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;; This file is part of scheme-GNUnet, a partial Scheme port of GNUnet.
;; Copyright (C) 2021 GNUnet e.V.
;;
;; GNUnet is free software: you can redistribute it and/or modify it
;; under the terms of the GNU Affero General Public License as published
;; by the Free Software Foundation, either version 3 of the License,
;; or (at your option) any later version.
;;
;; GNUnet 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
;; Affero General Public License for more details.
;;
;; You should have received a copy of the GNU Affero General Public License
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
;;
;; SPDX-License-Identifier: AGPL-3.0-or-later
;; Brief: publish an item of the store (GNU Guix) to GNUnet
;;
;; A quirk of the GNUnet's directory format to keep in mind:
;; * the basename of the directory is saved in the .gnd
;; * the basename of regular files that are published
;; as-is isn't saved (but is included in the surrounding
;; .gnd)
;;
;; The format used here is a SXML tree, as that seems most
;; simple to use with Guix' @code{write-file-tree}.
(library (gnu gnunet scripts publish-store)
;; XXX check exports
(export main
store-item->sxml
directory->sxmls
publish-object
gnunet-publish)
(import (rnrs base)
(rnrs io simple)
(ice-9 optargs)
(ice-9 getopt-long)
(gnu gnunet scripts guix-stuff)
(only (ice-9 ftw) scandir)
(only (srfi srfi-1) member)
(only (guile)
basename
readlink
logand
lstat
stat:type
stat:perms
stat:size)
(guile)
(only (srfi srfi-1)
concatenate)
(srfi srfi-26)
(srfi srfi-39)
(rnrs bytevectors)
(ice-9 binary-ports)
(ice-9 textual-ports)
(ice-9 regex)
(ice-9 popen)
(ice-9 rdelim)
(sxml match)
(only (ice-9 optargs)
define*))
(begin
(define %options-specification
`((version (single-char #\v))
(help (single-char #\h))
(format (single-char #\f)
(value #t)
(predicate ,(cute member <> '("gnunet-nar-sxml/0"))))
(input (single-char #\i)
(value #t))
(nar (value #t))
(simulate (single-char #\s))
;; Debugging options
(display-sxml)
;; GNUnet options
(config (single-char #\c)
(value #t))
(anonymity (single-char #\a)
(value #t))
(noindex (single-char #\n))
(priority (single-char #\p)
(value #t))
(replication (single-char #\r)
(value #t))))
(define *simulate* (make-parameter #f))
(define *display-sxml* (make-parameter #f))
(define *config*
(make-parameter (string-append (getenv "HOME")
"/.config/gnunet.conf")))
(define *anonymity* (make-parameter 1))
(define *priority* (make-parameter 360))
(define *replication* (make-parameter 0))
(define *no-index* (make-parameter #f))
(define (call-with-options options thunk)
"Call the thunk @var{thunk} in an environment where
the options @var{options} are applied."
(define opt (cute option-ref options <> <>))
(define (num sym default)
(let ((value/str (opt sym #f)))
(if value/str
(string->number value/str)
default)))
(parameterize ((*simulate* (opt 'simulate (*simulate*)))
(*display-sxml* (opt 'display-sxml (*display-sxml*)))
(*config* (opt 'config (*config*)))
(*anonymity* (num 'anonymity (*anonymity*)))
(*priority* (num 'priority (*priority*)))
(*replication* (num 'replication (*replication*)))
(*no-index* (opt 'noindex (*no-index*))))
(thunk)))
(define %help
"Usage: publish-store --input=INPUT --config=CONFIG [OPTION]...
Publish a (GNU Guix, or Nix) store item INPUT into GNUnet.
-v, --version Print version information
-h, --help Print this message
-s, --simulate Do not actually publish INPUT, only print the
computed URI
-f, --format Format for representing a store item,
currently gnunet-nar-sxml/0
-i, --input Store item to publish
--nar Publish a nar instead
Debugging options
--display-sxml Display generated SXML to stdout
GNUnet options
-c, --config GNUnet configuration for publishing
-a, --anonymity Anonymity level for publishing
-p, --priority Priority level for publishing (360 by default)
-r, --replication Desired replication level (0 by default)
-n, --noindex Do not store files by name in the local GNUnet")
(define (main arguments)
(inner-main arguments)
(exit 0))
(define (inner-main arguments)
(let ((options (getopt-long arguments %options-specification)))
(cond ((option-ref options 'version #f)
(display "scheme-gnunet publish-store v0.0"
(current-output-port))
(newline (current-output-port)))
((option-ref options 'help #f)
(display %help (current-output-port))
(newline (current-output-port)))
((equal? (option-ref options 'format "gnunet-nar-sxml/0")
"gnunet-nar-sxml/0")
(let ((result
(call-with-options
options
(lambda ()
(publish-nar/sxml/1
#:input (option-ref options 'input #f))))))
(format (current-output-port)
"Published at ~a in ~a format~%"
result "gnunet-nar-sxml/0")))
(else ???))))
(define* (publish-nar/sxml/1 #:key input)
(let* ((sxml (store-item->sxml input))
(sxml/hashed (sxml-publish-leaves! sxml #:include-name? #f)))
(when (*display-sxml*)
(write (current-output-port) sxml/hashed))
(publish-object (string->utf8 (object->string sxml/hashed)))))
(define gnunet-publish-uri-regexp
(make-regexp "\\b(gnunet://fs/chk/([A-Z0-9]+).([A-Z0-9]+).[0-9]+)\\b"))
(define (extract-uri output)
(match:substring (regexp-exec gnunet-publish-uri-regexp output) 1))
(define (gnunet-publish file)
"Run the GNUnet publish binary, and return the computed hash
as a string."
(setenv "LC_ALL" "C")
(let* ((*binary* "gnunet-publish")
;; FIXME for some reason
;; setting anonymity to 0
;; causes a hang
(anonymity (if (= (*anonymity*) 0)
1
(*anonymity*)))
(cmd `(,*binary*
"--disable-extractor"
"-a" ,(number->string anonymity)
"-p" ,(number->string (*priority*))
"-r" ,(number->string (*replication*))
,@(if (*config*)
`("-c" ,(*config*))
'())
,@(if (*simulate*)
'("-s")
'())
,@(if (*no-index*)
'("-n")
'())
"--"
,file))
(pipe (apply open-pipe* OPEN_READ cmd))
(text-0 (read-line pipe))
(text-1 (read-line pipe))
(ret (close-pipe pipe)))
(unless (= ret 0)
;; XXX
(throw 'gnunet-publish-eep 'gnunet-publish-???))
(extract-uri text-1)))
(define* (sxml-publish-leaves! sxml #:key (include-name? #t))
"Publish SXML, an SXML as returned by store-item->sxml,
and return a SXML where the on-disk filenames are replaced
by the corresponding GNUnet URIs. If INCLUDE-NAME? is false,
the name of the top-level entry is not included in the returned
SXML."
(define (maybe-name name)
(if include-name?
`((name ,name))
'()))
(sxml-match sxml
((regular (@ (name ,name)
(executable? ,executable?)
(data-from-file ,filename)))
`(regular (@ ,@(maybe-name name)
(executable? ,executable?)
(hash ,(publish-object filename)))))
((symlink (@ (name ,name)
(target ,target)))
`(symlink (@ ,@(maybe-name name)
(target ,target))))
((directory (@ (name ,name))
. ,rest)
`(directory (@ ,@(maybe-name name))
. ,(map sxml-publish-leaves! rest)))))
(define (publish-object data)
"Publish DATA, a bytevector or filename, and return
the resulting GNUnet FS URI. If SIMULATE is #t, do not
actually publish the file, only compute its hash."
(cond ((bytevector? data)
(call-with-temporary-output-file
(lambda (name port)
(put-bytevector port data)
(close-port port)
(parameterize ((*no-index* #t))
(gnunet-publish name)))))
((string? data) (gnunet-publish data))))
(define (store-item->sxml filename)
(let* ((name (basename filename))
(stat (lstat filename))
(type (stat:type stat))
(perms (stat:perms stat))
(executable?
(= (logand perms #o0001)
#o0001)))
(case (stat:type stat)
((regular)
`(regular (@ (name ,name)
(size ,(stat:size stat))
(executable? ,executable?)
(data-from-file ,filename))))
((directory)
`(directory (@ (name ,name))
,@(directory->sxmls filename)))
((symlink)
`(symlink (@ (name ,name)
(target ,(readlink filename)))))
(else ???))))
(define (directory->sxmls filename)
(let ((names (scandir filename
(lambda (n)
(not (member n '("." ".."))))
string<?)))
(map (lambda (name)
(let ((file (string-append filename "/" name)))
(store-item->sxml file)))
names)))))
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