What's the reason for 4GiB tar size limit?

[lacop]

I was trying to diff some large images and ran into the error too large tar blob.

This comes from:

diffoci/pkg/diff/diff.go

Line 1046 in 5b17363

maxTarBlobSize = 1024 * 1024 * 1024 * 4

Any reason for this limit? I built the tool locally with the limit increased to 16 GiB and it seems to work fine. Is this some inherent limitation, or just some sort of safety default?

If the latter, would you be open to accepting PR that either increases it, or at least adds a flag that allows overriding it?

[AkihiroSuda]

Just some sort of safety default.
Probably this should be customizable via a flag.

[AkihiroSuda]

@lacop Would you like to submit a PR? 🙂

[akselerando]

+1 to making this configurable via a flag!

[AkihiroSuda]

PR

• Add scale factor for maxTarBlobSize etc. #117