wait-for's Introduction

wait-for

A small utility that waits for a file to exist, optionally with some permissions.

Building

Either via Docker:

$ git submodule update --init --recursive
$ docker build -t zeit/wait-for .

or using CMake (requires Linux)

$ git submodule update --init --recursive
$ mkdir build && cd build
$ cmake .. -DCMAKE_BUILD_TYPE=Release
$ cmake --build .

Usage

wait-for [--help] [-rwx] [-dfps] [-U <username>] <file>

Wait for a file to exist and optionally have one or modes

-h, --help          Shows this help message
-x, --execute       Wait for the path to become executable
-r, --read          Wait for the path to become readable
-w, --write         Wait for the path to become writable
-p, --pipe          Wait for the path to be a pipe (FIFO)
-s, --socket        Wait for the path to be a socket
-f, --file          Wait for the path to be a regular file
-d, --directory     Wait for the path to be a directory
-U, --username      The username to run access checks for (NOT the user ID)

If multiple modes are specified, wait-for waits for all of them to become available.
If multiple file types are specified, wait-for waits for the file to be any one of the specified types.

License

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wait-for's Issues

Misses some events

We ran into multiple issues where wait-for wouldn't trigger when a file was touched. This caused inexplicable and spontaneous 504s on staging deployments

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