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fe634eaf | 1 | ;;; GNU Guix --- Functional package management for GNU |
2cb658a9 | 2 | ;;; Copyright © 2018, 2019 Ludovic Courtès <ludo@gnu.org> |
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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) | |
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22 | #:use-module (guix packages) |
23 | #:use-module ((guix utils) #:select (location-file)) | |
24 | #:use-module ((guix store) #:select (%store-prefix)) | |
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25 | #:use-module (srfi srfi-1) |
26 | #:use-module (ice-9 match) | |
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27 | #:export (current-profile |
28 | current-profile-entries | |
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29 | package-path-entries |
30 | ||
31 | package-provenance)) | |
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32 | |
33 | ;;; Commentary: | |
34 | ;;; | |
35 | ;;; This module provides supporting code to allow a Guix instance to find, at | |
36 | ;;; run time, which profile it's in (profiles created by 'guix pull'). That | |
37 | ;;; allows it to read meta-information about itself (e.g., repository URL and | |
38 | ;;; commit ID) and to find other channels available in the same profile. It's | |
39 | ;;; a bit like ELPA's pkg-info.el. | |
40 | ;;; | |
41 | ;;; Code: | |
42 | ||
43 | (define current-profile | |
44 | (mlambda () | |
45 | "Return the profile (created by 'guix pull') the calling process lives in, | |
46 | or #f if this is not applicable." | |
47 | (match (command-line) | |
48 | ((program . _) | |
49 | (and (string-suffix? "/bin/guix" program) | |
50 | ;; Note: We want to do _lexical dot-dot resolution_. Using ".." | |
51 | ;; for real would instead take us into the /gnu/store directory | |
52 | ;; that ~/.config/guix/current/bin points to, whereas we want to | |
53 | ;; obtain ~/.config/guix/current. | |
54 | (let ((candidate (dirname (dirname program)))) | |
55 | (and (file-exists? (string-append candidate "/manifest")) | |
56 | candidate))))))) | |
57 | ||
58 | (define current-profile-entries | |
59 | (mlambda () | |
60 | "Return the list of entries in the 'guix pull' profile the calling process | |
61 | lives in, or #f if this is not applicable." | |
62 | (match (current-profile) | |
63 | (#f '()) | |
64 | (profile | |
65 | (let ((manifest (profile-manifest profile))) | |
66 | (manifest-entries manifest)))))) | |
67 | ||
68 | (define package-path-entries | |
69 | (mlambda () | |
70 | "Return a list of package path entries to be added to the package search | |
71 | path. These entries are taken from the 'guix pull' profile the calling | |
72 | process lives in, when applicable." | |
73 | ;; Filter out Guix itself. | |
74 | (filter-map (lambda (entry) | |
75 | (and (not (string=? (manifest-entry-name entry) | |
76 | "guix")) | |
77 | (string-append (manifest-entry-item entry) | |
78 | "/share/guile/site/" | |
79 | (effective-version)))) | |
80 | (current-profile-entries)))) | |
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81 | |
82 | (define (package-provenance package) | |
83 | "Return the provenance of PACKAGE as an sexp for use as the 'provenance' | |
84 | property of manifest entries, or #f if it could not be determined." | |
85 | (define (entry-source entry) | |
86 | (match (assq 'source | |
87 | (manifest-entry-properties entry)) | |
88 | (('source value) value) | |
89 | (_ #f))) | |
90 | ||
91 | (match (and=> (package-location package) location-file) | |
92 | (#f #f) | |
93 | (file | |
94 | (let ((file (if (string-prefix? "/" file) | |
95 | file | |
96 | (search-path %load-path file)))) | |
97 | (and file | |
98 | (string-prefix? (%store-prefix) file) | |
99 | ||
100 | ;; Always store information about the 'guix' channel and | |
101 | ;; optionally about the specific channel FILE comes from. | |
102 | (or (let ((main (and=> (find (lambda (entry) | |
103 | (string=? "guix" | |
104 | (manifest-entry-name entry))) | |
105 | (current-profile-entries)) | |
106 | entry-source)) | |
107 | (extra (any (lambda (entry) | |
108 | (let ((item (manifest-entry-item entry))) | |
109 | (and (string-prefix? item file) | |
110 | (entry-source entry)))) | |
111 | (current-profile-entries)))) | |
112 | (and main | |
113 | `(,main | |
114 | ,@(if extra (list extra) '())))))))))) |