74 lines
2.9 KiB
Scheme
74 lines
2.9 KiB
Scheme
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;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2018 Ludovic Courtès <ludo@gnu.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (guix describe)
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#:use-module (guix memoization)
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#:use-module (guix profiles)
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#:use-module (srfi srfi-1)
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#:use-module (ice-9 match)
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#:export (package-path-entries))
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;;; Commentary:
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;;;
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;;; This module provides supporting code to allow a Guix instance to find, at
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;;; run time, which profile it's in (profiles created by 'guix pull'). That
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;;; allows it to read meta-information about itself (e.g., repository URL and
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;;; commit ID) and to find other channels available in the same profile. It's
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;;; a bit like ELPA's pkg-info.el.
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;;;
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;;; Code:
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(define current-profile
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(mlambda ()
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"Return the profile (created by 'guix pull') the calling process lives in,
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or #f if this is not applicable."
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(match (command-line)
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((program . _)
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(and (string-suffix? "/bin/guix" program)
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;; Note: We want to do _lexical dot-dot resolution_. Using ".."
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;; for real would instead take us into the /gnu/store directory
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;; that ~/.config/guix/current/bin points to, whereas we want to
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;; obtain ~/.config/guix/current.
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(let ((candidate (dirname (dirname program))))
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(and (file-exists? (string-append candidate "/manifest"))
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candidate)))))))
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(define current-profile-entries
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(mlambda ()
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"Return the list of entries in the 'guix pull' profile the calling process
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lives in, or #f if this is not applicable."
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(match (current-profile)
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(#f '())
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(profile
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(let ((manifest (profile-manifest profile)))
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(manifest-entries manifest))))))
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(define package-path-entries
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(mlambda ()
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"Return a list of package path entries to be added to the package search
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path. These entries are taken from the 'guix pull' profile the calling
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process lives in, when applicable."
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;; Filter out Guix itself.
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(filter-map (lambda (entry)
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(and (not (string=? (manifest-entry-name entry)
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"guix"))
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(string-append (manifest-entry-item entry)
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"/share/guile/site/"
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(effective-version))))
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(current-profile-entries))))
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