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fix: make gzip compression deterministic #262

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Merged
merged 1 commit into from
Nov 10, 2025
Merged

fix: make gzip compression deterministic #262

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8 changes: 5 additions & 3 deletions pkg/leeway/compression.go
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Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,7 @@ import (
)

var (
compressor = "gzip"
compressor = "gzip -n"
decompressor = "gzip -d"
// Number of CPU cores for parallel processing
cpuCores = runtime.NumCPU()
Expand All @@ -20,7 +20,8 @@ func init() {
pigz, err := exec.LookPath("pigz")
if err == nil {
// Use all available CPU cores by default
compressor = fmt.Sprintf("%s -p %d", pigz, cpuCores)
// -n flag ensures deterministic output by not storing timestamps
compressor = fmt.Sprintf("%s -n -p %d", pigz, cpuCores)
}
}

Expand Down Expand Up @@ -128,7 +129,8 @@ func getCompressionCommand(algo CompressionAlgorithm, level int) string {
return ""
default: // Gzip or fallback
if level > 0 {
return fmt.Sprintf("gzip -%d", level)
// -n flag ensures deterministic output by not storing timestamps
return fmt.Sprintf("gzip -n -%d", level)
}
return compressor
}
Expand Down
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