blob: 9512c762c8d6dd14353325cec3ad904f52c7bed0 [file] [log] [blame]
Mykola Kostenok4d17df62017-09-01 09:56:45 +03001#!/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 $rwdir
20
21cp -rp init failsafe recovery shutdown update update_all whitelist bin sbin usr lib etc var run/initramfs
22
23# To start a interactive shell with job control at this point, run
24# getty 38400 ttyS4
25
26findmtd() {
27 m=$(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 ${fst:=jffs2}
45}
46
47# This fw_get_env_var is a possibly broken version of fw_printenv that
48# does not check the crc or flag byte.
Gunnar Millseef5a512018-08-31 12:39:01 -050049# The u-boot environment starts with a crc32, followed by a flag byte
Mykola Kostenok4d17df62017-09-01 09:56:45 +030050# when a redundannt environment is configured, followed by var=value\0 sets.
51# The flag byte for nand is a 1 byte counter; for nor it is a 1 or 0 byte.
52
53get_fw_env_var() {
54 # do we have 1 or 2 copies of the environment?
55 # count non-blank non-comment lines
56 # copies=$(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
157env=$(findmtd u-boot-env)
158if test -n $env
159then
160 ln -s /dev/$env /run/mtd:u-boot-env
161 cp /run/mtd:u-boot-env /run/fw_env
162fi
163
164rofs=$(findmtd rofs)
165rwfs=$(findmtd rwfs)
166
167rodev=/dev/mtdblock${rofs#mtd}
168rwdev=/dev/mtdblock${rwfs#mtd}
169
170# Set to y for yes, anything else for no.
171force_rwfst_jffs2=y
172flash_images_before_init=n
173consider_download_files=y
174consider_download_tftp=y
175consider_download_http=y
176consider_download_ftp=y
177
178rofst=squashfs
179rwfst=$(probe_fs_type $rwdev)
180roopts=ro
181rwopts=rw
182
183image=/run/initramfs/image-
184trigger=${image}rwfs
185
186init=/sbin/init
187failsafe=/run/initramfs/failsafe
188fsckbase=/sbin/fsck.
189fsck=$fsckbase$rwfst
190fsckopts=-a
191optfile=/run/initramfs/init-options
192optbase=/run/initramfs/init-options-base
193urlfile=/run/initramfs/init-download-url
194update=/run/initramfs/update
195
196if test -e /${optfile##*/}
197then
198 cp /${optfile##*/} $optfile
199fi
200
201if test -e /${optbase##*/}
202then
203 cp /${optbase##*/} $optbase
204else
205 touch $optbase
206fi
207
208if test ! -f $optfile
209then
210 cat /proc/cmdline $optbase > $optfile
211 get_fw_env_var openbmcinit >> $optfile
212 get_fw_env_var openbmconce >> $optfile
213fi
214
215echo rofs = $rofs $rofst rwfs = $rwfs $rwfst
216
217if grep -w debug-init-sh $optfile
218then
219 debug_takeover "Debug initial shell requested by command line."
220fi
221
222if test "x$consider_download_files" = xy &&
223 grep -w openbmc-init-download-files $optfile
224then
225 if test -f ${urlfile##*/}
226 then
227 cp ${urlfile##*/} $urlfile
228 fi
229 if test ! -f $urlfile
230 then
231 get_fw_env_var openbmcinitdownloadurl > $urlfile
232 fi
233 url="$(cat $urlfile)"
234 rest="${url#*://}"
235 proto="${url%$rest}"
236
237 if test -z "$url"
238 then
239 echo "Download url empty. Ignoring download request."
240 elif test -z "$proto"
241 then
242 echo "Download failed."
243 elif test "$proto" = tftp://
244 then
245 if test "x$consider_download_tftp" = xy
246 then
247 try_tftp "$url"
248 else
249 echo "Download failed."
250 fi
251 elif test "$proto" = http://
252 then
253 if test "x$consider_download_http" = xy
254 then
255 try_wget "$url"
256 else
257 echo "Download failed."
258 fi
259 elif test "$proto" = ftp://
260 then
261 if test "x$consider_download_ftp" = xy
262 then
263 try_wget "$url"
264 else
265 echo "Download failed."
266 fi
267 else
268 echo "Download failed."
269 fi
270fi
271
272# If there are images in root move them to /run/initramfs/ or /run/ now.
273imagebasename=${image##*/}
274if test -n "${imagebasename}" && ls /${imagebasename}* > /dev/null 2>&1
275then
276 if test "x$flash_images_before_init" = xy
277 then
278 echo "Flash images found, will update before starting init."
279 mv /${imagebasename}* ${image%$imagebasename}
280 else
281 echo "Flash images found, will use but deferring flash update."
282 mv /${imagebasename}* /run/
283 fi
284fi
285
286if grep -w clean-rwfs-filesystem $optfile
287then
288 echo "Cleaning of read-write overlay filesystem requested."
289 touch $trigger
290fi
291
292if test "x$force_rwfst_jffs2" = xy -a $rwfst != jffs2 -a ! -f $trigger
293then
294 echo "Converting read-write overlay filesystem to jffs2 forced."
295 touch $trigger
296fi
297
298if ls $image* > /dev/null 2>&1
299then
300 if ! test -x $update
301 then
302 debug_takeover "Flash update requested but $update missing!"
303 elif test -f $trigger -a ! -s $trigger
304 then
305 echo "Saving selected files from read-write overlay filesystem."
306 $update --no-restore-files
307 echo "Clearing read-write overlay filesystem."
308 flash_eraseall /dev/$rwfs
309 echo "Restoring saved files to read-write overlay filesystem."
310 touch $trigger
311 $update --no-save-files --clean-saved-files
312 else
313 $update --clean-saved-files
314 fi
315
316 rwfst=$(probe_fs_type $rwdev)
317 fsck=$fsckbase$rwfst
318fi
319
320if grep -w overlay-filesystem-in-ram $optfile
321then
322 rwfst=none
323fi
324
325copyfiles=
326if grep -w copy-files-to-ram $optfile
327then
328 rwfst=none
329 copyfiles=y
330fi
331
332# It would be nice to do this after fsck but that mean rofs is mounted
333# which triggers the mtd is mounted check
334if test "$rwfst$copyfiles" = noney
335then
336 touch $trigger
337 $update --copy-files --clean-saved-files --no-restore-files
338fi
339
340if grep -w copy-base-filesystem-to-ram $optfile &&
341 test ! -e /run/image-rofs && ! cp $rodev /run/image-rofs
342then
343 # Remove any partial copy to avoid attempted usage later
344 if test -e /run/image-rofs
345 then
346 ls -l /run/image-rofs
347 rm -f /run/image-rofs
348 fi
349 debug_takeover "Copying $rodev to /run/image-rofs failed."
350fi
351
352if test -s /run/image-rofs
353then
354 rodev=/run/image-rofs
355 roopts=$roopts,loop
356fi
357
358mount $rodev $rodir -t $rofst -o $roopts
359
360if test -x $rodir$fsck
361then
362 for fs in $fslist
363 do
364 mount --bind $fs $rodir/$fs
365 done
366 chroot $rodir $fsck $fsckopts $rwdev
367 rc=$?
368 for fs in $fslist
369 do
370 umount $rodir/$fs
371 done
372 if test $rc -gt 1
373 then
374 debug_takeover "fsck of read-write fs on $rwdev failed (rc=$rc)"
375 fi
376elif test "$rwfst" != jffs2 -a "$rwfst" != none
377then
378 echo "No '$fsck' in read only fs, skipping fsck."
379fi
380
381if test "$rwfst" = none
382then
383 echo "Running with read-write overlay in RAM for this boot."
384 echo "No state will be preserved unless flash update performed."
385elif ! mount $rwdev $rwdir -t $rwfst -o $rwopts
386then
387 msg="$(cat)" << HERE
388
389Mounting read-write $rwdev filesystem failed. Please fix and run
390 mount $rwdev $rwdir -t $rwfst -o $rwopts
391to to continue, or do change nothing to run from RAM for this boot.
392HERE
393 debug_takeover "$msg"
394fi
395
396rm -rf $work
397mkdir -p $upper $work
398
399mount -t overlay -o lowerdir=$rodir,upperdir=$upper,workdir=$work cow /root
400
401while ! chroot /root /bin/sh -c "test -x '$init' -a -s '$init'"
402do
403 msg="$(cat)" << HERE
404
405Unable to confirm /sbin/init is an executable non-empty file
406in merged file system mounted at /root.
407
408Change Root test failed! Invoking emergency shell.
409HERE
410 debug_takeover "$msg"
411done
412
413for f in $fslist
414do
415 mount --move $f root/$f
416done
417
418# switch_root /root $init
419ln -s /root/dev/mem /dev/mem
420FLASH_CP=`/root/sbin/devmem 0x1e785030`
421FLASH_CP=$(($FLASH_CP&0x02))
422rm /dev/mem
423
424if [ $FLASH_CP == 0 ]; then
425# echo "Flash 1 used. Normal boot.";
426 exec chroot /root $init;
427else
428 exec chroot /root $failsafe;
429fi
430