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# lethe README
```lethe``` is a Python module for git-based snapshotting.
`lethe` is a Python module for git-based snapshotting.
```lethe``` is intended as a mechanism for creating commits outside
`lethe` is intended as a mechanism for creating commits outside
the standard git branching/tagging workflows. It is meant to enable
additional use-cases without disrupting the standard workflows.
Use cases include:
- Short-lived:
- On-disk **undo log**
- **Syncing work-in-progress** between computers before it's ready
- **Syncing work-in-progress** between computers before it's ready
- Long-lived:
- **lab notebook**: Recording the code / configuration state that resulted in a given output
- **incremental backup**: Space-efficient time-based backups of a codebase
- **incremental backup**: Space-efficient time-based backups of a codebase
## Usage
### Creating a commit from the command line
### Creating a commit from the command line
```bash
$ cd path/to/repo
$ lethe
122d058e375274a186c407f28602c3b14a2cab95
```
This effectively snapshots the current state of the repository (as would be seen by
```git add --all```) and creates a new commit (```122d058e375274a186c407f28602c3b14a2cab95```)
`git add --all`) and creates a new commit (`122d058e375274a186c407f28602c3b14a2cab95`)
which points to it. The current branch and index are not changed.
### Flags:
- ```-p my_parent_ref``` is used to provide "parent" refs which become the parents of the created commit.
- `-p my_parent_ref` is used to provide "parent" refs which become the parents of the created commit.
If a parent ref is a symbolic ref, *both* the provided ref and the ref it points to are used as parents.
If not present, defaults to ```-p HEAD```.
- ```-t ref/lethe/my_target_ref``` is used to provide "target" refs which will be created/updated
If not present, defaults to `-p HEAD`.
- `-t ref/lethe/my_target_ref` is used to provide "target" refs which will be created/updated
to point to the created commit.
If not present, defaults to adding an entry of the form ```-t refs/lethe/my_branch``` for each
parent ref of the form ```refs/heads/my_branch```, and ```-t refs/lethe/my/refpath``` for non-head
refs of the form ```refs/my/refpath```. All provided parent refs *and* any dereferenced parent refs
If not present, defaults to adding an entry of the form `-t refs/lethe/my_branch` for each
parent ref of the form `refs/heads/my_branch`, and `-t refs/lethe/my/refpath` for non-head
refs of the form `refs/my/refpath`. All provided parent refs *and* any dereferenced parent refs
are used to generate default target refs.
If any of the target refs already exist, the commits they point to become parents of the created commit.
- ```-m "my message"``` sets the commit message for the snapshot. By default, "snapshot <current datetime>" is used.
- ```-r path/to/repo``` can be provided to specify a repository outside of the current working directory.
- `-m "my message"` sets the commit message for the snapshot. By default, "snapshot <current datetime>" is used.
- `-r path/to/repo` can be provided to specify a repository outside of the current working directory.
```bash
$ cd path/to/repo
@ -73,9 +73,9 @@ print('Code (tree) state is ' + tree_sha)
Requirements:
* python 3 (written and tested with 3.6)
* git (accessible on the system ```PATH```)
* git (accessible on the system `PATH`)
Install with pip:
```bash
pip install lethe
pip3 install lethe
```