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