From 4cb803cffa7cd6243844b28ef0728ca9da8b3022 Mon Sep 17 00:00:00 2001
From: pvincent <pvincent@artcode.re>
Date: Sat, 11 Jul 2026 17:50:58 +0400
Subject: [PATCH] tee >/dev/null

---
 bin/bash-back    | 13 ++-----------
 lib/utility.bash | 10 +++++-----
 useless.sh       |  4 +++-
 3 files changed, 10 insertions(+), 17 deletions(-)

diff --git a/bin/bash-back b/bin/bash-back
index dc1f996..2735233 100755
--- a/bin/bash-back
+++ b/bin/bash-back
@@ -1,8 +1,8 @@
 #!/usr/bin/env bash
 
 # CONSTANTS
-DEBUG=${BASH_BACK_DEBUG:-false}
 TMP_ERROR=$(mktemp -t "$(basename $0).XXXXXXXX" --tmpdir=/run/user/$(id -u))
+DEBUG=${BASH_BACK_DEBUG:-false}
 SCRIPT=$1
 
 # FUNCTIONS
@@ -78,15 +78,6 @@ function on_exit {
         stack_summary+=("ERROR $code: [$message]")
       fi
     else
-      # FIXME: should either
-      # 1. grab the whole stacktrace, then print back again
-      # 2. or FLUSH previous stderr
-      # because previous stderr might disappear from the first script when calling subprocess!
-      #
-      # ```bash
-      # >&2 echo some trace in stderr
-      # lib/utility.bash # which contains error
-      # ```
       regex="^	.*:[0-9]*	.*\$"
       [[ "$last_error" =~ $regex ]] || stack_summary+=("ERROR $code:") # <undefined>
     fi
@@ -145,7 +136,7 @@ trap 'on_exit $?' ERR TERM INT EXIT
 trap 'on_return' DEBUG
 
 # magic FD
-exec 3>$TMP_ERROR 4>/dev/stderr
+exec 3> >(tee $TMP_ERROR >/dev/null) 4>/dev/stderr
 $DEBUG && >/dev/tty echo '---stdout---'
 source $SCRIPT 2>&3
 success
diff --git a/lib/utility.bash b/lib/utility.bash
index 2dc7102..c583fa5 100755
--- a/lib/utility.bash
+++ b/lib/utility.bash
@@ -3,17 +3,17 @@
 
 function blabla {
   echo IN blabla OUT
+  >&2 echo stderr from utility
   suite
-  echo $?
 }
 
 function suite {
+  return 7
+  exit 10 # youpi
   echo $nope
-  return
-  exit
   command_not_found
-  exit 10 # youpi
-  return 7
+  exit
+  return
 }
 
 blabla
diff --git a/useless.sh b/useless.sh
index 67eda1b..e8dffa5 100755
--- a/useless.sh
+++ b/useless.sh
@@ -31,8 +31,10 @@ function F3 {
 
 echo start of useless
 F3
->&2 echo some trace in stderr
+>&2 echo some trace in stderr1
 lib/utility.bash
+>&2 echo some trace in stderr2
+
 . lib/utility.bash
 
 main