Sv Utils

svrun - avoid skeleton service burden

According to the runit-scripts (tarball) a minimal skeleton service (using Alpine Linux) looks like:

#!/usr/bin/env sh
# /etc/sv/skeleton/run
set -eu

exec 2>&1

COMMAND=daemon
USER=root

exec /usr/bin/chpst -u ${USER} ${COMMAND}

See also:

• Does runit support user-specific services?

#!/usr/bin/env sh
# /etc/sv/skeleton/log/run
set -eu

SERVICE_NAME=`basename $(dirname $(dirname $(readlink -f $0)))`
LOG_DIR=/var/log/runit/${SERVICE_NAME}
USER=root
GROUP=root

# Create log dir and fix owner & mode
mkdir -p ${LOG_DIR}
chown ${USER}:${GROUP} ${LOG_DIR}
chmod 700 ${LOG_DIR}

exec /usr/bin/chpst -u ${USER} /usr/bin/svlogd -tt ${LOG_DIR}

Using sv-utils:

#!/usr/bin/env svrun

service('daemon').call

#!/usr/bin/env svrun

loggerd.call

Moreover, options as :user and :group are supported by loggerd and service methods, as:

service('daemon', user: :john_doe).call

:command, defined in config for loggerd, is used by default, but it can be overriden (for example using socklog):

#!/usr/bin/env svrun

loggerd(['svlogd', '-t', 'main/*'], user: :log).call

Log directory is created, under the hood, during loggerd call.

sv-utils is an attempt to bring DRY principle to runit services creation.

See also

• UNIX Programming by Example: Runit