bug#66519: b2sum, md5sum sha*sum etc broken on filenames including backslash

[Pádraig Brady]

tag 66519 notabug
close 66519
stop

On 13/10/2023 13:31, Simon Richter M. Sc. wrote:
> I noticed some broken checksums with leading backslash and wrong
> filenames in my checksum files because the original filenames contained
> a backslash.
>
> Way to reproduce:
> % touch test\\test.file
> % b2sum test\\test.file
>
> expected output:
> 786a02f742015903c6c6fd852552d272912f4740e15847618a86e217f71f5419d25e1031afee585313896444934eb04b903a685b1448b755d56f701afe9be2ce
>    test\test.file
>
> real broken output:
> \786a02f742015903c6c6fd852552d272912f4740e15847618a86e217f71f5419d25e1031afee585313896444934eb04b903a685b1448b755d56f701afe9be2ce
>    test\\test.file

This is expected.
File names with problematic characters like \n are escaped as above.
Note we escape '\' itself to provide some forward compatibility
to introduce escaping of other characters.

> Tested with coreutils 9.3 and coreutils 9.4 and LC_ALL=C
> Btw any chance we get b3sum included in coreutils?

Yes we'll look at this,
but it will only be provided through the `cksum -a blake3` interface.

cheers,
Pádraig