52 lines
2.5 KiB
Markdown
52 lines
2.5 KiB
Markdown
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---
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title: legdur - keep your legacy durable
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date: 2022-06-25
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tags: [cli, rust]
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---
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Hey, I wrote a thing. Thing being a piece of software.
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I have a collection of photos & documents that I really care about.
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I synch them between computers using syncthing and also run backups regularly.
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What I didn't have was a way to quickly detect bitrot.
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Enter [legdur](https://crates.io/crates/legdur)
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`legdur` is a simple CLI program to compute hashes of large sets of files in large directory structures and compare them with a previous snapshot.
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Think having your photo collection you acquired over time and worrying about bitrot.
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## Installation
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`cargo install legdur --force` should get you there on a system that has Rust installed already.
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## Usage
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`legdur path/to/a/directory/`
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working:
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```shell
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legdur ~/documents
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2022-06-25T06:45:51.000214Z INFO legdur: scanning '/home/cyryl/documents'
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2022-06-25T06:45:51.044471Z INFO legdur: list of files acquired, calculating hashes...
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█████████████████████████████████████████████████████████████░░░░░░░░░░░░░░░░ 2788/3190
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```
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finished:
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```shell
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2022-06-25T06:49:23.776229Z INFO legdur: hash calculation complete
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2022-06-25T06:49:23.784499Z INFO legdur: /home/cyryl/documents/legdur.db saved
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2022-06-25T06:49:23.792585Z INFO legdur: comparing /home/cyryl/documents/legdur.db with /home/cyryl/documents/legdur.old
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2022-06-25T06:49:23.826548Z WARN legdur: /home/cyryl/documents/legdur.db: 395f65f5727f946c0208f79cfe1f3de1bd81e491bb7631ba6f41fc578d3db368 -> 7d1b9748ed291eb6874c91917b5619eb8e1410e7cbfd37a517c5bd4ddf8c7895
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2022-06-25T06:49:23.826715Z WARN legdur: /home/cyryl/documents/legdur.old: e56cf4f6b7fdc2daa3ca3430e8e64bf9d042f1c0e465dcd452986709cb25f7d8 -> 395f65f5727f946c0208f79cfe1f3de1bd81e491bb7631ba6f41fc578d3db368
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```
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## How it works
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* it will compute a hash of each file present in the directory structure (it works recursively).
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* if previously computed `legdur.db` exists it will compare the current state of the world to the one represented by `legdur.db` and output any differences. Only files that changed or got deleted get printed out, additions are not.
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* it will move the current `legdur.db` to `legdur.old` and write the new state of the world to a new `legdur.db`
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## Contact & contributions
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* Let me know if you'd like to hack on this by contacting me on `legdur@cyplo.dev` or via `cyplo@todon.nl` on Mastodon.
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