X-Git-Url: https://iankelling.org/git/?a=blobdiff_plain;f=pxe-server;h=e59854a85e466be75cbad22733ded83cae6c077e;hb=2f13039525488532756a089b8329ab6ee64a6c17;hp=4d18ccb742dcad33e9d9691372a0e711e4ac4ef8;hpb=e6da963744f05fc92ba515f1544fbbc0773f4d2f;p=automated-distro-installer

diff --git a/pxe-server b/pxe-server
index 4d18ccb..e59854a 100755
--- a/pxe-server
+++ b/pxe-server
@@ -1,39 +1,181 @@
-#!/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.
 
-# usage: $0 [TYPE]
-# default distro is the base debian/fedora type. others are fai &  arch
+# usage: $0 TYPE
+# default distro is the base debian/fedora type. others are fai & arch.
+# for no pxe server, use a no-op like : or true.
 
 set -eE -o pipefail
-trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?"' ERR
+trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
+
+
+usage() {
+    cat <<EOF
+Usage: ${0##*/} [OPTIONS] [HOST TYPE]
+Configure dnsmasq pxe server options and fai-chboot if appropriate.
+
+
+Without HOST TYPE, disable pxe server and fai server.
+TYPE is one of arch, plain, fai.
+HOST is a hostname known to the dhcp server, or default for all
+Note, when switching between plain and arch, you will need to
+do something like:
+ssh wrt
+cd /mnt/usb
+rm tftpboot
+ln -s <arch/debian iso dir> tftpboot
+
+
+-r         Don't redeploy fai config. For example, if there is a different host
+           that is mid-install.
+-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.
+-w         Initially setup pxe, then wait like -a.
+-h|--help  Print help and exit
+
+
+Note: Uses GNU getopt options parsing style
+EOF
+    exit $1
+}
+
+##### begin command line parsing ########
 
-action=${1:-default}
+args=()
+redep=true
+acks=2
+wait=false
+temp=$(getopt -l help harw "$@") || usage 1
+eval set -- "$temp"
+while true; do
+    case $1 in
+        -a) wait=true; set=false; shift ;;
+        -r) redep=false; shift ;;
+        -w) wait=true; set=true; shift ;;
+        -h|--help) usage ;;
+        --) shift; break ;;
+        *) echo "$0: Internal error!" ; exit 1 ;;
+    esac
+done
+
+read host type <<<"$@"
+
+case $# in
+    0|2);;
+    *)
+        echo "$0: error: expected 0 or 2 arguments"
+        echo
+        usage 1
+        ;;
+esac
+
+if [[ $host ]]; then
+    host_tag="tag:$host,"
+fi
+
+##### end command line parsing ########
+
+e() {
+    echo "$@"
+    "$@"
+}
 
 arch() {
-    default
-    cat <<'EOF'
+    cat <<EOF
 dhcp-option-force=209,boot/syslinux/archiso.cfg
 dhcp-option-force=210,/arch/
-dhcp-boot=/arch/boot/syslinux/lpxelinux.0
+dhcp-boot=${host_tag}/arch/boot/syslinux/lpxelinux.0
 EOF
 }
 
-default() {
-    cat <<'EOF'
-enable-tftp
-tftp-root=/mnt/usb/tftpboot
-dhcp-boot=pxelinux.0
+plain() {
+    # if arch was used before, this additionally needs
+    # the tftp link in /mnt/usb to be changed.
+    cat <<EOF
+dhcp-boot=${host_tag}pxelinux.0
 EOF
 }
 
 fai() {
-    cat <<'EOF'
-dhcp-boot=fai/pxelinux.0,faiserver.lan,faiserver.lan
+    cat <<EOF
+$set_host_tag
+dhcp-boot=${host_tag}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
+}
+
+set-pxe() {
+    ${type:-:}|ssh wrt "cedit pxe /etc/dnsmasq.conf || /etc/init.d/dnsmasq restart
+$([[ $type == arch ]] && echo arch-pxe-mount)"
+}
+
+
+if $set; then
+    set-pxe
+    if [[ $type == fai ]]; then
+        e myfai-chboot $host
+        if $redep; then
+            e fai-redep
+        fi
+    else
+        e myfai-chboot
+    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
+    type=
+    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.
 
-$action | ssh wrt "cedit pxe-server /etc/dnsmasq.conf || /etc/init.d/dnsmasq restart
-if [[ $action == arch ]]; then arch-pxe-mount; fi"
+    # if [[ $type == fai ]]; then
+    #     echo "waiting for 1 dhcp ack then disabling fai server"
+    #     ack-wait 1
+    #     faiserver-disable
+    # fi
+fi