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guix-play/guix/inferior.scm
Ludovic Courtès 739380542d
inferior: Add 'inferior-available-packages'. 
* guix/inferior.scm (inferior-available-packages): New procedure.
* tests/inferior.scm ("inferior-available-packages"): New test.
2019-02-12 23:30:16 +01:00

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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2018, 2019 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 inferior)
#:use-module (srfi srfi-9)
#:use-module (srfi srfi-9 gnu)
#:use-module ((guix utils)
#:select (%current-system
source-properties->location
call-with-temporary-directory
version>? version-prefix?
cache-directory))
#:use-module ((guix store)
#:select (store-connection-socket
store-connection-major-version
store-connection-minor-version
store-lift))
#:use-module ((guix derivations)
#:select (read-derivation-from-file))
#:use-module (guix gexp)
#:use-module (guix search-paths)
#:use-module (guix profiles)
#:use-module (guix channels)
#:use-module (guix monads)
#:use-module (guix store)
#:use-module (guix derivations)
#:use-module (guix base32)
#:use-module (gcrypt hash)
#:autoload (guix cache) (maybe-remove-expired-cache-entries)
#:autoload (guix ui) (show-what-to-build*)
#:autoload (guix build utils) (mkdir-p)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
#:autoload (ice-9 ftw) (scandir)
#:use-module (ice-9 match)
#:use-module (ice-9 popen)
#:use-module (ice-9 vlist)
#:use-module (ice-9 binary-ports)
#:use-module ((rnrs bytevectors) #:select (string->utf8))
#:export (inferior?
open-inferior
port->inferior
close-inferior
inferior-eval
inferior-eval-with-store
inferior-object?
inferior-packages
inferior-available-packages
lookup-inferior-packages
inferior-package?
inferior-package-name
inferior-package-version
inferior-package-synopsis
inferior-package-description
inferior-package-home-page
inferior-package-location
inferior-package-inputs
inferior-package-native-inputs
inferior-package-propagated-inputs
inferior-package-transitive-propagated-inputs
inferior-package-native-search-paths
inferior-package-transitive-native-search-paths
inferior-package-search-paths
inferior-package-derivation
inferior-package->manifest-entry
gexp->derivation-in-inferior
%inferior-cache-directory
inferior-for-channels))
;;; Commentary:
;;;
;;; This module provides a way to spawn Guix "inferior" processes and to talk
;;; to them. It allows us, from one instance of Guix, to interact with
;;; another instance of Guix coming from a different commit.
;;;
;;; Code:
;; Inferior Guix process.
(define-record-type <inferior>
(inferior pid socket close version packages table)
inferior?
(pid inferior-pid)
(socket inferior-socket)
(close inferior-close-socket) ;procedure
(version inferior-version) ;REPL protocol version
(packages inferior-package-promise) ;promise of inferior packages
(table inferior-package-table)) ;promise of vhash
(define (inferior-pipe directory command)
"Return an input/output pipe on the Guix instance in DIRECTORY. This runs
'DIRECTORY/COMMAND repl' if it exists, or falls back to some other method if
it's an old Guix."
(let ((pipe (with-error-to-port (%make-void-port "w")
(lambda ()
(open-pipe* OPEN_BOTH
(string-append directory "/" command)
"repl" "-t" "machine")))))
(if (eof-object? (peek-char pipe))
(begin
(close-pipe pipe)
;; Older versions of Guix didn't have a 'guix repl' command, so
;; emulate it.
(open-pipe* OPEN_BOTH "guile"
"-L" (string-append directory "/share/guile/site/"
(effective-version))
"-C" (string-append directory "/share/guile/site/"
(effective-version))
"-C" (string-append directory "/lib/guile/"
(effective-version) "/site-ccache")
"-c"
(object->string
`(begin
(primitive-load ,(search-path %load-path
"guix/scripts/repl.scm"))
((@ (guix scripts repl) machine-repl))))))
pipe)))
(define* (port->inferior pipe #:optional (close close-port))
"Given PIPE, an input/output port, return an inferior that talks over PIPE.
PIPE is closed with CLOSE when 'close-inferior' is called on the returned
inferior."
(setvbuf pipe 'line)
(match (read pipe)
(('repl-version 0 rest ...)
(letrec ((result (inferior 'pipe pipe close (cons 0 rest)
(delay (%inferior-packages result))
(delay (%inferior-package-table result)))))
(inferior-eval '(use-modules (guix)) result)
(inferior-eval '(use-modules (gnu)) result)
(inferior-eval '(use-modules (ice-9 match)) result)
(inferior-eval '(define %package-table (make-hash-table))
result)
result))
(_
#f)))
(define* (open-inferior directory #:key (command "bin/guix"))
"Open the inferior Guix in DIRECTORY, running 'DIRECTORY/COMMAND repl' or
equivalent. Return #f if the inferior could not be launched."
(define pipe
(inferior-pipe directory command))
(port->inferior pipe close-pipe))
(define (close-inferior inferior)
"Close INFERIOR."
(let ((close (inferior-close-socket inferior)))
(close (inferior-socket inferior))))
;; Non-self-quoting object of the inferior.
(define-record-type <inferior-object>
(inferior-object address appearance)
inferior-object?
(address inferior-object-address)
(appearance inferior-object-appearance))
(define (write-inferior-object object port)
(match object
(($ <inferior-object> _ appearance)
(format port "#<inferior-object ~a>" appearance))))
(set-record-type-printer! <inferior-object> write-inferior-object)
(define (read-inferior-response inferior)
(define sexp->object
(match-lambda
(('value value)
value)
(('non-self-quoting address string)
(inferior-object address string))))
(match (read (inferior-socket inferior))
(('values objects ...)
(apply values (map sexp->object objects)))
(('exception key objects ...)
(apply throw key (map sexp->object objects)))))
(define (send-inferior-request exp inferior)
(write exp (inferior-socket inferior))
(newline (inferior-socket inferior)))
(define (inferior-eval exp inferior)
"Evaluate EXP in INFERIOR."
(send-inferior-request exp inferior)
(read-inferior-response inferior))
;;;
;;; Inferior packages.
;;;
(define-record-type <inferior-package>
(inferior-package inferior name version id)
inferior-package?
(inferior inferior-package-inferior)
(name inferior-package-name)
(version inferior-package-version)
(id inferior-package-id))
(define (write-inferior-package package port)
(match package
(($ <inferior-package> _ name version)
(format port "#<inferior-package ~a@~a ~a>"
name version
(number->string (object-address package) 16)))))
(set-record-type-printer! <inferior-package> write-inferior-package)
(define (%inferior-packages inferior)
"Compute the list of inferior packages from INFERIOR."
(let ((result (inferior-eval
'(fold-packages (lambda (package result)
(let ((id (object-address package)))
(hashv-set! %package-table id package)
(cons (list (package-name package)
(package-version package)
id)
result)))
'())
inferior)))
(map (match-lambda
((name version id)
(inferior-package inferior name version id)))
result)))
(define (inferior-packages inferior)
"Return the list of packages known to INFERIOR."
(force (inferior-package-promise inferior)))
(define (%inferior-package-table inferior)
"Compute a package lookup table for INFERIOR."
(fold (lambda (package table)
(vhash-cons (inferior-package-name package) package
table))
vlist-null
(inferior-packages inferior)))
(define (inferior-available-packages inferior)
"Return the list of name/version pairs corresponding to the set of packages
available in INFERIOR.
This is faster and requires less resource-intensive than calling
'inferior-packages'."
(if (inferior-eval '(defined? 'fold-available-packages)
inferior)
(inferior-eval '(fold-available-packages
(lambda* (name version result
#:key supported? deprecated?
#:allow-other-keys)
(if (and supported? (not deprecated?))
(acons name version result)
result))
'())
inferior)
;; As a last resort, if INFERIOR is old and lacks
;; 'fold-available-packages', fall back to 'inferior-packages'.
(map (lambda (package)
(cons (inferior-package-name package)
(inferior-package-version package)))
(inferior-packages inferior))))
(define* (lookup-inferior-packages inferior name #:optional version)
"Return the sorted list of inferior packages matching NAME in INFERIOR, with
highest version numbers first. If VERSION is true, return only packages with
a version number prefixed by VERSION."
;; This is the counterpart of 'find-packages-by-name'.
(sort (filter (lambda (package)
(or (not version)
(version-prefix? version
(inferior-package-version package))))
(vhash-fold* cons '() name
(force (inferior-package-table inferior))))
(lambda (p1 p2)
(version>? (inferior-package-version p1)
(inferior-package-version p2)))))
(define (inferior-package-field package getter)
"Return the field of PACKAGE, an inferior package, accessed with GETTER."
(let ((inferior (inferior-package-inferior package))
(id (inferior-package-id package)))
(inferior-eval `(,getter (hashv-ref %package-table ,id))
inferior)))
(define* (inferior-package-synopsis package #:key (translate? #t))
"Return the Texinfo synopsis of PACKAGE, an inferior package. When
TRANSLATE? is true, translate it to the current locale's language."
(inferior-package-field package
(if translate?
'(compose (@ (guix ui) P_) package-synopsis)
'package-synopsis)))
(define* (inferior-package-description package #:key (translate? #t))
"Return the Texinfo description of PACKAGE, an inferior package. When
TRANSLATE? is true, translate it to the current locale's language."
(inferior-package-field package
(if translate?
'(compose (@ (guix ui) P_) package-description)
'package-description)))
(define (inferior-package-home-page package)
"Return the home page of PACKAGE."
(inferior-package-field package 'package-home-page))
(define (inferior-package-location package)
"Return the source code location of PACKAGE, either #f or a <location>
record."
(source-properties->location
(inferior-package-field package
'(compose (lambda (loc)
(and loc
(location->source-properties
loc)))
package-location))))
(define (inferior-package-input-field package field)
"Return the input field FIELD (e.g., 'native-inputs') of PACKAGE, an
inferior package."
(define field*
`(compose (lambda (inputs)
(map (match-lambda
;; XXX: Origins are not handled.
((label (? package? package) rest ...)
(let ((id (object-address package)))
(hashv-set! %package-table id package)
`(,label (package ,id
,(package-name package)
,(package-version package))
,@rest)))
(x
x))
inputs))
,field))
(define inputs
(inferior-package-field package field*))
(define inferior
(inferior-package-inferior package))
(map (match-lambda
((label ('package id name version) . rest)
;; XXX: eq?-ness of inferior packages is not preserved here.
`(,label ,(inferior-package inferior name version id)
,@rest))
(x x))
inputs))
(define inferior-package-inputs
(cut inferior-package-input-field <> 'package-inputs))
(define inferior-package-native-inputs
(cut inferior-package-input-field <> 'package-native-inputs))
(define inferior-package-propagated-inputs
(cut inferior-package-input-field <> 'package-propagated-inputs))
(define inferior-package-transitive-propagated-inputs
(cut inferior-package-input-field <> 'package-transitive-propagated-inputs))
(define (%inferior-package-search-paths package field)
"Return the list of search path specificiations of PACKAGE, an inferior
package."
(define paths
(inferior-package-field package
`(compose (lambda (paths)
(map (@ (guix search-paths)
search-path-specification->sexp)
paths))
,field)))
(map sexp->search-path-specification paths))
(define inferior-package-native-search-paths
(cut %inferior-package-search-paths <> 'package-native-search-paths))
(define inferior-package-search-paths
(cut %inferior-package-search-paths <> 'package-search-paths))
(define inferior-package-transitive-native-search-paths
(cut %inferior-package-search-paths <> 'package-transitive-native-search-paths))
(define (proxy client backend) ;adapted from (guix ssh)
"Proxy communication between CLIENT and BACKEND until CLIENT closes the
connection, at which point CLIENT is closed (both CLIENT and BACKEND must be
input/output ports.)"
(define (select* read write except)
;; This is a workaround for <https://bugs.gnu.org/30365> in Guile < 2.2.4:
;; since 'select' sometimes returns non-empty sets for no good reason,
;; call 'select' a second time with a zero timeout to filter out incorrect
;; replies.
(match (select read write except)
((read write except)
(select read write except 0))))
;; Use buffered ports so that 'get-bytevector-some' returns up to the
;; whole buffer like read(2) would--see <https://bugs.gnu.org/30066>.
(setvbuf client 'block 65536)
(setvbuf backend 'block 65536)
(let loop ()
(match (select* (list client backend) '() '())
((reads () ())
(when (memq client reads)
(match (get-bytevector-some client)
((? eof-object?)
(close-port client))
(bv
(put-bytevector backend bv)
(force-output backend))))
(when (memq backend reads)
(match (get-bytevector-some backend)
(bv
(put-bytevector client bv)
(force-output client))))
(unless (port-closed? client)
(loop))))))
(define (inferior-eval-with-store inferior store code)
"Evaluate CODE in INFERIOR, passing it STORE as its argument. CODE must
thus be the code of a one-argument procedure that accepts a store."
;; Create a named socket in /tmp and let INFERIOR connect to it and use it
;; as its store. This ensures the inferior uses the same store, with the
;; same options, the same per-session GC roots, etc.
;; FIXME: This strategy doesn't work for remote inferiors (SSH).
(call-with-temporary-directory
(lambda (directory)
(chmod directory #o700)
(let* ((name (string-append directory "/inferior"))
(socket (socket AF_UNIX SOCK_STREAM 0))
(major (store-connection-major-version store))
(minor (store-connection-minor-version store))
(proto (logior major minor)))
(bind socket AF_UNIX name)
(listen socket 1024)
(send-inferior-request
`(let ((proc ,code)
(socket (socket AF_UNIX SOCK_STREAM 0)))
(connect socket AF_UNIX ,name)
;; 'port->connection' appeared in June 2018 and we can hardly
;; emulate it on older versions. Thus fall back to
;; 'open-connection', at the risk of talking to the wrong daemon or
;; having our build result reclaimed (XXX).
(let ((store (if (defined? 'port->connection)
(port->connection socket #:version ,proto)
(open-connection))))
(dynamic-wind
(const #t)
(lambda ()
(proc store))
(lambda ()
(close-connection store)
(close-port socket)))))
inferior)
(match (accept socket)
((client . address)
(proxy client (store-connection-socket store))))
(close-port socket)
(read-inferior-response inferior)))))
(define* (inferior-package-derivation store package
#:optional
(system (%current-system))
#:key target)
"Return the derivation for PACKAGE, an inferior package, built for SYSTEM
and cross-built for TARGET if TARGET is true. The inferior corresponding to
PACKAGE must be live."
(define proc
`(lambda (store)
(let* ((package (hashv-ref %package-table
,(inferior-package-id package)))
(drv ,(if target
`(package-cross-derivation store package
,target
,system)
`(package-derivation store package
,system))))
(derivation-file-name drv))))
(and=> (inferior-eval-with-store (inferior-package-inferior package) store
proc)
read-derivation-from-file))
(define inferior-package->derivation
(store-lift inferior-package-derivation))
(define-gexp-compiler (package-compiler (package <inferior-package>) system
target)
;; Compile PACKAGE for SYSTEM, optionally cross-building for TARGET.
(inferior-package->derivation package system #:target target))
(define* (gexp->derivation-in-inferior name exp guix
#:rest rest)
"Return a derivation that evaluates EXP with GUIX, an instance of Guix as
returned for example by 'channel-instances->derivation'. Other arguments are
passed as-is to 'gexp->derivation'."
(define script
;; EXP wrapped with a proper (set! %load-path …) prologue.
(scheme-file "inferior-script.scm" exp))
(define trampoline
;; This is a crude way to run EXP on GUIX. TODO: use 'raw-derivation' and
;; make 'guix repl' the "builder"; this will require "opening up" the
;; mechanisms behind 'gexp->derivation', and adding '-l' to 'guix repl'.
#~(begin
(use-modules (ice-9 popen))
(let ((pipe (open-pipe* OPEN_WRITE
#+(file-append guix "/bin/guix")
"repl" "-t" "machine")))
;; XXX: EXP presumably refers to #$output but that reference is lost
;; so explicitly reference it here.
#$output
(write `(primitive-load #$script) pipe)
(unless (zero? (close-pipe pipe))
(error "inferior failed" #+guix)))))
(apply gexp->derivation name trampoline rest))
;;;
;;; Manifest entries.
;;;
(define* (inferior-package->manifest-entry package
#:optional (output "out")
#:key (parent (delay #f))
(properties '()))
"Return a manifest entry for the OUTPUT of package PACKAGE."
;; For each dependency, keep a promise pointing to its "parent" entry.
(letrec* ((deps (map (match-lambda
((label package)
(inferior-package->manifest-entry package
#:parent (delay entry)))
((label package output)
(inferior-package->manifest-entry package output
#:parent (delay entry))))
(inferior-package-propagated-inputs package)))
(entry (manifest-entry
(name (inferior-package-name package))
(version (inferior-package-version package))
(output output)
(item package)
(dependencies (delete-duplicates deps))
(search-paths
(inferior-package-transitive-native-search-paths package))
(parent parent)
(properties properties))))
entry))
;;;
;;; Cached inferiors.
;;;
(define %inferior-cache-directory
;; Directory for cached inferiors (GC roots).
(make-parameter (string-append (cache-directory #:ensure? #f)
"/inferiors")))
(define* (inferior-for-channels channels
#:key
(cache-directory (%inferior-cache-directory))
(ttl (* 3600 24 30)))
"Return an inferior for CHANNELS, a list of channels. Use the cache at
CACHE-DIRECTORY, where entries can be reclaimed after TTL seconds. This
procedure opens a new connection to the build daemon.
This is a convenience procedure that people may use in manifests passed to
'guix package -m', for instance."
(with-store store
(let ()
(define instances
(latest-channel-instances store channels))
(define key
(bytevector->base32-string
(sha256
(string->utf8
(string-concatenate (map channel-instance-commit instances))))))
(define cached
(string-append cache-directory "/" key))
(define (base32-encoded-sha256? str)
(= (string-length str) 52))
(define (cache-entries directory)
(map (lambda (file)
(string-append directory "/" file))
(scandir directory base32-encoded-sha256?)))
(define symlink*
(lift2 symlink %store-monad))
(define add-indirect-root*
(store-lift add-indirect-root))
(mkdir-p cache-directory)
(maybe-remove-expired-cache-entries cache-directory
cache-entries
#:entry-expiration
(file-expiration-time ttl))
(if (file-exists? cached)
(open-inferior cached)
(run-with-store store
(mlet %store-monad ((profile
(channel-instances->derivation instances)))
(mbegin %store-monad
(show-what-to-build* (list profile))
(built-derivations (list profile))
(symlink* (derivation->output-path profile) cached)
(add-indirect-root* cached)
(return (open-inferior cached)))))))))
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