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cmd/nixbuild: instantiated deduplicate stat

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Use case for this came up while writing tests.
This commit is contained in:
Yonah 2025-07-18 21:19:16 +09:00
parent 69c6128ff5
commit 8f799c8d95
Signed by: yonah
SSH Key Fingerprint: SHA256:vnQvK8+XXH9Tbni2AV1a/8qdVK/zPcXw52GM0ruQvwA
1 changed files with 26 additions and 0 deletions
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26
cmd/nixbuild/main.go
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@ -118,6 +118,32 @@ func main() {
}).
Flag(&resolveFlagOut, "o", command.StringFlag("store-paths"), "Path to write collected store paths")
c.Command("stat", "Compute the instantiated deduplication stat of an installable", func(args []string) error {
var installable string
if err := formatInstallable("instantiated", &installable, flagNixOS, args); err != nil {
return err
}
log.Println("initialising evaluator")
var collective []string
if eval, err := nixbuild.NewInstantiatedEvaluator(ctx, installable); err != nil {
return commandHandlerError(fmt.Sprintf("cannot initialise evaluator: %v", err))
} else {
log.Println("collecting paths")
collective = slices.Collect(eval.Instantiated())
if err := eval.Err(); err != nil {
return commandHandlerError(fmt.Sprintf("cannot collect: %v", err))
}
}
l := len(collective)
slices.Sort(collective)
collective = slices.Compact(collective)
log.Printf("`%s`: %d paths instantiated, %d duplicate, dedup %.1f%%",
installable, l, l-len(collective), float64(l-len(collective))/float64(l)*100)
return nil
})
c.Command("instantiated", "Evaluate an installable and output all derivations instantiated during evaluation", func(args []string) error {
var installable string
if err := formatInstallable("instantiated", &installable, flagNixOS, args); err != nil {