From b4bd21c722da92de409962d8b0032760bd39b35b Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Sat, 25 Mar 2017 09:01:25 +0200
Subject: Configure email

---
 bootstrap      |  9 +++++----
 doc/manual.cli | 22 ++++++++++++++++++++--
 init           | 51 ++++++++++++++++++++++++++++++++++++++++++++++++---
 3 files changed, 73 insertions(+), 9 deletions(-)

diff --git a/bootstrap b/bootstrap
index 240f193..0d17ba1 100755
--- a/bootstrap
+++ b/bootstrap
@@ -147,7 +147,7 @@ if [ "$stage" -eq "1" ]; then
   pkgs+=",hdparm,btrfs-progs"
 
   pkgs+=",net-tools,iproute2,iptables,isc-dhcp-client"
-  pkgs+=",ifupdown,bridge-utils,dnsmasq,ntp"
+  pkgs+=",ifupdown,bridge-utils,dnsmasq,ntp,postfix"
   pkgs+=",iputils-ping,wget,curl"
 
   pkgs+=",less"
@@ -240,11 +240,11 @@ chpasswd <<<'root:$passwd'
 
 # Enable IPv4 forwarding (used for private bridge NAT).
 #
-sed -i 's/^# *\(net.ipv4.ip_forward\).*/\1=1/' /etc/sysctl.conf
+sed -i -e 's/^# *\(net.ipv4.ip_forward\).*/\1=1/' /etc/sysctl.conf
 
 # Setup locale. We only support en_US.UTF-8.
 #
-sed -i 's/^# *\(en_US.UTF-8\)/\1/' /etc/locale.gen
+sed -i -e 's/^# *\(en_US.UTF-8\)/\1/' /etc/locale.gen
 locale-gen --purge
 
 cat <<EOF1 >/etc/default/locale
@@ -386,4 +386,5 @@ sudo kvm \
   -m 8G \
   -netdev 'tap,id=net0,script=./qemu-ifup' \
   -device "e1000,netdev=net0,mac=$macaddr" \
-  -kernel buildos-image -initrd buildos-initrd
+  -kernel buildos-image -initrd buildos-initrd \
+  -append "buildos.smtp_relay=build2.org buildos.admin_email=admin@build.org"
diff --git a/doc/manual.cli b/doc/manual.cli
index e5d6cf3..1140db5 100644
--- a/doc/manual.cli
+++ b/doc/manual.cli
@@ -18,7 +18,7 @@ This document describes \c{buildos}, the \c{build2} operating system.
 
 \h1#intro|Introduction|
 
-\c{buildos} is a GNU/Linux(Debian)-based in-memory network-booted operating
+\c{buildos} is a Debian GNU/Linux-based in-memory network-booted operating
 system specialized for autonomous building of software using the \c{build2}
 toolchain. It's primary purpose is to run the \c{build2} build bot (\c{bbot}),
 build slave (\c{bslave}), or both.
@@ -69,7 +69,8 @@ timeout 50
 label buildos
   menu label buildos
   kernel /buildos/buildos-image
-  append initrd=/buildos/buildos-initrd
+  initrd /buildos/buildos-initrd
+  append buildos.smtp_relay=example.org buildos.admin_email=admin@example.org
 EOF
 \
 
@@ -125,4 +126,21 @@ instance by examining \c{/etc/network/interfaces}.
 
 @@ TODO: private network parameters.
 
+\h2#config-email|Email|
+
+A \c{buildos} instance sends various notifications (including all messages to
+\c{root}) to the admin email address. The admin email is specified with
+the \c{buildos.admin_email} kernel command line parameter.
+
+In order to deliver mail, the \c{postfix} MTA is configured to forward to a
+relay. The relay host is specified with the \c{buildos.smtp_relay} kernel
+command line parameter.
+
+Note that no authentication of any kind is configured for relaying. This means
+that the relay host should accept emails from build hosts either because of
+their network location (for example, because they are on your organization's
+local network and you are using your organization's relay) or because the
+relay host accepts emails send to the admin address from anyone (which is
+normally the case if the relay is the final destination for the admin
+address, for example, \c{example.org} and \c{admin@example.org}).
 "
diff --git a/init b/init
index 28ec293..a725372 100755
--- a/init
+++ b/init
@@ -52,10 +52,35 @@ SYSTEMD_LOG_LEVEL=info /lib/systemd/systemd-udevd --daemon --resolve-names=never
 udevadm trigger --action=add
 udevadm settle || true
 
-# Parse command line.
+# Parse the kernel command line. This is complicated by the fact that the
+# values can be quoted, for example:
 #
-cmdline="$(cat /proc/cmdline)"
-info "boot cmdline: $cmdline"
+# foo='foo fox'
+# bar="bar 'box'"
+#
+# First we separete quoted variables and arguments with newlines (giving
+# priority to assignments). Then we replace whitespaces with newline on
+# lines that don't contain quites. Finally, clean up by removing blank
+# lines.
+#
+readarray -t cmdline < <(cat /proc/cmdline | \
+  sed -r -e "s/([^ ]+=)?('[^']*'|\"[^\"]*\")/\n\1\2\n/g" | \
+  sed -r -e "/['\"]/!s/ /\n/g" |
+  sed -r -e '/^\s*$/d')
+
+# Enter all buildos variables as bash variables.
+#
+info "command line:"
+for v in "${cmdline[@]}"; do
+  var="$(sed -r -n -e 's/^buildos\.([^=]+)=.*$/\1/p' <<<"$v")" # Extract name.
+
+  if [ -n "$var" ]; then
+    val="$(sed -r -e 's/^[^=]+=(.*)$/\1/' <<<"$v")"            # Extract value.
+    val="$(sed -r -e "s/^('(.*)'|\"(.*)\")$/\2\3/" <<<"$val")" # Strip quoted.
+    info "  $var=$val"
+    declare "$var=$val"
+  fi
+done
 
 # Figure out network configuration and generate the corresponding
 # /etc/network/interfaces.
@@ -200,6 +225,26 @@ bind-interfaces
 dhcp-range=${priv_netbase}.10,${priv_netbase}.250,12h
 EOF
 
+# Configure Postfix.
+#
+cat <<<"$hname" >/etc/mailname
+
+sed -r -i \
+ -e "s%^(myhostname).*%\1 = $hname%" \
+ -e 's%^(mydestination).*%\1 = $myhostname, localhost.localdomain, localhost%' \
+ -e 's%^(mynetworks).*%\1 = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128%' \
+ -e "s%^(relayhost).*%\1 = $smtp_relay%" \
+ /etc/postfix/main.cf
+
+# Make admin alias for buildos.admin_email, redirect root to admin.
+#
+cat <<EOF >>/etc/aliases
+admin: $admin_email
+root: admin
+EOF
+
+newaliases
+
 /bin/bash
 
 # Hand off to systemd. But first arrange to keep console output (which
-- 
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