931 lines
35 KiB
Scheme
931 lines
35 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2013, 2014, 2015, 2016 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2013 Nikita Karetnikov <nikita@karetnikov.org>
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;;; Copyright © 2014 Alex Kost <alezost@gmail.com>
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;;; Copyright © 2015 Mark H Weaver <mhw@netris.org>
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;;; Copyright © 2015 Sou Bunnbu <iyzsong@gmail.com>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (guix profiles)
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#:use-module (guix utils)
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#:use-module (guix records)
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#:use-module (guix packages)
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#:use-module (guix derivations)
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#:use-module (guix search-paths)
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#:use-module (guix gexp)
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#:use-module (guix monads)
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#:use-module (guix store)
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#:use-module (ice-9 match)
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#:use-module (ice-9 regex)
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#:use-module (ice-9 ftw)
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#:use-module (ice-9 format)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-9)
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#:use-module (srfi srfi-11)
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#:use-module (srfi srfi-19)
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#:use-module (srfi srfi-26)
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#:use-module (srfi srfi-34)
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#:use-module (srfi srfi-35)
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#:export (&profile-error
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profile-error?
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profile-error-profile
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&profile-not-found-error
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profile-not-found-error?
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&missing-generation-error
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missing-generation-error?
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missing-generation-error-generation
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manifest make-manifest
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manifest?
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manifest-entries
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<manifest-entry> ; FIXME: eventually make it internal
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manifest-entry
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manifest-entry?
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manifest-entry-name
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manifest-entry-version
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manifest-entry-output
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manifest-entry-item
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manifest-entry-dependencies
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manifest-entry-search-paths
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manifest-pattern
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manifest-pattern?
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manifest-remove
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manifest-add
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manifest-lookup
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manifest-installed?
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manifest-matching-entries
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manifest-transaction
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manifest-transaction?
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manifest-transaction-install
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manifest-transaction-remove
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manifest-perform-transaction
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manifest-transaction-effects
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profile-manifest
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package->manifest-entry
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packages->manifest
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%default-profile-hooks
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profile-derivation
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generation-number
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generation-numbers
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profile-generations
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relative-generation
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previous-generation-number
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generation-time
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generation-file-name
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switch-to-generation
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roll-back
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delete-generation))
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;;; Commentary:
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;;;
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;;; Tools to create and manipulate profiles---i.e., the representation of a
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;;; set of installed packages.
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;;;
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;;; Code:
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;;;
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;;; Condition types.
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;;;
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(define-condition-type &profile-error &error
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profile-error?
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(profile profile-error-profile))
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(define-condition-type &profile-not-found-error &profile-error
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profile-not-found-error?)
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(define-condition-type &missing-generation-error &profile-error
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missing-generation-error?
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(generation missing-generation-error-generation))
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;;;
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;;; Manifests.
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;;;
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(define-record-type <manifest>
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(manifest entries)
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manifest?
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(entries manifest-entries)) ; list of <manifest-entry>
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;; Convenient alias, to avoid name clashes.
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(define make-manifest manifest)
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(define-record-type* <manifest-entry> manifest-entry
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make-manifest-entry
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manifest-entry?
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(name manifest-entry-name) ; string
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(version manifest-entry-version) ; string
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(output manifest-entry-output ; string
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(default "out"))
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(item manifest-entry-item) ; package | store path
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(dependencies manifest-entry-dependencies ; (store path | package)*
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(default '()))
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(search-paths manifest-entry-search-paths ; search-path-specification*
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(default '())))
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(define-record-type* <manifest-pattern> manifest-pattern
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make-manifest-pattern
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manifest-pattern?
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(name manifest-pattern-name) ; string
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(version manifest-pattern-version ; string | #f
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(default #f))
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(output manifest-pattern-output ; string | #f
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(default "out")))
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(define (profile-manifest profile)
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"Return the PROFILE's manifest."
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(let ((file (string-append profile "/manifest")))
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(if (file-exists? file)
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(call-with-input-file file read-manifest)
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(manifest '()))))
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(define* (package->manifest-entry package #:optional output)
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"Return a manifest entry for the OUTPUT of package PACKAGE. When OUTPUT is
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omitted or #f, use the first output of PACKAGE."
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(let ((deps (map (match-lambda
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((label package)
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(gexp-input package))
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((label package output)
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(gexp-input package output)))
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(package-transitive-propagated-inputs package))))
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(manifest-entry
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(name (package-name package))
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(version (package-version package))
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(output (or output (car (package-outputs package))))
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(item package)
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(dependencies (delete-duplicates deps))
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(search-paths (package-transitive-native-search-paths package)))))
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(define (packages->manifest packages)
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"Return a list of manifest entries, one for each item listed in PACKAGES.
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Elements of PACKAGES can be either package objects or package/string tuples
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denoting a specific output of a package."
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(manifest
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(map (match-lambda
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((package output)
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(package->manifest-entry package output))
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(package
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(package->manifest-entry package)))
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packages)))
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(define (manifest->gexp manifest)
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"Return a representation of MANIFEST as a gexp."
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(define (entry->gexp entry)
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(match entry
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(($ <manifest-entry> name version output (? string? path)
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(deps ...) (search-paths ...))
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#~(#$name #$version #$output #$path
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(propagated-inputs #$deps)
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(search-paths #$(map search-path-specification->sexp
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search-paths))))
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(($ <manifest-entry> name version output (? package? package)
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(deps ...) (search-paths ...))
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#~(#$name #$version #$output
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(ungexp package (or output "out"))
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(propagated-inputs #$deps)
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(search-paths #$(map search-path-specification->sexp
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search-paths))))))
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(match manifest
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(($ <manifest> (entries ...))
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#~(manifest (version 2)
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(packages #$(map entry->gexp entries))))))
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(define (find-package name version)
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"Return a package from the distro matching NAME and possibly VERSION. This
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procedure is here for backward-compatibility and will eventually vanish."
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(define find-best-packages-by-name ;break abstractions
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(module-ref (resolve-interface '(gnu packages))
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'find-best-packages-by-name))
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;; Use 'find-best-packages-by-name' and not 'find-packages-by-name'; the
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;; former traverses the module tree only once and then allows for efficient
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;; access via a vhash.
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(match (find-best-packages-by-name name version)
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((p _ ...) p)
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(_
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(match (find-best-packages-by-name name #f)
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((p _ ...) p)
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(_ #f)))))
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(define (sexp->manifest sexp)
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"Parse SEXP as a manifest."
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(define (infer-search-paths name version)
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;; Infer the search path specifications for NAME-VERSION by looking up a
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;; same-named package in the distro. Useful for the old manifest formats
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;; that did not store search path info.
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(let ((package (find-package name version)))
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(if package
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(package-native-search-paths package)
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'())))
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(match sexp
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(('manifest ('version 0)
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('packages ((name version output path) ...)))
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(manifest
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(map (lambda (name version output path)
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(manifest-entry
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(name name)
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(version version)
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(output output)
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(item path)
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(search-paths (infer-search-paths name version))))
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name version output path)))
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;; Version 1 adds a list of propagated inputs to the
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;; name/version/output/path tuples.
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(('manifest ('version 1)
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('packages ((name version output path deps) ...)))
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(manifest
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(map (lambda (name version output path deps)
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;; Up to Guix 0.7 included, dependencies were listed as ("gmp"
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;; "/gnu/store/...-gmp") for instance. Discard the 'label' in
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;; such lists.
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(let ((deps (match deps
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(((labels directories) ...)
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directories)
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((directories ...)
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directories))))
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(manifest-entry
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(name name)
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(version version)
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(output output)
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(item path)
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(dependencies deps)
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(search-paths (infer-search-paths name version)))))
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name version output path deps)))
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;; Version 2 adds search paths and is slightly more verbose.
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(('manifest ('version 2 minor-version ...)
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('packages ((name version output path
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('propagated-inputs deps)
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('search-paths search-paths)
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extra-stuff ...)
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...)))
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(manifest
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(map (lambda (name version output path deps search-paths)
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(manifest-entry
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(name name)
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(version version)
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(output output)
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(item path)
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(dependencies deps)
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(search-paths (map sexp->search-path-specification
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search-paths))))
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name version output path deps search-paths)))
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(_
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(raise (condition
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(&message (message "unsupported manifest format")))))))
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(define (read-manifest port)
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"Return the packages listed in MANIFEST."
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(sexp->manifest (read port)))
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(define (entry-predicate pattern)
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"Return a procedure that returns #t when passed a manifest entry that
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matches NAME/OUTPUT/VERSION. OUTPUT and VERSION may be #f, in which case they
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are ignored."
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(match pattern
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(($ <manifest-pattern> name version output)
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(match-lambda
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(($ <manifest-entry> entry-name entry-version entry-output)
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(and (string=? entry-name name)
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(or (not entry-output) (not output)
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(string=? entry-output output))
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(or (not version)
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(string=? entry-version version))))))))
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(define (manifest-remove manifest patterns)
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"Remove entries for each of PATTERNS from MANIFEST. Each item in PATTERNS
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must be a manifest-pattern."
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(define (remove-entry pattern lst)
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(remove (entry-predicate pattern) lst))
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(make-manifest (fold remove-entry
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(manifest-entries manifest)
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patterns)))
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(define (manifest-add manifest entries)
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"Add a list of manifest ENTRIES to MANIFEST and return new manifest.
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Remove MANIFEST entries that have the same name and output as ENTRIES."
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(define (same-entry? entry name output)
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(match entry
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(($ <manifest-entry> entry-name _ entry-output _ ...)
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(and (equal? name entry-name)
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(equal? output entry-output)))))
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(make-manifest
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(append entries
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(fold (lambda (entry result)
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(match entry
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(($ <manifest-entry> name _ out _ ...)
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(filter (negate (cut same-entry? <> name out))
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result))))
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(manifest-entries manifest)
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entries))))
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(define (manifest-lookup manifest pattern)
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"Return the first item of MANIFEST that matches PATTERN, or #f if there is
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no match.."
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(find (entry-predicate pattern)
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(manifest-entries manifest)))
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(define (manifest-installed? manifest pattern)
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"Return #t if MANIFEST has an entry matching PATTERN (a manifest-pattern),
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#f otherwise."
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(->bool (manifest-lookup manifest pattern)))
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(define (manifest-matching-entries manifest patterns)
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"Return all the entries of MANIFEST that match one of the PATTERNS."
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(define predicates
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(map entry-predicate patterns))
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(define (matches? entry)
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(any (lambda (pred)
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(pred entry))
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predicates))
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(filter matches? (manifest-entries manifest)))
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;;;
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;;; Manifest transactions.
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;;;
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(define-record-type* <manifest-transaction> manifest-transaction
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make-manifest-transaction
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manifest-transaction?
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(install manifest-transaction-install ; list of <manifest-entry>
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(default '()))
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(remove manifest-transaction-remove ; list of <manifest-pattern>
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(default '())))
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(define (manifest-transaction-effects manifest transaction)
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"Compute the effect of applying TRANSACTION to MANIFEST. Return 4 values:
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the list of packages that would be removed, installed, upgraded, or downgraded
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when applying TRANSACTION to MANIFEST. Upgrades are represented as pairs
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where the head is the entry being upgraded and the tail is the entry that will
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replace it."
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(define (manifest-entry->pattern entry)
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(manifest-pattern
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(name (manifest-entry-name entry))
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(output (manifest-entry-output entry))))
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(let loop ((input (manifest-transaction-install transaction))
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(install '())
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(upgrade '())
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(downgrade '()))
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(match input
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(()
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(let ((remove (manifest-transaction-remove transaction)))
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(values (manifest-matching-entries manifest remove)
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(reverse install) (reverse upgrade) (reverse downgrade))))
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((entry rest ...)
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;; Check whether installing ENTRY corresponds to the installation of a
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;; new package or to an upgrade.
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;; XXX: When the exact same output directory is installed, we're not
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;; really upgrading anything. Add a check for that case.
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(let* ((pattern (manifest-entry->pattern entry))
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(previous (manifest-lookup manifest pattern))
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(newer? (and previous
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(version>=? (manifest-entry-version entry)
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(manifest-entry-version previous)))))
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(loop rest
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(if previous install (cons entry install))
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(if (and previous newer?)
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(alist-cons previous entry upgrade)
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upgrade)
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(if (and previous (not newer?))
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(alist-cons previous entry downgrade)
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downgrade)))))))
|
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(define (manifest-perform-transaction manifest transaction)
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"Perform TRANSACTION on MANIFEST and return new manifest."
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(let ((install (manifest-transaction-install transaction))
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(remove (manifest-transaction-remove transaction)))
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(manifest-add (manifest-remove manifest remove)
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install)))
|
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|
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|
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;;;
|
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;;; Profiles.
|
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;;;
|
||
|
||
(define (manifest-inputs manifest)
|
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"Return a list of <gexp-input> objects for MANIFEST."
|
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(append-map (match-lambda
|
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(($ <manifest-entry> name version output thing deps)
|
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;; THING may be a package or a file name. In the latter case,
|
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;; assume it's already valid. Ditto for DEPS.
|
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(cons (gexp-input thing output) deps)))
|
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(manifest-entries manifest)))
|
||
|
||
(define (info-dir-file manifest)
|
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"Return a derivation that builds the 'dir' file for all the entries of
|
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MANIFEST."
|
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(define texinfo ;lazy reference
|
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(module-ref (resolve-interface '(gnu packages texinfo)) 'texinfo))
|
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(define gzip ;lazy reference
|
||
(module-ref (resolve-interface '(gnu packages compression)) 'gzip))
|
||
|
||
(define build
|
||
#~(begin
|
||
(use-modules (guix build utils)
|
||
(srfi srfi-1) (srfi srfi-26)
|
||
(ice-9 ftw))
|
||
|
||
(define (info-file? file)
|
||
(or (string-suffix? ".info" file)
|
||
(string-suffix? ".info.gz" file)))
|
||
|
||
(define (info-files top)
|
||
(let ((infodir (string-append top "/share/info")))
|
||
(map (cut string-append infodir "/" <>)
|
||
(or (scandir infodir info-file?) '()))))
|
||
|
||
(define (install-info info)
|
||
(setenv "PATH" (string-append #+gzip "/bin")) ;for info.gz files
|
||
(zero?
|
||
(system* (string-append #+texinfo "/bin/install-info") "--silent"
|
||
info (string-append #$output "/share/info/dir"))))
|
||
|
||
(mkdir-p (string-append #$output "/share/info"))
|
||
(every install-info
|
||
(append-map info-files
|
||
'#$(manifest-inputs manifest)))))
|
||
|
||
(gexp->derivation "info-dir" build
|
||
#:modules '((guix build utils))
|
||
#:local-build? #t
|
||
#:substitutable? #f))
|
||
|
||
(define (ghc-package-cache-file manifest)
|
||
"Return a derivation that builds the GHC 'package.cache' file for all the
|
||
entries of MANIFEST, or #f if MANIFEST does not have any GHC packages."
|
||
(define ghc ;lazy reference
|
||
(module-ref (resolve-interface '(gnu packages haskell)) 'ghc))
|
||
|
||
(define build
|
||
#~(begin
|
||
(use-modules (guix build utils)
|
||
(srfi srfi-1) (srfi srfi-26)
|
||
(ice-9 ftw))
|
||
|
||
(define ghc-name-version
|
||
(let* ((base (basename #+ghc)))
|
||
(string-drop base
|
||
(+ 1 (string-index base #\-)))))
|
||
|
||
(define db-subdir
|
||
(string-append "lib/" ghc-name-version "/package.conf.d"))
|
||
|
||
(define db-dir
|
||
(string-append #$output "/" db-subdir))
|
||
|
||
(define (conf-files top)
|
||
(let ((db (string-append top "/" db-subdir)))
|
||
(if (file-exists? db)
|
||
(find-files db "\\.conf$")
|
||
'())))
|
||
|
||
(define (copy-conf-file conf)
|
||
(let ((base (basename conf)))
|
||
(copy-file conf (string-append db-dir "/" base))))
|
||
|
||
(system* (string-append #+ghc "/bin/ghc-pkg") "init" db-dir)
|
||
(for-each copy-conf-file
|
||
(append-map conf-files
|
||
(delete-duplicates
|
||
'#$(manifest-inputs manifest))))
|
||
(let ((success
|
||
(zero?
|
||
(system* (string-append #+ghc "/bin/ghc-pkg") "recache"
|
||
(string-append "--package-db=" db-dir)))))
|
||
(for-each delete-file (find-files db-dir "\\.conf$"))
|
||
success)))
|
||
|
||
(with-monad %store-monad
|
||
;; Don't depend on GHC when there's nothing to do.
|
||
(if (any (cut string-prefix? "ghc" <>)
|
||
(map manifest-entry-name (manifest-entries manifest)))
|
||
(gexp->derivation "ghc-package-cache" build
|
||
#:modules '((guix build utils))
|
||
#:local-build? #t
|
||
#:substitutable? #f)
|
||
(return #f))))
|
||
|
||
(define (ca-certificate-bundle manifest)
|
||
"Return a derivation that builds a single-file bundle containing the CA
|
||
certificates in the /etc/ssl/certs sub-directories of the packages in
|
||
MANIFEST. Single-file bundles are required by programs such as Git and Lynx."
|
||
;; See <http://lists.gnu.org/archive/html/guix-devel/2015-02/msg00429.html>
|
||
;; for a discussion.
|
||
|
||
(define glibc-utf8-locales ;lazy reference
|
||
(module-ref (resolve-interface '(gnu packages base)) 'glibc-utf8-locales))
|
||
|
||
(define build
|
||
#~(begin
|
||
(use-modules (guix build utils)
|
||
(rnrs io ports)
|
||
(srfi srfi-1)
|
||
(srfi srfi-26)
|
||
(ice-9 ftw)
|
||
(ice-9 match))
|
||
|
||
(define (pem-file? file)
|
||
(string-suffix? ".pem" file))
|
||
|
||
(define (ca-files top)
|
||
(let ((cert-dir (string-append top "/etc/ssl/certs")))
|
||
(map (cut string-append cert-dir "/" <>)
|
||
(or (scandir cert-dir pem-file?) '()))))
|
||
|
||
(define (concatenate-files files result)
|
||
"Make RESULT the concatenation of all of FILES."
|
||
(define (dump file port)
|
||
(display (call-with-input-file file get-string-all)
|
||
port)
|
||
(newline port)) ;required, see <https://bugs.debian.org/635570>
|
||
|
||
(call-with-output-file result
|
||
(lambda (port)
|
||
(for-each (cut dump <> port) files))))
|
||
|
||
;; Some file names in the NSS certificates are UTF-8 encoded so
|
||
;; install a UTF-8 locale.
|
||
(setenv "LOCPATH"
|
||
(string-append #+glibc-utf8-locales "/lib/locale/"
|
||
#+(package-version glibc-utf8-locales)))
|
||
(setlocale LC_ALL "en_US.utf8")
|
||
|
||
(match (append-map ca-files '#$(manifest-inputs manifest))
|
||
(()
|
||
;; Since there are no CA files, just create an empty directory. Do
|
||
;; not create the etc/ssl/certs sub-directory, since that would
|
||
;; wrongfully lead to a message about 'SSL_CERT_DIR' needing to be
|
||
;; defined.
|
||
(mkdir #$output)
|
||
#t)
|
||
((ca-files ...)
|
||
(let ((result (string-append #$output "/etc/ssl/certs")))
|
||
(mkdir-p result)
|
||
(concatenate-files ca-files
|
||
(string-append result
|
||
"/ca-certificates.crt"))
|
||
#t)))))
|
||
|
||
(gexp->derivation "ca-certificate-bundle" build
|
||
#:modules '((guix build utils))
|
||
#:local-build? #t
|
||
#:substitutable? #f))
|
||
|
||
(define (gtk-icon-themes manifest)
|
||
"Return a derivation that unions all icon themes from manifest entries and
|
||
creates the GTK+ 'icon-theme.cache' file for each theme."
|
||
;; Return as a monadic value the GTK+ package or store path referenced by the
|
||
;; manifest ENTRY, or #f if not referenced.
|
||
(define (entry-lookup-gtk+ entry)
|
||
(define (find-among-inputs inputs)
|
||
(find (lambda (input)
|
||
(and (package? input)
|
||
(string=? "gtk+" (package-name input))))
|
||
inputs))
|
||
|
||
(define (find-among-store-items items)
|
||
(find (lambda (item)
|
||
(equal? "gtk+"
|
||
(package-name->name+version
|
||
(store-path-package-name item))))
|
||
items))
|
||
|
||
;; TODO: Factorize.
|
||
(define references*
|
||
(store-lift references))
|
||
|
||
(with-monad %store-monad
|
||
(match (manifest-entry-item entry)
|
||
((? package? package)
|
||
(match (package-transitive-inputs package)
|
||
(((labels inputs . _) ...)
|
||
(return (find-among-inputs inputs)))))
|
||
((? string? item)
|
||
(mlet %store-monad ((refs (references* item)))
|
||
(return (find-among-store-items refs)))))))
|
||
|
||
(define (manifest-lookup-gtk+ manifest)
|
||
(anym %store-monad
|
||
entry-lookup-gtk+ (manifest-entries manifest)))
|
||
|
||
(mlet %store-monad ((gtk+ (manifest-lookup-gtk+ manifest)))
|
||
(define build
|
||
#~(begin
|
||
(use-modules (guix build utils)
|
||
(guix build union)
|
||
(guix build profiles)
|
||
(srfi srfi-26)
|
||
(ice-9 ftw))
|
||
|
||
(let* ((destdir (string-append #$output "/share/icons"))
|
||
(icondirs (filter file-exists?
|
||
(map (cut string-append <> "/share/icons")
|
||
'#$(manifest-inputs manifest))))
|
||
(update-icon-cache (string-append
|
||
#+gtk+ "/bin/gtk-update-icon-cache")))
|
||
|
||
;; Union all the icons.
|
||
(mkdir-p (string-append #$output "/share"))
|
||
(union-build destdir icondirs
|
||
#:log-port (%make-void-port "w"))
|
||
|
||
;; Update the 'icon-theme.cache' file for each icon theme.
|
||
(for-each
|
||
(lambda (theme)
|
||
(let ((dir (string-append destdir "/" theme)))
|
||
;; Occasionally DESTDIR contains plain files, such as
|
||
;; "abiword_48.png". Ignore these.
|
||
(when (file-is-directory? dir)
|
||
(ensure-writable-directory dir)
|
||
(system* update-icon-cache "-t" dir "--quiet"))))
|
||
(scandir destdir (negate (cut member <> '("." ".."))))))))
|
||
|
||
;; Don't run the hook when there's nothing to do.
|
||
(if gtk+
|
||
(gexp->derivation "gtk-icon-themes" build
|
||
#:modules '((guix build utils)
|
||
(guix build union)
|
||
(guix build profiles)
|
||
(guix search-paths)
|
||
(guix records))
|
||
#:local-build? #t
|
||
#:substitutable? #f)
|
||
(return #f))))
|
||
|
||
(define %default-profile-hooks
|
||
;; This is the list of derivation-returning procedures that are called by
|
||
;; default when making a non-empty profile.
|
||
(list info-dir-file
|
||
ghc-package-cache-file
|
||
ca-certificate-bundle
|
||
gtk-icon-themes))
|
||
|
||
(define* (profile-derivation manifest
|
||
#:key
|
||
(hooks %default-profile-hooks)
|
||
system)
|
||
"Return a derivation that builds a profile (aka. 'user environment') with
|
||
the given MANIFEST. The profile includes additional derivations returned by
|
||
the monadic procedures listed in HOOKS--such as an Info 'dir' file, etc."
|
||
(mlet %store-monad ((system (if system
|
||
(return system)
|
||
(current-system)))
|
||
(extras (if (null? (manifest-entries manifest))
|
||
(return '())
|
||
(sequence %store-monad
|
||
(map (lambda (hook)
|
||
(hook manifest))
|
||
hooks)))))
|
||
(define inputs
|
||
(append (filter-map (lambda (drv)
|
||
(and (derivation? drv)
|
||
(gexp-input drv)))
|
||
extras)
|
||
(manifest-inputs manifest)))
|
||
|
||
(define builder
|
||
#~(begin
|
||
(use-modules (guix build profiles)
|
||
(guix search-paths)
|
||
(srfi srfi-1))
|
||
|
||
(setvbuf (current-output-port) _IOLBF)
|
||
(setvbuf (current-error-port) _IOLBF)
|
||
|
||
(define search-paths
|
||
;; Search paths of MANIFEST's packages, converted back to their
|
||
;; record form.
|
||
(map sexp->search-path-specification
|
||
(delete-duplicates
|
||
'#$(map search-path-specification->sexp
|
||
(append-map manifest-entry-search-paths
|
||
(manifest-entries manifest))))))
|
||
|
||
(build-profile #$output '#$inputs
|
||
#:manifest '#$(manifest->gexp manifest)
|
||
#:search-paths search-paths)))
|
||
|
||
(gexp->derivation "profile" builder
|
||
#:modules '((guix build profiles)
|
||
(guix build union)
|
||
(guix build utils)
|
||
(guix search-paths)
|
||
(guix records))
|
||
|
||
;; Not worth offloading.
|
||
#:local-build? #t
|
||
|
||
;; Disable substitution because it would trigger a
|
||
;; connection to the substitute server, which is likely
|
||
;; to have no substitute to offer.
|
||
#:substitutable? #f)))
|
||
|
||
(define (profile-regexp profile)
|
||
"Return a regular expression that matches PROFILE's name and number."
|
||
(make-regexp (string-append "^" (regexp-quote (basename profile))
|
||
"-([0-9]+)")))
|
||
|
||
(define (generation-number profile)
|
||
"Return PROFILE's number or 0. An absolute file name must be used."
|
||
(or (and=> (false-if-exception (regexp-exec (profile-regexp profile)
|
||
(basename (readlink profile))))
|
||
(compose string->number (cut match:substring <> 1)))
|
||
0))
|
||
|
||
(define (generation-numbers profile)
|
||
"Return the sorted list of generation numbers of PROFILE, or '(0) if no
|
||
former profiles were found."
|
||
(define* (scandir name #:optional (select? (const #t))
|
||
(entry<? (@ (ice-9 i18n) string-locale<?)))
|
||
;; XXX: Bug-fix version introduced in Guile v2.0.6-62-g139ce19.
|
||
(define (enter? dir stat result)
|
||
(and stat (string=? dir name)))
|
||
|
||
(define (visit basename result)
|
||
(if (select? basename)
|
||
(cons basename result)
|
||
result))
|
||
|
||
(define (leaf name stat result)
|
||
(and result
|
||
(visit (basename name) result)))
|
||
|
||
(define (down name stat result)
|
||
(visit "." '()))
|
||
|
||
(define (up name stat result)
|
||
(visit ".." result))
|
||
|
||
(define (skip name stat result)
|
||
;; All the sub-directories are skipped.
|
||
(visit (basename name) result))
|
||
|
||
(define (error name* stat errno result)
|
||
(if (string=? name name*) ; top-level NAME is unreadable
|
||
result
|
||
(visit (basename name*) result)))
|
||
|
||
(and=> (file-system-fold enter? leaf down up skip error #f name lstat)
|
||
(lambda (files)
|
||
(sort files entry<?))))
|
||
|
||
(match (scandir (dirname profile)
|
||
(cute regexp-exec (profile-regexp profile) <>))
|
||
(#f ; no profile directory
|
||
'(0))
|
||
(() ; no profiles
|
||
'(0))
|
||
((profiles ...) ; former profiles around
|
||
(sort (map (compose string->number
|
||
(cut match:substring <> 1)
|
||
(cute regexp-exec (profile-regexp profile) <>))
|
||
profiles)
|
||
<))))
|
||
|
||
(define (profile-generations profile)
|
||
"Return a list of PROFILE's generations."
|
||
(let ((generations (generation-numbers profile)))
|
||
(if (equal? generations '(0))
|
||
'()
|
||
generations)))
|
||
|
||
(define* (relative-generation profile shift #:optional
|
||
(current (generation-number profile)))
|
||
"Return PROFILE's generation shifted from the CURRENT generation by SHIFT.
|
||
SHIFT is a positive or negative number.
|
||
Return #f if there is no such generation."
|
||
(let* ((abs-shift (abs shift))
|
||
(numbers (profile-generations profile))
|
||
(from-current (memq current
|
||
(if (negative? shift)
|
||
(reverse numbers)
|
||
numbers))))
|
||
(and from-current
|
||
(< abs-shift (length from-current))
|
||
(list-ref from-current abs-shift))))
|
||
|
||
(define* (previous-generation-number profile #:optional
|
||
(number (generation-number profile)))
|
||
"Return the number of the generation before generation NUMBER of
|
||
PROFILE, or 0 if none exists. It could be NUMBER - 1, but it's not the
|
||
case when generations have been deleted (there are \"holes\")."
|
||
(or (relative-generation profile -1 number)
|
||
0))
|
||
|
||
(define (generation-file-name profile generation)
|
||
"Return the file name for PROFILE's GENERATION."
|
||
(format #f "~a-~a-link" profile generation))
|
||
|
||
(define (generation-time profile number)
|
||
"Return the creation time of a generation in the UTC format."
|
||
(make-time time-utc 0
|
||
(stat:ctime (stat (generation-file-name profile number)))))
|
||
|
||
(define (link-to-empty-profile store generation)
|
||
"Link GENERATION, a string, to the empty profile. An error is raised if
|
||
that fails."
|
||
(let* ((drv (run-with-store store
|
||
(profile-derivation (manifest '()))))
|
||
(prof (derivation->output-path drv "out")))
|
||
(build-derivations store (list drv))
|
||
(switch-symlinks generation prof)))
|
||
|
||
(define (switch-to-generation profile number)
|
||
"Atomically switch PROFILE to the generation NUMBER. Return the number of
|
||
the generation that was current before switching."
|
||
(let ((current (generation-number profile))
|
||
(generation (generation-file-name profile number)))
|
||
(cond ((not (file-exists? profile))
|
||
(raise (condition (&profile-not-found-error
|
||
(profile profile)))))
|
||
((not (file-exists? generation))
|
||
(raise (condition (&missing-generation-error
|
||
(profile profile)
|
||
(generation number)))))
|
||
(else
|
||
(switch-symlinks profile generation)
|
||
current))))
|
||
|
||
(define (switch-to-previous-generation profile)
|
||
"Atomically switch PROFILE to the previous generation. Return the former
|
||
generation number and the current one."
|
||
(let ((previous (previous-generation-number profile)))
|
||
(values (switch-to-generation profile previous)
|
||
previous)))
|
||
|
||
(define (roll-back store profile)
|
||
"Roll back to the previous generation of PROFILE. Return the number of the
|
||
generation that was current before switching and the new generation number."
|
||
(let* ((number (generation-number profile))
|
||
(previous-number (previous-generation-number profile number))
|
||
(previous-generation (generation-file-name profile previous-number)))
|
||
(cond ((not (file-exists? profile)) ;invalid profile
|
||
(raise (condition (&profile-not-found-error
|
||
(profile profile)))))
|
||
((zero? number) ;empty profile
|
||
(values number number))
|
||
((or (zero? previous-number) ;going to emptiness
|
||
(not (file-exists? previous-generation)))
|
||
(link-to-empty-profile store previous-generation)
|
||
(switch-to-previous-generation profile))
|
||
(else ;anything else
|
||
(switch-to-previous-generation profile)))))
|
||
|
||
(define (delete-generation store profile number)
|
||
"Delete generation with NUMBER from PROFILE. Return the file name of the
|
||
generation that has been deleted, or #f if nothing was done (for instance
|
||
because the NUMBER is zero.)"
|
||
(define (delete-and-return)
|
||
(let ((generation (generation-file-name profile number)))
|
||
(delete-file generation)
|
||
generation))
|
||
|
||
(let* ((current-number (generation-number profile))
|
||
(previous-number (previous-generation-number profile number))
|
||
(previous-generation (generation-file-name profile previous-number)))
|
||
(cond ((zero? number) #f) ;do not delete generation 0
|
||
((and (= number current-number)
|
||
(not (file-exists? previous-generation)))
|
||
(link-to-empty-profile store previous-generation)
|
||
(switch-to-previous-generation profile)
|
||
(delete-and-return))
|
||
((= number current-number)
|
||
(roll-back store profile)
|
||
(delete-and-return))
|
||
(else
|
||
(delete-and-return)))))
|
||
|
||
;;; profiles.scm ends here
|