A simple content addressing system in under 100 lines of Python.
This is my first time using Python, so some parts may seem a bit weird. Feedback welcome.
hash-import /path/to/file
Hashes the file
Creates a read-only copy
Prints content address in various formats
hash-lookup hash://sha256/...
Writes the file content to standard output
hash-lookup --path hash://sha256/...
Prints the path to a read-only copy of the file
Files are stored in ~/.local/cas-demo
If it's so easy, why did StrongLink take you 3 years and 10,000 lines of code?
Because I wrote it in C.
And because the real system:
- Tracks file meta-data (including tags and full-text indexing)
- Has a way to find files/hashes without file or hash (search)
- Uses a database instead of hardlinks everywhere
- Supports hash algorithm plugins (not technically done yet)
- Supports more hash formats (short, base-64, etc.)
- Is ACID (and coordinates transactions between DB and file system)
- Supports multiple repos per user (at arbitrary paths)
- Handles hash collisions (aside from the primary hash)
- Has a basic user interface
- Has a sync protocol
For what it's worth, the first ~2 years were just prototyping. The C version was only started a little over a year ago.
- Optimize importing by only calling
mkdir(2)if the directory doesn't already exist - Ensure ACID by
fsyncing the directories after their contents have been changed - Support different hash lengths (12 bytes, 24 bytes and 32 bytes) and base-64 encoding
- Figure out how to resolve links when you click on them
- On OS X, you might be able to use
LSSetDefaultHandlerForURLScheme
- On OS X, you might be able to use
.
License: MIT