xcat-core/xCAT-server/lib/xcat/plugins/statelite.pm

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10 KiB
Perl
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package xCAT_plugin::statelite;
BEGIN
{
$::XCATROOT = $ENV{'XCATROOT'} ? $ENV{'XCATROOT'} : '/opt/xcat';
}
use lib "$::XCATROOT/lib/perl";
use xCAT::Table;
use Getopt::Long;
use File::Basename;
use File::Path;
use File::Copy;
use File::Find;
use Cwd;
use File::Temp;
use xCAT::Utils qw(genpassword);
use xCAT::SvrUtils;
use Data::Dumper;
Getopt::Long::Configure("bundling");
Getopt::Long::Configure("pass_through");
my $cmdname = "liteimg";
my $statedir = ".statelite";
my $verbose = "0";
sub handled_commands {
return {
$cmdname => "statelite"
}
}
# function to handle request. Basically, get the information
# about the image and then do the action on it. Is that vague enough?
sub process_request {
my $request = shift;
my $callback = shift;
my $doreq = shift;
my $sitetab = xCAT::Table->new('site');
my $ent = $sitetab->getAttribs({key=>'installdir'},['value']);
my $installroot = "/install";
# get /install directory
if ($ent and $ent->{value}) {
$installroot = $ent->{value};
}
# if not defined, error out... or should we set it as default?
unless ($installroot) {
$callback->({error=>["No installdir defined in site table"],errorcode=>[1]});
return;
}
@ARGV = @{$request->{arg}};
my $argc = scalar @ARGV;
if ($argc == 0) {
$callback->({info=>["$cmdname -h # this help message\n$cmdname -v # version\n$cmdname -V # verbose\n$cmdname [-p profile] [-a architecture] [-o OS]\n$cmdname imagename"]});
return;
}
my $osver;
my $arch;
my $profile;
my $rootimg_dir;
my $destdir;
my $imagename;
GetOptions(
"profile|p=s" => \$profile,
"arch|a=s" => \$arch,
"osver|o=s" => \$osver,
"help|h" => \$help,
"version|v" => \$version,
"verbose|V" => \$verbose
);
if ($version) {
my $version = xCAT::Utils->Version();
$callback->({info=>[$version]});
return;
}
if ($help) {
# $callback->({info=>["packimage -h \npackimage -v \npackimage [-p profile] [-a architecture] [-o OS] \npackimage imagename"]});
$callback->({info=>["imglite... prep an image to be lite"]});
return;
}
# if they only gave us the image name:
if (@ARGV > 0) {
$imagename=$ARGV[0];
if ($arch or $osver or $profile) {
$callback->({error=>["-o, -p and -a options are not allowed when a image name is specified."],errorcode=>[1]});
return;
}
#load the module in memory
eval {require("$::XCATROOT/lib/perl/xCAT/Table.pm")};
if ($@) {
$callback->({error=>[$@],errorcode=>[1]});
return;
}
#get the info from the osimage and linux
my $osimagetab=xCAT::Table->new('osimage', -create=>1);
if (!$osimagetab) {
# os image doesn't exist in table.
$callback->({error=>["The osimage table cannot be opened."],errorcode=>[1]});
return;
}
# open the linux image table to get more attributes... for later.
my $linuximagetab=xCAT::Table->new('linuximage', -create=>1);
if (!$linuximagetab) {
$callback->({error=>["The linuximage table cannot be opened."],errorcode=>[1]});
return;
}
# get the os, arch, and profile from the image name table.
(my $ref) = $osimagetab->getAttribs({imagename => $imagename}, 'osvers', 'osarch', 'profile');
if (!$ref) {
$callback->({error=>["Cannot find image \'$imagename\' from the osimage table."],errorcode=>[1]});
return;
}
$osver=$ref->{'osvers'};
$arch=$ref->{'osarch'};
$profile=$ref->{'profile'};
} # end of case where they give us osimage.
unless ($osver and $arch and $profile ) {
$callback->({error=>["osimage.osvers, osimage.osarch, and osimage.profile and must be specified for the image $imagename in the database, or you must specify -o os -p profile -a arch."],errorcode=>[1]});
return;
}
$destdir="$installroot/netboot/$osver/$arch/$profile";
$rootimg_dir="$destdir/rootimg";
my $oldpath=cwd();
# now we have all the info we need:
# - rootimg_dir
# - osver
# - arch
# - profile
$callback->({info=>["going to modify $rootimg_dir"]});
#get the root password for the node
my $passtab = xCAT::Table->new('passwd');
if ($passtab) {
(my $pent) = $passtab->getAttribs({key=>'system',username=>'root'},'password');
if ($pent and defined ($pent->{password})) {
my $pass = $pent->{password};
my $shadow;
open($shadow,"<","$rootimg_dir/etc/shadow");
my @shadents = <$shadow>;
close($shadow);
open($shadow,">","$rootimg_dir/etc/shadow");
unless ($pass =~ /^\$1\$/) {
$pass = crypt($pass,'$1$'.genpassword(8));
}
print $shadow "root:$pass:13880:0:99999:7:::\n";
foreach (@shadents) {
unless (/^root:/) {
print $shadow "$_";
}
}
close($shadow);
}
}
# sync fils configured in the synclist to the rootimage
#if (!$imagename) {
# $syncfile = xCAT::SvrUtils->getsynclistfile(undef, $osver, $arch, $profile, "netboot");
# if (defined ($syncfile) && -f $syncfile
# && -d $rootimg_dir) {
# print "sync files from $syncfile to the $rootimg_dir\n";
# `$::XCATROOT/bin/xdcp -i $rootimg_dir -F $syncfile`;
# }
#}
#store the image in the DB
if (!$imagename) {
my @ret=xCAT::SvrUtils->update_tables_with_diskless_image($osver, $arch, $profile, 'statelite');
if ($ret[0] != 0) {
$callback->({error=>["Error when updating the osimage tables: " . $ret[1]]});
}
$imagename="$osver-$arch-statelite-$profile"
}
# now get the files for the node
my @synclist = xCAT::Utils->runcmd("ilitefile $imagename", 0, 1);
if(!@synclist){
$callback->({error=>["There are no files to sync for $imagename. You have to have some files read/write filled out in the synclist table."],errorcode=>[1]});
return;
}
# all I care about are the files, not the characteristics at this point:
my @files;
foreach my $line (@synclist){
foreach (@{$line}){
my $f = (split(/\s+/, $_))[2];
if($f =~ /^\//){
push @files, $f;
}else{
# make sure each file begins with "/"
$callback->({error=>["$f in litefile does not begin with absolute path! Need a '/' in the beginning"],errorcode=>[1]});
return;
}
}
}
liteMe($rootimg_dir,\@files, $callback);
}
sub liteMe {
# Arg 1: root image dir: /install/netboot/centos5.3/x86_64/compute/rootimg
my $rootimg_dir = shift;
my $files = shift;
# Arg 2: callback ref to make comments...
my $callback = shift;
unless(-d $rootimg_dir){
$callback->({error=>["no rootimage dir"],errorcode=>[1]});
return;
}
# snapshot directory for tmpfs and persistent data.
$callback->({info=>["creating $rootimg_dir/$statedir"]});
mkpath("$rootimg_dir/$statedir/tmpfs");
# now make a place for all the files.
# this loop creates symbolic links for each of the files in the sync list.
# 1. copy original contents if they exist to .default directory
# 2. remove file
# 3. create symbolic link to .statelite
my $sym = "1"; # sym = 0 means no symlinks, just bindmount
if($sym){
foreach my $f (@$files){
# copy the file to /.defaults
my $rif = $rootimg_dir . $f;
my $d = dirname($f);
if( -f "$rif" or -d "$rif"){
# if its already a link then leave it alone.
unless(-l $rif){
# mk the directory if it doesn't exist:
$verbose && $callback->({info=>["mkdir -p $rootimg_dir/.default$d"]});
system("mkdir -p $rootimg_dir/.default$d");
# copy the file in place.
$verbose && $callback->({info=>["cp -a $rif $rootimg_dir/.default$d"]});
system("cp -a $rif $rootimg_dir/.default$d");
# remove the real file
$verbose && $callback->({info=>["rm -rf $rif"]});
system("rm -rf $rif");
}
}else{
# in this case the file doesn't exist in the image so we create something to it.
# here we're modifying the read/only image
unless(-d "$rootimg_dir$d"){
$verbose && $callback->({info=>["mkdir -p $rootimg_dir$d"]});
system("mkdir -p $rootimg_dir$d");
}
unless(-d "$rootimg_dir/.default$d"){
$verbose && $callback->({info=>["mkdir -p $rootimg_dir/.default$d"]});
system("mkdir -p $rootimg_dir/.default$d");
}
# now make touch the file:
if($f =~ /\/$/){
# if its a directory, make the directory in .default
$verbose && $callback->({info=>["mkdir -p $rootimg_dir/.default$f"]});
system("mkdir -p $rootimg_dir/.default$f");
}else{
# if its just a file then link it.
$verbose && $callback->({info=>["touch $rootimg_dir/.default$f"]});
system("touch $rootimg_dir/.default$f");
}
}
# now create the spot in tmpfs
$verbose && $callback->({info=>["mkdir -p $rootimg_dir/$statedir/tmpfs$d"]});
system("mkdir -p $rootimg_dir/$statedir/tmpfs$d");
# now for each file, create a symbollic link to /.statelite/tmpfs/
# strip the last / if its a directory for linking, but be careful!
# doing ln -sf ../../tmp <blah>../tmp when tmp is a directory creates 50 levels of links.
# have to do:
# ln -sf ../../tmp <blah>../../tmp/ <- note the / on the end!
if($f =~ /\/$/){
$f =~ s/\/$//g;
}
# now do the links.
# link the .default file to the .statelite file and the real file to the .statelite file.
# ../ for tmpfs
# ../ for .statelite
# the rest are for the paths in the file.
my $l = getRelDir($f);
$verbose && $callback->({info=>["ln -sf ../../$l/.default$f $rootimg_dir/$statedir/tmpfs$f"]});
system("ln -sfn ../../$l/.default$f $rootimg_dir/$statedir/tmpfs/$f");
$verbose && $callback->({info=>["ln -sf $l/$statedir/tmpfs$f $rootimg_dir$f"]});
system("ln -sfn $l/$statedir/tmpfs$f $rootimg_dir$f");
}
}else{
# if we go the bindmount method, create some files
foreach my $f (@$files){
my $rif = $rootimg_dir . $f;
my $d = dirname($rif);
unless(-e "$rif"){
# if it doesn't exist, create it on base image:
unless(-d $d){
#$callback->({info=>["mkdir -p $d"]});
system("mkdir -p $d");
}
if($rif =~ /\/$/){
#$callback->({info=>["mkdir -p $rif"]});
system("mkdir -p $rif");
}else{
#$callback->({info=>["touch $rif"]});
system("touch $rif");
}
}
else {
#$callback->({info=>["$rif exists"]});
}
}
}
# end loop, synclist should now all be in place.
# now stick the rc files in:
# this is actually a pre-rc file because it gets run before the node boots up all the way.
system("cp -a $::XCATROOT/share/xcat/netboot/add-on/statelite/rc.statelite $rootimg_dir/etc/init.d/statelite");
}
sub getRelDir {
my $f = shift;
$f = dirname($f);
if($f eq "/"){
return ".";
}
my $l = "";
my @arr = split("/", $f);
foreach (1 .. $#arr){
$l .= "../";
}
chop($l); # get rid of last /
return $l
}
1;