import: Remove Nix importer.

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.

1 files changed, 0 insertions, 17 deletions

diff --git a/configure.ac b/configure.ac
index 7c1b9ef8dd7..f8b9376c1f0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -202,23 +202,6 @@ 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"