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