update to go1.27rc2 - #7010
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- relates to update to go1.27rc2 moby#53279
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
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Build golangci-lint with Staticcheck v0.8.0-rc.1 to handle the Go 1.27 AST. Disable SA4023 because unsupported platform stubs cause false positives during multiplatform linting. Apply Go 1.27 formatting and replace the deprecated plain HTTP resolver option. Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
Go 1.27 changed compress/flate encoder output in CL 707355 while improving compression speed (golang/go#75532). This changes the bytes of every gzip-compressed layer BuildKit produces, and therefore their digests, breaking cache reuse and content dedup against layers built by earlier BuildKit releases. Vendor the writer half of Go 1.26.5's compress/flate as util/compression/go126flate (verbatim copy of tag go1.26.5, c19862e5f8415b4f24b189d065ed739517c548ba) together with the small amount of gzip framing that image layers use, and route the gzip compressor through it. Output is byte-identical to Go 1.26.5 compress/gzip for all compression levels, so layer digests stay stable regardless of the toolchain BuildKit is built with. Note this only covers the plain gzip compressor; estargz and nydus still use the stdlib encoder. Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
contains containerd/stargz-snapshotter#2333 Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
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