/usr/bin/gnunet-download-manager is in gnunet 0.10.1-2.1build2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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exec guile -e main -s "$0" "$@"
!#
;;; gnunet-download-manager -- Manage GNUnet downloads.
;;; Copyright (C) 2004 Ludovic Courtès
;;;
;;; This program 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 2
;;; of the License, or (at your option) any later version.
;;;
;;; This program 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 this program; if not, write to the Free Software
;;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
;;; Remember ongoing GNUnet downloads so as to be able to resume them
;;; later. Typical usage is to define the following alias in your
;;; favorite shell:
;;;
;;; alias gnunet-download='gnunet-download-manager.scm download'
;;;
;;; You may have a ~/.gnunet-download-manager.scm Scheme configuration
;;; file. In particular, if you would like to be notified of
;;; completed downloads, you may want to add the following line to
;;; your configuration file:
;;;
;;; (add-hook! *completed-download-hook*
;;; completed-download-notification-hook)
;;;
;;; This script works fine with GNU Guile 1.6.4, and doesn't run with
;;; Guile 1.4.x.
;;;
;;; Enjoy!
;;; Ludovic Courtès <ludo@chbouib.org>
(use-modules (ice-9 format)
(ice-9 optargs)
(ice-9 regex)
(ice-9 and-let-star)
(ice-9 pretty-print)
(ice-9 documentation))
;; Overall user settings
(define *debug?* #f)
(define *rc-file* (string-append (getenv "HOME")
"/.gnunet-download-manager.scm"))
(define *status-directory* (string-append (getenv "HOME") "/"
".gnunet-download-manager"))
(define *gnunet-download* "gnunet-download")
;; Helper macros
(define-macro (gnunet-info fmt . args)
`(format #t (string-append *program-name* ": " ,fmt "~%")
,@args))
(define-macro (gnunet-debug fmt . args)
(if *debug?*
(cons 'gnunet-info (cons fmt args))
#t))
(define-macro (gnunet-error fmt . args)
`(and ,(cons 'gnunet-info (cons fmt args))
(exit 1)))
(define (exception-string key args)
"Describe an error, using the format from @var{args}, if available."
(if (< (length args) 4)
(format #f "Scheme exception: ~S" key)
(string-append
(if (string? (car args))
(string-append "In " (car args))
"Scheme exception")
": "
(apply format `(#f ,(cadr args) ,@(caddr args))))))
;; Regexps matching GNUnet URIs
(define *uri-base*
"([[:alnum:]]+)\.([[:alnum:]]+)\.([[:alnum:]]+)\.([0-9]+)")
(define *uri-re*
(make-regexp (string-append "^gnunet://afs/" *uri-base* "$")
regexp/extended))
(define *uri-status-file-re*
(make-regexp (string-append "^" *uri-base* "$")
regexp/extended))
(define (uri-status-file-name directory uri)
"Return the name of the status file for URI @var{uri}."
(let ((match (regexp-exec *uri-re* uri)))
(if (not match)
(and (gnunet-info "~a: Invalid URI" uri) #f)
(let ((start (match:start match 1))
(end (match:end match 4)))
(string-append directory "/"
(substring uri start end))))))
(define (uri-status directory uri)
"Load the current status alist for URI @var{uri} from @var{directory}."
(gnunet-debug "uri-status")
(let ((filename (uri-status-file-name directory uri)))
(catch 'system-error
(lambda ()
(let* ((file (open-input-file filename))
(status (read file)))
(begin
(close-port file)
status)))
(lambda (key . args)
(and (gnunet-debug (exception-string key args))
'())))))
(define (process-exists? pid)
(false-if-exception (begin (kill pid 0) #t)))
(define (fork-and-exec directory program . args)
"Launch @var{program} and return its PID."
(gnunet-debug "fork-and-exec: ~a ~a" program args)
(let ((pid (primitive-fork)))
(if (= 0 pid)
(begin
(if directory (chdir directory))
(apply execlp (cons program (cons program args))))
pid)))
(define* (start-downloader downloader uri options
#:key (directory #f))
"Start the GNUnet downloader for URI @var{uri} with options
@var{options}. Return an alist describing the download status."
(catch 'system-error
(lambda ()
(let* ((pid (apply fork-and-exec
`(,(if directory directory (getcwd))
,downloader
,@options))))
(gnunet-info "Launched process ~a" pid)
`((uri . ,uri)
(working-directory . ,(if directory directory (getcwd)))
(options . ,options)
(pid . ,(getpid))
(downloader-pid . ,pid))))
(lambda (key . args)
(gnunet-error (exception-string key args)))))
(define (download-process-alive? uri-status)
"Return true if the download whose status is that described by
@var{uri-status} is still alive."
(let ((pid (assoc-ref uri-status 'pid))
(downloader-pid (assoc-ref uri-status 'downloader-pid)))
(and (process-exists? pid)
(process-exists? downloader-pid))))
(define (start-file-download downloader status-dir uri options)
"Dowload the file located at @var{uri}, with options @var{options}
and return an updated status alist."
(gnunet-debug "start-file-download")
(let ((uri-status (uri-status status-dir uri)))
(if (null? uri-status)
(acons 'start-date (current-time)
(start-downloader downloader uri options))
(if (download-process-alive? uri-status)
(and (gnunet-info "~a already being downloaded by process ~a"
uri (assoc-ref uri-status 'pid))
#f)
(and (gnunet-info "Resuming download")
(let ((start-date (assoc-ref uri-status 'start-date))
(dir (assoc-ref uri-status 'working-directory))
(options (assoc-ref uri-status 'options)))
(acons 'start-date start-date
(start-downloader downloader uri options
#:directory dir))))))))
(define *completed-download-hook* (make-hook 1))
(define (download-file downloader status-dir uri options)
"Start downloading file located at URI @var{uri}, with options
@var{options}, resuming it if it's already started."
(catch 'system-error
(lambda ()
(and-let* ((status (start-file-download downloader
status-dir
uri options))
(pid (assoc-ref status 'downloader-pid))
(filename (uri-status-file-name status-dir
uri))
(file (open-file filename "w")))
;; Write down the status
(pretty-print status file)
(close-port file)
;; Wait for `gnunet-download'
(gnunet-info "Waiting for process ~a" pid)
(let* ((process-status (waitpid pid))
(exit-val (status:exit-val (cdr process-status)))
(term-sig (status:term-sig (cdr process-status))))
;; Terminate
(delete-file filename)
(gnunet-info
"Download completed (PID ~a, exit code ~a)"
pid exit-val)
(let ((ret `((end-date . ,(current-time))
(exit-code . ,exit-val)
(terminating-signal . ,term-sig)
,@status)))
(run-hook *completed-download-hook* ret)
ret))))
(lambda (key . args)
(gnunet-error (exception-string key args)))))
(define (uri-status-files directory)
"Return the list of URI status files in @var{directory}."
(catch 'system-error
(lambda ()
(let ((dir (opendir directory)))
(let loop ((filename (readdir dir))
(file-list '()))
(if (eof-object? filename)
file-list
(if (regexp-exec *uri-status-file-re* filename)
(loop (readdir dir)
(cons filename file-list))
(loop (readdir dir) file-list))))))
(lambda (key . args)
(gnunet-error (exception-string key args)))))
(define (output-file-option option-list)
"Return the output file specified in @var{option-list}, false if
anavailable."
(if (null? option-list)
#f
(let ((rest (cdr option-list))
(opt (car option-list)))
(if (null? rest)
#f
(if (or (string=? opt "-o")
(string=? opt "--output"))
(car rest)
(output-file-option rest))))))
(define (download-command . args)
"Start downloading a file using the given `gnunet-download'
arguments."
(gnunet-debug "download-command")
(let* ((argc (length args))
;; FIXME: We're assuming the URI is the last argument
(uri (car (list-tail args (- argc 1))))
(options args))
(download-file *gnunet-download* *status-directory* uri options)))
(define (status-command . args)
"Print status info about files being downloaded."
(for-each (lambda (status)
(format #t "~a: ~a~% ~a~% ~a~% ~a~%"
(assoc-ref status 'uri)
(if (download-process-alive? status)
(string-append "running (PID "
(number->string (assoc-ref status
'pid))
")")
"not running")
(string-append "Started on "
(strftime "%c"
(localtime (assoc-ref
status
'start-date))))
(string-append "Directory: "
(assoc-ref status
'working-directory))
(string-append "Output file: "
(or (output-file-option (assoc-ref
status
'options))
"<unknown>"))))
(map (lambda (file)
(uri-status *status-directory*
(string-append "gnunet://afs/" file)))
(uri-status-files *status-directory*))))
(define (resume-command . args)
"Resume stopped downloads."
(for-each (lambda (status)
(if (not (download-process-alive? status))
(if (= 0 (primitive-fork))
(let* ((ret (download-file *gnunet-download*
*status-directory*
(assoc-ref status 'uri)
(assoc-ref status 'options)))
(code (assoc-ref ret 'exit-code)))
(exit code)))))
(map (lambda (file)
(uri-status *status-directory*
(string-append "gnunet://afs/" file)))
(uri-status-files *status-directory*))))
(define (killall-command . args)
"Stop all running downloads."
(for-each (lambda (status)
(if (download-process-alive? status)
(let ((pid (assoc-ref status 'pid))
(dl-pid (assoc-ref status 'downloader-pid)))
(and (gnunet-info "Stopping processes ~a and ~a"
pid dl-pid)
(kill pid 15)
(kill dl-pid 15)))))
(map (lambda (file)
(uri-status *status-directory*
(string-append "gnunet://afs/" file)))
(uri-status-files *status-directory*))))
(define (help-command . args)
"Show this help message."
(format #t "Usage: ~a <command> [options]~%" *program-name*)
(format #t "Where <command> may be one of the following:~%~%")
(for-each (lambda (command)
(if (not (eq? (cdr command) help-command))
(format #t (string-append " " (car command) ": "
(object-documentation
(cdr command))
"~%"))))
*commands*)
(format #t "~%"))
(define (settings-command . args)
"Dump the current settings."
(format #t "Current settings:~%~%")
(module-for-each (lambda (symbol variable)
(if (string-match "^\\*.*\\*$" (symbol->string symbol))
(format #t " ~a: ~a~%"
symbol (variable-ref variable))))
(current-module))
(format #t "~%"))
(define (version-command . args)
"Show version information."
(format #t "~a ~a.~a (~a)~%"
*program-name* *version-major* *version-minor* *version-date*))
;; This hook may be added to *completed-download-hook*.
(define (completed-download-notification-hook status)
"Notifies of the completion of a file download."
(let ((msg (string-append "GNUnet download of "
(output-file-option
(assoc-ref status 'options))
" in "
(assoc-ref status
'working-directory)
" complete!")))
(if (getenv "DISPLAY")
(waitpid (fork-and-exec #f "xmessage" msg))
(waitpid (fork-and-exec #f "write"
(cuserid) msg)))))
;; Available user commands
(define *commands*
`(("download" . ,download-command)
("status" . ,status-command)
("resume" . ,resume-command)
("killall" . ,killall-command)
("settings" . ,settings-command)
("version" . ,version-command)
("help" . ,help-command)
("--help" . ,help-command)
("-h" . ,help-command)))
(define *program-name* "gnunet-download-manager")
(define *version-major* 0)
(define *version-minor* 1)
(define *version-date* "april 2004")
(define (main args)
(set! *program-name* (basename (car args)))
;; Load the user's configuration file
(if (file-exists? *rc-file*)
(load *rc-file*))
;; Check whether the status directory already exists
(if (not (file-exists? *status-directory*))
(begin
(gnunet-info "Creating status directory ~a..." *status-directory*)
(catch 'system-error
(lambda ()
(mkdir *status-directory*))
(lambda (key . args)
(and (gnunet-error (exception-string key args))
(exit 1))))))
;; Go ahead
(if (< (length args) 2)
(and (format #t "Usage: ~a <command> [options]~%"
*program-name*)
(exit 1))
(let* ((command-name (cadr args))
(command (assoc-ref *commands* command-name)))
(if command
(apply command (cddr args))
(and (gnunet-info "~a command not found" command-name)
(exit 1))))))
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