robustness and satisfy shellcheck

[distro-setup] / switch-mail-host

diff --git a/switch-mail-host b/switch-mail-host
index e52abdb45326c9617697e591e7f5d9b3e62d1a9e..10fcd9f12d82c580e1ee3536c2ac51ed08e9c969 100644 (file)
--- a/switch-mail-host
+++ b/switch-mail-host
@@ -1,50 +1,6 @@
 #!/bin/bash
 
-err-bash-trace() {
-  local -i argc_index=0 frame i start=${1:-0} max_indent=8 indent
-  local source
-  local extdebug=false
-  if [[ $(shopt -p extdebug) == *-s* ]]; then
-    extdebug=true
-  fi
-  for ((frame=0; frame < ${#FUNCNAME[@]}-1; frame++)); do
-    argc=${BASH_ARGC[frame]}
-    argc_index+=$argc
-    ((frame < start)) && continue
-    if (( ${#BASH_SOURCE[@]} > 1 )); then
-      source="${BASH_SOURCE[frame+1]}:${BASH_LINENO[frame]}:"
-    fi
-    indent=$((frame-start + 1))
-    indent=$((indent < max_indent ? indent : max_indent))
-    printf "%${indent}s↳%sin \`%s" '' "$source" "${FUNCNAME[frame]}"
-    if $extdebug; then
-      for ((i=argc_index-1; i >= argc_index-argc; i--)); do
-        printf " %s" "${BASH_ARGV[i]}"
-      done
-    fi
-    echo \'
-  done
-  return 0
-}
-
-
-err-catch() {
-  set -E; shopt -s extdebug
-  _err-trap() {
-    err=$?
-    exec >&2
-    set +x
-    echo "${BASH_SOURCE[1]}:${BASH_LINENO[0]}: \`$BASH_COMMAND' returned $err"
-    err-bash-trace 2
-    set -e # err trap does not work within an error trap
-    "${_errcatch_cleanup[@]:-:}" # note :-: is to be compatible with set -u
-    echo "$0: exiting with code $err"
-    exit $err
-  }
-  trap _err-trap ERR
-  set -o pipefail
-}
-err-catch
+source /usr/local/lib/err
 
 usage() {
   cat <<EOF
@@ -76,7 +32,7 @@ cleanup() {
     $old_shell sudo systemctl start btrbk.timer
   fi
 }
-_errcatch_cleanup=cleanup
+_errcatch_cleanup=cleanup # used by sourced err
 
 pre="${0##*/}:"
 m() { printf "$pre %s\n"  "$*"; "$@"; }