1#!/bin/sh 2 3fslist="proc sys dev run" 4rodir=run/initramfs/ro 5rwdir=run/initramfs/rw 6upper=$rwdir/cow 7work=$rwdir/work 8 9cd / 10mkdir -p $fslist 11mount dev dev -tdevtmpfs 12mount sys sys -tsysfs 13mount proc proc -tproc 14if ! grep run proc/mounts 15then 16 mount tmpfs run -t tmpfs -o mode=755,nodev 17fi 18 19mkdir -p $rodir $rwdir 20 21cp -rp init shutdown update whitelist bin sbin usr lib etc var run/initramfs 22 23# To start a interactive shell with job control at this point, run 24# getty 38400 ttyS4 25 26findmtd() { 27 m=$(grep -xl "$1" /sys/class/mtd/*/name) 28 m=${m%/name} 29 m=${m##*/} 30 echo $m 31} 32 33blkid_fs_type() { 34 # Emulate util-linux's `blkid -s TYPE -o value $1` 35 # Example busybox blkid output: 36 # # blkid /dev/mtdblock5 37 # /dev/mtdblock5: TYPE="squashfs" 38 # Process output to extract TYPE value "squashfs". 39 blkid $1 | sed -e 's/^.*TYPE="//' -e 's/".*$//' 40} 41 42probe_fs_type() { 43 fst=$(blkid_fs_type $1) 44 echo ${fst:=jffs2} 45} 46 47# This fw_get_env_var is a possibly broken version of fw_printenv that 48# does not check the crc or flag byte. 49# The u-boot environment starts with a crc32, followed by a flag byte 50# when a redundannt environment is configured, followed by var=value\0 sets. 51# The flag byte for nand is a 1 byte counter; for nor it is a 1 or 0 byte. 52 53get_fw_env_var() { 54 # do we have 1 or 2 copies of the environment? 55 # count non-blank non-comment lines 56 # copies=$(grep -v ^# /etc/fw_env.config | grep -c [::alnum::]) 57 # ... we could if we had the fw_env.config in the initramfs 58 copies=2 59 60 # * Change \n to \r and \0 to \n 61 # * Skip to the 5th byte to skip over crc 62 # * then skip to the first or 2nd byte to skip over flag if it exists 63 # * stop parsing at first empty line corresponding to the 64 # double \0 at the end of the environment. 65 # * print the value of the variable name passed as argument 66 67 envdev=$(findmtd u-boot-env) 68 if test -n $envdev 69 then 70 cat /dev/$envdev | 71 tr '\n\000' '\r\n' | 72 tail -c +5 | tail -c +${copies-1} | 73 sed -ne '/^$/,$d' -e "s/^$1=//p" 74 fi 75} 76 77setup_resolv() { 78 runresolv=/run/systemd/resolve/resolv.conf 79 etcresolv=/etc/resolv.conf 80 81 if test ! -e $etcresolv -a ! -L $etcresolv 82 then 83 mkdir -p ${runresolv%/*} 84 ln -s $runresolv $etcresolv 85 fi 86 if test ! -f $runresolv 87 then 88 cat /proc/net/pnp > $runresolv 89 fi 90 91 return 0 92} 93 94try_tftp() { 95 # split into tftp:// host:port/ path/on/remote 96 # then spilt off / and then :port from the end of host:port/ 97 # and : from the beginning of port 98 99 rest="${1#tftp://}" 100 path=${rest#*/} 101 host=${rest%$path} 102 host="${host%/}" 103 port="${host#${host%:*}}" 104 host="${host%$port}" 105 port="${port#:}" 106 107 setup_resolv 108 109 if test -z "$host" -o -z "$path" 110 then 111 debug_takeover "Invalid tftp download url '$url'." 112 elif echo "Downloading '$url' from $host ..." && 113 ! tftp -g -r "$path" -l /run/image-rofs "$host" ${port+"$port"} 114 then 115 debug_takeover "Download of '$url' failed." 116 fi 117} 118 119try_wget() { 120 setup_resolv 121 122 echo "Downloading '$1' ..." 123 if ! wget -O /run/image-rofs "$1" 124 then 125 debug_takeover "Download of '$url' failed." 126 fi 127} 128 129debug_takeover() { 130 echo "$@" 131 test -n "$@" && echo Enter password to try to manually fix. 132 cat << HERE 133After fixing run exit to continue this script, or reboot -f to retry, or 134touch /takeover and exit to become PID 1 allowing editing of this script. 135HERE 136 137 while ! sulogin && ! test -f /takeover 138 do 139 echo getty failed, retrying 140 done 141 142 # Touch /takeover in the above getty to become pid 1 143 if test -e /takeover 144 then 145 cat << HERE 146 147Takeover of init requested. Executing /bin/sh as PID 1. 148When finished exec new init or cleanup and run reboot -f. 149 150Warning: No job control! Shell exit will panic the system! 151HERE 152 export PS1=init#\ 153 exec /bin/sh 154 fi 155} 156 157rofs=$(findmtd rofs) 158rwfs=$(findmtd rwfs) 159 160rodev=/dev/mtdblock${rofs#mtd} 161rwdev=/dev/mtdblock${rwfs#mtd} 162 163# Set to y for yes, anything else for no. 164force_rwfst_jffs2=y 165flash_images_before_init=n 166consider_download_files=y 167consider_download_tftp=y 168consider_download_http=y 169consider_download_ftp=y 170 171rofst=squashfs 172rwfst=$(probe_fs_type $rwdev) 173roopts=ro 174rwopts=rw 175 176image=/run/initramfs/image- 177trigger=${image}rwfs 178 179init=/sbin/init 180fsckbase=/sbin/fsck. 181fsck=$fsckbase$rwfst 182fsckopts=-a 183optfile=/run/initramfs/init-options 184optbase=/run/initramfs/init-options-base 185urlfile=/run/initramfs/init-download-url 186update=/run/initramfs/update 187 188if test -e /${optfile##*/} 189then 190 cp /${optfile##*/} $optfile 191fi 192 193if test -e /${optbase##*/} 194then 195 cp /${optbase##*/} $optbase 196else 197 touch $optbase 198fi 199 200if test ! -f $optfile 201then 202 cat /proc/cmdline $optbase > $optfile 203 get_fw_env_var openbmcinit >> $optfile 204 get_fw_env_var openbmconce >> $optfile 205fi 206 207echo rofs = $rofs $rofst rwfs = $rwfs $rwfst 208 209if grep -w debug-init-sh $optfile 210then 211 debug_takeover "Debug initial shell requested by command line." 212fi 213 214if test "x$consider_download_files" = xy && 215 grep -w openbmc-init-download-files $optfile 216then 217 if test -f ${urlfile##*/} 218 then 219 cp ${urlfile##*/} $urlfile 220 fi 221 if test ! -f $urlfile 222 then 223 get_fw_env_var openbmcinitdownloadurl > $urlfile 224 fi 225 url="$(cat $urlfile)" 226 rest="${url#*://}" 227 proto="${url%$rest}" 228 229 if test -z "$url" 230 then 231 echo "Download url empty. Ignoring download request." 232 elif test -z "$proto" 233 then 234 echo "Download failed." 235 elif test "$proto" = tftp:// 236 then 237 if test "x$consider_download_tftp" = xy 238 then 239 try_tftp "$url" 240 else 241 echo "Download failed." 242 fi 243 elif test "$proto" = http:// 244 then 245 if test "x$consider_download_http" = xy 246 then 247 try_wget "$url" 248 else 249 echo "Download failed." 250 fi 251 elif test "$proto" = ftp:// 252 then 253 if test "x$consider_download_ftp" = xy 254 then 255 try_wget "$url" 256 else 257 echo "Download failed." 258 fi 259 else 260 echo "Download failed." 261 fi 262fi 263 264# If there are images in root move them to /run/initramfs/ or /run/ now. 265imagebasename=${image##*/} 266if test -n "${imagebasename}" && ls /${imagebasename}* > /dev/null 2>&1 267then 268 if test "x$flash_images_before_init" = xy 269 then 270 echo "Flash images found, will update before starting init." 271 mv /${imagebasename}* ${image%$imagebasename} 272 else 273 echo "Flash images found, will use but deferring flash update." 274 mv /${imagebasename}* /run/ 275 fi 276fi 277 278if grep -w clean-rwfs-filesystem $optfile 279then 280 echo "Cleaning of read-write overlay filesystem requested." 281 touch $trigger 282fi 283 284if grep -w factory-reset $optfile 285then 286 echo "Factory reset requested." 287 touch $trigger 288 do_save=--no-save-files 289else 290 do_save=--save-files 291fi 292 293if test "x$force_rwfst_jffs2" = xy -a $rwfst != jffs2 -a ! -f $trigger 294then 295 echo "Converting read-write overlay filesystem to jffs2 forced." 296 touch $trigger 297fi 298 299if ls $image* > /dev/null 2>&1 300then 301 if ! test -x $update 302 then 303 debug_takeover "Flash update requested but $update missing!" 304 elif test -f $trigger -a ! -s $trigger 305 then 306 if [ $do_save = "--save-files" ] 307 then 308 echo "Saving selected files from read-write overlay filesystem." 309 else 310 echo "No files will be selected for save." 311 fi 312 $update --no-restore-files $do_save 313 echo "Clearing read-write overlay filesystem." 314 flash_eraseall /dev/$rwfs 315 echo "Restoring saved files to read-write overlay filesystem." 316 touch $trigger 317 $update --no-save-files --clean-saved-files 318 else 319 $update --clean-saved-files $do_save 320 fi 321 322 rwfst=$(probe_fs_type $rwdev) 323 fsck=$fsckbase$rwfst 324fi 325 326if grep -w overlay-filesystem-in-ram $optfile 327then 328 rwfst=none 329fi 330 331copyfiles= 332if grep -w copy-files-to-ram $optfile 333then 334 rwfst=none 335 copyfiles=y 336fi 337 338# It would be nice to do this after fsck but that mean rofs is mounted 339# which triggers the mtd is mounted check 340if test "$rwfst$copyfiles" = noney 341then 342 touch $trigger 343 $update --copy-files --clean-saved-files --no-restore-files 344fi 345 346if grep -w copy-base-filesystem-to-ram $optfile && 347 test ! -e /run/image-rofs && ! cp $rodev /run/image-rofs 348then 349 # Remove any partial copy to avoid attempted usage later 350 if test -e /run/image-rofs 351 then 352 ls -l /run/image-rofs 353 rm -f /run/image-rofs 354 fi 355 debug_takeover "Copying $rodev to /run/image-rofs failed." 356fi 357 358if test -s /run/image-rofs 359then 360 rodev=/run/image-rofs 361 roopts=$roopts,loop 362fi 363 364mount $rodev $rodir -t $rofst -o $roopts 365 366if test -x $rodir$fsck 367then 368 for fs in $fslist 369 do 370 mount --bind $fs $rodir/$fs 371 done 372 chroot $rodir $fsck $fsckopts $rwdev 373 rc=$? 374 for fs in $fslist 375 do 376 umount $rodir/$fs 377 done 378 if test $rc -gt 1 379 then 380 debug_takeover "fsck of read-write fs on $rwdev failed (rc=$rc)" 381 fi 382elif test "$rwfst" != jffs2 -a "$rwfst" != none 383then 384 echo "No '$fsck' in read only fs, skipping fsck." 385fi 386 387if test "$rwfst" = none 388then 389 echo "Running with read-write overlay in RAM for this boot." 390 echo "No state will be preserved unless flash update performed." 391elif ! mount $rwdev $rwdir -t $rwfst -o $rwopts 392then 393 msg="$(cat)" << HERE 394 395Mounting read-write $rwdev filesystem failed. Please fix and run 396 mount $rwdev $rwdir -t $rwfst -o $rwopts 397to to continue, or do change nothing to run from RAM for this boot. 398HERE 399 debug_takeover "$msg" 400fi 401 402rm -rf $work 403mkdir -p $upper $work 404 405mount -t overlay -o lowerdir=$rodir,upperdir=$upper,workdir=$work cow /root 406 407while ! chroot /root /bin/sh -c "test -x '$init' -a -s '$init'" 408do 409 msg="$(cat)" << HERE 410 411Unable to confirm /sbin/init is an executable non-empty file 412in merged file system mounted at /root. 413 414Change Root test failed! Invoking emergency shell. 415HERE 416 debug_takeover "$msg" 417done 418 419for f in $fslist 420do 421 mount --move $f root/$f 422done 423 424# switch_root /root $init 425exec chroot /root $init 426 427