/bin/preseed_command is in ubiquity 18.04.14.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | #!/bin/sh -e
# Run a preseeded command.
ct=$1
. /usr/share/debconf/confmodule
log () {
logger -t preseed "$@"
}
db_get "$ct"
command="$RET"
if [ "$command" != "" ]; then
log "running preseed command $ct: $command"
code=0
log-output sh -c "$command" || code=$?
if [ "$code" != 0 ]; then
db_subst preseed/command_failed COMMAND "$command"
db_subst preseed/command_failed CODE "$code"
db_input critical preseed/command_failed || true
db_go || true
fi
fi
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