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ociruntime: handle images with high layer count #7630

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ociruntime: handle images with high layer count #7630

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Commits on Oct 4, 2024

  1. ociruntime: handle images with high layer count 

    When the action required an image with more than 20 layers, our mount
will fail with

```
create OCI bundle: create rootfs: mount overlayfs: no such file or directory
```

After some digging, it seems like 20 is the current limit of the number
of lowerdir allowed in each mount call.

Add special logic to break down images with more than 20 layers into
groups of 20. For each group, create an overlayfs mount called
"merged<group-id>" in the same bundle dir. The final overlayfs will then
be composed of these "merged" groups as lowerdirs.
    @sluongng
    sluongng committed Oct 4, 2024
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