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# ltask
lightweight remote task management
## Usage
ltask [OPTIONS] TASK TARGET
Options:
-H HOST Add HOST to target hosts. can be used
to target single hosts without defining
a custom target
-p Force parallel execution
-h print this help text
## Output
All output from targets is printed to `STDOUT`, prefixed by the hostname.
This also includes text sent to `STDERR`, which is prefixed by `[ERR]`.
Text is displayed "as it comes", not grouped by host.
Status and error messages are printed to `STDERR`.
In Linear execution mode, ltask displays a progress meter.
## How it works
`ltask` executes scripts (`tasks`) on remote hosts and hostgroups (`targets`) via SSH,
either linearly if user input is required, or in parallel.
Tasks and targets are written in bash, thus are very flexible.
No special Software is required, neither on the host nor on the target.
### Tasks
A task contains two parts: the setup and the execution.
Setup is executed by ltask on the master machine to set configuration variables like username and which SSH identity to use,
Execution is run on targets.
The task has to decide which part to run based on the envvar `HOSTMODE=yes`, which is only set in the host environment.
If `HOSTMODE` is empty/not set it defaults to execution mode.
The setup must set the `TASK_ISSET` variable to any non-empty value on success.
Reference for environment variables
# To be set by task
SSH_USER username to connect as
SSH_IDENTITY path to ssh-key used for authentification of specified user
FILES Array of Files to copy over before script invocation
INCLUDES Array of libraries to include
PARALLEL Enable parallel execution (yes/[no])
# Available in setup
ASSET_DIR path to folder where eg keys are stored
TOOL_DIR path to helper script folder
Tasks are stored in `tasks/`
[Example](tasks/example)
### Targets
Targets define hostgroups for tasks to target.
They aren't executed but sourced by ltask, thus must be written in bash.
Hosts are stored in the `HOSTS` array with format `hostname[:port]`.
The port should only be specified if != 22 to avoid double mentions.
`HOSTS` is checked for duplicate, `host:22` and `host` would produce the same result but are not caught by duplicate search.
Targets are stored in `targets/`
[Example](targets/example)
### Libraries
Libraries are scripts which are executed on the remote host before the main task.
Their purpose is to define generic interfaces for different types of hosts.
Libraries are stored in `libs/`
[Example](libs/pkgmanager)
## License
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
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