| Current File : //usr/local/jetapps/usr/share/rear/layout/prepare/Linux-s390/400_run_dasd_format_code.sh |
# adapted from 200_run_layout_code.sh
#
# Run the DASD format code (dasdformat.sh)
# again and again until it succeeds or the user aborts.
#
# Skip DASD formatting when the user has explicitly specified to not format them
# or when the user selected "Confirm what is currently on the DASDs, skip formatting them"
# in 370_confirm_dasd_format_code.sh
is_false "$FORMAT_DASDS" && return 0
function lsdasd_output () {
lsdasd 1>> >( tee -a "$RUNTIME_LOGFILE" 1>&7 )
}
rear_workflow="rear $WORKFLOW"
original_disk_space_usage_file="$VAR_DIR/layout/config/df.txt"
rear_shell_history="$( echo -e "cd $VAR_DIR/layout/\nvi $DASD_FORMAT_CODE\nless $RUNTIME_LOGFILE" )"
wilful_input=""
unset choices
choices[0]="Rerun DASD format script ($DASD_FORMAT_CODE)"
choices[1]="View '$rear_workflow' log file ($RUNTIME_LOGFILE)"
choices[2]="Edit DASD format script ($DASD_FORMAT_CODE)"
choices[3]="Show what is currently on the disks ('lsdasd' device list)"
choices[4]="View original disk space usage ($original_disk_space_usage_file)"
choices[5]="Use Relax-and-Recover shell and return back to here"
choices[6]="Confirm what is currently on the disks and continue '$rear_workflow'"
choices[7]="Abort '$rear_workflow'"
prompt="DASD format choices"
choice=""
# When USER_INPUT_DASD_FORMAT_CODE_RUN has any 'true' value be liberal in what you accept and
# assume choices[0] 'Rerun DASD format script' was actually meant
# regardless that this likely lets 'rear recover' run an endless loop
# of failed DASD format attempts but ReaR must obey what the user specified
# (perhaps it is intended to let 'rear recover' loop here until an admin intervenes):
is_true "$USER_INPUT_DASD_FORMAT_CODE_RUN" && USER_INPUT_DASD_FORMAT_CODE_RUN="${choices[0]}"
unset confirm_choices
confirm_choices[0]="Confirm recreated DASD format and continue '$rear_workflow'"
confirm_choices[1]="Go back one step to redo DASD format"
confirm_choices[2]="Use Relax-and-Recover shell and return back to here"
confirm_choices[3]="Abort '$rear_workflow'"
confirm_prompt="Confirm the recreated DASD format or go back one step"
confirm_choice=""
# When USER_INPUT_DASD_FORMAT_MIGRATED_CONFIRMATION has any 'true' value be liberal in what you accept and
# assume confirm_choices[0] 'Confirm recreated DASD format and continue' was actually meant:
is_true "$USER_INPUT_DASD_FORMAT_MIGRATED_CONFIRMATION" && USER_INPUT_DASD_FORMAT_MIGRATED_CONFIRMATION="${confirm_choices[0]}"
# Run the DASD format code (dasdformat.sh)
# again and again until it succeeds or the user aborts
# or the user confirms to continue with what is currently on the disks
# (the user may have setup manually what he needs via the Relax-and-Recover shell):
while true ; do
prompt="The DASD format had failed"
# After switching to recreating with DASD format script
# change choices[0] from "Run ..." to "Rerun ...":
choices[0]="Rerun DASD format script ($DASD_FORMAT_CODE)"
# Run DASD_FORMAT_CODE in a sub-shell because it sets 'set -e'
# so that it exits the running shell in case of an error
# but that exit must not exit this running bash here:
( source $DASD_FORMAT_CODE )
# One must explicitly test whether or not $? is zero in a separated bash command
# because with bash 3.x and bash 4.x code like
# # ( set -e ; cat qqq ; echo "hello" ) && echo ok || echo failed
# cat: qqq: No such file or directory
# hello
# ok
# does not work as one may expect (cf. what "man bash" describes for 'set -e').
# There is a subtle behavioural difference between bash 3.x and bash 4.x
# when a script that has 'set -e' set gets sourced:
# With bash 3.x the 'set -e' inside the sourced script is effective:
# # echo 'set -e ; cat qqq ; echo hello' >script.sh
# # ( source script.sh ) && echo ok || echo failed
# cat: qqq: No such file or directory
# failed
# With bash 4.x the 'set -e' inside the sourced script gets noneffective:
# # echo 'set -e ; cat qqq ; echo hello' >script.sh
# # ( source script.sh ) && echo ok || echo failed
# cat: qqq: No such file or directory
# hello
# ok
# With bash 3.x and bash 4.x testing $? in a separated bash command
# keeps the 'set -e' inside the sourced script effective:
# # echo 'set -e ; cat qqq ; echo hello' >script.sh
# # ( source script.sh ) ; (( $? == 0 )) && echo ok || echo failed
# cat: qqq: No such file or directory
# failed
# See also https://github.com/rear/rear/pull/1573#issuecomment-344303590
if (( $? == 0 )) ; then
prompt="DASD format had been successful"
# When DASD_FORMAT_CODE succeeded and when not in migration mode
# break the outer while loop and continue the "rear recover" workflow
# which means continue with restoring the backup:
is_true "$MIGRATION_MODE" || break
# When DASD_FORMAT_CODE succeeded in migration mode
# let the user explicitly confirm the recreated (and usually migrated) format
# before continuing the "rear recover" workflow with restoring the backup.
# Show the recreated DASD format to the user on his terminal (and also in the log file):
LogPrint "Recreated DASD format:"
lsdasd_output
# Run an inner while loop with a user dialog so that the user can inspect the recreated DASD format
# and perhaps even manually fix the recreated DASD format if it is not what the user wants
# (e.g. by using the Relax-and-Recover shell and returning back to this user dialog):
while true ; do
confirm_choice="$( UserInput -I DASD_FORMAT_MIGRATED_CONFIRMATION -p "$confirm_prompt" -D "${confirm_choices[0]}" "${confirm_choices[@]}" )" && wilful_input="yes" || wilful_input="no"
case "$confirm_choice" in
(${confirm_choices[0]})
# Confirm recreated DASD format and continue:
is_true "$wilful_input" && LogPrint "User confirmed recreated DASD format" || LogPrint "Continuing with recreated DASD format by default"
# Break the outer while loop and continue with restoring the backup:
break 2
;;
(${confirm_choices[1]})
# Go back one step to redo DASD format:
# Only break the inner while loop (i.e. this user dialog loop)
# and continue with the next user dialog below:
break
;;
(${confirm_choices[2]})
# rear_shell runs 'bash' with the original STDIN STDOUT and STDERR when 'rear' was launched by the user:
rear_shell "" "$rear_shell_history"
;;
(${confirm_choices[3]})
abort_dasd_format
Error "User did not confirm the recreated DASD format but aborted '$rear_workflow' in ${BASH_SOURCE[0]}"
;;
esac
done
fi
# Run an inner while loop with a user dialog so that the user can fix things
# when DASD_FORMAT_CODE failed.
# Such a fix does not necessarily mean the user must change
# the dasdformat.sh script when DASD_FORMAT_CODE failed.
# The user might also fix things by only using the Relax-and-Recover shell and
# then confirm what is on the disks and continue with restoring the backup
# or abort this "rear recover" run to re-try from scratch.
while true ; do
choice="$( UserInput -I DASD_FORMAT_CODE_RUN -p "$prompt" -D "${choices[0]}" "${choices[@]}" )" && wilful_input="yes" || wilful_input="no"
case "$choice" in
(${choices[0]})
# Rerun or run (after switching to recreating with DASD format script) DASD format script:
is_true "$wilful_input" && LogPrint "User runs DASD format script" || LogPrint "Running DASD format script by default"
# Only break the inner while loop (i.e. the user dialog loop):
break
;;
(${choices[1]})
# Run 'less' with the original STDIN STDOUT and STDERR when 'rear' was launched by the user:
less $RUNTIME_LOGFILE 0<&6 1>&7 2>&8
;;
(${choices[2]})
# Run 'vi' with the original STDIN STDOUT and STDERR when 'rear' was launched by the user:
vi $DASD_FORMAT_CODE 0<&6 1>&7 2>&8
;;
(${choices[3]})
LogPrint "This is the current list of DASDs:"
lsdasd_output
;;
(${choices[4]})
# Run 'less' with the original STDIN STDOUT and STDERR when 'rear' was launched by the user:
less $original_disk_space_usage_file 0<&6 1>&7 2>&8
;;
(${choices[5]})
# rear_shell runs 'bash' with the original STDIN STDOUT and STDERR when 'rear' was launched by the user:
rear_shell "" "$rear_shell_history"
;;
(${choices[6]})
# Confirm what is on the disks and continue:
# Break the outer while loop and continue with restoring the backup:
break 2
;;
(${choices[7]})
abort_dasd_format
Error "User chose to abort '$rear_workflow' in ${BASH_SOURCE[0]}"
;;
esac
done
# End of the outer while loop:
done
# Local functions must be 'unset' because bash does not support 'local function ...'
# cf. https://unix.stackexchange.com/questions/104755/how-can-i-create-a-local-function-in-my-bashrc
unset -f lsdasd_output