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https://github.com/docker-mailserver/docker-mailserver
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106 lines
3.8 KiB
Bash
106 lines
3.8 KiB
Bash
#!/bin/bash
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function _exit_with_error() {
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if [[ -n ${1+set} ]]; then
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_log 'error' "${1}"
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else
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_log 'error' "Call to '_exit_with_error' is missing a message to log"
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fi
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_log 'error' 'Aborting'
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exit "${2:-1}"
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}
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# `dms_panic` methods are appropriate when the type of error is a not recoverable,
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# or needs to be very clear to the user about misconfiguration.
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#
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# Method is called with args:
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# PANIC_TYPE => (Internal value for matching). You should use the convenience methods below based on your panic type.
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# PANIC_INFO => Provide your own message string to insert into the error message for that PANIC_TYPE.
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# PANIC_SCOPE => Optionally provide a string for debugging to better identify/locate the source of the panic.
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function dms_panic() {
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local PANIC_TYPE=${1:-}
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local PANIC_INFO=${2:-}
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local PANIC_SCOPE=${3:-}
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local SHUTDOWN_MESSAGE
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case "${PANIC_TYPE:-}" in
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( 'fail-init' ) # PANIC_INFO == <name of service or process that failed to start / initialize>
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SHUTDOWN_MESSAGE="Failed to start ${PANIC_INFO}!"
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;;
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( 'no-env' ) # PANIC_INFO == <ENV VAR name>
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SHUTDOWN_MESSAGE="Environment Variable: ${PANIC_INFO} is not set!"
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;;
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( 'no-file' ) # PANIC_INFO == <invalid filepath>
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SHUTDOWN_MESSAGE="File ${PANIC_INFO} does not exist!"
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;;
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( 'misconfigured' ) # PANIC_INFO == <something possibly misconfigured, eg an ENV var>
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SHUTDOWN_MESSAGE="${PANIC_INFO} appears to be misconfigured, please verify."
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;;
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( 'invalid-value' ) # PANIC_INFO == <an unsupported or invalid value, eg in a case match>
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SHUTDOWN_MESSAGE="Invalid value for ${PANIC_INFO}!"
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;;
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( 'general' )
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SHUTDOWN_MESSAGE=${PANIC_INFO}
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;;
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( * ) # `dms_panic` was called directly without a valid PANIC_TYPE
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SHUTDOWN_MESSAGE='Something broke :('
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;;
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esac
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if [[ -n ${PANIC_SCOPE:-} ]]; then
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_shutdown "${PANIC_SCOPE} | ${SHUTDOWN_MESSAGE}"
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else
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_shutdown "${SHUTDOWN_MESSAGE}"
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fi
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}
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# Convenience wrappers based on type:
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function _dms_panic__fail_init { dms_panic 'fail-init' "${1:-}" "${2:-}" "${3:-}" ; }
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function _dms_panic__no_env { dms_panic 'no-env' "${1:-}" "${2:-}" "${3:-}" ; }
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function _dms_panic__no_file { dms_panic 'no-file' "${1:-}" "${2:-}" "${3:-}" ; }
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function _dms_panic__misconfigured { dms_panic 'misconfigured' "${1:-}" "${2:-}" "${3:-}" ; }
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function _dms_panic__invalid_value { dms_panic 'invalid-value' "${1:-}" "${2:-}" "${3:-}" ; }
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function _dms_panic__general { dms_panic 'general' "${1:-}" "${2:-}" "${3:-}" ; }
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# Call this method when you want to panic (i.e. emit an 'ERROR' log, and exit uncleanly).
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# `dms_panic` methods should be preferred if your failure type is supported.
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trap "exit 1" SIGUSR1
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SCRIPT_PID=${$}
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function _shutdown() {
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_log 'error' "${1:-_shutdown called without message}"
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_log 'error' 'Shutting down'
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sleep 1
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kill -SIGTERM 1 # Trigger graceful DMS shutdown.
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kill -SIGUSR1 "${SCRIPT_PID}" # Stop start-mailserver.sh execution, even when _shutdown() is called from a subshell.
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}
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# Calling this function sets up a handler for the `ERR` signal, that occurs when
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# an error is not properly checked (e.g., in an `if`-clause or in an `&&` block).
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#
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# This is mostly useful for debugging. It also helps when using something like `set -eE`,
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# as it shows where the script aborts.
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function _trap_err_signal() {
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trap '__log_unexpected_error "${FUNCNAME[0]:-}" "${BASH_COMMAND:-}" "${LINENO:-}" "${?:-}"' ERR
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# shellcheck disable=SC2317
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function __log_unexpected_error() {
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local MESSAGE="Unexpected error occured :: script = ${SCRIPT:-${0}} "
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MESSAGE+=" | function = ${1:-none (global)}"
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MESSAGE+=" | command = ${2:-?}"
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MESSAGE+=" | line = ${3:-?}"
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MESSAGE+=" | exit code = ${4:-?}"
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_log 'error' "${MESSAGE}"
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return 0
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}
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}
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