holdup 1.5.0

A tool to wait for services and execute command. Useful for Docker containers that depend on slow to start services (like almost everything).

A tool to wait for services and execute command. Useful for Docker containers that depend on slow to start services (like almost everything).

• Free software: BSD license

Installation

pip install holdup

Documentation

Usage: holdup [-h] [-t SECONDS] [-T SECONDS] [-i SECONDS] [-n] service [service ...] [-- command [arg [arg ...]]]

Wait for services to be ready and optionally exec command.

Positional arguments:

service

A service to wait for. Supported protocols: “tcp://host:port/”, “path:///path/to/something”, “unix:///path/to/domain.sock”, “eval://expr”, “http://urn”, “http://urn” (status 200 expected). Join protocols with a comma to make holdup exit at the first passing one, eg: tcp://host:1,host:2 or tcp://host:1,tcp://host:2 are equivalent and mean “any that pass”.

command

An optional command to exec.

Optional arguments:

-h, --help	show this help message and exit
-t SECONDS, --timeout SECONDS
	Time to wait for services to be ready. Default: 5.0
-T SECONDS, --check-timeout SECONDS
	Time to wait for a single check. Default: 1.0
-i SECONDS, --interval SECONDS
	How often to check. Default: 0.2
-n, --no-abort	Ignore failed services. This makes holdup return 0 exit code regardless of services actually responding.

Development

To run the all tests run:

tox

Note, to combine the coverage data from all the tox environments run:

Windows	set PYTEST_ADDOPTS=--cov-append tox
Other	PYTEST_ADDOPTS=--cov-append tox

Changelog

1.5.0 (2017-06-07)

• Added an eval://expression protocol for weird user-defined checks.

1.4.0 (2017-03-27)

• Added support for HTTP(S) check.

1.3.0 (2017-02-21)

• Add support for “any” service check (service syntax with comma).

1.2.1 (2016-06-17)

• Handle situation where internal operations would take more than planned.

1.2.0 (2016-05-25)

• Added a file check.

1.1.0 (2016-05-06)

• Removed debug print.
• Added --interval option for how often to check. No more spinloops.

1.0.0 (2016-04-22)

• Improved tests.
• Always log to stderr.

0.1.0 (2016-04-21)

• First release on PyPI.