fix(gzip)!: change the default block size#529
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rchincha merged 1 commit intoproject-stacker:mainfrom Oct 20, 2023
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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
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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 <rchincha@cisco.com>
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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 <rchincha@cisco.com> (cherry picked from commit 0cf2d70) Signed-off-by: Ramkumar Chinchani <rchincha@cisco.com>
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 <rchincha@cisco.com> (cherry picked from commit 0cf2d70) Signed-off-by: Ramkumar Chinchani <rchincha@cisco.com>
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 <rchincha@cisco.com>
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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.