Commits on Apr 1, 2024

1. executor: fix overlay layer limit for non-rootfs mounts …

   Historic layer limit for Docker images is 127. Because in
   overlayfs mounting 127 layers usually reaches the page size
   limit of mount options in Linux kernel, there is special code
   to work around the limitation.
   
   This custom code was used for rootfs of container because
   runc takes rootfs as a directory path, meaning buildkit needs
   to mount it and then pass the path. For non-rootfs mounts
   runc takes them as direct mount configuration and performs
   the mount itself. As runc does not have this special way to
   mount long overlayfs mounts it will perform the mount with clipped
   options what will fail in some way in kernel depending on the
   precise cutoff point.
   
   Workaround is to detect when the mount passed to runc is too
   long for runc to mount it itself and it that case let
   BuildKit mount it and in runc perform bind of the BuildKit mount.
   
   Signed-off-by: Tonis Tiigi <[email protected]>

   

   tonistiigi committed Apr 1, 2024
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