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Christian Zangl 2019-10-04 22:57:08 +02:00
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@ -5,10 +5,12 @@ chkbit is a lightweight **bitrot detection tool**.
bitrot (a bit flipping in your data) can occur bitrot (a bit flipping in your data) can occur
- at a low level on the storage media through decay (hdd/sdd) - at a low level on the storage media through decay (hdd/sdd)
- at a high level in the os or firmware through bugs - at a high level in the OS or firmware through bugs
chkbit is independent of the file system and can help you detect bitrot on you primary system, on backups and in the cloud. chkbit is independent of the file system and can help you detect bitrot on you primary system, on backups and in the cloud.
This is the successor to [chkbit/node](https://github.com/laktak/chkbit-py). It will use and upgrade the index files created by the node version.
## Installation ## Installation
``` ```
@ -31,6 +33,8 @@ chkbit will
- update the index with md5 hashes for every file. - update the index with md5 hashes for every file.
- report bitrot for files that rotted since the last run (check the exit status). - report bitrot for files that rotted since the last run (check the exit status).
Run `chkbit PATH` to verify only.
``` ```
usage: chkbit.py [-h] [-u] [-f] [-q] [-v] PATH [PATH ...] usage: chkbit.py [-h] [-u] [-f] [-q] [-v] PATH [PATH ...]
@ -88,7 +92,7 @@ The advantage of the .chkbit files is that
- when you move a directory the index moves with it - when you move a directory the index moves with it
- when you make a backup the index is also backed up - when you make a backup the index is also backed up
The disadvantage is that you get hidden `.chkbit` files in your content folders. The disadvantage is obviously that you get hidden `.chkbit` files in your content folders.
### How does chkbit work? ### How does chkbit work?
@ -109,31 +113,33 @@ Create test and set the modified time:
``` ```
$ echo foo1 > test; touch -t 201501010000 test $ echo foo1 > test; touch -t 201501010000 test
$ chkbit -u . $ chkbit -u .
a ./test add ./test
$ Processed 1 file(s).
Indices were updated.
``` ```
`a` indicates the file was added. `add` indicates the file was added.
Now update test with a new modified: Now update test with a new modified:
``` ```
$ echo foo2 > test; touch -t 201501010001 test # update test & modified $ echo foo2 > test; touch -t 201501010001 test # update test & modified
$ chkbit -u . $ chkbit -u .
u ./test upd ./test
$ Processed 1 file(s).
Indices were updated.
``` ```
`u` indicates the file was updated. `upd` indicates the file was updated.
Now update test with the same modified to simulate bitrot: Now update test with the same modified to simulate bitrot:
``` ```
$ echo foo3 > test; touch -t 201501010001 test $ echo foo3 > test; touch -t 201501010001 test
$ chkbit -u . $ chkbit -u .
E ./test ROT ./test
Processed 0 file(s).
chkbit detected bitrot in these files: chkbit detected bitrot in these files:
./test ./test
error: detected 1 file(s) with bitrot! error: detected 1 file(s) with bitrot!
$
``` ```
`E` indicates an error. `ROT` indicates bitrot.