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 $lufsd_base='lufsd';
  50 do { eval '$lufsd_base=~'.$_.';' if !/^@/; } for ('@program_transform_name@');
  51 my $lufsd_bin;
  52 if ($0 eq $lufsd_base || $0=~m#/\Q$lufsd_base\E$#) {
  53         $quiet=1;
  54         $lufsd_bin='@bindir@/'.$lufsd_base.'-bin';
  55         $lufsd_bin=~s#\$\Q{exec_prefix}\E#'@exec_prefix@';#ge;
  56         $lufsd_bin=~s#\$\Q{prefix}\E#'@prefix@';#ge;
  57         }
  58 else {
  59         die if !GetOptions(
  60                         "q|quiet",\$quiet,
  61                           "kernel",\$kernel,    # it must contain "include" subdir
  62                           "modbindir=s",\$modbindir,
  63                           "basedir=s",\$basedir,
  64                           "prebuild",\&prebuild,
  65                           "kernel-gcc-args=s",\$kernel_gcc_args,
  66                         );
  67         }
  68
  69
  70 sub _readfile
  71 {
  72 my($filename,$optional)=@_;
  73
  74         local $/=undef();
  75         local *F;
  76         open F,$filename or do { cluck "Open \"$filename\": $!" if !$optional; return ""; };
  77         my $r=<F>;
  78         close F or cluck "Close \"$filename\": $!";
  79         return $r;
  80 }
  81
  82 sub _writefile
  83 {
  84 my($filename,@content)=@_;
  85
  86         local *F;
  87         open F,($filename=~/^[|]/ ? "" : ">").$filename or confess "rewrite \"$filename\": $!";
  88         print F @content;
  89         close F or confess "close \"$filename\": $!";   # Do not &cluck as it may be pipe result
  90 }
  91
  92 sub _system
  93 {
  94 my(@args)=@_;
  95
  96         print STDERR "+ ".join(" ",@args)."\n" if !$quiet;
  97         return system @args;
  98 }
  99
 100 sub _pass
 101 {
 102 my($load)=@_;
 103
 104         my $modproberc;
 105         if ($load) {
 106                 do { ($modproberc=_system $_) and cluck "$_ failed - ignoring"; }
 107                                 for ("/sbin/depmod -aq","/sbin/modprobe lufs");
 108                 }
 109         exit ($modproberc ? 1 : 0) if !$lufsd_bin;
 110         do { exec $lufsd_bin,@ARGV; };
 111         confess "Failed to exec '$lufsd_bin': $!";
 112 }
 113
 114
 115 my $filesystems=_readfile "/proc/filesystems";  # 'lufs' may be built-in
 116 _pass if $filesystems=~/\blufs$/m;
 117 my $modules=_readfile "/proc/modules";  # 'lufs' may be already loaded
 118 _pass if $modules=~/^lufs\b/m;
 119 _pass if !_system "/sbin/modprobe lufs 2>/dev/null";
 120
 121 print STDERR "Preparing LUFS kernel module - this may take several minutes...\n";       # if !$quiet;
 122
 123 my $proc_version=_readfile "/proc/version";
 124 my $uname_r=($proc_version=~/^Linux version (\S+)/)[0] || _readfile "uname -r|";
 125 chomp $uname_r;
 126 confess "Failed to detect kernel version" if !$uname_r;
 127 my $uname_smp=($uname_r=~s/smp$// && "smp");
 128 my $uname_r_base=($uname_r=~/^([^-]+)/)[0];
 129 print STDERR "Running kernel version: $uname_r (base version $uname_r_base)\n" if !$quiet;
 130
 131 my $lufs_o="lufs.".modext($uname_r);
 132
 133 my $moduledir="/lib/modules/$uname_r$uname_smp/kernel/fs/lufs";
 134 print STDERR "Destination module directory: $moduledir\n" if !$quiet;
 135
 136 my @kernel_paths=(
 137                                 "/lib/modules/$uname_r/build",
 138                                 "/usr/src/kernel-headers-$uname_r",
 139                                 "/usr/src/linux-$uname_r",
 140                                 "/usr/src/linux-$uname_r_base",
 141                                 "/usr/src/linux",
 142                                 "/usr/src/kernel-source-$uname_r",      # no .config?
 143                                 );
 144 do { $kernel||=$_ if -d $_; } for (@kernel_paths);
 145 if (!$kernel) {
 146         print STDERR "Failed to find kernel headers for $uname_r\n" if !$kernel && !$quiet;
 147         }
 148 else {
 149         # We need /usr/include/lufs/* for standard package compilation.
 150         # There is no sense to make separate 'devel' package.
 151         for ("$vardir/$lufs_o") {
 152                 next if !$vardir;
 153                 # Create the 'lufs.o' in our /var/lib directory and only link it
 154                 # to prevent using obsolete modules after upgrading 'lufs' package.
 155                 # depmod(1) will take the larget symlink name - we must create directory for  it.
 156                 if (build($kernel,$uname_r,$_)) {
 157                         do { cluck "Failed to symlink $_"; next; }
 158                                         if _system "/bin/rm -rf $moduledir; /bin/mkdir -p $moduledir; /bin/ln -s $_ $moduledir/$lufs_o";
 159                         _pass 1;
 160                         }
 161                 }
 162         }
 163
 164 local $_;
 165 for (<$modbindir/*-$uname_r*/$lufs_o>,<$modbindir/*-${uname_r_base}*/$lufs_o>,<$modbindir/*/$lufs_o>) {
 166         # Do not: /sbin/insmod -o lufs -p $_ 2>/dev/null
 167         # as 2.6 insmod has no options at all.
 168         next if _system "/sbin/rmmod lufs 2>/dev/null; /sbin/insmod $_ 2>/dev/null";
 169         do { cluck "Failed to symlink $_"; next; }
 170                         if _system "/bin/rm -rf $moduledir; /bin/mkdir -p $moduledir; /bin/ln -s $_ $moduledir/$lufs_o";
 171         # 0 as already insmod(8)ed.
 172         _pass 0;
 173         }
 174 confess "lufs module not loaded: Try running $basedir/prepmod to see more." if $quiet;
 175 confess "Failed to prepare $lufs_o module for your Linux kernel $uname_r.\n"
 176                 .($kernel ? "Detected Linux kernel sources \"$kernel\" do not appear to be valid.\n"
 177                                 : "No Linux kernel sources for your running kernel were found.\n")
 178                 ."Please install kernel-source-x.y.z.i386.rpm or kernel-headers_x.y.z_i386.deb.\n"
 179                 ."The following directory paths were search (first existing directory used):\n"
 180                 .join("",map("\t\t$_\n",@kernel_paths));
 181
 182
 183 sub build_gcc
 184 {
 185 my($kernel,$uname_r,$destmodule)=@_;
 186
 187         print STDERR "Using kernel sources: $kernel\n" if !$quiet;
 188         confess "Kernel sources $kernel do not contain 'include' subdirectory" if ! -d $kernel."/include";
 189
 190         my $kdebug="";
 191         do { $kdebug=$_ if !/^@/; } for ('@KDEBUG_FLAGS@');
 192         my $cmdline="/usr/bin/gcc"
 193                         .($quiet ? " 2>/dev/null" : "")
 194                         ." -Wall -Wstrict-prototypes -Wno-trigraphs"
 195                         ." -O2 -fno-strict-aliasing -fno-common -fomit-frame-pointer -pipe -mpreferred-stack-boundary=2"
 196                         #." -march=i586"
 197                         ." -D__KERNEL__ -DMODULE -DLINUX -DKBUILD_MODNAME=lufs"
 198                         ." ".$kdebug
 199                         ." ".$kernel_gcc_args
 200                         ." -I$kernel/include"
 201                         ." -I$kernel/include/asm-i386/mach-default";    # gcc should not care if this 2.6 dir does not exist
 202
 203         my $config=_readfile "$kernel/.config","optional";
 204         my $autoconf=_readfile "$kernel/include/linux/autoconf.h","optional";
 205         if (0
 206                         || $config=~/^CONFIG_MODVERSIONS=y\b/m
 207                         || $autoconf=~/^#define CONFIG_MODVERSIONS\b/m
 208                         || (!$config && !$autoconf)) {  # assume modversions if not known
 209                 $cmdline.=" -DMODVERSIONS";
 210                 $cmdline.=" -include $kernel/include/linux/version.h"
 211                                 if -f "$kernel/include/linux/version.h";
 212                 $cmdline.=" -include $kernel/include/linux/modversions.h";
 213                 }
 214
 215         my @objects=map({ my $o=$_; $o=~s/[.]c$/.o/; $o; } @sources);
 216         return !_system "set -e; /bin/mkdir -p `dirname $destmodule`; /bin/rm -f $destmodule;"
 217                         .(!$vardir ? "" : " cd $vardir;")
 218                         ." $cmdline -c ".join(" ",map({ srcdir($uname_r)."/".$_; } @sources)).";"
 219                         ." /usr/bin/ld -r -o $destmodule ".join(" ",@objects).";"
 220                         ." /bin/rm -f ".join(" ",@objects);
 221 }
 222
 223
 224 sub build_make
 225 {
 226 my($kernel,$uname_r,$destmodule,%args)=@_;
 227
 228         print STDERR "Using kernel sources: $kernel\n" if !$quiet;
 229         # 'Rules.make' not present in 2.6+ kernels
 230         do { confess "Kernel sources $kernel do not contain '$_' file" if ! -f $_; } for ($kernel."/arch/i386/Makefile");
 231
 232         my $kdebug="";
 233         do { $kdebug=$_ if !/^@/; } for ('@KDEBUG_FLAGS@');
 234         my $predir=srcdir $uname_r;
 235         $predir=$ENV{"PWD"}."/$predir" if $predir!~m#^/#;
 236         # Workaround a bug in at least Red Hat 2.4.18-18.8.0
 237         if (-f "$kernel/include/linux/version.h") {
 238                 for ("$kernel/include/linux/modversions.h") {
 239                         _system "cp -p $_ $_-orig" if ! -f "$_-orig";
 240                         _writefile $_,"#include <linux/version.h>\t/* lufs */\n"._readfile $_;
 241                         }
 242                 }
 243         my $cmdline="make -C $kernel"
 244                         ." SUBDIRS=\"$predir\" modules"
 245                         ." EXTRA_CFLAGS=\"$kernel_gcc_args\""
 246                         .($quiet ? ' &>/dev/null' : '');
 247         my @objects=map({ my $o=$_; $o=~s/[.]c$/.o/; $o; } @sources,"lufs.mod.c","lufs.c");
 248         $cmdline="set -e; /bin/mkdir -p `dirname $destmodule`; /bin/rm -f $destmodule;"
 249                         ." $cmdline;"
 250                         ." /bin/mv -f $predir/lufs.".modext($uname_r)." $destmodule;"
 251                         ." /bin/rm -f ".join(" ",map(("$predir/$_","$predir/.$_.flags","$predir/.$_.cmd"),@objects),"$predir/lufs.mod.c","$predir/.lufs.ko.cmd").";";
 252         my $r=!_system $cmdline;
 253         return $r if $r;
 254         # Rebuild existing '$kernel/tmp_include_depends' or '$kernel/.depend'
 255         # as it may contain non-existing pathnames:
 256         _system "make -C $kernel dep"
 257                                 .($quiet ? ' &>/dev/null' : '');
 258         return !_system $cmdline;
 259 }
 260
 261
 262 sub build
 263 {
 264 my($kernel,$uname_r,$destmodule,%args)=@_;
 265
 266         # Debian uname(1) does not support '-p'.
 267         my $arch=_readfile "uname -p 2>/dev/null || true|"
 268                         || _readfile "uname -m|";
 269         chomp $arch;
 270         my $single_config=-f "$kernel/.config";
 271         if (!$single_config) {
 272                 my $spec_config="$kernel/configs/kernel-$uname_r_base-$arch".($uname_smp ? "-smp" : "").".config";
 273                 _system "ln -s $spec_config $kernel/.config"
 274                                 if -f $spec_config;
 275                 }
 276         my $r;
 277         # 'Rules.make' not present in 2.6+ kernels
 278         if (-f $kernel."/arch/i386/Makefile" && -f "$kernel/.config")
 279                 { $r=build_make $kernel,$uname_r,$destmodule,%args; }
 280         else
 281                 { $r=build_gcc $kernel,$uname_r,$destmodule,%args; }
 282         _system "rm -f $kernel/.config"
 283                         if !$single_config;
 284         return $r;
 285 }
 286
 287
 288 sub prebuild_kernel
 289 {
 290 my($dir,$vendor,$uname_r,%args)=@_;
 291
 292         confess "Unrecognized vendor for dir: $dir" if !$vendor;
 293         confess "Unrecognized uname_r for dir: $dir" if !$uname_r;
 294         confess "Failed to build $dir" if !build $dir,$uname_r,$modbindir."/lufs-$vendor-$uname_r.".modext($uname_r),%args;
 295 }
 296
 297
 298 sub prebuild_rpm
 299 {
 300 my($rpm)=@_;
 301
 302         my $vendor=_readfile "rpm 2>/dev/null --qf '%{VENDOR}' -qp '$rpm' |";
 303         $vendor=~s/,.*//;
 304         $vendor=~tr/ //d;
 305         my $uname_r;
 306         $uname_r||=($rpm=~m#/kernel-source-([^-]+-[^-]+)[.][^.]+[.]rpm$#)[0];
 307         my $uname_r_base=($uname_r=~/^([^-]+)/)[0];
 308         my $dir;
 309         do { $dir||=$_ if -d $_; } for ("/usr/src/linux-$uname_r");
 310         do { $dir||=$_ if -d $_; } for ("/usr/src/linux-$uname_r_base");        # older RedHat kernels
 311         confess "Kernel sources already found in $dir" if $dir;
 312         # '--nodeps' to prevent: error: Failed dependencies: perl-base is needed by *mdk
 313         _system "rpm -i --nodeps '$rpm'" and confess "RPM installation of $rpm";
 314         do { $dir||=$_ if -d $_; } for ("/usr/src/linux-$uname_r");
 315         do { $dir||=$_ if -d $_; } for ("/usr/src/linux-$uname_r_base");        # older RedHat kernels
 316         $dir or confess "Kernel source tree not found in: $rpm";
 317         _system "cp -p $dir/include/linux/rhconfig.h $dir/include/linux/rhconfig.h-orig"
 318                                 if -f "$dir/include/linux/rhconfig.h";
 319         for my $smp ("","smp") {
 320                 my @archs=qw(i386 i586 i686 athlon);
 321                 for my $arch (@archs) {
 322                         my %boot=(
 323                                         "__BOOT_KERNEL_SMP"=>$smp,
 324                                         map({ ("__MODULE_KERNEL_$_"=>($arch eq $_)); } @archs),
 325                                         "__BOOT_KERNEL_BOOT"=>0,
 326                                         "__BOOT_KERNEL_BOOTSMP"=>0,
 327                                         "__BOOT_KERNEL_ENTERPRISE"=>0,
 328                                         "__BOOT_KERNEL_BIGMEM"=>0,
 329                                         "__BOOT_KERNEL_DEBUG"=>0,
 330                                         );
 331                         if (-f "$dir/include/linux/rhconfig.h") {
 332                                 my $defines="";
 333                                 for (keys(%boot)) {
 334                                         $defines.="+#define $_ ".($boot{$_} ? 1 : 0)."\n";
 335                                         }
 336                                 _system "cp -p -f $dir/include/linux/rhconfig.h-orig $dir/include/linux/rhconfig.h";
 337                                 _writefile "| patch $dir/include/linux/rhconfig.h",<<"RHCONFIG_H_NOBOOT_EOF";
 338 --- ./include/linux/rhconfig.h-orig     Thu Aug 21 14:50:16 2003
 339 +++ ./include/linux/rhconfig.h  Thu Aug 21 14:59:22 2003
 340 \@\@ -10,7 +10,@{[ 7+keys(%boot) ]} \@\@
 341   * /boot/kernel.h - initscripts should create it for us
 342   */
 343
 344 -#include "/boot/kernel.h"
 345 +/* lufs: #include "/boot/kernel.h" */
 346 $defines
 347  #if defined(__BOOT_KERNEL_SMP) && (__BOOT_KERNEL_SMP == 1)
 348  #define __module__smp
 349 RHCONFIG_H_NOBOOT_EOF
 350                                 }
 351                         # Mandrake packages have no configs/ and they have just that '.config' file.
 352                         my $single_config=-f "$dir/.config";
 353                         if (!$single_config) {
 354                                 my $spec_config="$dir/configs/kernel-$uname_r_base-$arch".($smp ? "-smp" : "").".config";
 355                                 next if ! -f $spec_config;
 356                                 _system "ln -s $spec_config $dir/.config";
 357                                 }
 358                         prebuild_kernel $dir,$vendor,$uname_r.$smp.".".$arch;
 359                         _system "rm -f $dir/.config"
 360                                         if !$single_config;
 361                         }
 362                 }
 363         _system "rpm -e kernel-source-$uname_r" and confess "Remove of kernel-source-$uname_r";
 364         _system "rm -rf $dir";
 365 }
 366
 367 sub prebuild_dir
 368 {
 369 my($dir)=@_;
 370
 371         my $vendor;
 372         chomp (my $debian=_readfile "/etc/debian_version","optional");
 373         $debian=~tr#/#_#;
 374         $vendor="Debian".$debian if $debian && $dir=~m#^/usr/src/#;
 375         my $uname_r;
 376         $uname_r||=($dir=~m#/kernel-headers-([^/]+)/*$#)[0];
 377         $uname_r||=($dir=~m#/linux-([^/]+)/*$#)[0];
 378         $uname_r||=($dir=~m#^/lib/modules/([^/]+)/build/*$#)[0];
 379         prebuild_kernel $dir,$vendor,$uname_r;
 380 }
 381
 382 sub prebuild
 383 {
 384         $vardir=undef();        # we may not yet have /var/lib/lufs
 385         for (@ARGV) {
 386                 do { prebuild_rpm $_; next; } if /[.]rpm$/;
 387                 do { prebuild_dir $_; next; } if -d $_;
 388                 confess "Unrecognized kernel: $_";
 389                 }
 390         exit 0;
 391 }