;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2017, 2018, 2019, 2020 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2020 Mathieu Othacehe <othacehe@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 (gnu build shepherd)
  #:use-module (gnu system file-systems)
  #:use-module (gnu build linux-container)
  #:use-module (guix build utils)
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-26)
  #:use</td></tr></table>
<table class='tabs'><tr><td>
<a href='/guix/about/'>about</a><a href='/guix/'>summary</a><a href='/guix/refs/?id=d6b5aa0b031f0e7091f7424ac616d1c4d10fed5b'>refs</a><a href='/guix/log/gnu/system/mapped-devices.scm'>log</a><a href='/guix/tree/gnu/system/mapped-devices.scm?id=d6b5aa0b031f0e7091f7424ac616d1c4d10fed5b'>tree</a><a class='active' href='/guix/commit/gnu/system/mapped-devices.scm?id=d6b5aa0b031f0e7091f7424ac616d1c4d10fed5b'>commit</a><a href='/guix/diff/gnu/system/mapped-devices.scm?id=d6b5aa0b031f0e7091f7424ac616d1c4d10fed5b'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/system/mapped-devices.scm'>
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<option value='grep'>log msg</option>
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<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/commit/?id=d6b5aa0b031f0e7091f7424ac616d1c4d10fed5b'>root</a>/<a href='/guix/commit/gnu?id=d6b5aa0b031f0e7091f7424ac616d1c4d10fed5b'>gnu</a>/<a href='/guix/commit/gnu/system?id=d6b5aa0b031f0e7091f7424ac616d1c4d10fed5b'>system</a>/<a href='/guix/commit/gnu/system/mapped-devices.scm?id=d6b5aa0b031f0e7091f7424ac616d1c4d10fed5b'>mapped-devices.scm</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='d6b5aa0b031f0e7091f7424ac616d1c4d10fed5b'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Ludovic Courtès &lt;ludo@gnu.org&gt;</td><td class='right'>2018-06-18 23:25:53 +0200</td></tr>
<tr><th>committer</th><td>Ludovic Courtès &lt;ludo@gnu.org&gt;</td><td class='right'>2018-06-18 23:25:53 +0200</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/guix/commit/gnu/system/mapped-devices.scm?id=d6b5aa0b031f0e7091f7424ac616d1c4d10fed5b'>d6b5aa0b031f0e7091f7424ac616d1c4d10fed5b</a> (<a href='/guix/patch/gnu/system/mapped-devices.scm?id=d6b5aa0b031f0e7091f7424ac616d1c4d10fed5b'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/guix/tree/?id=d6b5aa0b031f0e7091f7424ac616d1c4d10fed5b'>cdc198dca5fb504210de0d857901f21794468141</a> /<a href='/guix/tree/gnu/system/mapped-devices.scm?id=d6b5aa0b031f0e7091f7424ac616d1c4d10fed5b'>gnu/system/mapped-devices.scm</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/guix/commit/gnu/system/mapped-devices.scm?id=92d581a0fd9118d8586aff2746339007f67da232'>92d581a0fd9118d8586aff2746339007f67da232</a> (<a href='/guix/diff/gnu/system/mapped-devices.scm?id=d6b5aa0b031f0e7091f7424ac616d1c4d10fed5b&amp;id2=92d581a0fd9118d8586aff2746339007f67da232'>diff</a>)</td></tr><tr><th>download</th><td colspan='2' class='oid'><a href='/guix/snapshot/guix-d6b5aa0b031f0e7091f7424ac616d1c4d10fed5b.tar.gz'>guix-d6b5aa0b031f0e7091f7424ac616d1c4d10fed5b.tar.gz</a><br/><a href='/guix/snapshot/guix-d6b5aa0b031f0e7091f7424ac616d1c4d10fed5b.zip'>guix-d6b5aa0b031f0e7091f7424ac616d1c4d10fed5b.zip</a><br/></td></tr></table>
<div class='commit-subject'>build-self: Do not rely on '%store-database-directory'.</div><div class='commit-msg'>Guix'es older than one week don't have this variable so requiring it
would break things for them.

* build-aux/build-self.scm (%config-variables): Remove
'%store-database-directory'.
</div><div class='diffstat-header'><a href='/guix/diff/?id=d6b5aa0b031f0e7091f7424ac616d1c4d10fed5b'>Diffstat</a> (limited to 'gnu/system/mapped-devices.scm')</div><table summary='diffstat' class='diffstat'></table><div class='diffstat-summary'>0 files changed, 0 insertions, 0 deletions</div><table summary='diff' class='diff'><tr><td></td></tr></table></div> <!-- class=content -->
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n-container container-directory
                              mounts namespaces 1
                              (lambda ()
                                ;; First restore the default handlers.
                                (for-each (cut sigaction <> SIG_DFL)
                                          %precious-signals)

                                ;; Unblock any signals that have been blocked
                                ;; by the parent process.
                                (unblock-signals %precious-signals)

                                (mkdir-p "/var/run")
                                (clean-up pid-file)

                                (exec-command command
                                              #:user user
                                              #:group group
                                              #:log-file log-file
                                              #:directory directory
                                              #:environment-variables
                                              environment-variables)))))
      (if pid-file
          (if (or (memq 'mnt namespaces) (memq 'pid namespaces))
              (read-pid-file/container pid pid-file
                                       #:max-delay pid-file-timeout)
              (read-pid-file pid-file #:max-delay pid-file-timeout))
          pid))))

(define* (fork+exec-command/container command
                                      #:key pid
                                      #:allow-other-keys
                                      #:rest args)
  "This is a variant of 'fork+exec-command' procedure, that joins the
namespaces of process PID beforehand.  If there is no support for containers,
on Hurd systems for instance, fallback to direct forking."
  (define (strip-pid args)
    ;; TODO: Replace with 'strip-keyword-arguments' when that no longer pulls
    ;; in (guix config).
    (let loop ((args args)
               (result '()))
      (match args
        (()
         (reverse result))
        ((#:pid _ . rest)
         (loop rest result))
        ((head . rest)
         (loop rest (cons head result))))))

  (let ((container-support?
         (file-exists? "/proc/self/ns"))
        (fork-proc (lambda ()
                     (apply fork+exec-command command
                            (strip-pid args)))))
    (if container-support?
        (container-excursion* pid fork-proc)
        (fork-proc))))

;; Local Variables:
;; eval: (put 'container-excursion* 'scheme-indent-function 1)
;; End:

;;; shepherd.scm ends here