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fdf917e1 SBS |
1 | #!/bin/bash |
2 | ||
3 | # Date: 2020-04-08T23:37Z | |
4 | ||
5 | # Description: A bash script that hashes files immediately after they | |
6 | # are modified. Watches for 1 hour then exits. | |
7 | ||
8 | # Dependencies: inotifywait, timeout, awk, b2sum, date | |
9 | ||
10 | echoerr() { echo "$@" 1>&2; } | |
11 | ||
12 | DIR_TO_WATCH="/home/baltakatei/Sync" | |
13 | DIR_LOG="/home/baltakatei/Sync/kodawkuori-07/2020/archive-PERS/logs/files" | |
14 | DIGEST_ALGO="b2sum" | |
15 | DIR_LOG_PATH=$DIR_LOG"/""$(date +%Y%m%d)""..""$(hostname)""_""$DIGEST_ALGO""_filewrites.log" # The .log extension is important for inotifywait "--exclude" option. | |
16 | TIMEOUT="1h" # Limit inotifywait process to 1 hour. | |
17 | MIN_FILE_SIZE=1 # smallest file size to log (in bytes) | |
18 | ||
19 | if ! command -v "$DIGEST_ALGO" 1>/dev/null 2>/dev/null; then echoerr "ERROR: $0 could not find command $DIGEST_ALGO ."; exit 1; fi | |
20 | ||
21 | if [ ! -d "$DIR_TO_WATCH" ]; then echoerr "ERROR: $0 could not parse $DIR_TO_WATCH as directory."; exit 1; fi | |
22 | ||
23 | timeout $TIMEOUT inotifywait -m -e close_write -e moved_to --exclude ".tmp$" --exclude ".log$" -r --format "%w%f" "$DIR_TO_WATCH" | | |
24 | while read line; do | |
25 | # note: make sure to exclude the $DIR_LOG_PATH via ".log$" (or equivalent means) to avoid endless logging of log writes. | |
26 | EVENT_DATE="$(date +%Y%m%dT%H%M%S.%N%z )" | |
27 | TARGET_FILEPATH="$(echo -n $line )" | |
28 | TARGET_FILENAME="$(basename "$TARGET_FILEPATH" )" | |
29 | TARGET_FILESIZE="$(du -b "$TARGET_FILEPATH" | awk '{print $1}' )" | |
30 | TARGET_FILEMTIME="$(date -r "$TARGET_FILEPATH" +%Y%m%dT%H%M%S.%N%z)" | |
31 | TARGET_DIGEST="$(cat "$TARGET_FILEPATH" | $DIGEST_ALGO | awk '{print $1}' )" | |
32 | EVENT_LOG_ENTRY="$EVENT_DATE","$TARGET_FILEMTIME","$DIGEST_ALGO","$TARGET_DIGEST","$TARGET_FILESIZE","$TARGET_FILEPATH" | |
33 | echo "$EVENT_LOG_ENTRY" >> /dev/random # Mix written file's digest with system PRNG. | |
34 | if [ -d "$DIR_LOG" ] && [ $(( "$TARGET_FILESIZE" - "$MIN_FILE_SIZE" )) -ge 0 ]; then | |
35 | if [ ! -f "$DIR_LOG_PATH" ]; then | |
36 | echo "EVENT_DATE,TARGET_FILEMTIME,DIGEST_ALGO,TARGET_DIGEST,TARGET_FILESIZE,TARGET_FILEPATH" >> "$DIR_LOG_PATH" # print field names in first row | |
37 | fi | |
38 | echo "$EVENT_LOG_ENTRY" >> "$DIR_LOG_PATH"; # Log written file's digest if TARGET_FILESIZE greater or equal to MIN_FILE_SIZE (in bytes). | |
39 | #echo "$EVENT_LOG_ENTRY" >> /tmp/bkhashwatch.log #debug | |
40 | fi | |
41 | done | |
42 | echo "Timeout of $TIMEOUT elapsed. Exiting." | |
43 | exit 0 |