bug#36498: modem["ttyUSB0"]: error starting PPP: Could not find "pppd" binary

["pelzflorian (Florian Pelz)" <pelzflorian@pelzflorian.de>]

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On Thu, Jul 04, 2019 at 04:46:32PM +0200, pelzflorian (Florian Pelz) wrote:
> I suppose the attached patch could help.  It builds, but I could not
> test.
> 
> Adam, could you try it?  Just follow the Guix manual’s instructions on
> Contributing and `git am the-attached-patch`.
> 

Only if ./pre-inst-env guix system reconfigure with the patch before
is not sufficient, could you try the one attached here instead?  (git
reset --hard master, then git am this-new-patch and reconfigure.)

Regards,
Florian

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From 6eea4f17af471a85dd89adce3acb895fc0fd341f Mon Sep 17 00:00:00 2001
From: Florian Pelz <pelzflorian@pelzflorian.de>
Date: Thu, 4 Jul 2019 17:56:34 +0200
Subject: [PATCH] gnu: network-manager: Add ppp input, configure flag and
 substitute to use it.

* gnu/packages/gnome.scm (network-manager): Add them.
---
 gnu/packages/gnome.scm | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/gnu/packages/gnome.scm b/gnu/packages/gnome.scm
index 2820be0022..9ab0d15df6 100644
--- a/gnu/packages/gnome.scm
+++ b/gnu/packages/gnome.scm
@@ -5313,6 +5313,9 @@ users.")
                    (("systemd") "elogind"))
                  (substitute* "./src/nm-logging.c"
                    (("systemd") "elogind"))
+                 (substitute* "src/ppp/nm-ppp-manager.c"
+                   (("nm_utils_find_helper \\(\"pppd\".*")
+                    "PPPD_PATH;"))
                  #t))))
     (build-system gnu-build-system)
     (outputs '("out"
@@ -5322,7 +5325,9 @@ users.")
        (let ((out      (assoc-ref %outputs "out"))
              (doc      (assoc-ref %outputs "doc"))
              (dhclient (string-append (assoc-ref %build-inputs "isc-dhcp")
-                                      "/sbin/dhclient")))
+                                      "/sbin/dhclient"))
+             (pppd (string-append (assoc-ref %build-inputs "ppp")
+                                  "/sbin/pppd")))
          (list "--with-systemd-logind=yes" ;In Guix System, this is provided by elogind.
                "--with-consolekit=no"
                "--with-crypto=gnutls"
@@ -5335,7 +5340,8 @@ users.")
                               out "/etc/dbus-1/system.d")
                (string-append "--with-html-dir="
                               doc "/share/gtk-doc/html")
-               (string-append "--with-dhclient=" dhclient)))
+               (string-append "--with-dhclient=" dhclient)
+               (string-append "--with-pppd=" pppd)))
        #:phases
        (modify-phases %standard-phases
          (add-before 'configure 'pre-configure
@@ -5395,6 +5401,7 @@ users.")
        ("libxslt" ,libxslt)
        ("libxml2" ,libxml2)
        ("pkg-config" ,pkg-config)
+       ("ppp" ,ppp)
        ;; For testing.
        ("python" ,python-wrapper)
        ("python-dbus" ,python-dbus)
-- 
2.22.0