1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
| | ;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2018, 2019, 2020 Ludovic Courtès <ludo@gnu.org>
;;;
;;; 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 (guix packages)
#:use-module ((guix utils) #:select (location-file))
#:use-module ((guix store) #:select (%store-prefix store-path?))
#:use-module ((guix config) #:select (%state-directory))
#:use-module (srfi srfi-1)
#:use-module (ice-9 match)
#:export (current-profile
current-profile-date
current-profile-entries
package-path-entries
package-provenance
manifest-entry-with-provenance))
;;; 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 initial-program-arguments
;; Save the initial program arguments. This allows us to see the "real"
;; 'guix' program, even if 'guix repl -s' calls 'set-program-arguments'
;; later on.
(program-arguments))
(define current-profile
(mlambda ()
"Return the profile (created by 'guix pull') the calling process lives in,
or #f if this is not applicable."
(match initial-program-arguments
((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-date)
"Return the creation date of the current profile (produced by 'guix pull'),
as a number of seconds since the Epoch, or #f if it could not be determined."
;; Normally 'current-profile' will return ~/.config/guix/current. We need
;; to 'readlink' once to get '/var/guix/…/guix-profile', whose mtime is the
;; piece of information we're looking for.
(let loop ((profile (current-profile)))
(match profile
(#f #f)
((? store-path?) #f)
(file
(if (string-prefix? %state-directory file)
(and=> (lstat file) stat:mtime)
(catch 'system-error
(lambda ()
(let ((target (readlink file)))
(loop (if (string-prefix? "/" target)
target
(string-append (dirname file) "/" target)))))
(const #f)))))))
(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 current-channel-entries
(mlambda ()
"Return manifest entries corresponding to extra channels--i.e., not the
'guix' channel."
(remove (lambda (entry)
(string=? (manifest-entry-name entry) "guix"))
(current-profile-entries))))
(define (package-path-entries)
"Return two values: the list of package path entries to be added to the
package search path, and the list to be added to %LOAD-COMPILED-PATH. These
entries are taken from the 'guix pull' profile the calling process lives in,
when applicable."
;; Filter out Guix itself.
(unzip2 (map (lambda (entry)
(list (string-append (manifest-entry-item entry)
"/share/guile/site/"
(effective-version))
(string-append (manifest-entry-item entry)
"/lib/guile/" (effective-version)
"/site-ccache")))
(current-channel-entries))))
(define (package-provenance package)
"Return the provenance of PACKAGE as an sexp for use as the 'provenance'
property of manifest entries, or #f if it could not be determined."
(define (entry-source entry)
(match (assq 'source
(manifest-entry-properties entry))
(('source value) value)
(_ #f)))
(match (and=> (package-location package) location-file)
(#f #f)
(file
(let ((file (if (string-prefix? "/" file)
file
(and=> (search-path %load-path file) canonicalize-path))))
(and file
(string-prefix? (%store-prefix) file)
;; Always store information about the 'guix' channel and
;; optionally about the specific channel FILE comes from.
(let ((main (and=> (find (lambda (entry)
(string=? "guix"
(manifest-entry-name entry)))
(current-profile-entries))
entry-source))
(extra (any (lambda (entry)
(let ((item (manifest-entry-item entry)))
(and (string-prefix? item file)
(entry-source entry))))
(current-profile-entries))))
(and main
`(,main
,@(if extra (list extra) '())))))))))
(define (manifest-entry-with-provenance entry)
"Return ENTRY with an additional 'provenance' property if it's not already
there."
(let ((properties (manifest-entry-properties entry)))
(if (assq 'properties properties)
entry
(let ((item (manifest-entry-item entry)))
(manifest-entry
(inherit entry)
(properties
(match (and (package? item) (package-provenance item))
(#f properties)
(sexp `((provenance ,@sexp)
,@properties)))))))))
|