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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2015 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (guix scripts size)
#:use-module (guix ui)
#:use-module (guix store)
#:use-module (guix monads)
#:use-module (guix utils)
#:use-module (guix packages)
#:use-module (guix derivations)
#:use-module (gnu packages)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-9)
#:use-module (srfi srfi-11)
#:use-module (srfi srfi-34)
#:use-module (srfi srfi-37)
#:use-module (ice-9 ftw)
#:use-module (ice-9 match)
#:use-module (ice-9 format)
#:export (profile?
profile-file
profile-self-size
profile-closure-size
store-profile
guix-size))
;; Size profile of a store item.
(define-record-type <profile>
(profile file self-size closure-size)
profile?
(file profile-file) ;store item
(self-size profile-self-size) ;size in bytes
(closure-size profile-closure-size)) ;size of dependencies in bytes
(define (file-size file)
"Return the size of bytes of FILE, entering it if FILE is a directory."
(file-system-fold (const #t)
(lambda (file stat result) ;leaf
(+ (stat:size stat) result))
(lambda (directory stat result) ;down
(+ (stat:size stat) result))
(lambda (directory stat result) ;up
result)
(lambda (file stat result) ;skip
result)
(lambda (file stat errno result)
(format (current-error-port)
"file-size: ~a: ~a~%" file
(strerror errno))
result)
0
file
lstat))
(define substitutable-path-info*
(store-lift substitutable-path-info))
(define (store-item-exists? item)
"Return #t if ITEM is in the store, and protect it from GC. Otherwise
return #f."
(lambda (store)
(add-temp-root store item)
(values (valid-path? store item) store)))
(define (file-size* item)
"Like 'file-size', but resort to information from substitutes if ITEM is not
in the store."
(mlet %store-monad ((exists? (store-item-exists? item)))
(if exists?
(return (file-size item))
(mlet %store-monad ((info (substitutable-path-info* (list item))))
(match info
((info)
;; The nar size is an approximation, but a good one.
(return (substitutable-nar-size info)))
(()
(leave (_ "no available substitute information for '~a'~%")
item)))))))
(define* (display-profile profile #:optional (port (current-output-port)))
"Display PROFILE, a list of PROFILE objects, to PORT."
(define MiB (expt 2 20))
(format port "~64a ~8a ~a\n"
(_ "store item") (_ "total") (_ "self"))
(let ((whole (reduce + 0 (map profile-self-size profile))))
(for-each (match-lambda
(($ <profile> name self total)
(format port "~64a ~6,1f ~6,1f ~5,1f%\n"
name (/ total MiB) (/ self MiB)
(* 100. (/ self whole 1.)))))
(sort profile
(match-lambda*
((($ <profile> _ _ total1) ($ <profile> _ _ total2))
(> total1 total2)))))))
(define display-profile*
(lift display-profile %store-monad))
(define (substitutable-requisites store item)
"Return the list of requisites of ITEM based on information available in
substitutes."
(let loop ((items (list item))
(result '()))
(match items
(()
(delete-duplicates result))
(items
(let ((info (substitutable-path-info store
(delete-duplicates items))))
(loop (remove (lambda (item) ;XXX: complexity
(member item result))
(append-map substitutable-references info))
(append (append-map substitutable-references info)
result)))))))
(define (requisites* item)
"Return as a monadic value the requisites of ITEMS, based either on the
information available in the local store or using information about
substitutes."
(lambda (store)
(guard (c ((nix-protocol-error? c)
(values (substitutable-requisites store item)
store)))
(values (requisites store item) store))))
(define (store-profile item)
"Return as a monadic value a list of <profile> objects representing the
profile of ITEM and its requisites."
(mlet* %store-monad ((refs (>>= (requisites* item)
(lambda (refs)
(return (delete-duplicates
(cons item refs))))))
(sizes (mapm %store-monad
(lambda (item)
(>>= (file-size* item)
(lambda (size)
(return (cons item size)))))
refs)))
(define (dependency-size item)
(mlet %store-monad ((deps (requisites* item)))
(foldm %store-monad
(lambda (item total)
(return (+ (assoc-ref sizes item) total)))
0
(delete-duplicates (cons item deps)))))
(mapm %store-monad
(match-lambda
((item . size)
(mlet %store-monad ((dependencies (dependency-size item)))
(return (profile item size dependencies)))))
sizes)))
(define* (ensure-store-item spec-or-item)
"Return a store file name. If SPEC-OR-ITEM is a store file name, return it
as is. Otherwise, assume SPEC-OR-ITEM is a package output specification such
as \"guile:debug\" or \"gcc-4.8\" and return its store file name."
(with-monad %store-monad
(if (store-path? spec-or-item)
(return spec-or-item)
(let-values (((package output)
(specification->package+output spec-or-item)))
(mlet %store-monad ((drv (package->derivation package)))
;; Note: we don't try building DRV like 'guix archive' does
;; because we don't have to since we can instead rely on
;; substitute meta-data.
(return (derivation->output-path drv output)))))))
;;;
;;; Options.
;;;
(define (show-help)
(display (_ "Usage: guix size [OPTION]... PACKAGE
Report the size of PACKAGE and its dependencies.\n"))
(display (_ "
-s, --system=SYSTEM consider packages for SYSTEM--e.g., \"i686-linux\""))
(newline)
(display (_ "
-h, --help display this help and exit"))
(display (_ "
-V, --version display version information and exit"))
(newline)
(show-bug-report-information))
(define %options
;; Specifications of the command-line options.
(list (option '(#\s "system") #t #f
(lambda (opt name arg result)
(alist-cons 'system arg
(alist-delete 'system result eq?))))
(option '(#\h "help") #f #f
(lambda args
(show-help)
(exit 0)))
(option '(#\V "version") #f #f
(lambda args
(show-version-and-exit "guix size")))))
(define %default-options
`((system . ,(%current-system))))
;;;
;;; Entry point.
;;;
(define (guix-size . args)
(with-error-handling
(let* ((opts (parse-command-line args %options (list %default-options)))
(files (filter-map (match-lambda
(('argument . file) file)
(_ #f))
opts))
(system (assoc-ref opts 'system)))
(match files
(()
(leave (_ "missing store item argument\n")))
((file)
(with-store store
(run-with-store store
(mlet* %store-monad ((item (ensure-store-item file))
(profile (store-profile item)))
(display-profile* profile))
#:system system)))
((files ...)
(leave (_ "too many arguments\n")))))))
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