Opened files on the host are not visible by lsof inside the docker. I…

…nstead, check that file properties remain stable for a specified amount of time.

Dockerfile

@@ -37,8 +37,7 @@ RUN sed -i 's/<application type="normal">/<application type="normal" title="Hand
 RUN \
     apk --no-cache add \
         # For watchfolder
-        findutils \
-        lsof
+        findutils
 
 # Generate and install favicons.
 RUN \

README.md

@@ -76,6 +76,7 @@ of this parameter has the format `<VARIABLE_NAME>=<VALUE>`.
 |`AUTOMATED_CONVERSION_PRESET`| HandBrake preset used by the automatic video converter.  See the [Automatic Video Conversion](#automatic-video-conversion) section for more details. | "Very Fast 1080p30" |
 |`AUTOMATED_CONVERSION_FORMAT`| Video container format used by the automatic video converter for output files.  This is typically the video filename extension.  See the [Automatic Video Conversion](#automatic-video-conversion) section for more details.  | "mp4" |
 |`AUTOMATED_CONVERSION_KEEP_SOURCE`| When set to `0`, a video that has been successfully converted is removed from the watch folder. | 1 |
+|`AUTOMATED_CONVERSION_SOURCE_STABLE_TIME`| Time during which properties (e.g. size, time, etc) of a video file in the watch folder need to remain the same.  This is to avoid processing a file that is being copied. | 5 |
 |`HANDBRAKE_DEBUG`| Setting this to `1` enables HandBrake debug logging.  Log messages are sent to `/config/handbrake.debug.log` (container path).  **NOTE**: When enabled, a lot of information is generated and the log file will grow quickly.  Make sure to enable this temporarily and only when needed. | (unset) |
 
 [TimeZone]: http://en.wikipedia.org/wiki/List_of_tz_database_time_zones

rootfs/etc/services.d/watchfolder/run

@@ -4,6 +4,7 @@ set -u # Treat unset variables as an error.
 
 AUTOMATED_CONVERSION_PRESET="${AUTOMATED_CONVERSION_PRESET:-Very Fast 1080p30}"
 AUTOMATED_CONVERSION_FORMAT="${AUTOMATED_CONVERSION_FORMAT:-mp4}"
+AUTOMATED_CONVERSION_SOURCE_STABLE_TIME="${AUTOMATED_CONVERSION_SOURCE_STABLE_TIME:-5}"
 
 FAILED_CONVERSIONS="/config/failed_conversions"
 SUCCESSFUL_CONVERSIONS="/config/successful_conversions"
@@ -28,14 +29,15 @@ WATCHDIR_HASH_update() {
     WATCHDIR_HASH="$(WATCHDIR_HASH_calculate)"
 }
 
-WATCHDIR_HASH_invalidate() {
-    WATCHDIR_HASH=INVALID
-}
-
 WATCHDIR_HASH_changed() {
     [ "$WATCHDIR_HASH" != "$(WATCHDIR_HASH_calculate)" ]
 }
 
+get_hash() {
+    file="$1"
+    stat -c '%n %s %Y' "$file" | md5sum | cut -d' ' -f1
+}
+
 process_file() {
     file="$1"
 
@@ -46,17 +48,8 @@ process_file() {
         return
     fi
 
-    # Skip file if it is being accessed (may be currently being copied).
-    if lsof -f -- "$file" &>/dev/null; then
-        log "Skipping file '$file': currently being accessed."
-        # Invalidate the watch directory hash.  If we don't, we may never
-        # process this file because the hash may remain the same.
-        WATCHDIR_HASH_invalidate
-        return
-    fi
-
-    # Get hash of the file from its name, size and time.
-    hash="$(stat -c '%n %s %Y' "$file" | md5sum | cut -d' ' -f1)"
+    # Get hash of the file from its properties.
+    hash="$(get_hash "$file")"
 
     # Skip file if it has been already successfully processed.
     if grep -q -w "$hash" "$SUCCESSFUL_CONVERSIONS"; then
@@ -70,6 +63,14 @@ process_file() {
         return
     fi
 
+    # Skip file if it is not stable.
+    echo "Waiting $AUTOMATED_CONVERSION_SOURCE_STABLE_TIME seconds before processing '$file'..."
+    sleep $AUTOMATED_CONVERSION_SOURCE_STABLE_TIME
+    if [ "$hash" != "$(get_hash "$file")" ]; then
+        log "Skipping file '$file': currently being copied."
+        return
+    fi
+
     log "Starting conversion of '$file' ($hash)..."
     basename="$(basename "$file" | sed 's/\.[^.]*$//')"
     $HANDBRAKE_CLI -i "$file" \