It works

apt-repo-updater.sh

@@ -0,0 +1,75 @@
+#!/usr/bin/env bash
+
+WORK_DIR=${WORK_DIR:?"WORK_DIR is not set!!"}
+INCOME_DIR=${INCOME_DIR:="${WORK_DIR}/income"}
+CODENAME=(bookworm)
+
+set -o functrace
+set -o nounset
+set -o errtrace
+set -o errexit
+
+function msg {
+    local mesg="$1"; shift
+    printf "====> ${mesg}\n" "$@"
+}
+
+function term_handle {
+    if [[ -n "$inotify_pid" ]]
+    then
+        GO_ON=0
+        msg "sending TERM to inotifywait..."
+        kill -s TERM "$inotify_pid" 2>/dev/null || true
+    fi
+}
+function term_delay  {
+    GO_ON=0
+    msg "building repo, will terminate later"
+}
+trap 'term_handle' TERM SIGINT INT
+
+
+function build_repo {
+    trap 'term_delay' TERM SIGINT INT
+
+    for deb in "${INCOME_DIR}/"*
+    do
+        if [[ "$deb" = *"/*" ]]
+        then
+            msg "no file in $INCOME_DIR, skip this build"
+            break
+        fi
+
+        msg "start adding $deb"
+        for codename in "${CODENAME[@]}"
+        do
+            msg "adding $deb into $codename"
+            reprepro includedeb "$codename" "$deb"
+        done
+        msg "finished adding $deb"
+
+        msg "removing $deb from income dir $INCOME_DIR"
+        rm $deb
+    done
+
+    trap 'term_handle' TERM SIGINT INT
+}
+
+cd "$WORK_DIR"
+
+GO_ON=1             # flag of if continue the loop
+PROGRAM_NAME="$0"
+while [[ "$GO_ON" = "1" ]]
+do
+    build_repo
+
+    msg "start watching $INCOME_DIR"
+    inotifywait --quiet -e move -e modify -e create "$INCOME_DIR" &
+    inotify_pid="$!"
+
+    # when inotifywait was killed, its return code is no-zero,
+    # so when wait return inotifywait's return code, script will exit due to errexit
+    wait || true
+done
+
+msg "$PROGRAM_NAME shutdown"