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