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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2015 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 build profiles)
#:use-module (guix build union)
#:use-module (guix build utils)
#:use-module (guix search-paths)
#:use-module (srfi srfi-26)
#:use-module (ice-9 ftw)
#:use-module (ice-9 match)
#:use-module (ice-9 pretty-print)
#:export (ensure-writable-directory
build-profile))
;;; Commentary:
;;;
;;; Build a user profile (essentially the union of all the installed packages)
;;; with its associated meta-data.
;;;
;;; Code:
(define (abstract-profile profile)
"Return a procedure that replaces PROFILE in VALUE with a reference to the
'GUIX_PROFILE' environment variable. This allows users to specify what the
user-friendly name of the profile is, for instance ~/.guix-profile rather than
/gnu/store/...-profile."
(let ((replacement (string-append "${GUIX_PROFILE:-" profile "}")))
(match-lambda
((search-path . value)
(let* ((separator (search-path-specification-separator search-path))
(items (string-tokenize* value separator))
(crop (cute string-drop <> (string-length profile))))
(cons search-path
(string-join (map (lambda (str)
(string-append replacement (crop str)))
items)
separator)))))))
(define (write-environment-variable-definition port)
"Write the given environment variable definition to PORT."
(match-lambda
((search-path . value)
(display (search-path-definition search-path value #:kind 'prefix)
port)
(newline port))))
(define (build-etc/profile output search-paths)
"Build the 'OUTPUT/etc/profile' shell file containing environment variable
definitions for all the SEARCH-PATHS."
(mkdir-p (string-append output "/etc"))
(call-with-output-file (string-append output "/etc/profile")
(lambda (port)
;; The use of $GUIX_PROFILE described below is not great. Another
;; option would have been to use "$1" and have users run:
;;
;; source ~/.guix-profile/etc/profile ~/.guix-profile
;;
;; However, when 'source' is used with no arguments, $1 refers to the
;; first positional parameter of the calling scripts, so we can rely on
;; it.
(display "\
# Source this file to define all the relevant environment variables in Bash
# for this profile. You may want to define the 'GUIX_PROFILE' environment
# variable to point to the \"visible\" name of the profile, like this:
#
# GUIX_PROFILE=/path/to/profile
# source /path/to/profile/etc/profile
#
# When GUIX_PROFILE is undefined, the various environment variables refer
# to this specific profile generation.
\n" port)
(let ((variables (evaluate-search-paths (cons $PATH search-paths)
(list output))))
(for-each (write-environment-variable-definition port)
(map (abstract-profile output) variables))))))
(define (ensure-writable-directory directory)
"Ensure DIRECTORY exists and is writable. If DIRECTORY is currently a
symlink (to a read-only directory in the store), then delete the symlink and
instead make DIRECTORY a \"real\" directory containing symlinks."
(define (unsymlink link)
(let* ((target (readlink link))
;; TARGET might itself be a symlink, so append "/" to make sure
;; 'scandir' enters it.
(files (scandir (string-append target "/")
(negate (cut member <> '("." ".."))))))
(delete-file link)
(mkdir link)
(for-each (lambda (file)
(symlink (string-append target "/" file)
(string-append link "/" file)))
files)))
(catch 'system-error
(lambda ()
(mkdir directory))
(lambda args
(let ((errno (system-error-errno args)))
(if (= errno EEXIST)
(let ((stat (lstat directory)))
(case (stat:type stat)
((symlink)
;; "Unsymlink" DIRECTORY so that it is writable.
(unsymlink directory))
((directory)
#t)
(else
(error "cannot mkdir because a same-named file exists"
directory))))
(apply throw args))))))
(define* (build-profile output inputs
#:key manifest search-paths)
"Build a user profile from INPUTS in directory OUTPUT. Write MANIFEST, an
sexp, to OUTPUT/manifest. Create OUTPUT/etc/profile with Bash definitions for
-all the variables listed in SEARCH-PATHS."
;; Make the symlinks.
(union-build output inputs
#:log-port (%make-void-port "w"))
;; Store meta-data.
(call-with-output-file (string-append output "/manifest")
(lambda (p)
(pretty-print manifest p)))
;; Make sure we can write to 'OUTPUT/etc'. 'union-build' above could have
;; made 'etc' a symlink to a read-only sub-directory in the store so we need
;; to work around that.
(ensure-writable-directory (string-append output "/etc"))
;; Write 'OUTPUT/etc/profile'.
(build-etc/profile output search-paths))
;;; profile.scm ends here
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