146 lines
6 KiB
Scheme
146 lines
6 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2018, 2019 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 (guix packages)
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#:use-module ((guix utils) #:select (location-file))
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#:use-module ((guix store) #:select (%store-prefix store-path?))
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#:use-module ((guix config) #:select (%state-directory))
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#:use-module (srfi srfi-1)
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#:use-module (ice-9 match)
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#:export (current-profile
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current-profile-date
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current-profile-entries
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package-path-entries
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package-provenance))
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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-date)
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"Return the creation date of the current profile (produced by 'guix pull'),
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as a number of seconds since the Epoch, or #f if it could not be determined."
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;; Normally 'current-profile' will return ~/.config/guix/current. We need
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;; to 'readlink' once to get '/var/guix/…/guix-profile', whose mtime is the
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;; piece of information we're looking for.
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(let loop ((profile (current-profile)))
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(match profile
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(#f #f)
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((? store-path?) #f)
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(file
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(if (string-prefix? %state-directory file)
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(and=> (lstat file) stat:mtime)
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(catch 'system-error
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(lambda ()
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(let ((target (readlink file)))
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(loop (if (string-prefix? "/" target)
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target
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(string-append (dirname file) "/" target)))))
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(const #f)))))))
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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 current-channel-entries
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(mlambda ()
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"Return manifest entries corresponding to extra channels--i.e., not the
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'guix' channel."
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(remove (lambda (entry)
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(string=? (manifest-entry-name entry) "guix"))
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(current-profile-entries))))
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(define (package-path-entries)
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"Return two values: the list of package path entries to be added to the
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package search path, and the list to be added to %LOAD-COMPILED-PATH. These
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entries are taken from the 'guix pull' profile the calling process lives in,
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when applicable."
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;; Filter out Guix itself.
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(unzip2 (map (lambda (entry)
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(list (string-append (manifest-entry-item entry)
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"/share/guile/site/"
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(effective-version))
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(string-append (manifest-entry-item entry)
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"/lib/guile/" (effective-version)
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"/site-ccache")))
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(current-channel-entries))))
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(define (package-provenance package)
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"Return the provenance of PACKAGE as an sexp for use as the 'provenance'
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property of manifest entries, or #f if it could not be determined."
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(define (entry-source entry)
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(match (assq 'source
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(manifest-entry-properties entry))
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(('source value) value)
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(_ #f)))
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(match (and=> (package-location package) location-file)
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(#f #f)
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(file
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(let ((file (if (string-prefix? "/" file)
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file
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(search-path %load-path file))))
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(and file
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(string-prefix? (%store-prefix) file)
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;; Always store information about the 'guix' channel and
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;; optionally about the specific channel FILE comes from.
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(or (let ((main (and=> (find (lambda (entry)
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(string=? "guix"
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(manifest-entry-name entry)))
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(current-profile-entries))
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entry-source))
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(extra (any (lambda (entry)
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(let ((item (manifest-entry-item entry)))
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(and (string-prefix? item file)
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(entry-source entry))))
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(current-profile-entries))))
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(and main
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`(,main
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,@(if extra (list extra) '()))))))))))
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