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pascal@276
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1 #!/bin/sh
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2
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3 ### catched kernel parameters :
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4 #
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5 # modprobe=
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6 # list of modules to load, example modprobe=r8169,btrfs
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7 #
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8 ### Frugal mode or live CD : using root ram disk
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9 #
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10 # tmpram= [RAMDISK]
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11 # minimum % of free RAM to build the root tmpfs, default 100
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12 # a lower value may work, such as 50
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13 # rootfssize= [RAMDISK]
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14 # size of / regarding the RAM size, default 90%
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15 #
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16 ### Indirect mode an initramfs is used to mount root from the hard disk.
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17 ### Any rootfs should fit, minimum required is slitaz-base
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18 #
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19 # mount= [MOUNT]
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20 # device with root loop file or sub directory
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21 # posixovl [MOUNT]
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22 # use posix attributes on a non posix filesystem (VFAT, NTFS...)
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23 # loopfs= [MOUNT]
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24 # loop file for root filesystem
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25 # subroot= [MOUNT]
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26 # sub directory for root filesystem
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27 # bindfs= [MOUNT]
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28 # bind out of root tree part
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29 #
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30 ### Special disk driver mode needs extra modules/softwares form preinit flavor.
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31 #
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32 # dmraid= [RAID]
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33 # root semi hardware raid device name in /dev/mapper
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34 # softraid= [RAID]
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35 # root software device name in /dev/mapper
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36 # lvmroot= [LVM]
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37 # root logical volume name in /dev/mapper
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38 # cryptoroot= [CRYPTO]
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39 # encrypted root device using luks or loop-aes
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40 #
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41 ### Special mode used by loram flavor with aufs & squashfs
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42 #
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43 # rodev= [LORAM][MERGE]
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44 # device (+ optional path) for the read only aufs branch
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45 # rwdev= [LORAM][MERGE]
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46 # (persitant) device for the r/w aufs branch instead of the ramfs
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47 # isofs [LORAM]
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48 # do not use squashfs filesystem images, but the cdrom filesystem only
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49
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50 fail()
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51 {
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52 echo -e '\033[70G[ \033[1;3'${1:-1mFailed}'\033[0;39m ]'
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53 }
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54
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55 quit()
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56 {
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57 [ -d /mnt$4/etc ] || return
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58 [ -n "$4" ] || mount /mnt -o remount,ro
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59 mount --move /run /mnt/${1:-run}
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60 cat>/run/init<<EOT
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61 $2
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62 x=/sbin/switch_root
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63 [ -x \$x ] && exec \$x mnt $3 /sbin/init
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64 EOT
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65 fail 2mDone
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66 exit
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67 }
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68
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69 arg()
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70 {
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71 grep -q $1 /proc/cmdline
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72 }
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73
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74 got()
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75 {
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76 arg $1= && root="$(sed "s/.*$1=\([^ ]*\).*/\1/" </proc/cmdline)"
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77 }
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78
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79 msg()
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80 {
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81 echo "Switching / to $1..."
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82 }
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83
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84 use()
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85 {
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86 got $1 && msg "$1 $root"
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87 }
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88
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89 mnt()
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90 {
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91 r=${root#/dev/}
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92 r=/dev/${r%%/*}
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93 d=${root#*$r}
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94 mount $r $1 && return
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95 w=$(cat /sys/module/usb_storage/parameters/delay_use)
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96 w=$((1+${w:-2}))
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97 echo -n "Sleep $w seconds..."
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98 sleep $w
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99 mount $r $1
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100 }
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101
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102 mod()
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103 {
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104 for i in $@
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105 do echo "Loading module: $i"
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106 modprobe $i 2>/dev/null || insmod $(find /lib/modules|sed "/$i.ko/!dq")
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107 done
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108 }
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109
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110 try()
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111 {
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112 if [ ! -d /mnt/etc ] && got cryptoroot
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113 then mod dm-mod dm-crypt aes-256
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114 d=${root#/dev/}
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115 l=crypto-$d
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116 if cryptsetup isLuks $root 2>/dev/null; then
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117 cryptsetup luksOpen $root $l
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118 else
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119 read -st 60 -p "Pass phrase : " p
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120 k=$(echo $p|hashalot -x -n 32 sha512)
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121 echo 0 $(cat $(find /sys/block|grep /$d/size))\
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122 crypt aes-plain $k 0 $root 0|dmsetup create $l
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123 fi
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124 mount /dev/mapper/$l /mnt
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125 fi
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126 got subroot && return
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127 got loopfs && return
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128 if [ -d /mnt/etc ]
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129 then for i in $@; do cp -a $i /mnt$(dirname $i); done
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130 quit
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131 fi
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132 fail
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133 }
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134
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135 lvm()
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136 {
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137 use lvmroot || return
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138 mod dm-mod
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139 vgscan --ignorelockingfailure
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140 vgchange -ay --ignorelockingfailure
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141 mount /dev/mapper/$root /mnt
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142 try /dev/mapper $1
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143 }
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144
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145 ldraid()
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146 {
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147 while read l
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148 do case "$l" in
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149 *raid10*) mod raid10;;
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150 *raid0*) mod raid0;;
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151 *raid1*) mod raid1;;
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152 *raid*) mod raid456;;
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153 *mirror*) mod dm-mirror
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154 esac
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155 done
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156 }
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157
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158 if [ "$1" != "log" ]
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159 then mount -t proc proc /proc
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160 mount -t sysfs sys /sys
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161 mount -t tmpfs tmpfs /run
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162 x=/sbin/init; echo "[ -x $x ] && exec $x" >/run/init
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163 $0 log 2>&1 | tee /run/boot.log
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164 umount /proc
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165 umount /sys
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166 . /run/init
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167 sh
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168 fi
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169 got modprobe && mod ${root//,/ }
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170 ln -s $(sed '/name/!ds/.*:[^a-z]*//' /proc/sys/dev/cdrom/info) /dev/cdrom
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171 if use dmraid
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172 then dmraid -s|sed '/^type/!ds/.*: *//'|ldraid
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173 [ ${root:0:4} = /dev ] ||
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174 root=/dev/mapper/$(dmraid -s|sed '/^name/!ds/.*: *//')p${root#p}
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175 dmraid -ay
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176 fi
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177 if use softraid
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178 then mdadm -E -s -c partitions>/etc/mdadm.conf
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179 grep -qs " $root " /etc/mdadm.conf ||
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180 root=$(awk '/dev.md/{print $2;exit}'</etc/mdadm.conf)
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181 grep level=raid /etc/mdadm.conf|ldraid
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182 for i in 1 2 3 4 5 6 7 8 9
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183 do sleep $i
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184 mdadm -A -s
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185 grep -qs ': act' /proc/mdstat && break
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186 done
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187 lvm /etc/mdadm.conf
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188 fi
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189 lvm
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190 if got mount
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191 then dev=$root
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192 x=$(blkid|grep $dev|sed 's/:.*//;q')
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193 root=${x:-$dev}
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194 [ "$dev" = "$root" ] || dev="$root ($dev)"
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195 echo "Mount $dev..."
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196 mnt /mnt
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197 arg posixovl && echo "And posixovl..." && mount.posixovl -F /mnt
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198 fi
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199 got loopfs && echo "Into file $root..." &&
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200 losetup /dev/loop0 /mnt/$root && mount /dev/loop0 /mnt
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201 got bindfs && echo "Bind ${root/,/ to }..." &&
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202 mount --bind /mnt/${root%,*} /mnt/${root/,//}
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203 arg cryptoroot= && try
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204 if use subroot
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205 then cp $(LD_TRACE_LOADED_OBJECTS=1 /lib/ld*.so /usr/sbin/chroot | sed\
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206 's|.*=> \(/lib/l[^ ]*\).*|\1|;/^\//!d') /usr/sbin/chroot /run
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207 r=$root/run
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208 quit $r "export LD_LIBRARY_PATH=$r:/lib"\
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209 "$root$(ls /run/ld-*so) $r/chroot $root" "/$root"
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210 fi
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211 quit
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212 msg tmpfs
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213 root=100
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214 got tmpram
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215 r=$root
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216 root=90%
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217 got rootfssize
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218 [ $(busybox free|busybox awk '/Mem:/{print int(($4*100)/$3)}') -ge $r ] &&
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219 mount -t tmpfs -o size=$root tmpfs /mnt &&
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220 for i in $(ls -ar /)
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221 do case "$i" in
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222 .*|cdrom) ;;
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223 mnt|proc|sys) mkdir /mnt/$i;;
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224 usr|var|rootfs*) mv /$i /mnt;;
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225 *) cp -a /$i /mnt 2>/dev/null && continue
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226 fail
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227 umount /mnt
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228 exit
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229 esac
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230 done || fail 3mSkipped
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231 quit
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232 mod squashfs 2>/dev/null || exit
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233 msg aufs
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234 br=/mnt/.rw
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235 mkdir $br
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236 got rwdev && mnt $br && br=$br$d
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237 o=
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238 p=
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239 c=/mnt/.cdrom
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240 if [ -z "$(ls /mnt/rootfs* 2>/dev/null)" ]
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241 then root=/dev/cdrom/fs
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242 got rodev
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243 mkdir -p $c /mnt$c /mnt/.rw$c
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244 mnt $c
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245 o="-o 124"
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246 p=/.cdrom/boot
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247 c=$c$d
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248 fi
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249 l=0
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250 r=
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251 got isofs || for i in /mnt$p/rootfs?*.gz
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252 do fs=${i#*root}
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253 r=$r:/mnt/.$fs
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254 mkdir -p /mnt/.rw/mnt/.$fs /mnt/.$fs
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255 losetup $o /dev/loop$l $i
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256 mount -o ro -t squashfs /dev/loop$((l++)) /mnt/.$fs
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257 done
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258 mod aufs
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259 mount -t aufs -o br=$br${r:-:$c} none /mnt
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260 quit
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