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Milton D. Miller IId89d5e02016-01-20 14:57:54 -06001#!/bin/sh
2
Milton Miller54d882e2016-02-05 12:07:53 -06003fslist="proc sys dev run"
Milton D. Miller IId89d5e02016-01-20 14:57:54 -06004rodir=run/initramfs/ro
5rwdir=run/initramfs/rw
6upper=$rwdir/cow
7work=$rwdir/work
8
9cd /
Milton Miller54d882e2016-02-05 12:07:53 -060010mkdir -p $fslist
Milton D. Miller IId89d5e02016-01-20 14:57:54 -060011mount 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
Andrew Jefferyacc2c852016-02-23 23:47:23 +103033blkid_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 ${fst:=jffs2}
45}
46
Milton D. Miller IIee30a912016-03-07 17:46:28 -060047# This fw_get_env_var is a possibly broken version of fw_printenv that
48# does not check the crc or flag byte.
Milton D. Miller II04d2aff2016-03-02 15:23:22 -060049# The u-boot environemnt starts with a crc32, followed by a flag byte
50# when a redundannt environment is configured, followed by var=value\0 sets.
51# The flag byte for nand is a 1 byte counter; for nor it is a 1 or 0 byte.
Milton D. Miller II04d2aff2016-03-02 15:23:22 -060052
53get_fw_env_var() {
Milton D. Miller IIee30a912016-03-07 17:46:28 -060054 # do we have 1 or 2 copies of the environment?
55 # count non-blank non-comment lines
56 # copies=$(grep -v ^# /etc/fw_env.config | grep -c [::alnum::])
57 # ... we could if we had the fw_env.config in the initramfs
Edward A. James7bd5f1d2017-08-15 14:18:12 -050058 copies=2
Milton D. Miller IIee30a912016-03-07 17:46:28 -060059
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
Edward A. James4f208442017-07-14 12:32:44 -050067 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
Milton D. Miller II04d2aff2016-03-02 15:23:22 -060075}
76
Milton D. Miller II9be688c2016-03-02 18:28:54 -060077setup_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
Milton Miller06ccb1a2016-02-05 13:04:29 -0600129debug_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
Milton D. Miller IId89d5e02016-01-20 14:57:54 -0600157rofs=$(findmtd rofs)
158rwfs=$(findmtd rwfs)
159
Milton Miller54d882e2016-02-05 12:07:53 -0600160rodev=/dev/mtdblock${rofs#mtd}
161rwdev=/dev/mtdblock${rwfs#mtd}
162
Milton Miller0b0d5fe2016-02-23 21:48:48 -0600163# Set to y for yes, anything else for no.
164force_rwfst_jffs2=y
165flash_images_before_init=n
Milton D. Miller II9be688c2016-03-02 18:28:54 -0600166consider_download_files=y
167consider_download_tftp=y
168consider_download_http=y
169consider_download_ftp=y
Milton Miller0b0d5fe2016-02-23 21:48:48 -0600170
Milton D. Miller IId89d5e02016-01-20 14:57:54 -0600171rofst=squashfs
Andrew Jefferyacc2c852016-02-23 23:47:23 +1030172rwfst=$(probe_fs_type $rwdev)
Milton Miller54d882e2016-02-05 12:07:53 -0600173roopts=ro
174rwopts=rw
175
Milton Miller0b0d5fe2016-02-23 21:48:48 -0600176image=/run/initramfs/image-
177trigger=${image}rwfs
178
Milton Miller54d882e2016-02-05 12:07:53 -0600179init=/sbin/init
Milton Miller0b0d5fe2016-02-23 21:48:48 -0600180fsckbase=/sbin/fsck.
181fsck=$fsckbase$rwfst
Milton Millerb72114c2016-02-06 16:05:06 -0600182fsckopts=-a
Milton D. Miller II1650db52016-02-27 15:48:52 -0600183optfile=/run/initramfs/init-options
Milton Millerad025a82016-05-25 18:52:04 -0500184optbase=/run/initramfs/init-options-base
Milton D. Miller II9be688c2016-03-02 18:28:54 -0600185urlfile=/run/initramfs/init-download-url
Milton D. Miller IIdbc11372016-02-29 11:35:14 -0600186update=/run/initramfs/update
Milton D. Miller II1650db52016-02-27 15:48:52 -0600187
Milton D. Miller IId2977202016-03-07 07:59:09 -0600188if test -e /${optfile##*/}
189then
190 cp /${optfile##*/} $optfile
191fi
192
Milton Millerad025a82016-05-25 18:52:04 -0500193if test -e /${optbase##*/}
194then
195 cp /${optbase##*/} $optbase
196else
197 touch $optbase
198fi
199
Milton D. Miller II1650db52016-02-27 15:48:52 -0600200if test ! -f $optfile
201then
Milton Millerad025a82016-05-25 18:52:04 -0500202 cat /proc/cmdline $optbase > $optfile
Milton D. Miller II04d2aff2016-03-02 15:23:22 -0600203 get_fw_env_var openbmcinit >> $optfile
204 get_fw_env_var openbmconce >> $optfile
Milton D. Miller II1650db52016-02-27 15:48:52 -0600205fi
Milton D. Miller IId89d5e02016-01-20 14:57:54 -0600206
207echo rofs = $rofs $rofst rwfs = $rwfs $rwfst
208
Milton D. Miller II1650db52016-02-27 15:48:52 -0600209if grep -w debug-init-sh $optfile
Milton D. Miller IId89d5e02016-01-20 14:57:54 -0600210then
Milton Miller06ccb1a2016-02-05 13:04:29 -0600211 debug_takeover "Debug initial shell requested by command line."
Milton D. Miller IId89d5e02016-01-20 14:57:54 -0600212fi
213
Milton D. Miller II9be688c2016-03-02 18:28:54 -0600214if test "x$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 "$url"
256 else
257 echo "Download failed."
258 fi
259 else
260 echo "Download failed."
261 fi
262fi
263
Milton D. Miller II1aaffe82016-02-27 17:01:13 -0600264# If there are images in root move them to /run/initramfs/ or /run/ now.
Milton Miller0b0d5fe2016-02-23 21:48:48 -0600265imagebasename=${image##*/}
Milton D. Miller II1aaffe82016-02-27 17:01:13 -0600266if test -n "${imagebasename}" && ls /${imagebasename}* > /dev/null 2>&1
Milton Miller0b0d5fe2016-02-23 21:48:48 -0600267then
Milton D. Miller II1aaffe82016-02-27 17:01:13 -0600268 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
Milton Miller0b0d5fe2016-02-23 21:48:48 -0600276fi
277
Milton D. Miller II1650db52016-02-27 15:48:52 -0600278if grep -w clean-rwfs-filesystem $optfile
Milton Miller0b0d5fe2016-02-23 21:48:48 -0600279then
280 echo "Cleaning of read-write overlay filesystem requested."
281 touch $trigger
282fi
283
Lei YU042b3de2018-07-20 15:11:27 +0800284if grep -w factory-reset $optfile
285then
286 echo "Factory reset requested."
287 touch $trigger
288 do_save=--no-save-files
289else
290 do_save=--save-files
291fi
292
Milton Miller0b0d5fe2016-02-23 21:48:48 -0600293if test "x$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
Milton D. Miller IIdbc11372016-02-29 11:35:14 -0600301 if ! test -x $update
Milton Miller0b0d5fe2016-02-23 21:48:48 -0600302 then
Milton D. Miller IIdbc11372016-02-29 11:35:14 -0600303 debug_takeover "Flash update requested but $update missing!"
Milton Miller0b0d5fe2016-02-23 21:48:48 -0600304 elif test -f $trigger -a ! -s $trigger
305 then
Lei YU042b3de2018-07-20 15:11:27 +0800306 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 $do_save
Milton Miller0b0d5fe2016-02-23 21:48:48 -0600313 echo "Clearing read-write overlay filesystem."
314 flash_eraseall /dev/$rwfs
315 echo "Restoring saved files to read-write overlay filesystem."
316 touch $trigger
Milton D. Miller IIdbc11372016-02-29 11:35:14 -0600317 $update --no-save-files --clean-saved-files
Milton Miller0b0d5fe2016-02-23 21:48:48 -0600318 else
Lei YU042b3de2018-07-20 15:11:27 +0800319 $update --clean-saved-files $do_save
Milton Miller0b0d5fe2016-02-23 21:48:48 -0600320 fi
321
322 rwfst=$(probe_fs_type $rwdev)
323 fsck=$fsckbase$rwfst
324fi
325
Milton D. Miller IIedfd12c2016-02-27 17:31:39 -0600326if grep -w overlay-filesystem-in-ram $optfile
327then
328 rwfst=none
329fi
330
Milton D. Miller II2728b732016-02-29 12:10:34 -0600331copyfiles=
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
Milton D. Miller IIc201b042016-02-27 17:31:39 -0600346if 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 $rodev to /run/image-rofs failed."
356fi
357
Milton D. Miller IIa36e99c2016-02-27 16:04:32 -0600358if test -s /run/image-rofs
359then
360 rodev=/run/image-rofs
361 roopts=$roopts,loop
362fi
363
Milton Millerb72114c2016-02-06 16:05:06 -0600364mount $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
Milton D. Miller II6dba31f2016-02-27 16:38:16 -0600382elif test "$rwfst" != jffs2 -a "$rwfst" != none
Milton Millerf81c1082016-02-23 21:00:06 -0600383then
Milton Millerb72114c2016-02-06 16:05:06 -0600384 echo "No '$fsck' in read only fs, skipping fsck."
385fi
386
Milton D. Miller II6dba31f2016-02-27 16:38:16 -0600387if test "$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 $rwopts
Milton D. Miller IId89d5e02016-01-20 14:57:54 -0600392then
Milton Miller06ccb1a2016-02-05 13:04:29 -0600393 msg="$(cat)" << HERE
394
395Mounting read-write $rwdev filesystem failed. Please fix and run
Andrew Jefferyed5fb272016-02-17 17:19:58 +1030396 mount $rwdev $rwdir -t $rwfst -o $rwopts
Milton Miller06ccb1a2016-02-05 13:04:29 -0600397to to continue, or do change nothing to run from RAM for this boot.
398HERE
399 debug_takeover "$msg"
Milton D. Miller IId89d5e02016-01-20 14:57:54 -0600400fi
401
Milton D. Miller IId89d5e02016-01-20 14:57:54 -0600402rm -rf $work
Milton Millerb72114c2016-02-06 16:05:06 -0600403mkdir -p $upper $work
Milton D. Miller IId89d5e02016-01-20 14:57:54 -0600404
405mount -t overlay -o lowerdir=$rodir,upperdir=$upper,workdir=$work cow /root
406
Milton Miller06ccb1a2016-02-05 13:04:29 -0600407while ! 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
Milton D. Miller IId89d5e02016-01-20 14:57:54 -0600418
Milton Miller54d882e2016-02-05 12:07:53 -0600419for f in $fslist
Milton D. Miller IId89d5e02016-01-20 14:57:54 -0600420do
421 mount --move $f root/$f
422done
423
Milton Miller54d882e2016-02-05 12:07:53 -0600424# switch_root /root $init
425exec chroot /root $init
Milton D. Miller IId89d5e02016-01-20 14:57:54 -0600426