dracut

   1 #!/bin/bash
   2 #
   3 # Generator script for a dracut initramfs
   4 # Tries to retain some degree of compatibility with the command line
   5 # of the various mkinitrd implementations out there
   6 #
   7 # Copyright 2008, Red Hat, Inc.  Jeremy Katz <katzj@redhat.com>
   8 # GPLv2 header here
   9
  10 [ -f /etc/dracut.conf ] && . /etc/dracut.conf
  11
  12 while [ $# -gt 0 ]; do
  13     case $1 in
  14         -f|--force)
  15             force=yes
  16             shift
  17             ;;
  18         -h|--help)
  19             echo "Usage: $0 [-f] <initramfs> <kernel-version>"
  20             exit 1
  21             ;;
  22         -v|--verbose)
  23             set -x
  24             shift
  25             ;;
  26         -l|--local)
  27             allowlocal="yes"
  28             shift
  29             ;;
  30         --allow-missing)
  31             shift
  32             ;;
  33         *)
  34             break
  35     esac
  36 done
  37
  38 if [ -n "$2" ]; then
  39     kernel=$2
  40 else
  41     kernel=$(uname -r)
  42 fi
  43 if [ -n "$1" ]; then
  44     outfile=$(readlink -f $1)
  45 else
  46     outfile="/boot/initrd-$kernel.img"
  47 fi
  48
  49 if [ -f "$outfile" -a  -z "$force" ]; then
  50     echo "Will not override existing initramfs ($outfile) without --force"
  51     exit 1
  52 fi
  53
  54 if [ -n "$allowlocal" -a -f ./init ]; then
  55     source ./dracut-functions
  56     initfile=./init
  57     switchroot=./switch_root
  58     rulesdir=./rules.d
  59 else
  60     source /usr/libexec/dracut/functions
  61     initfile=/usr/libexec/dracut/init
  62     switchroot=/usr/libexec/dracut/switch_root
  63     rulesdir=/usr/libexec/dracut/rules.d
  64 fi
  65
  66 initdir=$(mktemp -d -t initramfs.XXXXXX)
  67
  68 # executables that we have to have
  69 exe="/bin/bash /bin/mount /bin/mknod /bin/mkdir /sbin/modprobe /sbin/udevd /sbin/udevadm /sbin/nash /bin/kill /sbin/pidof /bin/sleep /bin/echo /usr/sbin/chroot"
  70 lvmexe="/sbin/lvm"
  71 cryptexe="/sbin/cryptsetup"
  72 # and some things that are nice for debugging
  73 debugexe="/bin/ls /bin/cat /bin/ln /bin/ps /bin/grep /bin/more"
  74 # udev things we care about
  75 udevexe="/lib/udev/vol_id"
  76
  77 # install base files
  78 for binary in $exe $debugexe $udevexe $lvmexe $cryptexe ; do
  79   inst $binary $initdir
  80 done
  81
  82 # FIXME: would be nice if we didn't have to know which rules to grab....
  83 # ultimately, /lib/initramfs/rules.d or somesuch which includes links/copies
  84 # of the rules we want so that we just copy those in would be best
  85 mkdir -p $initdir/lib/udev/rules.d
  86 for rule in /lib/udev/rules.d/40-redhat* /lib/udev/rules.d/50* /lib/udev/rules.d/60-persistent-storage.rules /lib/udev/rules.d/61*edd* /lib/udev/rules.d/64* /lib/udev/rules.d/80* /lib/udev/rules.d/95* $rulesdir/*.rules ; do
  87   cp $rule $initdir/lib/udev/rules.d
  88 done
  89
  90 # terminfo bits make things work better if you fall into interactive mode
  91 for f in $(find /lib/terminfo -type f) ; do cp  --parents $f "$initdir" ; done
  92
  93 # install our files
  94 cp $initfile $initdir/init
  95 cp $switchroot $initdir/sbin/switch_root
  96
  97 # and create some directory structure
  98 mkdir -p $initdir/etc $initdir/proc $initdir/sys $initdir/sysroot $initdir/dev/pts
  99
 100 # FIXME: hard-coded module list of doom.
 101 [ -z "$modules" ] && modules="=ata =block =drm dm-crypt aes sha256_generic aes_i586 cbc essiv"
 102
 103 mkdir -p $initdir/lib/modules/$kernel
 104 # expand out module deps, etc
 105 for mod in $(resolveAndExpandModules $modules) ; do
 106     installmodule $mod $initdir
 107 done
 108
 109 /sbin/depmod -a -b $initdir $kernel
 110 if [ $? -ne 0 ]; then
 111     error "\"/sbin/depmod -a $kernel\" failed."
 112     exit 1
 113 fi
 114
 115 # plymouth
 116 if [ -x /usr/libexec/plymouth/plymouth-populate-initrd ]; then
 117     /usr/libexec/plymouth/plymouth-populate-initrd -t "$initdir" || :
 118 fi
 119
 120 pushd $initdir >/dev/null
 121 find . |cpio -H newc -o |gzip -9 > $outfile
 122 popd >/dev/null