fix(gzip)!: change the default block size #529
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raharper
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@@ Coverage Diff @@
## main #529 +/- ##
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Coverage 13.34% 13.34%
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Files 40 40
Lines 5852 5852
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Hits 781 781
Misses 4943 4943
Partials 128 128
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raharper
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Oct 19, 2023
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Suggestion in commit message:
A tar layer with the same content but compressed with different gzip blocksize
will result in different sha256sums in the final OCI Image. Ecosystem tools
have one current size in use and stacker's current size differ.
Interactions between a stacker-built OCI image and ecosystem tools
which recompress lower layers results in bloated registries which will have
identical tar content but different compressed sha256 blobs.
Unfortunately, the OCI image spec doesn't standardize/encode this in the
specification document. Hence, we change to the current common block size used
in the ecosystem here in the stacker implementation.
BREAKING CHANGE: the default gzip block size is changed to 256<<12, was previously 256<<10. A tar layer with the same content but compressed with different gzip blocksize will result in different sha256sums in the final OCI Image. Ecosystem tools have one current size in use and stacker's current size differ. Interactions between a stacker-built OCI image and ecosystem tools which recompress lower layers results in bloated registries which will have identical tar content but different compressed sha256 blobs. Unfortunately, the OCI image spec doesn't standardize/encode this in the specification document. Hence, we change to the current common block size used in the ecosystem here in the stacker implementation. We now link against our own fork: github.com/project-stacker/umoci which may change depending on the PR getting merged to upstream. Signed-off-by: Ramkumar Chinchani <[email protected]>
Updated. |
raharper
approved these changes
Oct 19, 2023
rchincha
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Nov 17, 2023
BREAKING CHANGE: the default gzip block size is changed to 256<<12, was previously 256<<10. A tar layer with the same content but compressed with different gzip blocksize will result in different sha256sums in the final OCI Image. Ecosystem tools have one current size in use and stacker's current size differ. Interactions between a stacker-built OCI image and ecosystem tools which recompress lower layers results in bloated registries which will have identical tar content but different compressed sha256 blobs. Unfortunately, the OCI image spec doesn't standardize/encode this in the specification document. Hence, we change to the current common block size used in the ecosystem here in the stacker implementation. We now link against our own fork: github.com/project-stacker/umoci which may change depending on the PR getting merged to upstream. Signed-off-by: Ramkumar Chinchani <[email protected]> (cherry picked from commit 0cf2d70) Signed-off-by: Ramkumar Chinchani <[email protected]>
rchincha
added a commit
to rchincha/stacker
that referenced
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Nov 17, 2023
BREAKING CHANGE: the default gzip block size is changed to 256<<12, was previously 256<<10. A tar layer with the same content but compressed with different gzip blocksize will result in different sha256sums in the final OCI Image. Ecosystem tools have one current size in use and stacker's current size differ. Interactions between a stacker-built OCI image and ecosystem tools which recompress lower layers results in bloated registries which will have identical tar content but different compressed sha256 blobs. Unfortunately, the OCI image spec doesn't standardize/encode this in the specification document. Hence, we change to the current common block size used in the ecosystem here in the stacker implementation. We now link against our own fork: github.com/project-stacker/umoci which may change depending on the PR getting merged to upstream. Signed-off-by: Ramkumar Chinchani <[email protected]> (cherry picked from commit 0cf2d70) Signed-off-by: Ramkumar Chinchani <[email protected]>
rchincha
added a commit
that referenced
this pull request
Nov 17, 2023
BREAKING CHANGE: the default gzip block size is changed to 256<<12, was previously 256<<10. A tar layer with the same content but compressed with different gzip blocksize will result in different sha256sums in the final OCI Image. Ecosystem tools have one current size in use and stacker's current size differ. Interactions between a stacker-built OCI image and ecosystem tools which recompress lower layers results in bloated registries which will have identical tar content but different compressed sha256 blobs. Unfortunately, the OCI image spec doesn't standardize/encode this in the specification document. Hence, we change to the current common block size used in the ecosystem here in the stacker implementation. We now link against our own fork: github.com/project-stacker/umoci which may change depending on the PR getting merged to upstream. (cherry picked from commit 0cf2d70) Signed-off-by: Ramkumar Chinchani <[email protected]>
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BREAKING CHANGE: the default gzip block size is changed to 256<<12, was previously 256<<10.
The layers created by ecosystem tools and stacker are different for the same tar content. Unfortunately, the OCI image spec doesn't standardize/encode this in the document. Hence, we standardize in the implementation.
We now link against our own fork: github.com/project-stacker/umoci which may change depending on the PR getting merged to upstream.
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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.