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updata_system_update.template.sh
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#! /bin/sh
#
# Perform update, keep state in file system.
#
# Exit codes:
# 0 Done, no errors
# 3 Tried to run this template script directly
# 5 The update plan does not exist
# 6 Status file directory does not exist
# 7 Bad state.
# 10 Update step failed (first try)
# 11 Update step failed (second try)
# 12 Update not attempted again due to previous multiple failures (most
# probably a recovery is needed)
# 20 Reboot step failed for some reason
# 21 Reboot step failed because the reboot request failed
#
# State files (maintained in @STAMP_DIR@) are documented in states.md, the
# associated states are documented in states.dot.
#
test "x@ALLOW_EXECUTION@" = "xyes" || exit 3
THE_PLAN="@THE_PLAN@"
STAMP_DIR="@STAMP_DIR@"
EXEC_ARGS=
test -f "${THE_PLAN}" || exit 5
test -d "${STAMP_DIR}" || exit 6
UPDATE_FINISHED="${STAMP_DIR}/update_finished"
UPDATE_BEGIN="${STAMP_DIR}/update_started"
UPDATE_DONE="${STAMP_DIR}/update_done"
UPDATE_FAIL="${STAMP_DIR}/update_failure"
UPDATE_FAIL_AGAIN="${STAMP_DIR}/update_failure_again"
UPDATE_EXIT_CODE="${STAMP_DIR}/update_exit_code"
REBOOT_BEGIN="${STAMP_DIR}/update_reboot_started"
REBOOT_STATUS="${STAMP_DIR}/update_reboot_stderr"
REBOOT_FAIL="${STAMP_DIR}/update_reboot_failed"
REBOOT_EXIT_CODE="${STAMP_DIR}/update_reboot_exit_code"
SYSUPDATE_SYMLINK='/system-update'
test -f "${UPDATE_FINISHED}" && exit 0
# determine state and clean up stamp files (just in case)
if test ! -f "${UPDATE_BEGIN}"
then
STATE='init'
rm -f "${UPDATE_BEGIN}" "${UPDATE_DONE}" "${UPDATE_FAIL}" \
"${UPDATE_FAIL_AGAIN}" "${REBOOT_BEGIN}" "${REBOOT_STATUS}" \
"${REBOOT_FAIL}"
elif test -f "${UPDATE_DONE}"
then
rm -f "${UPDATE_FAIL}" "${UPDATE_FAIL_AGAIN}"
if test ! -f "${REBOOT_BEGIN}"
then
STATE='US'
rm -f "${REBOOT_STATUS}" "${REBOOT_FAIL}"
elif test ! -f "${REBOOT_STATUS}"
then
STATE='UR'
rm -f "${REBOOT_FAIL}"
elif test -f "${REBOOT_FAIL}"
then
STATE='URF'
else
# this is actually UR2, but at startup it is C
STATE='C'
fi
elif test -f "${UPDATE_FAIL}"
then
if test -f "${UPDATE_FAIL_AGAIN}"
then
STATE='RF'
rm -f "${REBOOT_BEGIN}" "${REBOOT_STATUS}" "${REBOOT_FAIL}"
elif test ! -f "${REBOOT_BEGIN}"
then
STATE='UF'
rm -f "${REBOOT_STATUS}" "${REBOOT_FAIL}"
elif test ! -f "${REBOOT_STATUS}"
then
STATE='FR'
rm -f "${REBOOT_FAIL}"
elif test -f "${REBOOT_FAIL}"
then
STATE='FRF'
else
# this is actually FR2, but at startup it is R2
STATE='R2'
fi
elif test -e "${SYSUPDATE_SYMLINK}"
then
STATE='R1'
else
STATE='U'
rm -f "${UPDATE_FAIL_AGAIN}" "${REBOOT_BEGIN}" "${REBOOT_STATUS}" \
"${REBOOT_FAIL}"
fi
IS_FIRST_STATE=1
# process state machine
while true
do
logger "State is ${STATE}"
case $STATE
in
init)
STATE='U'
touch "${UPDATE_BEGIN}"
;;
U)
logger 'Starting update'
rm -f "${UPDATE_EXIT_CODE}"
updata_execute.py ${EXEC_ARGS} --avoid-reboot -p "${THE_PLAN}" 2>"${UPDATE_FAIL}"
RET=$?
if test ${RET} -eq 0
then
rm -f "${UPDATE_FAIL}"
if test -e "${SYSUPDATE_SYMLINK}"
then
STATE='OR'
else
STATE='US'
touch "${UPDATE_DONE}"
fi
else
STATE='UF'
echo "${RET}" >"${UPDATE_EXIT_CODE}"
fi
;;
OR)
logger 'Rebooting for offline update'
sudo /bin/systemctl isolate reboot.target
exit 0
;;
R1)
logger 'Starting offline update'
rm -f "${UPDATE_EXIT_CODE}"
updata_execute.py ${EXEC_ARGS} --avoid-reboot -p "${THE_PLAN}" 2>"${UPDATE_FAIL}"
RET=$?
if test ${RET} -eq 0
then
STATE='US'
rm -f "${UPDATE_FAIL}"
touch "${UPDATE_DONE}"
else
STATE='UF'
echo "${RET}" >"${UPDATE_EXIT_CODE}"
fi
;;
R2)
logger 'Resuming update'
rm -f "${UPDATE_FAIL}" "${REBOOT_BEGIN}" "${REBOOT_STATUS}" \
"${UPDATE_EXIT_CODE}"
updata_execute.py ${EXEC_ARGS} --avoid-reboot -p "${THE_PLAN}" 2>"${UPDATE_FAIL}"
RET=$?
if test ${RET} -eq 0
then
STATE='US'
rm -f "${UPDATE_FAIL}" "${UPDATE_FAIL_AGAIN}"
touch "${UPDATE_DONE}"
else
STATE='RF'
echo "${RET}" >"${UPDATE_EXIT_CODE}"
touch "${UPDATE_FAIL_AGAIN}"
fi
;;
US)
STATE='UR'
touch "${REBOOT_BEGIN}"
;;
UR)
rm -f "${REBOOT_EXIT_CODE}"
updata_execute.py ${EXEC_ARGS} --reboot-only -p "${THE_PLAN}" 2>"${REBOOT_STATUS}"
RET=$?
if test ${RET} -eq 0
then
STATE='UR2'
else
# failed to reboot
STATE='URF'
touch "${REBOOT_FAIL}"
echo "${RET}" >"${REBOOT_EXIT_CODE}"
fi
;;
UR2)
logger 'Rebooting for completion'
exit 0
;;
C)
logger 'Update finished'
touch "${UPDATE_FINISHED}"
exit 0
;;
URF)
if test -f "${REBOOT_EXIT_CODE}"
then
read -r RET <"${REBOOT_EXIT_CODE}"
test -n "${RET}" || RET=10
else
RET=10
fi
if test -s "${REBOOT_STATUS}"
then
logger <"${REBOOT_STATUS}"
else
logger "Failed executing reboot step: exit code ${RET}, no error messages"
fi
test ${RET} -eq 10 || exit 20
exit 21
;;
UF)
if test -f "${UPDATE_EXIT_CODE}"
then
read -r RET <"${UPDATE_EXIT_CODE}"
test -n "${RET}" || RET='empty'
else
RET='unknown'
fi
if test -s "${UPDATE_FAIL}"
then
logger <"${UPDATE_FAIL}"
else
logger "Failed update plan execution: exit code ${RET}, no error messages"
fi
STATE='FR'
touch "${REBOOT_BEGIN}"
;;
RF)
if test -f "${UPDATE_EXIT_CODE}"
then
read -r RET <"${UPDATE_EXIT_CODE}"
test -n "${RET}" || RET='empty'
else
RET='unknown'
fi
if test -s "${UPDATE_FAIL}"
then
logger <"${UPDATE_FAIL}"
else
logger "Failed update plan execution: exit code ${RET}, no error messages"
fi
logger "Failed AGAIN, giving up"
test ${IS_FIRST_STATE} -ne 0 || exit 11
exit 12
;;
FR)
rm -f "${REBOOT_EXIT_CODE}"
updata_execute.py ${EXEC_ARGS} --reboot-only -p "${THE_PLAN}" 2>"${REBOOT_STATUS}"
RET=$?
if test ${RET} -eq 0
then
STATE='FR2'
else
# failed to reboot
STATE='FRF'
touch "${REBOOT_FAIL}"
echo "${RET}" >"${REBOOT_EXIT_CODE}"
fi
;;
FR2)
test ${IS_FIRST_STATE} -ne 0 || logger 'Rebooting to resume after error'
exit 0
;;
FRF)
if test -f "${REBOOT_EXIT_CODE}"
then
read -r RET <"${REBOOT_EXIT_CODE}"
test -n "${RET}" || RET=10
else
RET=10
fi
if test -s "${REBOOT_STATUS}"
then
logger <"${REBOOT_STATUS}"
else
logger "Failed executing reboot step: exit code ${RET}, no error messages"
fi
test ${RET} -eq 10 || exit 20
exit 21
;;
*)
logger "BAD STATE \"${STATE}"\"
exit 7
;;
esac
IS_FIRST_STATE=0
done