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1 | ;;; GNU Guix --- Functional package management for GNU |
2 | ;;; Copyright © 2018 Ludovic Courtès <ludo@gnu.org> | |
3 | ;;; | |
4 | ;;; This file is part of GNU Guix. | |
5 | ;;; | |
6 | ;;; GNU Guix is free software; you can redistribute it and/or modify it | |
7 | ;;; under the terms of the GNU General Public License as published by | |
8 | ;;; the Free Software Foundation; either version 3 of the License, or (at | |
9 | ;;; your option) any later version. | |
10 | ;;; | |
11 | ;;; GNU Guix is distributed in the hope that it will be useful, but | |
12 | ;;; WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | ;;; GNU General Public License for more details. | |
15 | ;;; | |
16 | ;;; You should have received a copy of the GNU General Public License | |
17 | ;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>. | |
18 | ||
19 | (define-module (guix describe) | |
20 | #:use-module (guix memoization) | |
21 | #:use-module (guix profiles) | |
22 | #:use-module (srfi srfi-1) | |
23 | #:use-module (ice-9 match) | |
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24 | #:export (current-profile |
25 | current-profile-entries | |
26 | package-path-entries)) | |
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27 | |
28 | ;;; Commentary: | |
29 | ;;; | |
30 | ;;; This module provides supporting code to allow a Guix instance to find, at | |
31 | ;;; run time, which profile it's in (profiles created by 'guix pull'). That | |
32 | ;;; allows it to read meta-information about itself (e.g., repository URL and | |
33 | ;;; commit ID) and to find other channels available in the same profile. It's | |
34 | ;;; a bit like ELPA's pkg-info.el. | |
35 | ;;; | |
36 | ;;; Code: | |
37 | ||
38 | (define current-profile | |
39 | (mlambda () | |
40 | "Return the profile (created by 'guix pull') the calling process lives in, | |
41 | or #f if this is not applicable." | |
42 | (match (command-line) | |
43 | ((program . _) | |
44 | (and (string-suffix? "/bin/guix" program) | |
45 | ;; Note: We want to do _lexical dot-dot resolution_. Using ".." | |
46 | ;; for real would instead take us into the /gnu/store directory | |
47 | ;; that ~/.config/guix/current/bin points to, whereas we want to | |
48 | ;; obtain ~/.config/guix/current. | |
49 | (let ((candidate (dirname (dirname program)))) | |
50 | (and (file-exists? (string-append candidate "/manifest")) | |
51 | candidate))))))) | |
52 | ||
53 | (define current-profile-entries | |
54 | (mlambda () | |
55 | "Return the list of entries in the 'guix pull' profile the calling process | |
56 | lives in, or #f if this is not applicable." | |
57 | (match (current-profile) | |
58 | (#f '()) | |
59 | (profile | |
60 | (let ((manifest (profile-manifest profile))) | |
61 | (manifest-entries manifest)))))) | |
62 | ||
63 | (define package-path-entries | |
64 | (mlambda () | |
65 | "Return a list of package path entries to be added to the package search | |
66 | path. These entries are taken from the 'guix pull' profile the calling | |
67 | process lives in, when applicable." | |
68 | ;; Filter out Guix itself. | |
69 | (filter-map (lambda (entry) | |
70 | (and (not (string=? (manifest-entry-name entry) | |
71 | "guix")) | |
72 | (string-append (manifest-entry-item entry) | |
73 | "/share/guile/site/" | |
74 | (effective-version)))) | |
75 | (current-profile-entries)))) |