Golang Automatic Reloads
I wrote a short Bash script to automatically reload Go programs.
The script acts as a light wrapper around go run, stopping and restarting it whenever a .go file in your current directory or $GOPATH/src folder is saved. I've been using it mainly when developing web applications, in the same way that I use Shotgun or Guard when working with Ruby.
You can grab this from the GitHub repository.
#!/bin/bash
function monitor() {
if [ "$2" = "true" ]; then
# Watch all files in the specified directory
# Call the restart function when they are saved
inotifywait -q -m -r -e close_write -e moved_to $1 |
while read line; do
restart
done
else
# Watch all *.go files in the specified directory
# Call the restart function when they are saved
inotifywait -q -m -r -e close_write -e moved_to --exclude '[^g][^o]$' $1 |
while read line; do
restart
done
fi
}
# Terminate and rerun the main Go program
function restart {
if [ "$(pidof $PROCESS_NAME)" ]; then
killall -q -w -9 $PROCESS_NAME
fi
echo ">> Reloading..."
eval "go run $ARGS &"
}
# Make sure all background processes get terminated
function close {
killall -q -w -9 inotifywait
exit 0
}
trap close INT
echo "== Go-reload"
WATCH_ALL=false
while getopts ":a" opt; do
case $opt in
a)
WATCH_ALL=true
;;
\?)
echo "Invalid option: -$OPTARG" >&2
exit 0
;;
esac
done
shift "$((OPTIND - 1))"
FILE_NAME=$(basename $1)
PROCESS_NAME=${FILE_NAME%%.*}
ARGS=$@
# Start the main Go program
echo ">> Watching directories, CTRL+C to stop"
eval "go run $ARGS &"
# Monitor all /src directories on the GOPATH
OIFS="$IFS"
IFS=':'
for path in $GOPATH
do
monitor $path/src $WATCH_ALL &
done
IFS="$OIFS"
# If the current working directory isn't on the GOPATH, monitor it too
if [[ $PWD != "$GOPATH/"* ]]
then
monitor $PWD $WATCH_ALL
fi
wait
Usage
The only dependency for this script is inotify-tools, which is used to monitor the filesystem for changes.
$ sudo apt-get install inotify-tools
Once you've downloaded (or copy-pasted) the script, you'll need to make it executable and move it to /usr/local/bin or another directory on your system path:
$ wget https://raw.github.com/alexedwards/go-reload/master/go-reload
$ chmod +x go-reload
$ sudo mv go-reload /usr/local/bin/
You should then be able to use the go-reload command in place of go run:
$ go-reload main.go
== Go-reload
>> Watching directories, CTRL+C to stop