cleanup docs, getopt arg parsing

[automated-distro-installer] / pxe-server

diff --git a/pxe-server b/pxe-server
index 4fcf40c134cd472d3ba50aaa26687298846c5da1..6b6a5765e2571c2550cc64b53ffbbed24bdba2ea 100755 (executable)
--- a/pxe-server
+++ b/pxe-server
@@ -1,4 +1,19 @@
-#!/bin/bash -x
+#!/bin/bash
+# Copyright (C) 2016 Ian Kelling
+
+# This program 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 2
+# of the License, or (at your option) any later version.
+
+# This program 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 this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
 # Setup dhcp server to point to tftp server,
 # and depending on the type, setup the tftp server.
@@ -19,27 +34,39 @@ One line description
 TYPE is one of arch, plain, fai, or : for no pxe server.
 HOST makes the pxe server only for that specific host
 
+-r         Don't redeploy fai config.
+-a         Wait for 2 dhcp acks, then disable the pxe server after a delay.
+           First ack is for pxe boot, 2nd ack is for os boot. Sometimes
+           on debian, there is a 3rd one shortly after the 2nd. I can't remember
+           exactly why this caused a problem, but I'm hoping the sleep
+           will take care of it.
 -h|--help  Print help and exit
---         Subsequent arguments are never treated as options
+
+
+Note: Uses GNU getopt options parsing style
 EOF
     exit $1
 }
 
 ##### begin command line parsing ########
 
-
 args=()
-while [[ $1 ]]; do
+redep=true
+acks=2
+wait=false
+temp=$(getopt -l help hra "$@") || usage 1
+eval set -- "$temp"
+while true; do
     case $1 in
-        --) shift; break ;;
         -h|--help) usage ;;
-        *) args+=("$1"); shift ;;
+        -r) redep=false; shift ;;
+        -a) wait=true; shift ;;
+        --) shift; break ;;
+        *) echo "$0: Internal error!" ; exit 1 ;;
     esac
 done
-args+=("$@")
-
 
-read type host <<<"${args[@]}"
+read type host <<<"$@"
 
 if [[ ! $type ]]; then
     echo "$0: error: exptected 1 argument of type"
@@ -52,8 +79,12 @@ fi
 
 ##### end command line parsing ########
 
+e() {
+    echo "$@"
+    "$@"
+}
+
 arch() {
-    plain
     cat <<EOF
 dhcp-option-force=209,boot/syslinux/archiso.cfg
 dhcp-option-force=210,/arch/
@@ -65,8 +96,6 @@ plain() {
     # if arch was used before, this additionally needs
     # the tftp link in /mnt/usb to be changed.
     cat <<EOF
-enable-tftp
-tftp-root=/mnt/usb/tftpboot
 dhcp-boot=${host_tag}pxelinux.0
 EOF
 }
@@ -78,6 +107,56 @@ dhcp-boot=${host_tag}fai/pxelinux.0,faiserver.lan,faiserver.lan
 EOF
 }
 
+ack-wait() {
+    wait_count=$1
+    if [[ $host ]]; then
+        host_regex=" $host"
+    fi
+    regex=".*DHCPACK.*$host_regex$"
+    i=0
+    tmp=$(mktemp)
+    while (( i != wait_count )) && read line; do
+        if [[ $line =~ $regex ]]; then
+            i=$((i+1))
+            echo $line
+        fi
+    done < <(ssh wrt logread -f)
+    e sleep 20
+}
 
-$type | ssh wrt "cedit pxe-server /etc/dnsmasq.conf || /etc/init.d/dnsmasq restart
+set-pxe() {
+    ${1:-$type} | ssh wrt "cedit pxe-server /etc/dnsmasq.conf || /etc/init.d/dnsmasq restart
 if [[ $type == arch ]]; then arch-pxe-mount; fi"
+}
+
+if ! $wait && [[ $type != : ]]; then
+    set-pxe
+
+    if [[ $type == fai ]]; then
+        if $redep; then
+            fai-redep
+        fi
+        faiserver-enable
+    fi
+fi
+
+if $wait; then
+    # fai's debian jessie 8.5ish does 2 dhcp requests when booting,
+    # roughly 4 seconds apart. Earlier
+    # versions did just 1. Now testing on a vm, it does 1.
+    # bleh.
+    echo "waiting for $acks dhcp acks then disabling pxe"
+    ack-wait $acks
+    set-pxe :
+
+    # previously tried waiting for one more ack then disabling faiserver,
+    # since it can contain sensitive info, so turn it off when not in use,
+    # but disabling that for now as it's inconvenient to clean this
+    # up and run it in the background etc.
+
+    # if [[ $type == fai ]]; then
+    #     echo "waiting for 1 dhcp ack then disabling fai server"
+    #     ack-wait 1
+    #     faiserver-disable
+    # fi
+fi