed)))
-                               (let-values (((snix derivations)
-                                             (xml-element->snix elem-gi
-                                                                attributes
-                                                                snix
-                                                                derivations)))
-                                 (cons (cons snix (car parent-seed))
-                                       derivations))))
-
-                           CHAR-DATA-HANDLER
-                           (lambda (string1 string2 seed)
-                             ;; Discard inter-node strings, which are blanks.
-                             seed))))
-    (lambda (port)
-      "Return the SNix represention of TREE, an SXML tree as returned by
-parsing the XML output of `nix-instantiate' on Nixpkgs."
-      (match (parse port (cons '() vlist-null))
-        (((snix) . derivations)
-         (resolve snix derivations))))))
-
-(define (attribute-value attribute)
-  "Return the value of ATTRIBUTE."
-  (match attribute
-    (('attribute _ _ value) value)))
-
-(define (derivation-source derivation)
-  "Return the \"src\" attribute of DERIVATION or #f if not found."
-  (match derivation
-    (('derivation _ _ (attributes ...))
-     (find-attribute-by-name "src" attributes))))
-
-(define (derivation-output-path derivation)
-  "Return the output path of DERIVATION."
-  (match derivation
-    (('derivation _ out-path _)
-     out-path)
-    (_ #f)))
-
-(define (source-output-path src)
-  "Return the output path of SRC, the \"src\" attribute of a derivation."
-  (derivation-output-path (attribute-value src)))
-
-(define (source-urls src)
-  "Return the URLs of SRC, the \"src\" attribute of a derivation."
-  (match src
-    (('attribute _ _ ('derivation _ _ (attributes ...)))
-     (match (find-attribute-by-name "urls" attributes)
-       (('attribute _ _ value)
-        value)))
-    (_ #f)))
-
-(define (source-sha256 src)
-  "Return the sha256 of SRC, the \"src\" attribute of a derivation, as a
-bytevector."
-  (match src
-    (('attribute _ _ ('derivation _ _ (attributes ...)))
-     (match (find-attribute-by-name "outputHash" attributes)
-       (('attribute _ _ value)
-        (match value
-          ((= string-length 52)
-           (nix-base32-string->bytevector value))
-          ((= string-length 64)
-           (base16-string->bytevector value))
-          (_
-           (error "unsupported hash format" value))))))
-    (_ #f)))
-
-(define (derivation-source-output-path derivation)
-  "Return the output path of the \"src\" attribute of DERIVATION or #f
-if DERIVATION lacks an \"src\" attribute."
-  (and=> (derivation-source derivation) source-output-path))
-
-(define* (open-nixpkgs nixpkgs #:optional attribute)
-  "Return an input pipe to the XML representation of Nixpkgs.  When
-ATTRIBUTE is true, only that attribute is considered."
-  (with-fluids ((%default-port-encoding "UTF-8"))
-    (let ((cross-system (format #f "{
-  config = \"i686-guix-linux-gnu\";
-  libc = \"glibc\";
-  arch = \"guix\";
-  withTLS = true;
-  float = \"hard\";
-  openssl.system = \"linux-generic32\";
-  platform = (import ~a/pkgs/top-level/platforms.nix).sheevaplug;
-}" nixpkgs)))
-      (apply open-pipe* OPEN_READ
-             "nix-instantiate" "--strict" "--eval-only" "--xml"
-
-             ;; Pass a dummy `crossSystem' argument so that `buildInputs' and
-             ;; `nativeBuildInputs' are not coalesced.
-             ;; XXX: This is hacky and has other problems.
-             ;"--arg" "crossSystem" cross-system
-
-             `(,@(if attribute
-                     `("-A" ,attribute)
-                     '())
-               ,nixpkgs)))))
-
-(define (pipe-failed? pipe)
-  "Close pipe and return its status if it failed."
-  (let ((status (close-pipe pipe)))
-    (if (or (status:term-sig status)
-            (not (= (status:exit-val status) 0)))
-        status
-        #f)))
-
-(define (find-attribute-by-name name attributes)
-  "Return attribute NAME in ATTRIBUTES, an attribute set or list of SNix
-attributes, or #f if NAME cannot be found."
-  (find (lambda (a)
-          (match a
-            (('attribute _ (? (cut string=? <> name)) _)
-             a)
-            (_ #f)))
-        (match attributes
-          (('attribute-set (attributes ...))
-           attributes)
-          (_
-           attributes))))
-
-(define (license-variable license)
-  "Return the name of the (guix licenses) variable for LICENSE."
-  (match license
-    ("GPLv2+"    'gpl2+)
-    ("GPLv3+"    'gpl3+)
-    ("LGPLv2+"   'lgpl2.1+)
-    ("LGPLv2.1+" 'lgpl2.1+)
-    ("LGPLv3+"   'lgpl3+)
-    (('attribute-set _ ...)
-     ;; At some point in 2013, Nixpkgs switched to attribute sets to represent
-     ;; licenses.  These are listed in lib/licenses.nix.
-     (match (and=> (find-attribute-by-name "shortName" license)
-                   attribute-value)
-       ("agpl3Plus"  'agpl3+)
-       ("gpl2Plus"   'gpl2+)
-       ("gpl3Plus"   'gpl3+)
-       ("lgpl2Plus"  'lgpl2.0+)
-       ("lgpl21Plus" 'lgpl2.1+)
-       ("lgpl3Plus"  'lgpl3+)
-       ((? string? x) x)
-       (_             license)))
-    (_           license)))
-
-(define (package-source-output-path package)
-  "Return the output path of the \"src\" derivation of PACKAGE."
-  (derivation-source-output-path (attribute-value package)))
-
-
-;;;
-;;; Conversion of "Nix expressions" to "Guix expressions".
-;;;
-
-(define (snix-derivation->guix-package derivation)
-  "Return the `package' s-expression corresponding to SNix DERIVATION, a
-Nixpkgs `stdenv.mkDerivation'-style derivation, and the original source
-location of DERIVATION."
-  (match derivation
-    (('derivation _ _ (attributes ...))
-     (let*-values (((full-name loc)
-                    (match (find-attribute-by-name "name" attributes)
-                      (('attribute loc _ value)
-                       (values value loc))
-                      (_
-                       (values #f #f))))
-                   ((name version)
-                    (package-name->name+version full-name)))
-       (define (convert-inputs type)
-         ;; Convert the derivation's input from a list of SNix derivations to
-         ;; a list of name/variable pairs.
-         (match (and=> (find-attribute-by-name type attributes)
-                       attribute-value)
-           (#f
-            '())
-           ((inputs ...)
-            ;; Inputs can be either derivations or the null value.
-            (filter-map (match-lambda
-                         (('derivation _ _ (attributes ...))
-                          (let* ((full-name
-                                  (attribute-value
-                                   (find-attribute-by-name "name" attributes)))
-                                 (name (package-name->name+version full-name)))
-                            (list name
-                                  (list 'unquote (string->symbol name)))))
-                         ('null #f))
-                        inputs))))
-
-       (define (maybe-inputs guix-name inputs)
-         (match inputs
-           (()
-            '())
-           ((inputs ...)
-            (list (list guix-name
-                        (list 'quasiquote inputs))))))
-
-       (define (pretty-uri uri version)
-         (if version
-             (match (factorize-uri uri version)
-               ((items ...)
-                `(string-append ,@items))
-               (x x))
-             uri))
-
-       (let* ((source  (find-attribute-by-name "src" attributes))
-              (urls    (source-urls source))
-              (sha256  (source-sha256 source))
-              (meta    (and=> (find-attribute-by-name "meta" attributes)
-                              attribute-value)))
-         (values
-          `(package
-             (name ,name)
-             (version ,version)
-             (source (origin
-                      (method url-fetch)
-                      (uri ,(pretty-uri (car urls) version))
-                      (sha256
-                       (base32
-                        ,(bytevector->nix-base32-string sha256)))))
-             (build-system gnu-build-system)
-
-             ;; When doing a native Nixpkgs build, `buildInputs' is empty and
-             ;; everything is in `nativeBuildInputs'.  So we can't distinguish
-             ;; between both, here.
-             ;;
-             ;; Note that `nativeBuildInputs' was renamed from
-             ;; `buildNativeInputs' in Nixpkgs sometime around March 2013.
-             ,@(maybe-inputs 'inputs
-                             (convert-inputs "nativeBuildInputs"))
-             ,@(maybe-inputs 'propagated-inputs
-                             (convert-inputs "propagatedNativeBuildInputs"))
-
-             (home-page ,(and=> (find-attribute-by-name "homepage" meta)
-                                attribute-value))
-             (synopsis
-              ;; For GNU packages, prefer the official synopsis.
-              ,(or (false-if-exception
-                    (and=> (find (lambda (gnu-package)
-                                   (equal? (gnu-package-name gnu-package)
-                                           name))
-                                 (official-gnu-packages))
-                           gnu-package-doc-summary))
-                   (and=> (find-attribute-by-name "description" meta)
-                          attribute-value)))
-             (description
-              ;; Likewise, prefer the official description of GNU packages.
-              ,(or (false-if-exception
-                    (and=> (find (lambda (gnu-package)
-                                   (equal? (gnu-package-name gnu-package)
-                                           name))
-                                 (official-gnu-packages))
-                           gnu-package-doc-description))
-                   (and=> (find-attribute-by-name "longDescription" meta)
-                          attribute-value)))
-             (license ,(and=> (find-attribute-by-name "license" meta)
-                              (compose license-variable attribute-value))))
-          loc))))))
-
-(define (nixpkgs->guix-package nixpkgs attribute)
-  "Evaluate ATTRIBUTE in NIXPKGS, the file name of a Nixpkgs checkout,
-and return the `package' s-expression corresponding to that package."
-  (let ((port (open-nixpkgs nixpkgs attribute)))
-    (match (xml->snix port)
-      (('snix loc (and drv ('derivation _ ...)))
-       (and (not (pipe-failed? port))
-            (snix-derivation->guix-package drv)))
-      (_
-       (not (pipe-failed? port))))))
-
-;;; snix.scm ends here
diff --git a/guix/scripts/import.scm b/guix/scripts/import.scm
index 98554ef79b..bbd9a3b190 100644
--- a/guix/scripts/import.scm
+++ b/guix/scripts/import.scm
@@ -1,5 +1,5 @@
 ;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2012, 2013, 2014, 2020 Ludovic Courtès <[email-masked]>
+;;; Copyright © 2012, 2013, 2014, 2020, 2021 Ludovic Courtès <[email-masked]>
 ;;; Copyright © 2014 David Thompson <[email-masked]>
 ;;; Copyright © 2018 Kyle Meyer <[email-masked]>
 ;;; Copyright © 2019 Ricardo Wurmus <[email-masked]>
@@ -76,7 +76,7 @@ rather than \\n."
 ;;; Entry point.
 ;;;
 
-(define importers '("gnu" "nix" "pypi" "cpan" "hackage" "stackage" "elpa" "gem"
+(define importers '("gnu" "pypi" "cpan" "hackage" "stackage" "elpa" "gem"
                     "go" "cran" "crate" "texlive" "json" "opam"))
 
 (define (resolve-importer name)
diff --git a/guix/scripts/import/nix.scm b/guix/scripts/import/nix.scm
deleted file mode 100644
index 45ca7e3fcf..0000000000
--- a/guix/scripts/import/nix.scm
+++ /dev/null
@@ -1,90 +0,0 @@
-;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2012, 2013, 2016 Ludovic Courtès <[email-masked]>
-;;; Copyright © 2014 David Thompson <[email-masked]>
-;;;
-;;; This file is part of GNU Guix.
-;;;
-;;; GNU Guix is free software; you can redistribute it and/or modify it
-;;; under the terms of the GNU General Public License as published by
-;;; the Free Software Foundation; either version 3 of the License, or (at
-;;; your option) any later version.
-;;;
-;;; GNU Guix is distributed in the hope that it will be useful, but
-;;; WITHOUT ANY WARRANTY; without even the implied warranty of
-;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-;;; GNU General Public License for more details.
-;;;
-;;; You should have received a copy of the GNU General Public License
-;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
-
-(define-module (guix scripts import nix)
-  #:use-module (guix ui)
-  #:use-module (guix utils)
-  #:use-module (guix scripts)
-  #:use-module (guix import snix)
-  #:use-module (guix scripts import)
-  #:use-module (srfi srfi-1)
-  #:use-module (srfi srfi-11)
-  #:use-module (srfi srfi-37)
-  #:use-module (ice-9 match)
-  #:export (guix-import-nix))
-
-
-;;;
-;;; Command-line options.
-;;;
-
-(define %default-options
-  '())
-
-(define (show-help)
-  (display (G_ "Usage: guix import nix NIXPKGS ATTRIBUTE
-Import and convert the Nix expression ATTRIBUTE of NIXPKGS.\n"))
-  (display (G_ "
-  -h, --help             display this help and exit"))
-  (display (G_ "
-  -V, --version          display version information and exit"))
-  (newline)
-  (show-bug-report-information))
-
-(define %options
-  ;; Specification of the command-line options.
-  (cons* (option '(#\h "help") #f #f
-                 (lambda args
-                   (show-help)
-                   (exit 0)))
-         (option '(#\V "version") #f #f
-                 (lambda args
-                   (show-version-and-exit "guix import nix")))
-         %standard-import-options))
-
-
-;;;
-;;; Entry point.
-;;;
-
-(define (guix-import-nix . args)
-  (define (parse-options)
-    ;; Return the alist of option values.
-    (args-fold* args %options
-                (lambda (opt name arg result)
-                  (leave (G_ "~A: unrecognized option~%") name))
-                (lambda (arg result)
-                  (alist-cons 'argument arg result))
-                %default-options))
-
-  (let* ((opts (parse-options))
-         (args (filter-map (match-lambda
-                            (('argument . value)
-                             value)
-                            (_ #f))
-                           (reverse opts))))
-    (match args
-      ((nixpkgs attribute)
-       (let-values (((expr loc)
-                     (nixpkgs->guix-package nixpkgs attribute)))
-         (format #t ";; converted from ~a:~a~%~%"
-                 (location-file loc) (location-line loc))
-         expr))
-      (x
-       (leave (G_ "wrong number of arguments~%"))))))
diff --git a/tests/snix.scm b/tests/snix.scm
deleted file mode 100644
index 4c31e3389d..0000000000
--- a/tests/snix.scm
+++ /dev/null
@@ -1,73 +0,0 @@
-;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2012, 2013, 2015 Ludovic Courtès <[email-masked]>
-;;;
-;;; This file is part of GNU Guix.
-;;;
-;;; GNU Guix is free software; you can redistribute it and/or modify it
-;;; under the terms of the GNU General Public License as published by
-;;; the Free Software Foundation; either version 3 of the License, or (at
-;;; your option) any later version.
-;;;
-;;; GNU Guix is distributed in the hope that it will be useful, but
-;;; WITHOUT ANY WARRANTY; without even the implied warranty of
-;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-;;; GNU General Public License for more details.
-;;;
-;;; You should have received a copy of the GNU General Public License
-;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
-
-(define-module (test-snix)
-  #:use-module (guix import snix)
-  #:use-module (srfi srfi-1)
-  #:use-module (srfi srfi-64)
-  #:use-module (ice-9 match))
-
-(define %nixpkgs-directory
-  (getenv "NIXPKGS"))
-
-(define factorize-uri
-  (@@ (guix import snix) factorize-uri))
-
-(define-syntax-rule (every? proc lists ...)
-  (not (not (every proc lists ...))))
-
-(test-begin "snix")
-
-(test-assert "factorize-uri"
-  (every? (match-lambda
-           ((uri version '-> expected)
-            (equal? (factorize-uri uri version)
-                    expected)))
-          '(("http://example.com/foo.tgz" "1.0"
-             -> "http://example.com/foo.tgz")
-            ("http://example.com/foo-2.8.tgz" "2.8"
-             -> ("http://example.com/foo-" version ".tgz"))
-            ("http://example.com/2.8/foo-2.8.tgz" "2.8"
-             -> ("http://example.com/" version "/foo-" version ".tgz")))))
-
-(test-skip (if (and %nixpkgs-directory
-                    (file-exists? (string-append %nixpkgs-directory
-                                                 "/default.nix")))
-               0
-               1))
-
-(test-assert "nixpkgs->guix-package"
-  (match (nixpkgs->guix-package %nixpkgs-directory "guile")
-    (('package
-       ('name "guile")
-       ('version (? string?))
-       ('source ('origin _ ...))
-       ('build-system _)
-       ('inputs ('quasiquote (inputs ...)))
-       ('propagated-inputs ('quasiquote (pinputs ...)))
-       ('home-page (? string?))
-       ('synopsis (? string?))
-       ('description (? string?))
-       ('license (? symbol?)))
-     (and (member '("libffi" ,libffi) inputs)
-          (member '("gmp" ,gmp) pinputs)
-          #t))
-    (x
-     (pk 'fail x #f))))
-
-(test-end "snix")
-- 
2.31.1