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instantiated: attach decode function to decoder

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Ophestra 2025-07-14 19:05:16 +09:00
parent 93f447163d
commit c1cdd0b559
Signed by: cat
SSH Key Fingerprint: SHA256:gQ67O0enBZ7UdZypgtspB2FDM1g3GVw8nX0XSdcFw8Q
2 changed files with 9 additions and 12 deletions
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15
instantiated.go
View File

@ -108,12 +108,10 @@ func (d *InstantiatedDecoder) Drv() iter.Seq[string] {
}
}
// DecodeInstantiated interprets the verbose output of `nix build` and returns a slice of all instantiated derivations.
func DecodeInstantiated(r io.Reader) ([]string, error) {
decoder := NewInstantiatedDecoder(r)
// Decode collects and deduplicates derivations emitted by [InstantiatedDecoder].
func (d *InstantiatedDecoder) Decode() ([]string, error) {
instantiated := make([]string, 0, instantiatedInitialCap)
for drv := range decoder.Drv() {
for drv := range d.Drv() {
if len(instantiated) == cap(instantiated) {
// grow the buffer exponentially to minimise copies
instantiated = slices.Grow(instantiated, cap(instantiated)<<1)
@ -122,12 +120,11 @@ func DecodeInstantiated(r io.Reader) ([]string, error) {
}
slices.Sort(instantiated)
return slices.Compact(instantiated), decoder.Err()
return slices.Compact(instantiated), d.Err()
}
// EvalInstantiated evaluates the installable and returns all derivations instantiated during the evaluation.
// This relies on verbose output of `nix build` and is certainly not the correct way to do it, but so far it works
// This interprets verbose output of `nix build` and is certainly not the correct way to do it, but so far it works
// significantly better than `nix-store -qR` and there does not appear to be a better way.
func EvalInstantiated(ctx context.Context, installable string) ([]string, error) {
c, cancel := context.WithCancel(ctx)
@ -153,7 +150,7 @@ func EvalInstantiated(ctx context.Context, installable string) ([]string, error)
return nil, err
}
instantiated, decodeErr := DecodeInstantiated(stderr)
instantiated, decodeErr := NewInstantiatedDecoder(stderr).Decode()
waitErr := cmd.Wait()
return instantiated, errors.Join(decodeErr, waitErr)
}

6
instantiated_test.go
View File

@ -50,7 +50,7 @@ func TestDecodeInstantiated(t *testing.T) {
}
stderr := strings.NewReader(tc.out)
got, err := nixbuild.DecodeInstantiated(stderr)
got, err := nixbuild.NewInstantiatedDecoder(stderr).Decode()
if !errors.Is(err, tc.wantErr) {
t.Fatalf("DecodeInstantiated: error = %v, want %v", err, tc.wantErr)
}
@ -146,7 +146,7 @@ func BenchmarkDecodeInstantiated(b *testing.B) {
stderr := strings.NewReader(pluiedevPappardelleOut)
var v []string
for i := 0; i < b.N; i++ {
v, _ = nixbuild.DecodeInstantiated(stderr)
v, _ = nixbuild.NewInstantiatedDecoder(stderr).Decode()
runtime.KeepAlive(v)
}
}
@ -155,7 +155,7 @@ func BenchmarkDecodeInstantiatedCopy(b *testing.B) {
stderr := strings.NewReader(getchooAtlasOut)
var v []string
for i := 0; i < b.N; i++ {
v, _ = nixbuild.DecodeInstantiated(stderr)
v, _ = nixbuild.NewInstantiatedDecoder(stderr).Decode()
runtime.KeepAlive(v)
}
}