| #!/bin/sh |
| |
| fslist="proc sys dev run" |
| rodir=run/initramfs/ro |
| rwdir=run/initramfs/rw |
| upper=$rwdir/cow |
| work=$rwdir/work |
| |
| cd / |
| mkdir -p $fslist |
| mount dev dev -tdevtmpfs |
| mount sys sys -tsysfs |
| mount proc proc -tproc |
| if ! grep run proc/mounts |
| then |
| mount tmpfs run -t tmpfs -o mode=755,nodev |
| fi |
| |
| mkdir -p $rodir $rwdir |
| |
| cp -rp init shutdown update whitelist bin sbin usr lib etc var run/initramfs |
| |
| # To start a interactive shell with job control at this point, run |
| # getty 38400 ttyS4 |
| |
| findmtd() { |
| m=$(grep -xl "$1" /sys/class/mtd/*/name) |
| m=${m%/name} |
| m=${m##*/} |
| echo $m |
| } |
| |
| blkid_fs_type() { |
| # Emulate util-linux's `blkid -s TYPE -o value $1` |
| # Example busybox blkid output: |
| # # blkid /dev/mtdblock5 |
| # /dev/mtdblock5: TYPE="squashfs" |
| # Process output to extract TYPE value "squashfs". |
| blkid $1 | sed -e 's/^.*TYPE="//' -e 's/".*$//' |
| } |
| |
| probe_fs_type() { |
| fst=$(blkid_fs_type $1) |
| echo ${fst:=jffs2} |
| } |
| |
| # This fw_get_env_var is a possibly broken version of fw_printenv that |
| # does not check the crc or flag byte. |
| # The u-boot environment starts with a crc32, followed by a flag byte |
| # when a redundannt environment is configured, followed by var=value\0 sets. |
| # The flag byte for nand is a 1 byte counter; for nor it is a 1 or 0 byte. |
| |
| get_fw_env_var() { |
| # do we have 1 or 2 copies of the environment? |
| # count non-blank non-comment lines |
| # copies=$(grep -v ^# /etc/fw_env.config | grep -c [::alnum::]) |
| # ... we could if we had the fw_env.config in the initramfs |
| copies=2 |
| |
| # * Change \n to \r and \0 to \n |
| # * Skip to the 5th byte to skip over crc |
| # * then skip to the first or 2nd byte to skip over flag if it exists |
| # * stop parsing at first empty line corresponding to the |
| # double \0 at the end of the environment. |
| # * print the value of the variable name passed as argument |
| |
| envdev=$(findmtd u-boot-env) |
| if test -n $envdev |
| then |
| cat /dev/$envdev | |
| tr '\n\000' '\r\n' | |
| tail -c +5 | tail -c +${copies-1} | |
| sed -ne '/^$/,$d' -e "s/^$1=//p" |
| fi |
| } |
| |
| setup_resolv() { |
| runresolv=/run/systemd/resolve/resolv.conf |
| etcresolv=/etc/resolv.conf |
| |
| if test ! -e $etcresolv -a ! -L $etcresolv |
| then |
| mkdir -p ${runresolv%/*} |
| ln -s $runresolv $etcresolv |
| fi |
| if test ! -f $runresolv |
| then |
| cat /proc/net/pnp > $runresolv |
| fi |
| |
| return 0 |
| } |
| |
| try_tftp() { |
| # split into tftp:// host:port/ path/on/remote |
| # then spilt off / and then :port from the end of host:port/ |
| # and : from the beginning of port |
| |
| rest="${1#tftp://}" |
| path=${rest#*/} |
| host=${rest%$path} |
| host="${host%/}" |
| port="${host#${host%:*}}" |
| host="${host%$port}" |
| port="${port#:}" |
| |
| setup_resolv |
| |
| if test -z "$host" -o -z "$path" |
| then |
| debug_takeover "Invalid tftp download url '$url'." |
| elif echo "Downloading '$url' from $host ..." && |
| ! tftp -g -r "$path" -l /run/image-rofs "$host" ${port+"$port"} |
| then |
| debug_takeover "Download of '$url' failed." |
| fi |
| } |
| |
| try_wget() { |
| setup_resolv |
| |
| echo "Downloading '$1' ..." |
| if ! wget -O /run/image-rofs "$1" |
| then |
| debug_takeover "Download of '$url' failed." |
| fi |
| } |
| |
| debug_takeover() { |
| echo "$@" |
| |
| if ! grep -w enable-initrd-debug-sh "$optfile" |
| then |
| echo "Fatal error, triggering kernel panic!" |
| exit 1 |
| fi |
| |
| test -n "$@" && echo Try to manually fix. |
| cat << HERE |
| After fixing run exit to continue this script, or reboot -f to retry, or |
| touch /takeover and exit to become PID 1 allowing editing of this script. |
| HERE |
| |
| while ! /bin/sh && ! test -f /takeover |
| do |
| echo /bin/sh failed, retrying |
| done |
| |
| # Touch /takeover in the above shell to become pid 1 |
| if test -e /takeover |
| then |
| cat << HERE |
| |
| Takeover of init requested. Executing /bin/sh as PID 1. |
| When finished exec new init or cleanup and run reboot -f. |
| |
| Warning: No job control! Shell exit will panic the system! |
| HERE |
| export PS1=init#\ |
| exec /bin/sh |
| fi |
| } |
| |
| rofs=$(findmtd rofs) |
| rwfs=$(findmtd rwfs) |
| |
| rodev=/dev/mtdblock${rofs#mtd} |
| rwdev=/dev/mtdblock${rwfs#mtd} |
| |
| # Set to y for yes, anything else for no. |
| force_rwfst_jffs2=y |
| flash_images_before_init=n |
| consider_download_files=y |
| consider_download_tftp=y |
| consider_download_http=y |
| consider_download_ftp=y |
| |
| rofst=squashfs |
| rwfst=$(probe_fs_type $rwdev) |
| roopts=ro |
| rwopts=rw |
| |
| image=/run/initramfs/image- |
| trigger=${image}rwfs |
| |
| init=/sbin/init |
| fsckbase=/sbin/fsck. |
| fsck=$fsckbase$rwfst |
| fsckopts=-a |
| optfile=/run/initramfs/init-options |
| optbase=/run/initramfs/init-options-base |
| urlfile=/run/initramfs/init-download-url |
| update=/run/initramfs/update |
| |
| if test -e /${optfile##*/} |
| then |
| cp /${optfile##*/} $optfile |
| fi |
| |
| if test -e /${optbase##*/} |
| then |
| cp /${optbase##*/} $optbase |
| else |
| touch $optbase |
| fi |
| |
| if test ! -f $optfile |
| then |
| cat /proc/cmdline $optbase > $optfile |
| get_fw_env_var openbmcinit >> $optfile |
| get_fw_env_var openbmconce >> $optfile |
| fi |
| |
| echo rofs = $rofs $rofst rwfs = $rwfs $rwfst |
| |
| if grep -w debug-init-sh $optfile |
| then |
| if grep -w enable-initrd-debug-sh "$optfile" |
| then |
| debug_takeover "Debug initial shell requested by command line." |
| else |
| echo "Need to also add enable-initrd-debug-sh for debug shell." |
| fi |
| fi |
| |
| if test "x$consider_download_files" = xy && |
| grep -w openbmc-init-download-files $optfile |
| then |
| if test -f ${urlfile##*/} |
| then |
| cp ${urlfile##*/} $urlfile |
| fi |
| if test ! -f $urlfile |
| then |
| get_fw_env_var openbmcinitdownloadurl > $urlfile |
| fi |
| url="$(cat $urlfile)" |
| rest="${url#*://}" |
| proto="${url%$rest}" |
| |
| if test -z "$url" |
| then |
| echo "Download url empty. Ignoring download request." |
| elif test -z "$proto" |
| then |
| echo "Download failed." |
| elif test "$proto" = tftp:// |
| then |
| if test "x$consider_download_tftp" = xy |
| then |
| try_tftp "$url" |
| else |
| echo "Download failed." |
| fi |
| elif test "$proto" = http:// |
| then |
| if test "x$consider_download_http" = xy |
| then |
| try_wget "$url" |
| else |
| echo "Download failed." |
| fi |
| elif test "$proto" = ftp:// |
| then |
| if test "x$consider_download_ftp" = xy |
| then |
| try_wget "$url" |
| else |
| echo "Download failed." |
| fi |
| else |
| echo "Download failed." |
| fi |
| fi |
| |
| # If there are images in root move them to /run/initramfs/ or /run/ now. |
| imagebasename=${image##*/} |
| if test -n "${imagebasename}" && ls /${imagebasename}* > /dev/null 2>&1 |
| then |
| if test "x$flash_images_before_init" = xy |
| then |
| echo "Flash images found, will update before starting init." |
| mv /${imagebasename}* ${image%$imagebasename} |
| else |
| echo "Flash images found, will use but deferring flash update." |
| mv /${imagebasename}* /run/ |
| fi |
| fi |
| |
| if grep -w clean-rwfs-filesystem $optfile |
| then |
| echo "Cleaning of read-write overlay filesystem requested." |
| touch $trigger |
| fi |
| |
| if grep -w factory-reset $optfile |
| then |
| echo "Factory reset requested." |
| touch $trigger |
| do_save=--no-save-files |
| else |
| do_save=--save-files |
| fi |
| |
| if test "x$force_rwfst_jffs2" = xy -a $rwfst != jffs2 -a ! -f $trigger |
| then |
| echo "Converting read-write overlay filesystem to jffs2 forced." |
| touch $trigger |
| fi |
| |
| if ls $image* > /dev/null 2>&1 |
| then |
| if ! test -x $update |
| then |
| debug_takeover "Flash update requested but $update missing!" |
| elif test -f $trigger -a ! -s $trigger |
| then |
| if [ $do_save = "--save-files" ] |
| then |
| echo "Saving selected files from read-write overlay filesystem." |
| else |
| echo "No files will be selected for save." |
| fi |
| $update --no-restore-files $do_save |
| echo "Clearing read-write overlay filesystem." |
| flash_eraseall /dev/$rwfs |
| echo "Restoring saved files to read-write overlay filesystem." |
| touch $trigger |
| $update --no-save-files --clean-saved-files |
| else |
| $update --clean-saved-files $do_save |
| fi |
| |
| rwfst=$(probe_fs_type $rwdev) |
| fsck=$fsckbase$rwfst |
| fi |
| |
| if grep -w overlay-filesystem-in-ram $optfile |
| then |
| rwfst=none |
| fi |
| |
| copyfiles= |
| if grep -w copy-files-to-ram $optfile |
| then |
| rwfst=none |
| copyfiles=y |
| fi |
| |
| # It would be nice to do this after fsck but that mean rofs is mounted |
| # which triggers the mtd is mounted check |
| if test "$rwfst$copyfiles" = noney |
| then |
| touch $trigger |
| $update --copy-files --clean-saved-files --no-restore-files |
| fi |
| |
| if grep -w copy-base-filesystem-to-ram $optfile && |
| test ! -e /run/image-rofs && ! cp $rodev /run/image-rofs |
| then |
| # Remove any partial copy to avoid attempted usage later |
| if test -e /run/image-rofs |
| then |
| ls -l /run/image-rofs |
| rm -f /run/image-rofs |
| fi |
| debug_takeover "Copying $rodev to /run/image-rofs failed." |
| fi |
| |
| if test -s /run/image-rofs |
| then |
| rodev=/run/image-rofs |
| roopts=$roopts,loop |
| fi |
| |
| mount $rodev $rodir -t $rofst -o $roopts |
| |
| if test -x $rodir$fsck |
| then |
| for fs in $fslist |
| do |
| mount --bind $fs $rodir/$fs |
| done |
| chroot $rodir $fsck $fsckopts $rwdev |
| rc=$? |
| for fs in $fslist |
| do |
| umount $rodir/$fs |
| done |
| if test $rc -gt 1 |
| then |
| debug_takeover "fsck of read-write fs on $rwdev failed (rc=$rc)" |
| fi |
| elif test "$rwfst" != jffs2 -a "$rwfst" != none |
| then |
| echo "No '$fsck' in read only fs, skipping fsck." |
| fi |
| |
| if test "$rwfst" = none |
| then |
| echo "Running with read-write overlay in RAM for this boot." |
| echo "No state will be preserved unless flash update performed." |
| elif ! mount $rwdev $rwdir -t $rwfst -o $rwopts |
| then |
| msg="$(cat)" << HERE |
| |
| Mounting read-write $rwdev filesystem failed. Please fix and run |
| mount $rwdev $rwdir -t $rwfst -o $rwopts |
| or perform a factory reset with the clean-rwfs-filesystem option. |
| HERE |
| debug_takeover "$msg" |
| fi |
| |
| # Empty workdir; do not remove workdir itself for it will fail to recreate it if |
| # RWFS is full |
| if [ -d $work ] |
| then |
| find $work -maxdepth 1 -mindepth 1 -exec rm -rf '{}' + |
| fi |
| |
| mkdir -p $upper $work |
| |
| mount -t overlay -o lowerdir=$rodir,upperdir=$upper,workdir=$work cow /root |
| |
| while ! chroot /root /bin/sh -c "test -x '$init' -a -s '$init'" |
| do |
| msg="$(cat)" << HERE |
| |
| Unable to confirm /sbin/init is an executable non-empty file |
| in merged file system mounted at /root. |
| |
| Change Root test failed! |
| HERE |
| debug_takeover "$msg" |
| done |
| |
| for f in $fslist |
| do |
| mount --move $f root/$f |
| done |
| |
| exec switch_root /root $init |