findSequenceOnDisk does not find files on Samba shares with mismatched case (POSIX case-insensitivity)

[herronelou]

What happened?

On a Linux system accessing files stored on a Samba (case-insensitive) share, the findSequenceOnDisk method fails to find files if the on-disk filenames have different case than what is provided in the search pattern. This is inconsistent with the behavior of os.path.exists() and the practical case-insensitivity of such setups.

While the documentation and code assume POSIX means case-sensitive, many modern POSIX filesystems or networked filesystems (like Samba) are not strictly case-sensitive.

This may not strictly be a "bug" (since the documented behavior is POSIX/regex style), but it is easy for users to be surprised if they work cross-platform, especially when the behavior differs from the actual underlying file visibility.

List all the operating systems versions where this is happening

Linux (tested over a Samba share). Likely affects any POSIX system accessing a case-insensitive (e.g., SMB or FAT32) filesystem.

On what computer hardware is this happening?

Standard workstation; not hardware-dependent.

Relevant console log output

raises:
fileseq.exceptions.FileSeqException: no sequence found on disk matching /path/to/seq.####.exr

Environment variables

N/A, no unusual environment variables.

Extra information

In a future versin, if the project considers raising minimum Python requirement to 3.12, it could consider using glob's new case-sensitivity options to match what the filesystem supports. I don't think this requires a fix but I wanted to flag it, as we bumped into it in production.

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