kernel/Linux/prepmod.in

   1 #! /usr/bin/perl -w
   2 #
   3 # $Id$
   4 # Check and possibly rebuild lufs kernel module for the current kernel.
   5 # Copyright (C) 2003 Jan Kratochvil <project-captive@jankratochvil.net>
   6 #
   7 # This program is free software; you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation; exactly version 2 of June 1991 is required
  10 #
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program; if not, write to the Free Software
  18 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19
  20
  21 use strict;
  22 use Carp qw(cluck confess);
  23 use Getopt::Long;
  24 # Do not use any non-core Perl modules here.
  25 # Be perl-5.0 compatible (is it needed if we require Linux kernel >= 2.4 ?)
  26
  27
  28 my $basedir='@datadir@/lufs';
  29 my $vardir='@localstatedir@/lib/lufs';
  30 $basedir=~s#\$\Q{prefix}\E#'@prefix@';#ge;
  31 $vardir=~s#\$\Q{prefix}\E#'@prefix@';#ge;
  32 $vardir="" if $vardir=~/^@/;
  33 sub srcdir { my($uname_r)=@_; $basedir."/".($uname_r lt "2.5" ? "2.4" : "2.6"); }
  34 my $modbindir=$basedir."/modbin";
  35 my @sources=qw(proc.c inode.c dir.c file.c symlink.c);
  36
  37 my $quiet;
  38 my $kernel;
  39 my $prebuild;
  40 use vars qw($kernel_gcc_args);
  41 $kernel_gcc_args="";
  42
  43 sub modext { my($uname_r)=@_; ($uname_r lt "2.5" ? "o" : "ko"); }
  44
  45 # mount(8) will util-linux/lib/env.c/sanitize_env()
  46 # including the clearance our $PATH:
  47 $ENV{"PATH"}=join(":",qw(/usr/local/bin /usr/bin /bin),($ENV{"PATH"} || ()));
  48
  49 my $lufsd_bin;
  50 if ($0 eq "lufsd" || $0=~m#/lufsd$#) {
  51         $quiet=1;
  52         $lufsd_bin='@bindir@/lufsd-bin';
  53         $lufsd_bin=~s#\$\Q{exec_prefix}\E#'@exec_prefix@';#ge;
  54         $lufsd_bin=~s#\$\Q{prefix}\E#'@prefix@';#ge;
  55         }
  56 else {
  57         die if !GetOptions(
  58                         "q|quiet",\$quiet,
  59                           "kernel",\$kernel,    # it must contain "include" subdir
  60                           "modbindir=s",\$modbindir,
  61                           "basedir=s",\$basedir,
  62                           "prebuild",\&prebuild,
  63                           "kernel-gcc-args=s",\$kernel_gcc_args,
  64                         );
  65         }
  66
  67
  68 sub _readfile
  69 {
  70 my($filename,$optional)=@_;
  71
  72         local $/=undef();
  73         local *F;
  74         open F,$filename or do { cluck "Open \"$filename\": $!" if !$optional; return ""; };
  75         my $r=<F>;
  76         close F or cluck "Close \"$filename\": $!";
  77         return $r;
  78 }
  79
  80 sub _writefile
  81 {
  82 my($filename,@content)=@_;
  83
  84         local *F;
  85         open F,($filename=~/^[|]/ ? "" : ">").$filename or confess "rewrite \"$filename\": $!";
  86         print F @content;
  87         close F or confess "close \"$filename\": $!";   # Do not &cluck as it may be pipe result
  88 }
  89
  90 sub _system
  91 {
  92 my(@args)=@_;
  93
  94         print STDERR "+ ".join(" ",@args)."\n" if !$quiet;
  95         return system @args;
  96 }
  97
  98 sub _pass
  99 {
 100 my($load)=@_;
 101
 102         my $modproberc;
 103         if ($load) {
 104                 do { ($modproberc=_system $_) and cluck "$_ failed - ignoring"; }
 105                                 for ("/sbin/depmod -aq","/sbin/modprobe lufs");
 106                 }
 107         exit ($modproberc ? 1 : 0) if !$lufsd_bin;
 108         do { exec $lufsd_bin,@ARGV; };
 109         confess "Failed to exec '$lufsd_bin': $!";
 110 }
 111
 112
 113 my $filesystems=_readfile "/proc/filesystems";  # 'lufs' may be built-in
 114 _pass if $filesystems=~/\blufs$/m;
 115 my $modules=_readfile "/proc/modules";  # 'lufs' may be already loaded
 116 _pass if $modules=~/^lufs\b/m;
 117 _pass if !_system "/sbin/modprobe lufs 2>/dev/null";
 118
 119 print STDERR "Preparing LUFS kernel module - this may take several minutes...\n";       # if !$quiet;
 120
 121 my $proc_version=_readfile "/proc/version";
 122 my $uname_r=($proc_version=~/^Linux version (\S+)/)[0] || _readfile "uname -r|";
 123 chomp $uname_r;
 124 confess "Failed to detect kernel version" if !$uname_r;
 125 my $uname_smp=($uname_r=~s/smp$// && "smp");
 126 my $uname_r_base=($uname_r=~/^([^-]+)/)[0];
 127 print STDERR "Running kernel version: $uname_r (base version $uname_r_base)\n" if !$quiet;
 128
 129 my $lufs_o="lufs.".modext($uname_r);
 130
 131 my $moduledir="/lib/modules/$uname_r$uname_smp/kernel/fs/lufs";
 132 print STDERR "Destination module directory: $moduledir\n" if !$quiet;
 133
 134 my @kernel_paths=(
 135                                 "/lib/modules/$uname_r/build",
 136                                 "/usr/src/kernel-headers-$uname_r",
 137                                 "/usr/src/linux-$uname_r",
 138                                 "/usr/src/linux-$uname_r_base",
 139                                 "/usr/src/linux",
 140                                 "/usr/src/kernel-source-$uname_r",      # no .config?
 141                                 );
 142 do { $kernel||=$_ if -d $_; } for (@kernel_paths);
 143 if (!$kernel) {
 144         print STDERR "Failed to find kernel headers for $uname_r\n" if !$kernel && !$quiet;
 145         }
 146 else {
 147         # We need /usr/include/lufs/* for standard package compilation.
 148         # There is no sense to make separate 'devel' package.
 149         for ("$vardir/$lufs_o") {
 150                 next if !$vardir;
 151                 # Create the 'lufs.o' in our /var/lib directory and only link it
 152                 # to prevent using obsolete modules after upgrading 'lufs' package.
 153                 # depmod(1) will take the larget symlink name - we must create directory for  it.
 154                 if (build($kernel,$uname_r,$_)) {
 155                         do { cluck "Failed to symlink $_"; next; }
 156                                         if _system "/bin/rm -rf $moduledir; /bin/mkdir -p $moduledir; /bin/ln -s $_ $moduledir/$lufs_o";
 157                         _pass 1;
 158                         }
 159                 }
 160         }
 161
 162 local $_;
 163 for (<$modbindir/*-$uname_r*/$lufs_o>,<$modbindir/*-${uname_r_base}*/$lufs_o>,<$modbindir/*/$lufs_o>) {
 164         # Do not: /sbin/insmod -o lufs -p $_ 2>/dev/null
 165         # as 2.6 insmod has no options at all.
 166         next if _system "/sbin/rmmod lufs 2>/dev/null; /sbin/insmod $_ 2>/dev/null";
 167         do { cluck "Failed to symlink $_"; next; }
 168                         if _system "/bin/rm -rf $moduledir; /bin/mkdir -p $moduledir; /bin/ln -s $_ $moduledir/$lufs_o";
 169         # 0 as already insmod(8)ed.
 170         _pass 0;
 171         }
 172 confess "lufs module not loaded: Try running $basedir/prepmod to see more." if $quiet;
 173 confess "Failed to prepare $lufs_o module for your Linux kernel $uname_r.\n"
 174                 .($kernel ? "Detected Linux kernel sources \"$kernel\" do not appear to be valid.\n"
 175                                 : "No Linux kernel sources for your running kernel were found.\n")
 176                 ."Please install kernel-source-x.y.z.i386.rpm or kernel-headers_x.y.z_i386.deb.\n"
 177                 ."The following directory paths were search (first existing directory used):\n"
 178                 .join("",map("\t\t$_\n",@kernel_paths));
 179
 180
 181 sub build_gcc
 182 {
 183 my($kernel,$uname_r,$destmodule)=@_;
 184
 185         print STDERR "Using kernel sources: $kernel\n" if !$quiet;
 186         confess "Kernel sources $kernel do not contain 'include' subdirectory" if ! -d $kernel."/include";
 187
 188         my $kdebug="";
 189         do { $kdebug=$_ if !/^@/; } for ('@KDEBUG_FLAGS@');
 190         my $cmdline="/usr/bin/gcc"
 191                         .($quiet ? " 2>/dev/null" : "")
 192                         ." -Wall -Wstrict-prototypes -Wno-trigraphs"
 193                         ." -O2 -fno-strict-aliasing -fno-common -fomit-frame-pointer -pipe -mpreferred-stack-boundary=2"
 194                         #." -march=i586"
 195                         ." -D__KERNEL__ -DMODULE -DLINUX -DKBUILD_MODNAME=lufs"
 196                         ." ".$kdebug
 197                         ." ".$kernel_gcc_args
 198                         ." -I$kernel/include"
 199                         ." -I$kernel/include/asm-i386/mach-default";    # gcc should not care if this 2.6 dir does not exist
 200
 201         my $config=_readfile "$kernel/.config","optional";
 202         my $autoconf=_readfile "$kernel/include/linux/autoconf.h","optional";
 203         if (0
 204                         || $config=~/^CONFIG_MODVERSIONS=y\b/m
 205                         || $autoconf=~/^#define CONFIG_MODVERSIONS\b/m
 206                         || (!$config && !$autoconf)) {  # assume modversions if not known
 207                 $cmdline.=" -DMODVERSIONS";
 208                 $cmdline.=" -include $kernel/include/linux/version.h"
 209                                 if -f "$kernel/include/linux/version.h";
 210                 $cmdline.=" -include $kernel/include/linux/modversions.h";
 211                 }
 212
 213         my @objects=map({ my $o=$_; $o=~s/[.]c$/.o/; $o; } @sources);
 214         return !_system "set -e; /bin/mkdir -p `dirname $destmodule`; /bin/rm -f $destmodule;"
 215                         .(!$vardir ? "" : " cd $vardir;")
 216                         ." $cmdline -c ".join(" ",map({ srcdir($uname_r)."/".$_; } @sources)).";"
 217                         ." /usr/bin/ld -r -o $destmodule ".join(" ",@objects).";"
 218                         ." /bin/rm -f ".join(" ",@objects);
 219 }
 220
 221
 222 sub build_make
 223 {
 224 my($kernel,$uname_r,$destmodule,%args)=@_;
 225
 226         print STDERR "Using kernel sources: $kernel\n" if !$quiet;
 227         # 'Rules.make' not present in 2.6+ kernels
 228         do { confess "Kernel sources $kernel do not contain '$_' file" if ! -f $_; } for ($kernel."/arch/i386/Makefile");
 229
 230         my $kdebug="";
 231         do { $kdebug=$_ if !/^@/; } for ('@KDEBUG_FLAGS@');
 232         my $predir=srcdir $uname_r;
 233         $predir=$ENV{"PWD"}."/$predir" if $predir!~m#^/#;
 234         # Workaround a bug in at least Red Hat 2.4.18-18.8.0
 235         if (-f "$kernel/include/linux/version.h") {
 236                 for ("$kernel/include/linux/modversions.h") {
 237                         _system "cp -p $_ $_-orig" if ! -f "$_-orig";
 238                         _writefile $_,"#include <linux/version.h>\t/* lufs */\n"._readfile $_;
 239                         }
 240                 }
 241         my $cmdline="make -C $kernel"
 242                         ." SUBDIRS=\"$predir\" modules"
 243                         ." EXTRA_CFLAGS=\"$kernel_gcc_args\""
 244                         .($quiet ? ' &>/dev/null' : '');
 245         my @objects=map({ my $o=$_; $o=~s/[.]c$/.o/; $o; } @sources,"lufs.mod.c","lufs.c");
 246         $cmdline="set -e; /bin/mkdir -p `dirname $destmodule`; /bin/rm -f $destmodule;"
 247                         ." $cmdline;"
 248                         ." /bin/mv -f $predir/lufs.".modext($uname_r)." $destmodule;"
 249                         ." /bin/rm -f ".join(" ",map(("$predir/$_","$predir/.$_.flags","$predir/.$_.cmd"),@objects),"$predir/lufs.mod.c","$predir/.lufs.ko.cmd").";";
 250         my $r=!_system $cmdline;
 251         return $r if $r;
 252         # Rebuild existing '$kernel/tmp_include_depends' or '$kernel/.depend'
 253         # as it may contain non-existing pathnames:
 254         _system "make -C $kernel dep"
 255                                 .($quiet ? ' &>/dev/null' : '');
 256         return !_system $cmdline;
 257 }
 258
 259
 260 sub build
 261 {
 262 my($kernel,$uname_r,$destmodule,%args)=@_;
 263
 264         # Debian uname(1) does not support '-p'.
 265         my $arch=_readfile "uname -p 2>/dev/null || true|"
 266                         || _readfile "uname -m|";
 267         chomp $arch;
 268         my $single_config=-f "$kernel/.config";
 269         if (!$single_config) {
 270                 my $spec_config="$kernel/configs/kernel-$uname_r_base-$arch".($uname_smp ? "-smp" : "").".config";
 271                 _system "ln -s $spec_config $kernel/.config"
 272                                 if -f $spec_config;
 273                 }
 274         my $r;
 275         # 'Rules.make' not present in 2.6+ kernels
 276         if (-f $kernel."/arch/i386/Makefile" && -f "$kernel/.config")
 277                 { $r=build_make $kernel,$uname_r,$destmodule,%args; }
 278         else
 279                 { $r=build_gcc $kernel,$uname_r,$destmodule,%args; }
 280         _system "rm -f $kernel/.config"
 281                         if !$single_config;
 282         return $r;
 283 }
 284
 285
 286 sub prebuild_kernel
 287 {
 288 my($dir,$vendor,$uname_r,%args)=@_;
 289
 290         confess "Unrecognized vendor for dir: $dir" if !$vendor;
 291         confess "Unrecognized uname_r for dir: $dir" if !$uname_r;
 292         confess "Failed to build $dir" if !build $dir,$uname_r,$modbindir."/lufs-$vendor-$uname_r.".modext($uname_r),%args;
 293 }
 294
 295
 296 sub prebuild_rpm
 297 {
 298 my($rpm)=@_;
 299
 300         my $vendor=_readfile "rpm 2>/dev/null --qf '%{VENDOR}' -qp '$rpm' |";
 301         $vendor=~s/,.*//;
 302         $vendor=~tr/ //d;
 303         my $uname_r;
 304         $uname_r||=($rpm=~m#/kernel-source-([^-]+-[^-]+)[.][^.]+[.]rpm$#)[0];
 305         my $uname_r_base=($uname_r=~/^([^-]+)/)[0];
 306         my $dir;
 307         do { $dir||=$_ if -d $_; } for ("/usr/src/linux-$uname_r");
 308         do { $dir||=$_ if -d $_; } for ("/usr/src/linux-$uname_r_base");        # older RedHat kernels
 309         confess "Kernel sources already found in $dir" if $dir;
 310         # '--nodeps' to prevent: error: Failed dependencies: perl-base is needed by *mdk
 311         _system "rpm -i --nodeps '$rpm'" and confess "RPM installation of $rpm";
 312         do { $dir||=$_ if -d $_; } for ("/usr/src/linux-$uname_r");
 313         do { $dir||=$_ if -d $_; } for ("/usr/src/linux-$uname_r_base");        # older RedHat kernels
 314         $dir or confess "Kernel source tree not found in: $rpm";
 315         _system "cp -p $dir/include/linux/rhconfig.h $dir/include/linux/rhconfig.h-orig"
 316                                 if -f "$dir/include/linux/rhconfig.h";
 317         for my $smp ("","smp") {
 318                 my @archs=qw(i386 i586 i686 athlon);
 319                 for my $arch (@archs) {
 320                         my %boot=(
 321                                         "__BOOT_KERNEL_SMP"=>$smp,
 322                                         map({ ("__MODULE_KERNEL_$_"=>($arch eq $_)); } @archs),
 323                                         "__BOOT_KERNEL_BOOT"=>0,
 324                                         "__BOOT_KERNEL_BOOTSMP"=>0,
 325                                         "__BOOT_KERNEL_ENTERPRISE"=>0,
 326                                         "__BOOT_KERNEL_BIGMEM"=>0,
 327                                         "__BOOT_KERNEL_DEBUG"=>0,
 328                                         );
 329                         if (-f "$dir/include/linux/rhconfig.h") {
 330                                 my $defines="";
 331                                 for (keys(%boot)) {
 332                                         $defines.="+#define $_ ".($boot{$_} ? 1 : 0)."\n";
 333                                         }
 334                                 _system "cp -p -f $dir/include/linux/rhconfig.h-orig $dir/include/linux/rhconfig.h";
 335                                 _writefile "| patch $dir/include/linux/rhconfig.h",<<"RHCONFIG_H_NOBOOT_EOF";
 336 --- ./include/linux/rhconfig.h-orig     Thu Aug 21 14:50:16 2003
 337 +++ ./include/linux/rhconfig.h  Thu Aug 21 14:59:22 2003
 338 \@\@ -10,7 +10,@{[ 7+keys(%boot) ]} \@\@
 339   * /boot/kernel.h - initscripts should create it for us
 340   */
 341
 342 -#include "/boot/kernel.h"
 343 +/* lufs: #include "/boot/kernel.h" */
 344 $defines
 345  #if defined(__BOOT_KERNEL_SMP) && (__BOOT_KERNEL_SMP == 1)
 346  #define __module__smp
 347 RHCONFIG_H_NOBOOT_EOF
 348                                 }
 349                         # Mandrake packages have no configs/ and they have just that '.config' file.
 350                         my $single_config=-f "$dir/.config";
 351                         if (!$single_config) {
 352                                 my $spec_config="$dir/configs/kernel-$uname_r_base-$arch".($smp ? "-smp" : "").".config";
 353                                 next if ! -f $spec_config;
 354                                 _system "ln -s $spec_config $dir/.config";
 355                                 }
 356                         prebuild_kernel $dir,$vendor,$uname_r.$smp.".".$arch;
 357                         _system "rm -f $dir/.config"
 358                                         if !$single_config;
 359                         }
 360                 }
 361         _system "rpm -e kernel-source-$uname_r" and confess "Remove of kernel-source-$uname_r";
 362         _system "rm -rf $dir";
 363 }
 364
 365 sub prebuild_dir
 366 {
 367 my($dir)=@_;
 368
 369         my $vendor;
 370         chomp (my $debian=_readfile "/etc/debian_version","optional");
 371         $debian=~tr#/#_#;
 372         $vendor="Debian".$debian if $debian && $dir=~m#^/usr/src/#;
 373         my $uname_r;
 374         $uname_r||=($dir=~m#/kernel-headers-([^/]+)/*$#)[0];
 375         $uname_r||=($dir=~m#/linux-([^/]+)/*$#)[0];
 376         $uname_r||=($dir=~m#^/lib/modules/([^/]+)/build/*$#)[0];
 377         prebuild_kernel $dir,$vendor,$uname_r;
 378 }
 379
 380 sub prebuild
 381 {
 382         $vardir=undef();        # we may not yet have /var/lib/lufs
 383         for (@ARGV) {
 384                 do { prebuild_rpm $_; next; } if /[.]rpm$/;
 385                 do { prebuild_dir $_; next; } if -d $_;
 386                 confess "Unrecognized kernel: $_";
 387                 }
 388         exit 0;
 389 }