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#!/bin/sh
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. /usr/share/libubox/jshn.sh
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BASE_DIR="/tmp/luci-app-run"
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UPLOAD_DIR="$BASE_DIR/uploads"
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RUN_DIR="$BASE_DIR/runs"
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STATE_FILE="$BASE_DIR/state"
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MAX_SIZE=$((256 * 1024 * 1024))
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umask 077
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mkdir -p "$UPLOAD_DIR" "$RUN_DIR"
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reply() {
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printf '%s\n' "$1"
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}
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json_error() {
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local msg="$1"
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json_init
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json_add_int code 1
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json_add_string error "$msg"
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json_dump
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}
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json_ok() {
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json_init
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json_add_int code 0
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[ -n "$1" ] && json_add_string message "$1"
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json_dump
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}
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sanitize_name() {
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local name="$1"
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name="${name##*/}"
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name="${name##*\\}"
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printf '%s' "$name" | tr -c 'A-Za-z0-9._-' '_'
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}
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valid_id() {
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case "$1" in
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""|*[!A-Za-z0-9_-]*) return 1 ;;
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esac
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return 0
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}
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load_input() {
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local input
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input="$(cat)"
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json_load "$input" >/dev/null 2>&1
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}
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get_string() {
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json_get_var "$1" "$1"
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}
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get_int() {
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json_get_var "$1" "$1"
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}
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new_token() {
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local token
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token="$(hexdump -n 16 -e '16/1 "%02x"' /dev/urandom 2>/dev/null)"
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[ -n "$token" ] || token="$(date +%s)_$$_$(awk 'BEGIN{srand();print int(rand()*1000000)}')"
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printf '%s' "$token" | tr -c 'A-Za-z0-9_' '_'
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}
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session_dir() {
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printf '%s/%s' "$UPLOAD_DIR" "$1"
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}
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write_state() {
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local pid="$1"
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local file="$2"
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local log="$3"
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local started="$4"
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{
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printf 'PID=%s\n' "$pid"
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printf 'FILE=%s\n' "$file"
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printf 'LOG=%s\n' "$log"
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printf 'STARTED=%s\n' "$started"
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} > "$STATE_FILE"
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}
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read_state() {
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[ -f "$STATE_FILE" ] && . "$STATE_FILE"
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}
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is_running() {
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local pid="$1"
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[ -n "$pid" ] && [ -d "/proc/$pid" ]
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}
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method_list() {
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cat <<'JSON'
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{
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"upload_start": {
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"filename": "String",
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"size": "Integer"
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},
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"upload_chunk": {
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"id": "String",
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"data": "String",
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"index": "Integer"
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},
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"upload_finish": {
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"id": "String"
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},
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"run": {
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"id": "String"
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},
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"status": {},
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"read_log": {
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"offset": "Integer"
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},
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"cleanup": {}
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}
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JSON
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}
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upload_start() {
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load_input
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get_string filename
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get_int size
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[ -n "$filename" ] || { json_error "Missing filename"; return; }
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[ -n "$size" ] || size=0
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[ "$size" -le "$MAX_SIZE" ] 2>/dev/null || { json_error "File is larger than 256 MiB"; return; }
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local clean id token dir file
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clean="$(sanitize_name "$filename")"
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case "$clean" in
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*.run) ;;
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*) json_error "Only .run files are accepted"; return ;;
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esac
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id="$(date +%s)_$$"
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token="$(new_token)"
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dir="$(session_dir "$id")"
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file="$dir/$clean"
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mkdir -p "$dir" || { json_error "Unable to create upload directory"; return; }
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: > "$file" || { json_error "Unable to create upload file"; return; }
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printf '%s\n' "$clean" > "$dir/name"
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printf '%s\n' "$size" > "$dir/size"
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printf '%s\n' "$token" > "$dir/token"
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json_init
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json_add_int code 0
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json_add_string id "$id"
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json_add_string token "$token"
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json_add_string filename "$clean"
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json_dump
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}
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upload_chunk() {
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load_input
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get_string id
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get_string data
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get_int index
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valid_id "$id" || { json_error "Invalid upload id"; return; }
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[ -n "$data" ] || { json_error "Missing chunk data"; return; }
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local dir name file
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dir="$(session_dir "$id")"
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[ -d "$dir" ] || { json_error "Unknown upload id"; return; }
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name="$(cat "$dir/name" 2>/dev/null)"
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file="$dir/$name"
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printf '%s' "$data" | base64 -d >> "$file" 2>/dev/null || {
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json_error "Unable to decode upload chunk"
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return
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}
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json_init
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json_add_int code 0
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json_add_int index "$index"
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json_add_int received "$(wc -c < "$file" 2>/dev/null)"
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json_dump
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}
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upload_finish() {
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load_input
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get_string id
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valid_id "$id" || { json_error "Invalid upload id"; return; }
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local dir name file expected actual
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dir="$(session_dir "$id")"
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[ -d "$dir" ] || { json_error "Unknown upload id"; return; }
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name="$(cat "$dir/name" 2>/dev/null)"
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expected="$(cat "$dir/size" 2>/dev/null)"
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file="$dir/$name"
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actual="$(wc -c < "$file" 2>/dev/null)"
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[ -s "$file" ] || { json_error "Uploaded file is empty"; return; }
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if [ -n "$expected" ] && [ "$expected" -gt 0 ] 2>/dev/null; then
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[ "$actual" -eq "$expected" ] 2>/dev/null || {
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json_error "Upload size mismatch"
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return
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}
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fi
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chmod 700 "$file" || { json_error "Unable to chmod uploaded file"; return; }
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json_init
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json_add_int code 0
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json_add_string id "$id"
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json_add_string filename "$name"
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json_add_int size "$actual"
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json_dump
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}
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run_installer() {
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load_input
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get_string id
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valid_id "$id" || { json_error "Invalid upload id"; return; }
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local dir name file log work pid now
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dir="$(session_dir "$id")"
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[ -d "$dir" ] || { json_error "Unknown upload id"; return; }
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name="$(cat "$dir/name" 2>/dev/null)"
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file="$dir/$name"
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[ -x "$file" ] || { json_error "Uploaded file is not executable"; return; }
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read_state
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if is_running "$PID"; then
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json_error "Another installer is already running"
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return
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fi
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now="$(date '+%Y-%m-%d %H:%M:%S')"
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work="$RUN_DIR/$id"
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log="$work/output.log"
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mkdir -p "$work" || { json_error "Unable to create run directory"; return; }
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(
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cd "$work" || exit 1
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printf 'luci-app-run: started %s\n' "$now"
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printf 'luci-app-run: executing %s\n\n' "$file"
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"$file"
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rc=$?
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printf '\nluci-app-run: exited with status %s at %s\n' "$rc" "$(date '+%Y-%m-%d %H:%M:%S')"
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exit "$rc"
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) > "$log" 2>&1 &
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pid="$!"
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write_state "$pid" "$file" "$log" "$now"
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json_init
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json_add_int code 0
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json_add_int pid "$pid"
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json_add_string log "$log"
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json_dump
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}
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status() {
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read_state
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json_init
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json_add_int code 0
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if is_running "$PID"; then
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json_add_boolean running 1
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else
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json_add_boolean running 0
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fi
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[ -n "$PID" ] && json_add_int pid "$PID"
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[ -n "$FILE" ] && json_add_string file "$FILE"
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[ -n "$LOG" ] && json_add_string log "$LOG"
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[ -n "$STARTED" ] && json_add_string started "$STARTED"
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json_dump
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}
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read_log() {
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load_input
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get_int offset
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[ -n "$offset" ] || offset=0
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read_state
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[ -n "$LOG" ] && [ -f "$LOG" ] || {
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json_init
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json_add_int code 0
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json_add_string data ""
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json_add_int offset 0
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json_add_boolean running 0
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json_dump
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return
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}
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local size data start
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size="$(wc -c < "$LOG" 2>/dev/null)"
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[ "$offset" -le "$size" ] 2>/dev/null || offset=0
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start=$((offset + 1))
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data="$(tail -c +"$start" "$LOG" 2>/dev/null)"
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json_init
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json_add_int code 0
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json_add_string data "$data"
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json_add_int offset "$size"
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if is_running "$PID"; then
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json_add_boolean running 1
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else
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json_add_boolean running 0
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fi
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json_dump
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}
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cleanup() {
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read_state
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if is_running "$PID"; then
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json_error "Cannot clean up while installer is running"
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return
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fi
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rm -rf "$UPLOAD_DIR" "$RUN_DIR" "$STATE_FILE"
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mkdir -p "$UPLOAD_DIR" "$RUN_DIR"
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json_ok "Cleaned"
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}
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case "$1" in
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list)
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method_list
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;;
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call)
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case "$2" in
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upload_start) upload_start ;;
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upload_chunk) upload_chunk ;;
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upload_finish) upload_finish ;;
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run) run_installer ;;
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status) status ;;
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read_log) read_log ;;
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cleanup) cleanup ;;
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*) json_error "Unknown method" ;;
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esac
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;;
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*)
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reply '{}'
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;;
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esac
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