[bug#49425] [PATCH] guix-install.sh: Prompt for configuring substitutes discovery.

[Maxim Cournoyer]

Also ensure prompt_yes_no always print the message with a trailing space,
which is more pleasing to the eye.

* etc/guix-daemon.conf.in <--discovery=no>: New guix-daemon option.
* etc/guix-daemon.service.in: Likewise.
* etc/init.d/guix-daemon.in: Likewise.
* etc/openrc/guix-daemon.in: Likewise.
* etc/guix-install.sh (configure_substitute_discovery): New procedure.
(sys_enable_guix_daemon): Ask the user whether automatic substitute discovery
should be enabled.  Set the '--discovery' argument accordingly.
(prompt_yes_no): Add a trailing space to the message.
(sys_authorize_build_farms): Remove trailing space from the message argument.
* NEWS (Distribution): Add news.
---
 NEWS                       |  4 +++-
 etc/guix-daemon.conf.in    |  2 +-
 etc/guix-daemon.service.in |  3 ++-
 etc/guix-install.sh        | 22 ++++++++++++++++++++--
 etc/init.d/guix-daemon.in  |  2 +-
 etc/openrc/guix-daemon.in  |  2 +-
 6 files changed, 28 insertions(+), 7 deletions(-)

diff --git a/NEWS b/NEWS
index b0647b3700..ad9433a921 100644
--- a/NEWS
+++ b/NEWS
@@ -14,7 +14,9 @@ Please send Guix bug reports to bug-guix@gnu.org.
 
 * Changes in 1.4.0 (since 1.3.0)
 ** Package management
-   * New 'deb' format for the 'guix pack' command
+*** New 'deb' format for the 'guix pack' command
+** Distribution
+*** The installation script can now configure substitute discovery
 
 * Changes in 1.3.0 (since 1.2.0)
 ** Package management
diff --git a/etc/guix-daemon.conf.in b/etc/guix-daemon.conf.in
index 755192d555..b122ca8c7a 100644
--- a/etc/guix-daemon.conf.in
+++ b/etc/guix-daemon.conf.in
@@ -7,4 +7,4 @@ start on runlevel [2345]
 
 stop on runlevel [016]
 
-exec @localstatedir@/guix/profiles/per-user/root/current-guix/bin/guix-daemon 
--build-users-group=guixbuild
+exec @localstatedir@/guix/profiles/per-user/root/current-guix/bin/guix-daemon 
--build-users-group=guixbuild --discovery=no
diff --git a/etc/guix-daemon.service.in b/etc/guix-daemon.service.in
index 407cdd199c..17b54eaeb0 100644
--- a/etc/guix-daemon.service.in
+++ b/etc/guix-daemon.service.in
@@ -6,7 +6,8 @@
 Description=Build daemon for GNU Guix
 
 [Service]
-ExecStart=@localstatedir@/guix/profiles/per-user/root/current-guix/bin/guix-daemon
 --build-users-group=guixbuild
+ExecStart=@localstatedir@/guix/profiles/per-user/root/current-guix/bin/guix-daemon
 \
+    --build-users-group=guixbuild --discover=no
 
Environment='GUIX_LOCPATH=@localstatedir@/guix/profiles/per-user/root/guix-profile/lib/locale'
 LC_ALL=en_US.utf8
 RemainAfterExit=yes
 StandardOutput=syslog
diff --git a/etc/guix-install.sh b/etc/guix-install.sh
index 6a799fa823..1e7702d4c5 100755
--- a/etc/guix-install.sh
+++ b/etc/guix-install.sh
@@ -96,7 +96,7 @@ _debug()
 # $1: The prompt question.
 prompt_yes_no() {
     while true; do
-        read -rp "$1" yn
+        read -rp "$1 " yn
         case $yn in
             [Yy]*) return 0;;
             [Nn]*) return 1;;
@@ -249,6 +249,16 @@ chk_sys_nscd()
     fi
 }
 
+# Configure substitute discovery according to user's preferences.
+# $1 is the installed service file to edit.
+configure_substitute_discovery() {
+if grep -q -- '--discover=no' "$1" && \
+        prompt_yes_no "Would you like to enable automatic substitute \
+discovery? (yes/no)"; then
+    sed -i 's/--discover=no/--discover=yes/' "$1"
+fi
+}
+
 # 
------------------------------------------------------------------------------
 #+MAIN
 
@@ -397,6 +407,7 @@ sys_enable_guix_daemon()
             { initctl reload-configuration;
               cp 
"~root/.config/guix/current/lib/upstart/system/guix-daemon.conf" \
                  /etc/init/ &&
+                  configure_substitute_discovery /etc/init/guix-daemon.conf &&
                   start guix-daemon; } &&
                 _msg "${PAS}enabled Guix daemon via upstart"
             ;;
@@ -426,6 +437,9 @@ sys_enable_guix_daemon()
                        -e 's/^Environment=\(.*\)$/Environment=\1 
LC_ALL=en_US.UTF-8';
               fi;
 
+              configure_substitute_discovery \
+                  /etc/systemd/system/guix-daemon.service
+
               systemctl daemon-reload &&
                   systemctl enable guix-daemon &&
                   systemctl start  guix-daemon; } &&
@@ -437,6 +451,8 @@ sys_enable_guix_daemon()
                  /etc/init.d/guix-daemon;
               chmod 775 /etc/init.d/guix-daemon;
 
+              configure_substitute_discovery /etc/init.d/guix-daemon
+
               update-rc.d guix-daemon defaults &&
                   update-rc.d guix-daemon enable &&
                   service guix-daemon start; } &&
@@ -448,6 +464,8 @@ sys_enable_guix_daemon()
                  /etc/init.d/guix-daemon;
               chmod 775 /etc/init.d/guix-daemon;
 
+              configure_substitute_discovery /etc/init.d/guix-daemon
+
               rc-update add guix-daemon default &&
                   rc-service guix-daemon start; } &&
                 _msg "${PAS}enabled Guix daemon via OpenRC"
@@ -472,7 +490,7 @@ sys_enable_guix_daemon()
 sys_authorize_build_farms()
 { # authorize the public key of the build farm
     if prompt_yes_no "Permit downloading pre-built package binaries from the \
-project's build farm? (yes/no) "; then
+project's build farm? (yes/no)"; then
         guix archive --authorize \
              < "~root/.config/guix/current/share/guix/ci.guix.gnu.org.pub" \
             && _msg "${PAS}Authorized public key for ci.guix.gnu.org"
diff --git a/etc/init.d/guix-daemon.in b/etc/init.d/guix-daemon.in
index 1cc49fed89..b7d4bb72bb 100644
--- a/etc/init.d/guix-daemon.in
+++ b/etc/init.d/guix-daemon.in
@@ -36,7 +36,7 @@ start)
       -E LC_ALL=en_US.utf8 \
       -p "/var/run/guix-daemon.pid" \
       @localstatedir@/guix/profiles/per-user/root/current-guix/bin/guix-daemon 
\
-      --build-users-group=guixbuild
+      --build-users-group=guixbuild --discover=no
   fi
   ;;
 stop)
diff --git a/etc/openrc/guix-daemon.in b/etc/openrc/guix-daemon.in
index 110a58b88d..eeedc2a840 100644
--- a/etc/openrc/guix-daemon.in
+++ b/etc/openrc/guix-daemon.in
@@ -20,7 +20,7 @@
 export 
GUIX_LOCPATH=@localstatedir@/guix/profiles/per-user/root/guix-profile/lib/locale
 export LC_ALL=en_US.utf8
 
command="@localstatedir@/guix/profiles/per-user/root/current-guix/bin/guix-daemon"
-command_args="--build-users-group=guixbuild"
+command_args="--build-users-group=guixbuild --discover=no"
 command_background="yes"
 pidfile="/var/run/guix-daemon.pid"
 
-- 
2.32.0