113 lines
2.7 KiB
Plaintext
113 lines
2.7 KiB
Plaintext
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#!/bin/bash
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# (c) Wolfgang Ziegler // fago
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#
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# Inotify script to trigger a command on file changes.
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#
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# The script triggers the command as soon as a file event occurs. Events
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# occurring during command execution are aggregated and trigger a single command
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# execution only.
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#
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# Usage example: Trigger rsync for synchronizing file changes.
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# ./watch.sh rsync -Cra --out-format='[%t]--%n' --delete SOURCE TARGET
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#
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# ./watch.sh rsync -Cra --out-format='[%t]--%n' --include core \
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# --WATCH_EXCLUDE=sites/default/files --delete ../web/ vagrant@d8.local:/var/www
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######### Configuration #########
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watch() {
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EVENTS="CREATE,CLOSE_WRITE,DELETE,MODIFY,MOVED_FROM,MOVED_TO"
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COMMAND="$@"
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# echo $COMMAND $WATCH_DIR, $WATCH_VERBOSE
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## The directory to watch.
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if [ -z "WATCH_DIR" ]; then
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WATCH_DIR=.
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fi
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## WATCH_EXCLUDE Git and temporary files from PHPstorm from watching.
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if [ -z "$WATCH_EXCLUDE" ]; then
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WATCH_EXCLUDE='(\.git|___jb_)'
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fi
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## Whether to enable verbosity. If enabled, change events are output.
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if [ -z "WATCH_VERBOSE" ]; then
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WATCH_VERBOSE=0
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fi
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##################################
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if [ -z "$1" ]; then
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echo "Usage: $0 Command"
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exit 1;
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fi
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##
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## Setup pipes. For usage with read we need to assign them to file descriptors.
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##
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RUN=$(mktemp -u)
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mkfifo "$RUN"
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exec 3<>$RUN
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RESULT=$(mktemp -u)
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mkfifo "$RESULT"
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exec 4<>$RESULT
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clean_up () {
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## Cleanup pipes.
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rm $RUN
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rm $RESULT
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}
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## Execute "clean_up" on exit.
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trap "clean_up" EXIT
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##
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## Run inotifywait in a loop that is not blocked on command execution and ignore
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## irrelevant events.
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##
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inotifywait -m -q -r -e $EVENTS --exclude $WATCH_EXCLUDE --format '%w%f' $WATCH_DIR | \
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while read FILE
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do
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if [ $WATCH_VERBOSE -ne 0 ]; then
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echo [CHANGE] $FILE
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fi
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## Clear $PID if the last command has finished.
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if [ ! -z "$PID" ] && ( ! ps -p $PID > /dev/null ); then
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PID=""
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fi
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## If no command is being executed, execute one.
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## Else, wait for the command to finish and then execute again.
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if [ -z "$PID" ]; then
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## Execute the following as background process.
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## It runs the command once and repeats if we tell him so.
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($COMMAND; while read -t0.001 -u3 LINE; do
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echo running >&4
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$COMMAND
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done)&
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PID=$!
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WAITING=0
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else
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## If a previous waiting command has been executed, reset the variable.
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if [ $WAITING -eq 1 ] && read -t0.001 -u4; then
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WAITING=0
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fi
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## Tell the subprocess to execute the command again if it is not waiting
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## for repeated execution already.
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if [ $WAITING -eq 0 ]; then
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echo "run" >&3
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WAITING=1
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fi
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## If we are already waiting, there is nothing todo.
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fi
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done
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}
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