GNU bug report logs - #57317
[PATCH 0/2] Implicitly set GUIX_EXTENSIONS_PATH in profiles.

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From: "(" <paren <at> disroot.org>
To: 57317 <at> debbugs.gnu.org
Cc: "\(" <paren <at> disroot.org>
Subject: [bug#57317] [PATCH v2 1/2] build: profiles: Implicitly set GUIX_EXTENSIONS_PATH.
Date: Sun, 21 Aug 2022 16:43:48 +0100

* guix/build/profiles.scm (manifest-sexp->inputs+search-paths):
  Always return a search path for GUIX_EXTENSIONS_PATH.
* guix/search-paths.scm ($GUIX_EXTENSIONS_PATH): New variable.

This allows Guix to find extensions without any need for users to
set GUIX_EXTENSIONS_PATH manually.
---
 guix/build/profiles.scm |  7 ++++---
 guix/search-paths.scm   | 11 +++++++++++
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/guix/build/profiles.scm b/guix/build/profiles.scm
index 0c92f222b4..b19d93f971 100644
--- a/guix/build/profiles.scm
+++ b/guix/build/profiles.scm
@@ -179,9 +179,10 @@ (define-syntax let-fields
          (()
           (values (reverse inputs)
                   (delete-duplicates
-                   (cons $PATH
-                         (map sexp->search-path-specification
-                              (reverse search-paths)))))))))))
+                   (cons* $PATH
+                          $GUIX_EXTENSIONS_PATH
+                          (map sexp->search-path-specification
+                               (reverse search-paths)))))))))))
 
 (define* (build-profile output manifest
                         #:key (extra-inputs '()) (symlink symlink))
diff --git a/guix/search-paths.scm b/guix/search-paths.scm
index 6b13a98946..5a0cddac8f 100644
--- a/guix/search-paths.scm
+++ b/guix/search-paths.scm
@@ -33,6 +33,7 @@ (define-module (guix search-paths)
             search-path-specification-file-pattern
 
             $PATH
+            $GUIX_EXTENSIONS_PATH
             $SSL_CERT_DIR
             $SSL_CERT_FILE
 
@@ -73,6 +74,16 @@ (define $PATH
    (variable "PATH")
    (files '("bin" "sbin"))))
 
+(define-public $GUIX_EXTENSIONS_PATH
+  ;; 'GUIX_EXTENSIONS_PATH' is used by Guix to locate extension commands.
+  ;; Like 'PATH', it's not attached to any package, so that users don't have
+  ;; to install the 'guix' package (which is not supposed to be installed,
+  ;; as it will mess up the 'guix pull' installation) or set the variable
+  ;; manually.
+  (search-path-specification
+   (variable "GUIX_EXTENSIONS_PATH")
+   (files '("share/guix/extensions"))))
+
 ;; Two variables for certificates (see (guix)X.509 Certificates),
 ;; respected by 'openssl', possibly GnuTLS in the future
 ;; (https://gitlab.com/gnutls/gnutls/-/merge_requests/1541)
-- 
2.37.2

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