ef86c39f27
* guix/store.scm (&nix-connection-error): New condition type. (open-connection): Translate `system-error' during the `connect' call into `&nix-connection-error'. * guix/ui.scm (call-with-error-handling): Add case for `nix-connection-error?'. * guix/scripts/package.scm (guix-package): Move `open-connection' call within `with-error-handling'. * guix/scripts/pull.scm (guix-pull): Likewise. * guix/scripts/download.scm (guix-download): Move body within `with-error-handling'.
742 lines
25 KiB
Scheme
742 lines
25 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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||
;;; Copyright © 2012, 2013 Ludovic Courtès <ludo@gnu.org>
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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
|
||
;;; 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 store)
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#:use-module (guix utils)
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#:use-module (guix config)
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#:use-module (rnrs bytevectors)
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#:use-module (rnrs io ports)
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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-26)
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#:use-module (srfi srfi-34)
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#:use-module (srfi srfi-35)
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#:use-module (srfi srfi-39)
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#:use-module (ice-9 match)
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#:use-module (ice-9 rdelim)
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#:use-module (ice-9 ftw)
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#:use-module (ice-9 regex)
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#:export (%daemon-socket-file
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nix-server?
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nix-server-major-version
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nix-server-minor-version
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nix-server-socket
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&nix-error nix-error?
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&nix-connection-error nix-connection-error?
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nix-connection-error-file
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nix-connection-error-code
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&nix-protocol-error nix-protocol-error?
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nix-protocol-error-message
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||
nix-protocol-error-status
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||
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||
hash-algo
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||
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||
open-connection
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close-connection
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||
set-build-options
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||
valid-path?
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||
query-path-hash
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||
add-text-to-store
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||
add-to-store
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||
build-derivations
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||
add-temp-root
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add-indirect-root
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||
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||
substitutable?
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substitutable-path
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||
substitutable-deriver
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substitutable-references
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substitutable-download-size
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substitutable-nar-size
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has-substitutes?
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substitutable-paths
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substitutable-path-info
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||
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references
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referrers
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||
valid-derivers
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||
query-derivation-outputs
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||
live-paths
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||
dead-paths
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||
collect-garbage
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||
delete-paths
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||
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current-build-output-port
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%store-prefix
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store-path?
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derivation-path?
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store-path-package-name))
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(define %protocol-version #x10c)
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(define %worker-magic-1 #x6e697863)
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(define %worker-magic-2 #x6478696f)
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||
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(define (protocol-major magic)
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(logand magic #xff00))
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(define (protocol-minor magic)
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(logand magic #x00ff))
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||
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||
(define-syntax define-enumerate-type
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(syntax-rules ()
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((_ name->int (name id) ...)
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(define-syntax name->int
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(syntax-rules (name ...)
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((_ name) id) ...)))))
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(define-enumerate-type operation-id
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;; operation numbers from worker-protocol.hh
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(quit 0)
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(valid-path? 1)
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(has-substitutes? 3)
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(query-path-hash 4)
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(query-references 5)
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(query-referrers 6)
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(add-to-store 7)
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(add-text-to-store 8)
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(build-derivations 9)
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(ensure-path 10)
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(add-temp-root 11)
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(add-indirect-root 12)
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(sync-with-gc 13)
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(find-roots 14)
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(export-path 16)
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(query-deriver 18)
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(set-options 19)
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(collect-garbage 20)
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;;(query-substitutable-path-info 21) ; obsolete as of #x10c
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(query-derivation-outputs 22)
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(query-all-valid-paths 23)
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(query-failed-paths 24)
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(clear-failed-paths 25)
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(query-path-info 26)
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(import-paths 27)
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(query-derivation-output-names 28)
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(query-path-from-hash-part 29)
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(query-substitutable-path-infos 30)
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(query-valid-paths 31)
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(query-substitutable-paths 32)
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(query-valid-derivers 33))
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(define-enumerate-type hash-algo
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;; hash.hh
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(md5 1)
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(sha1 2)
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(sha256 3))
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(define-enumerate-type gc-action
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;; store-api.hh
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(return-live 0)
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(return-dead 1)
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(delete-dead 2)
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(delete-specific 3))
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(define %default-socket-path
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(string-append (or (getenv "NIX_STATE_DIR") %state-directory)
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"/daemon-socket/socket"))
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(define %daemon-socket-file
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;; File name of the socket the daemon listens too.
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(make-parameter (or (getenv "GUIX_DAEMON_SOCKET")
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%default-socket-path)))
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||
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||
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;; serialize.cc
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||
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||
(define (write-int n p)
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(let ((b (make-bytevector 8 0)))
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(bytevector-u32-set! b 0 n (endianness little))
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(put-bytevector p b)))
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(define (read-int p)
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(let ((b (get-bytevector-n p 8)))
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(bytevector-u32-ref b 0 (endianness little))))
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(define (write-long-long n p)
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(let ((b (make-bytevector 8 0)))
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(bytevector-u64-set! b 0 n (endianness little))
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(put-bytevector p b)))
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(define (read-long-long p)
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(let ((b (get-bytevector-n p 8)))
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(bytevector-u64-ref b 0 (endianness little))))
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(define write-padding
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(let ((zero (make-bytevector 8 0)))
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(lambda (n p)
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(let ((m (modulo n 8)))
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(or (zero? m)
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(put-bytevector p zero 0 (- 8 m)))))))
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(define (write-string s p)
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(let* ((s (string->utf8 s))
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(l (bytevector-length s))
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(m (modulo l 8))
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(b (make-bytevector (+ 8 l (if (zero? m) 0 (- 8 m))))))
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(bytevector-u32-set! b 0 l (endianness little))
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(bytevector-copy! s 0 b 8 l)
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(put-bytevector p b)))
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(define (read-string p)
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(let* ((len (read-int p))
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(m (modulo len 8))
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(bv (get-bytevector-n p len))
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(str (utf8->string bv)))
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(or (zero? m)
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(get-bytevector-n p (- 8 m)))
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str))
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(define (read-latin1-string p)
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(let* ((len (read-int p))
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(m (modulo len 8))
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(str (get-string-n p len)))
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(or (zero? m)
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(get-bytevector-n p (- 8 m)))
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str))
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(define (write-string-list l p)
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(write-int (length l) p)
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(for-each (cut write-string <> p) l))
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(define (read-string-list p)
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(let ((len (read-int p)))
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(unfold (cut >= <> len)
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(lambda (i)
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(read-string p))
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1+
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0)))
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(define (write-store-path f p)
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(write-string f p)) ; TODO: assert path
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(define (read-store-path p)
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(read-string p)) ; TODO: assert path
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(define write-store-path-list write-string-list)
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(define read-store-path-list read-string-list)
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(define (write-contents file p)
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"Write the contents of FILE to output port P."
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(define (dump in size)
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(define buf-size 65536)
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(define buf (make-bytevector buf-size))
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(let loop ((left size))
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(if (<= left 0)
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0
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(let ((read (get-bytevector-n! in buf 0 buf-size)))
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(if (eof-object? read)
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left
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(begin
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(put-bytevector p buf 0 read)
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(loop (- left read))))))))
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(let ((size (stat:size (lstat file))))
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(write-string "contents" p)
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(write-long-long size p)
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(call-with-input-file file
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(lambda (p)
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(dump p size)))
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(write-padding size p)))
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(define (write-file f p)
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(define %archive-version-1 "nix-archive-1")
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(write-string %archive-version-1 p)
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(let dump ((f f))
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(let ((s (lstat f)))
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(write-string "(" p)
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(case (stat:type s)
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((regular)
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(write-string "type" p)
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(write-string "regular" p)
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(if (not (zero? (logand (stat:mode s) #o100)))
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(begin
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(write-string "executable" p)
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(write-string "" p)))
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(write-contents f p))
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((directory)
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(write-string "type" p)
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(write-string "directory" p)
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(let ((entries (remove (cut member <> '("." ".."))
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(scandir f))))
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(for-each (lambda (e)
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(let ((f (string-append f "/" e)))
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(write-string "entry" p)
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(write-string "(" p)
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(write-string "name" p)
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(write-string e p)
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(write-string "node" p)
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(dump f)
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(write-string ")" p)))
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entries)))
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(else
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(error "ENOSYS")))
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(write-string ")" p))))
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;; Information about a substitutable store path.
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(define-record-type <substitutable>
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(substitutable path deriver refs dl-size nar-size)
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substitutable?
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(path substitutable-path)
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(deriver substitutable-deriver)
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(refs substitutable-references)
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(dl-size substitutable-download-size)
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(nar-size substitutable-nar-size))
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(define (read-substitutable-path-list p)
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(let loop ((len (read-int p))
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(result '()))
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(if (zero? len)
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(reverse result)
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(let ((path (read-store-path p))
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(deriver (read-store-path p))
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(refs (read-store-path-list p))
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(dl-size (read-long-long p))
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(nar-size (read-long-long p)))
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(loop (- len 1)
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(cons (substitutable path deriver refs dl-size nar-size)
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result))))))
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(define-syntax write-arg
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(syntax-rules (integer boolean file string string-list
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store-path store-path-list base16)
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((_ integer arg p)
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(write-int arg p))
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((_ boolean arg p)
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(write-int (if arg 1 0) p))
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((_ file arg p)
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(write-file arg p))
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((_ string arg p)
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(write-string arg p))
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((_ string-list arg p)
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(write-string-list arg p))
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((_ store-path arg p)
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(write-store-path arg p))
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((_ store-path-list arg p)
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(write-store-path-list arg p))
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((_ base16 arg p)
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(write-string (bytevector->base16-string arg) p))))
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(define-syntax read-arg
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(syntax-rules (integer boolean string store-path store-path-list
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substitutable-path-list base16)
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((_ integer p)
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(read-int p))
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((_ boolean p)
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(not (zero? (read-int p))))
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((_ string p)
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(read-string p))
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((_ store-path p)
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(read-store-path p))
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((_ store-path-list p)
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(read-store-path-list p))
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((_ substitutable-path-list p)
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(read-substitutable-path-list p))
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((_ base16 p)
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(base16-string->bytevector (read-string p)))))
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;; remote-store.cc
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(define-record-type <nix-server>
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(%make-nix-server socket major minor
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ats-cache atts-cache)
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nix-server?
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(socket nix-server-socket)
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(major nix-server-major-version)
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(minor nix-server-minor-version)
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;; Caches. We keep them per-connection, because store paths build
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;; during the session are temporary GC roots kept for the duration of
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;; the session.
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(ats-cache nix-server-add-to-store-cache)
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(atts-cache nix-server-add-text-to-store-cache))
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(define-condition-type &nix-error &error
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nix-error?)
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(define-condition-type &nix-connection-error &nix-error
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nix-connection-error?
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(file nix-connection-error-file)
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(errno nix-connection-error-code))
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(define-condition-type &nix-protocol-error &nix-error
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nix-protocol-error?
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(message nix-protocol-error-message)
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(status nix-protocol-error-status))
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(define* (open-connection #:optional (file (%daemon-socket-file))
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#:key (reserve-space? #t))
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"Connect to the daemon over the Unix-domain socket at FILE. When
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RESERVE-SPACE? is true, instruct it to reserve a little bit of extra
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space on the file system so that the garbage collector can still
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operate, should the disk become full. Return a server object."
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(let ((s (with-fluids ((%default-port-encoding #f))
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;; This trick allows use of the `scm_c_read' optimization.
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(socket PF_UNIX SOCK_STREAM 0)))
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(a (make-socket-address PF_UNIX file)))
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;; Enlarge the receive buffer.
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(setsockopt s SOL_SOCKET SO_RCVBUF (* 12 1024))
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||
(catch 'system-error
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(cut connect s a)
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(lambda args
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;; Translate the error to something user-friendly.
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(let ((errno (system-error-errno args)))
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(raise (condition (&nix-connection-error
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(file file)
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(errno errno)))))))
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(write-int %worker-magic-1 s)
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(let ((r (read-int s)))
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||
(and (eqv? r %worker-magic-2)
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(let ((v (read-int s)))
|
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(and (eqv? (protocol-major %protocol-version)
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(protocol-major v))
|
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(begin
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(write-int %protocol-version s)
|
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(if (>= (protocol-minor v) 11)
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(write-int (if reserve-space? 1 0) s))
|
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(let ((s (%make-nix-server s
|
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(protocol-major v)
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(protocol-minor v)
|
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(make-hash-table 100)
|
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(make-hash-table 100))))
|
||
(let loop ((done? (process-stderr s)))
|
||
(or done? (process-stderr s)))
|
||
s))))))))
|
||
|
||
(define (close-connection server)
|
||
"Close the connection to SERVER."
|
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(close (nix-server-socket server)))
|
||
|
||
(define current-build-output-port
|
||
;; The port where build output is sent.
|
||
(make-parameter (current-error-port)))
|
||
|
||
(define (process-stderr server)
|
||
"Read standard output and standard error from SERVER, writing it to
|
||
CURRENT-BUILD-OUTPUT-PORT. Return #t when SERVER is done sending data, and
|
||
#f otherwise; in the latter case, the caller should call `process-stderr'
|
||
again until #t is returned or an error is raised.
|
||
|
||
Since the build process's output cannot be assumed to be UTF-8, we
|
||
conservatively consider it to be Latin-1, thereby avoiding possible
|
||
encoding conversion errors."
|
||
(define p
|
||
(nix-server-socket server))
|
||
|
||
;; magic cookies from worker-protocol.hh
|
||
(define %stderr-next #x6f6c6d67)
|
||
(define %stderr-read #x64617461) ; data needed from source
|
||
(define %stderr-write #x64617416) ; data for sink
|
||
(define %stderr-last #x616c7473)
|
||
(define %stderr-error #x63787470)
|
||
|
||
(let ((k (read-int p)))
|
||
(cond ((= k %stderr-write)
|
||
(read-latin1-string p)
|
||
#f)
|
||
((= k %stderr-read)
|
||
(let ((len (read-int p)))
|
||
(read-latin1-string p) ; FIXME: what to do?
|
||
#f))
|
||
((= k %stderr-next)
|
||
(let ((s (read-latin1-string p)))
|
||
(display s (current-build-output-port))
|
||
#f))
|
||
((= k %stderr-error)
|
||
(let ((error (read-latin1-string p))
|
||
(status (if (>= (nix-server-minor-version server) 8)
|
||
(read-int p)
|
||
1)))
|
||
(raise (condition (&nix-protocol-error
|
||
(message error)
|
||
(status status))))))
|
||
((= k %stderr-last)
|
||
;; The daemon is done (see `stopWork' in `nix-worker.cc'.)
|
||
#t)
|
||
(else
|
||
(raise (condition (&nix-protocol-error
|
||
(message "invalid error code")
|
||
(status k))))))))
|
||
|
||
(define* (set-build-options server
|
||
#:key keep-failed? keep-going? try-fallback?
|
||
(verbosity 0)
|
||
(max-build-jobs (current-processor-count))
|
||
(max-silent-time 3600)
|
||
(use-build-hook? #t)
|
||
(build-verbosity 0)
|
||
(log-type 0)
|
||
(print-build-trace #t)
|
||
(build-cores 1)
|
||
(use-substitutes? #t)
|
||
(binary-caches '())) ; client "untrusted" cache URLs
|
||
;; Must be called after `open-connection'.
|
||
|
||
(define socket
|
||
(nix-server-socket server))
|
||
|
||
(let-syntax ((send (syntax-rules ()
|
||
((_ (type option) ...)
|
||
(begin
|
||
(write-arg type option socket)
|
||
...)))))
|
||
(write-int (operation-id set-options) socket)
|
||
(send (boolean keep-failed?) (boolean keep-going?)
|
||
(boolean try-fallback?) (integer verbosity)
|
||
(integer max-build-jobs) (integer max-silent-time))
|
||
(if (>= (nix-server-minor-version server) 2)
|
||
(send (boolean use-build-hook?)))
|
||
(if (>= (nix-server-minor-version server) 4)
|
||
(send (integer build-verbosity) (integer log-type)
|
||
(boolean print-build-trace)))
|
||
(if (>= (nix-server-minor-version server) 6)
|
||
(send (integer build-cores)))
|
||
(if (>= (nix-server-minor-version server) 10)
|
||
(send (boolean use-substitutes?)))
|
||
(if (>= (nix-server-minor-version server) 12)
|
||
(send (string-list (fold-right (lambda (pair result)
|
||
(match pair
|
||
((h . t)
|
||
(cons* h t result))))
|
||
'()
|
||
binary-caches))))
|
||
(let loop ((done? (process-stderr server)))
|
||
(or done? (process-stderr server)))))
|
||
|
||
(define-syntax operation
|
||
(syntax-rules ()
|
||
"Define a client-side RPC stub for the given operation."
|
||
((_ (name (type arg) ...) docstring return ...)
|
||
(lambda (server arg ...)
|
||
docstring
|
||
(let ((s (nix-server-socket server)))
|
||
(write-int (operation-id name) s)
|
||
(write-arg type arg s)
|
||
...
|
||
;; Loop until the server is done sending error output.
|
||
(let loop ((done? (process-stderr server)))
|
||
(or done? (loop (process-stderr server))))
|
||
(values (read-arg return s) ...))))))
|
||
|
||
(define-syntax-rule (define-operation (name args ...)
|
||
docstring return ...)
|
||
(define name
|
||
(operation (name args ...) docstring return ...)))
|
||
|
||
(define-operation (valid-path? (string path))
|
||
"Return #t when PATH is a valid store path."
|
||
boolean)
|
||
|
||
(define-operation (query-path-hash (store-path path))
|
||
"Return the SHA256 hash of PATH as a bytevector."
|
||
base16)
|
||
|
||
(define add-text-to-store
|
||
;; A memoizing version of `add-to-store', to avoid repeated RPCs with
|
||
;; the very same arguments during a given session.
|
||
(let ((add-text-to-store
|
||
(operation (add-text-to-store (string name) (string text)
|
||
(string-list references))
|
||
#f
|
||
store-path)))
|
||
(lambda (server name text references)
|
||
"Add TEXT under file NAME in the store, and return its store path.
|
||
REFERENCES is the list of store paths referred to by the resulting store
|
||
path."
|
||
(let ((args `(,text ,name ,references))
|
||
(cache (nix-server-add-text-to-store-cache server)))
|
||
(or (hash-ref cache args)
|
||
(let ((path (add-text-to-store server name text references)))
|
||
(hash-set! cache args path)
|
||
path))))))
|
||
|
||
(define add-to-store
|
||
;; A memoizing version of `add-to-store'. This is important because
|
||
;; `add-to-store' leads to huge data transfers to the server, and
|
||
;; because it's often called many times with the very same argument.
|
||
(let ((add-to-store (operation (add-to-store (string basename)
|
||
(boolean fixed?) ; obsolete, must be #t
|
||
(boolean recursive?)
|
||
(string hash-algo)
|
||
(file file-name))
|
||
#f
|
||
store-path)))
|
||
(lambda (server basename recursive? hash-algo file-name)
|
||
"Add the contents of FILE-NAME under BASENAME to the store. When
|
||
RECURSIVE? is true and FILE-NAME designates a directory, the contents of
|
||
FILE-NAME are added recursively; if FILE-NAME designates a flat file and
|
||
RECURSIVE? is true, its contents are added, and its permission bits are
|
||
kept. HASH-ALGO must be a string such as \"sha256\"."
|
||
(let* ((st (stat file-name #f))
|
||
(args `(,st ,basename ,recursive? ,hash-algo))
|
||
(cache (nix-server-add-to-store-cache server)))
|
||
(or (and st (hash-ref cache args))
|
||
(let ((path (add-to-store server basename #t recursive?
|
||
hash-algo file-name)))
|
||
(hash-set! cache args path)
|
||
path))))))
|
||
|
||
(define-operation (build-derivations (string-list derivations))
|
||
"Build DERIVATIONS, and return when the worker is done building them.
|
||
Return #t on success."
|
||
boolean)
|
||
|
||
(define-operation (add-temp-root (store-path path))
|
||
"Make PATH a temporary root for the duration of the current session.
|
||
Return #t."
|
||
boolean)
|
||
|
||
(define-operation (add-indirect-root (string file-name))
|
||
"Make FILE-NAME an indirect root for the garbage collector; FILE-NAME
|
||
can be anywhere on the file system, but it must be an absolute file
|
||
name--it is the caller's responsibility to ensure that it is an absolute
|
||
file name. Return #t on success."
|
||
boolean)
|
||
|
||
(define references
|
||
(operation (query-references (store-path path))
|
||
"Return the list of references of PATH."
|
||
store-path-list))
|
||
|
||
(define referrers
|
||
(operation (query-referrers (store-path path))
|
||
"Return the list of path that refer to PATH."
|
||
store-path-list))
|
||
|
||
(define valid-derivers
|
||
(operation (query-valid-derivers (store-path path))
|
||
"Return the list of valid \"derivers\" of PATH---i.e., all the
|
||
.drv present in the store that have PATH among their outputs."
|
||
store-path-list))
|
||
|
||
(define query-derivation-outputs ; avoid name clash with `derivation-outputs'
|
||
(operation (query-derivation-outputs (store-path path))
|
||
"Return the list of outputs of PATH, a .drv file."
|
||
store-path-list))
|
||
|
||
(define-operation (has-substitutes? (store-path path))
|
||
"Return #t if binary substitutes are available for PATH, and #f otherwise."
|
||
boolean)
|
||
|
||
(define substitutable-paths
|
||
(operation (query-substitutable-paths (store-path-list paths))
|
||
"Return the subset of PATHS that is substitutable."
|
||
store-path-list))
|
||
|
||
(define substitutable-path-info
|
||
(operation (query-substitutable-paths (store-path-list paths))
|
||
"Return information about the subset of PATHS that is
|
||
substitutable. For each substitutable path, a `substitutable?' object is
|
||
returned."
|
||
substitutable-path-list))
|
||
|
||
(define (run-gc server action to-delete min-freed)
|
||
"Perform the garbage-collector operation ACTION, one of the
|
||
`gc-action' values. When ACTION is `delete-specific', the TO-DELETE is
|
||
the list of store paths to delete. IGNORE-LIVENESS? should always be
|
||
#f. MIN-FREED is the minimum amount of disk space to be freed, in
|
||
bytes, before the GC can stop. Return the list of store paths delete,
|
||
and the number of bytes freed."
|
||
(let ((s (nix-server-socket server)))
|
||
(write-int (operation-id collect-garbage) s)
|
||
(write-int action s)
|
||
(write-store-path-list to-delete s)
|
||
(write-arg boolean #f s) ; ignore-liveness?
|
||
(write-long-long min-freed s)
|
||
(write-int 0 s) ; obsolete
|
||
(when (>= (nix-server-minor-version server) 5)
|
||
;; Obsolete `use-atime' and `max-atime' parameters.
|
||
(write-int 0 s)
|
||
(write-int 0 s))
|
||
|
||
;; Loop until the server is done sending error output.
|
||
(let loop ((done? (process-stderr server)))
|
||
(or done? (loop (process-stderr server))))
|
||
|
||
(let ((paths (read-store-path-list s))
|
||
(freed (read-long-long s))
|
||
(obsolete (read-long-long s)))
|
||
(values paths freed))))
|
||
|
||
(define-syntax-rule (%long-long-max)
|
||
;; Maximum unsigned 64-bit integer.
|
||
(- (expt 2 64) 1))
|
||
|
||
(define (live-paths server)
|
||
"Return the list of live store paths---i.e., store paths still
|
||
referenced, and thus not subject to being garbage-collected."
|
||
(run-gc server (gc-action return-live) '() (%long-long-max)))
|
||
|
||
(define (dead-paths server)
|
||
"Return the list of dead store paths---i.e., store paths no longer
|
||
referenced, and thus subject to being garbage-collected."
|
||
(run-gc server (gc-action return-dead) '() (%long-long-max)))
|
||
|
||
(define* (collect-garbage server #:optional (min-freed (%long-long-max)))
|
||
"Collect garbage from the store at SERVER. If MIN-FREED is non-zero,
|
||
then collect at least MIN-FREED bytes. Return the paths that were
|
||
collected, and the number of bytes freed."
|
||
(run-gc server (gc-action delete-dead) '() min-freed))
|
||
|
||
(define* (delete-paths server paths #:optional (min-freed (%long-long-max)))
|
||
"Delete PATHS from the store at SERVER, if they are no longer
|
||
referenced. If MIN-FREED is non-zero, then stop after at least
|
||
MIN-FREED bytes have been collected. Return the paths that were
|
||
collected, and the number of bytes freed."
|
||
(run-gc server (gc-action delete-specific) paths min-freed))
|
||
|
||
|
||
;;;
|
||
;;; Store paths.
|
||
;;;
|
||
|
||
(define %store-prefix
|
||
;; Absolute path to the Nix store.
|
||
(make-parameter (or (and=> (getenv "NIX_STORE_DIR") canonicalize-path)
|
||
%store-directory)))
|
||
|
||
(define (store-path? path)
|
||
"Return #t if PATH is a store path."
|
||
;; This is a lightweight check, compared to using a regexp, but this has to
|
||
;; be fast as it's called often in `derivation', for instance.
|
||
;; `isStorePath' in Nix does something similar.
|
||
(string-prefix? (%store-prefix) path))
|
||
|
||
(define (derivation-path? path)
|
||
"Return #t if PATH is a derivation path."
|
||
(and (store-path? path) (string-suffix? ".drv" path)))
|
||
|
||
(define (store-path-package-name path)
|
||
"Return the package name part of PATH, a file name in the store."
|
||
(define store-path-rx
|
||
(make-regexp (string-append "^.*" (regexp-quote (%store-prefix))
|
||
"/[^-]+-(.+)$")))
|
||
|
||
(and=> (regexp-exec store-path-rx path)
|
||
(cut match:substring <> 1)))
|