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bug#22629: [PATCH 2/3] Add (guix describe) and use it to initialize '%pa
From: |
Ludovic Courtès |
Subject: |
bug#22629: [PATCH 2/3] Add (guix describe) and use it to initialize '%package-search-path'. |
Date: |
Tue, 28 Aug 2018 17:17:50 +0200 |
* guix/describe.scm: New file.
* Makefile.am (MODULES): Add it.
* gnu/packages.scm (%package-module-path): Honor 'package-path-entries'.
---
Makefile.am | 1 +
gnu/packages.scm | 22 ++++++++------
guix/describe.scm | 73 +++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 88 insertions(+), 8 deletions(-)
create mode 100644 guix/describe.scm
diff --git a/Makefile.am b/Makefile.am
index 324674a60..b6efd6d62 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -86,6 +86,7 @@ MODULES = \
guix/derivations.scm \
guix/grafts.scm \
guix/inferior.scm \
+ guix/describe.scm \
guix/gnu-maintenance.scm \
guix/self.scm \
guix/upstream.scm \
diff --git a/gnu/packages.scm b/gnu/packages.scm
index 7b954769e..e690d459f 100644
--- a/gnu/packages.scm
+++ b/gnu/packages.scm
@@ -30,6 +30,7 @@
#:select ((package-name->name+version
. hyphen-separated-name->name+version)))
#:autoload (guix profiles) (packages->manifest)
+ #:use-module (guix describe)
#:use-module (ice-9 vlist)
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
@@ -136,16 +137,21 @@ for system '~a'")
;; to narrow the search.
(let* ((not-colon (char-set-complement (char-set #\:)))
(environment (string-tokenize (or (getenv "GUIX_PACKAGE_PATH") "")
- not-colon)))
- ;; Automatically add items from $GUIX_PACKAGE_PATH to Guile's search path.
- (for-each (lambda (directory)
- (set! %load-path (cons directory %load-path))
- (set! %load-compiled-path
- (cons directory %load-compiled-path)))
- environment)
+ not-colon))
+ (channels (package-path-entries)))
+ ;; Automatically add channels and items from $GUIX_PACKAGE_PATH to Guile's
+ ;; search path. For historical reasons, $GUIX_PACKAGE_PATH goes to the
+ ;; front; channels go to the back so that they don't override Guix' own
+ ;; modules.
+ (set! %load-path
+ (append environment %load-path channels))
+ (set! %load-compiled-path
+ (append environment %load-compiled-path channels))
(make-parameter
- (append environment `((,%distro-root-directory . "gnu/packages"))))))
+ (append environment
+ `((,%distro-root-directory . "gnu/packages"))
+ channels))))
(define %patch-path
;; Define it after '%package-module-path' so that '%load-path' contains user
diff --git a/guix/describe.scm b/guix/describe.scm
new file mode 100644
index 000000000..3122a762f
--- /dev/null
+++ b/guix/describe.scm
@@ -0,0 +1,73 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2018 Ludovic Courtès <address@hidden>
+;;;
+;;; 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 describe)
+ #:use-module (guix memoization)
+ #:use-module (guix profiles)
+ #:use-module (srfi srfi-1)
+ #:use-module (ice-9 match)
+ #:export (package-path-entries))
+
+;;; Commentary:
+;;;
+;;; This module provides supporting code to allow a Guix instance to find, at
+;;; run time, which profile it's in (profiles created by 'guix pull'). That
+;;; allows it to read meta-information about itself (e.g., repository URL and
+;;; commit ID) and to find other channels available in the same profile. It's
+;;; a bit like ELPA's pkg-info.el.
+;;;
+;;; Code:
+
+(define current-profile
+ (mlambda ()
+ "Return the profile (created by 'guix pull') the calling process lives in,
+or #f if this is not applicable."
+ (match (command-line)
+ ((program . _)
+ (and (string-suffix? "/bin/guix" program)
+ ;; Note: We want to do _lexical dot-dot resolution_. Using ".."
+ ;; for real would instead take us into the /gnu/store directory
+ ;; that ~/.config/guix/current/bin points to, whereas we want to
+ ;; obtain ~/.config/guix/current.
+ (let ((candidate (dirname (dirname program))))
+ (and (file-exists? (string-append candidate "/manifest"))
+ candidate)))))))
+
+(define current-profile-entries
+ (mlambda ()
+ "Return the list of entries in the 'guix pull' profile the calling process
+lives in, or #f if this is not applicable."
+ (match (current-profile)
+ (#f '())
+ (profile
+ (let ((manifest (profile-manifest profile)))
+ (manifest-entries manifest))))))
+
+(define package-path-entries
+ (mlambda ()
+ "Return a list of package path entries to be added to the package search
+path. These entries are taken from the 'guix pull' profile the calling
+process lives in, when applicable."
+ ;; Filter out Guix itself.
+ (filter-map (lambda (entry)
+ (and (not (string=? (manifest-entry-name entry)
+ "guix"))
+ (string-append (manifest-entry-item entry)
+ "/share/guile/site/"
+ (effective-version))))
+ (current-profile-entries))))
--
2.18.0