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The ad hoc continuous deployment solution for developers

Project description

CPLOY

Build Status PyPI version Python License: GPL v3

The ad hoc continuous deployment solution for developers

I sometimes have to code stuff that needs to be deployed and run on remote hosts. Since I don’t have all my prefs/settings/dotfiles/etc on the remote, I usually code on local and have a small one-liner lying around that allows me to quickly deploy the code (with scp or similar) and run some command on the other side (with ssh for example). This is not optimal and that’s the reason I created cploy.

Cploy allows to mirror changes performed on a local directory to a remote host through SSH. A specific command (bash one-liner for example) can be run after any change, for example to trigger a build or execute a script.

Features:

  • handle multiple syncs in parallel
  • secure sync through SSH
  • run in the background
  • execute command on each local change
  • ability to exclude some files from sync
  • save and resume tasks
  • load tasks from file

Quick start:

# install cploy
sudo pip3 install cploy
# start the daemon
cploy start
# add a directory to sync
cploy sync /tmp/local someuser@somehost /tmp/remote

see usage for more info


Table of Contents

Installation

To install run:

$ sudo pip3 install cploy
$ cploy --help

Or from github directly

$ cd /tmp; git clone https://github.com/deadc0de6/cploy cploy-git && cd cploy-git
$ sudo python3 setup.py install
$ cploy --help

To work with cploy without installing it, you can do the following

$ cd /tmp; git clone https://github.com/deadc0de6/cploy cploy-git && cd cploy-git
$ sudo pip3 install -r requirements.txt
$ python3 -m cploy.cploy --help

or install it in a virtualenv

$ cd /tmp; git clone https://github.com/deadc0de6/cploy cploy-git && cd cploy-git
$ virtualenv -p python3 env
$ source env/bin/activate
$ python setup.py install
$ cploy --help

Usage

The usual way of using cploy is by starting the daemon. A task will continuously synchronize any change made to a specific local directory on a remote path. All synchronizations are done through SSH.

Start the daemon

$ cploy start --debug

The daemon’s logs are in /tmp/cploy/cploy.log. Debug logs and errors are written to /tmp/cploy/cploy.err.

And add a task to it:

# sync local dir /tmp/local
# on host "somehost" under /tmp/remote
$ cploy sync /tmp/local/ somehost /tmp/remote

That’s it. Now every changes made in the /tmp/local directory will be applied in /tmp/remote on somehost.

Adding a task

Tasks can be added by using the sync command.

After adding a task, make sure to check the daemon to see if the task has been added successfully with cploy info. In case it wasn’t, checking the logs in /tmp/cploy/cploy.{log,err} usually allows to identify the issue.

Connections to a remote hosts is done using SFTP (SSH). Multiple connection options can be applied: connection with password, with SSH keys, using the SSH agent, different port, different username, etc.

Besides using the above switches, The ** argument can also be provided using a compact format similar to what the SSH client provides:

<username>@<hostname>:<port>

The <remote_path> is normalized based on the default user’s directory on the remote (usually $HOME). For example ../../tmp/test would result in /tmp/test if the remote user’s default directory is /home/user. Note that shell expansions are not performed on remote paths (like ~ for example) neither are environment variables (like $HOME).

Once a new task is added, cploy will start by copying any local existing files to the remote directory to initiate the remote directory. Then, any change to the local directory is automatically applied on the remote.

Connection Requirements:

  • SSH access is working (obviously)
  • remote host key is trusted
  • local directory exists (<local_path>)
  • remote directory does not exist (<remote_path>) unless --force is used

Talking with the daemon

A few commands are available to talk to the daemon:

  • start: start the daemon
  • stop: stop the daemon
  • restart: stop and then start the daemon
  • info: get a list of current tasks
  • ping: ping the daemon
  • debug: toggle debug flag
  • unsync: stop syncing a specific task
  • resync: force a full sync of the local directory to the remote one
  • resume: resume sync from a file

If you prefer not to use the daemon, cploy can also be entirely run in the foreground by using the --front switch. However only a single task can be added to it then.

Getting information from the daemon allows to see the different task running and their id:

$ cploy info

File exclusion

Files can be excluded from the sync in the monitored directory by using the --exclude switch. Matching is done using fnmatch.

Example: exclude any hidden files

--exclude '*/.*'

Example: exclude any files containing test

--exclude '*/test*'

Exclusions pattern can be loaded from a file using the --expath switch. The file should contain one pattern per line.

For example:

*/.*
*/test*

Sync events

Here is a list of changes that are synchronized on the remote:

  • File creation
  • File deletion
  • File attribute change
  • File content modification
  • File move

Run a command on change

A command can be added to a task using the --command switch. The provided command will be run on the remote anytime a change is applied on the local monitored directory.

Cploy uses paramiko channel’s exec_command to execute the command which will be run from the default directory of the remote user (usually $HOME).

For example if the remote directory is /tmp/remote and the script to run remotely is located in /tmp/remote/test.sh, the command argument will be --command="/tmp/remote/test.sh".

Currently the specified command is run on any change with no control over the granularity.

Save and resume tasks

Each time cploy’s daemon is stopped, it will append its running tasks to /tmp/cploy/cploy.save. This file can easily be edited or saved for backup.

Cploy can resume tasks from a saved file by calling the resume daemon’s command and providing it with a valid saved file.

Here’s an example of a saved file’s content describing two tasks:

sync /tmp/first host1 /tmp/remote --debug --force
sync /tmp/second host2 /tmp/remote --debug --force

This also allows to describe tasks in a file directly instead of calling the command line for each task. Issuing the following command will load the tasks from /tmp/sometasks

$ cploy resume /tmp/sometasks

Note that sync commands loaded from file get environment variables (and relative path) expanded.

Contribution

If you are having trouble installing or using cploy, open an issue.

If you want to contribute, feel free to do a PR (please follow PEP8).

Have a look at the design directory.

License

This project is licensed under the terms of the GPLv3 license.

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