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
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
|
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013, 2014, 2015, 2016, 2017, 2018 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2016 Chris Marusich <cmmarusich@gmail.com>
;;;
;;; 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 (gnu build install)
#:use-module (guix store database)
#:use-module (guix build utils)
#:use-module (guix build store-copy)
#:use-module (srfi srfi-26)
#:use-module (ice-9 match)
#:export (install-boot-config
evaluate-populate-directive
populate-root-file-system
reset-timestamps
register-closure
populate-single-profile-directory))
;;; Commentary:
;;;
;;; This module supports the installation of the GNU system on a hard disk.
;;; It is meant to be used both in a build environment (in derivations that
;;; build VM images), and on the bare metal (when really installing the
;;; system.)
;;;
;;; Code:
(define (install-boot-config bootcfg bootcfg-location mount-point)
"Atomically copy BOOTCFG into BOOTCFG-LOCATION on the MOUNT-POINT. Note
that the caller must make sure that BOOTCFG is registered as a GC root so
that the fonts, background images, etc. referred to by BOOTCFG are not GC'd."
(let* ((target (string-append mount-point bootcfg-location))
(pivot (string-append target ".new")))
(mkdir-p (dirname target))
;; Copy BOOTCFG instead of just symlinking it, because symlinks won't
;; work when /boot is on a separate partition. Do that atomically.
(copy-file bootcfg pivot)
(rename-file pivot target)))
(define (evaluate-populate-directive directive target)
"Evaluate DIRECTIVE, an sexp describing a file or directory to create under
directory TARGET."
(let loop ((directive directive))
(catch 'system-error
(lambda ()
(match directive
(('directory name)
(mkdir-p (string-append target name)))
(('directory name uid gid)
(let ((dir (string-append target name)))
(mkdir-p dir)
(chown dir uid gid)))
(('directory name uid gid mode)
(loop `(directory ,name ,uid ,gid))
(chmod (string-append target name) mode))
((new '-> old)
(let try ()
(catch 'system-error
(lambda ()
(symlink old (string-append target new)))
(lambda args
;; When doing 'guix system init' on the current '/', some
;; symlinks may already exists. Override them.
(if (= EEXIST (system-error-errno args))
(begin
(delete-file (string-append target new))
(try))
(apply throw args))))))))
(lambda args
;; Usually we can only get here when installing to an existing root,
;; as with 'guix system init foo.scm /'.
(format (current-error-port)
"error: failed to evaluate directive: ~s~%"
directive)
(apply throw args)))))
(define (directives store)
"Return a list of directives to populate the root file system that will host
STORE."
`(;; Note: the store's GID is fixed precisely so we can set it here rather
;; than at activation time.
(directory ,store 0 30000 #o1775)
(directory "/etc")
(directory "/var/log") ; for shepherd
(directory "/var/guix/gcroots")
(directory "/var/empty") ; for no-login accounts
(directory "/var/db") ; for dhclient, etc.
(directory "/var/run")
(directory "/run")
(directory "/mnt")
(directory "/var/guix/profiles/per-user/root" 0 0)
;; Link to the initial system generation.
("/var/guix/profiles/system" -> "system-1-link")
("/var/guix/gcroots/booted-system" -> "/run/booted-system")
("/var/guix/gcroots/current-system" -> "/run/current-system")
;; XXX: 'guix-register' creates this symlink with a wrong target, so
;; create it upfront to be sure.
("/var/guix/gcroots/profiles" -> "/var/guix/profiles")
(directory "/bin")
(directory "/tmp" 0 0 #o1777) ; sticky bit
(directory "/var/tmp" 0 0 #o1777)
(directory "/var/lock" 0 0 #o1777)
(directory "/root" 0 0) ; an exception
(directory "/home" 0 0)))
(define (populate-root-file-system system target)
"Make the essential non-store files and directories on TARGET. This
includes /etc, /var, /run, /bin/sh, etc., and all the symlinks to SYSTEM."
(for-each (cut evaluate-populate-directive <> target)
(directives (%store-directory)))
;; Add system generation 1.
(let ((generation-1 (string-append target
"/var/guix/profiles/system-1-link")))
(let try ()
(catch 'system-error
(lambda ()
(symlink system generation-1))
(lambda args
;; If GENERATION-1 already exists, overwrite it.
(if (= EEXIST (system-error-errno args))
(begin
(delete-file generation-1)
(try))
(apply throw args)))))))
(define (reset-timestamps directory)
"Reset the timestamps of all the files under DIRECTORY, so that they appear
as created and modified at the Epoch."
(display "clearing file timestamps...\n")
(for-each (lambda (file)
(let ((s (lstat file)))
;; XXX: Guile uses libc's 'utime' function (not 'futime'), so
;; the timestamp of symlinks cannot be changed, and there are
;; symlinks here pointing to /gnu/store, which is the host,
;; read-only store.
(unless (eq? (stat:type s) 'symlink)
(utime file 0 0 0 0))))
(find-files directory #:directories? #t)))
(define* (register-closure prefix closure
#:key
(deduplicate? #t) (reset-timestamps? #t)
(schema (sql-schema)))
"Register CLOSURE in PREFIX, where PREFIX is the directory name of the
target store and CLOSURE is the name of a file containing a reference graph as
produced by #:references-graphs.. As a side effect, if RESET-TIMESTAMPS? is
true, reset timestamps on store files and, if DEDUPLICATE? is true,
deduplicates files common to CLOSURE and the rest of PREFIX."
(let ((items (call-with-input-file closure read-reference-graph)))
(register-items items
#:prefix prefix
#:deduplicate? deduplicate?
#:reset-timestamps? reset-timestamps?
#:schema schema)))
(define* (populate-single-profile-directory directory
#:key profile closure
deduplicate?
register? schema)
"Populate DIRECTORY with a store containing PROFILE, whose closure is given
in the file called CLOSURE (as generated by #:references-graphs.) DIRECTORY
is initialized to contain a single profile under /root pointing to PROFILE.
When REGISTER? is true, initialize DIRECTORY/var/guix/db to reflect the
contents of the store; DEDUPLICATE? determines whether to deduplicate files in
the store.
This is used to create the self-contained tarballs with 'guix pack'."
(define (scope file)
(string-append directory "/" file))
(define %root-profile
"/var/guix/profiles/per-user/root")
(define (mkdir-p* dir)
(mkdir-p (scope dir)))
(define (symlink* old new)
(symlink old (scope new)))
;; Populate the store.
(populate-store (list closure) directory)
(when register?
(register-closure (canonicalize-path directory) closure
#:deduplicate? deduplicate?
#:schema schema)
(mkdir-p* "/var/guix/profiles")
(mkdir-p* "/var/guix/gcroots")
(symlink* "/var/guix/profiles"
"/var/guix/gcroots/profiles"))
;; Make root's profile, which makes it a GC root.
(mkdir-p* %root-profile)
(symlink* profile
(string-append %root-profile "/guix-profile-1-link"))
(symlink* (string-append %root-profile "/guix-profile-1-link")
(string-append %root-profile "/guix-profile"))
(mkdir-p* "/root")
(symlink* (string-append %root-profile "/guix-profile")
"/root/.guix-profile"))
;;; install.scm ends here
|