Babysitter is a simple program to launch daemons, and keep them running.
git clone https://github.com/twitchyliquid64/babysitter
cd babysitter
go build -o babysitterbabysitter is configured exclusively through commandline arguments. Commandline arguments are specified with --flagname <flagvalue>. The first argument (and all subsequent arguments) which does not match the --flag value pattern are invoked as the child daemon.
| Flag | Explanation |
|---|---|
service-name |
Name to be shown in the web UI if enabled. Defaults to 'babysitter'. |
status-serv |
Listener address of the web UI. The web UI & webhooks are disabled if this is not specified. |
status-color |
Background color of the web UI. Defaults to #F0F0F0. |
show-full-data |
If set to true, the web UI will show all arguments being invoked (which could present a information leak). |
stdout |
Path to the file where stdout will be logged. If not specified, stdout will be written to babysitters' stdout. |
stderr |
Path to the file where stderr will be logged. If not specified, stderr will be written to babysitters' stderr. |
restart-delay-ms |
Number of milliseconds to delay between restarting the child daemon. Defaults to 2000. |
webhook-script |
Path to shell script to be invoked when a web request is recieved at /webhook/<webhook-token>. |
webhook-token |
Secret component of the webhook path. |
dir |
Working directory of the daemon to be launched. Defaults to the current working directory. |
./babysitter \
--status-serv :7000 \
--stdout /var/log/main_serv_out \
--webhook-script /etc/onGithubPush.sh \
--webhook-token superDuperSecretToken \
/bin/mySecretServer --environment prodIn the above configuration, babysitter will invoke /bin/mySecretServer --environment prod, saving stdout to /var/log/main_serv_out. The webUI will be accessible on port 7000, and HTTP requests will server:7000/webhook/superDuperSecretToken invoke /etc/onGithubPush.sh.
As per defaults
- The webUI will not show arguments to /bin/mySecretServer, the webhook script, or the token
- The delay between invocations of
/bin/mySecretServer(when it exits) is 2000ms. - The working directory of
/bin/mySecretServerwill default to the same as babysitter's.
The webhook is enabled when webhook-token, webhook-script and status-serv are specified.
Web requests to /webhook/<webhook-token-value> will result in bash invoking the script at webhook-script. The first parameter will be to a file which contains the HTTP body submitted with the request (empty file for any HTTP request whose method is not POST).
If the script exits with an exit code of 0, the daemon will be terminated and restarted.
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