;;; GNU Guix --- Functional package management for GNU ;;; Copyright © 2015 David Thompson <davet@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 container exec) #:use-module (ice-9 match) #:use-module (srfi srfi-1) #:use-module (srfi srfi-11) #:use-module (srfi srfi-37) #:use-module (guix scripts) #:use-module (guix ui) #:use-module (guix utils) #:use-module (gnu build linux-container) #:export (guix-container-exec)) (define %options (list (option '(#\h "help") #f #f (lambda args (show-help) (exit 0))) (option '(#\V "version") #f #f (lambda args (show-version-and-exit "guix container exec"))))) (define (show-help) (display (G_ "Usage: guix container exec PID COMMAND [ARGS...] Execute COMMMAND within the container process PID.\n")) (newline) (display (G_ " -h, --help display this help and exit")) (display (G_ " -V, --version display version information and exit")) (newline) (show-bug-report-information)) (define (partition-args args) "Split ARGS into two lists; one containing the arguments for this program, and the other containing arguments for the command to be executed." (define (number-string? str) (false-if-exception (string->number str))) (let loop ((a '()) (b args)) (match b (() (values (reverse a) '())) (((? number-string? head) . tail) (values (reverse (cons head a)) tail)) ((head . tail) (loop (cons head a) tail))))) (define (guix-container-exec . args) (define (handle-argument arg result) (if (assoc-ref result 'pid) (leave (G_ "~a: extraneous argument~%") arg) (alist-cons 'pid (string->number* arg) result))) (with-error-handling (let-values (((args command) (partition-args args))) (let* ((opts (parse-command-line args %options '(()) #:argument-handler handle-argument)) (pid (assoc-ref opts 'pid)) (environment (filter-map (lambda (name) (let ((value (getenv name))) (and value (cons name value)))) ;; Pass through the TERM environment ;; variable to inform processes about ;; the capabilities of the terminal. '("TERM")))) (unless pid (leave (G_ "no pid specified~%"))) (when (null? command) (leave (G_ "no command specified~%"))) (unless (file-exists? (string-append "/proc/" (number->string pid))) (leave (G_ "no such process ~d~%") pid)) (let ((result (container-excursion pid (lambda () (match command ((program . program-args) (for-each (match-lambda ((name . value) (setenv name value))) environment) (apply execlp program program program-args))))))) (unless (zero? result) (leave (G_ "exec failed with status ~d~%") result)))))))