jschoubben
62a50ebcf8
Every command of a check ran over the shared Go build cache beneath a throwaway tmpfs layer of its own, so the digests, the vet, the unit tests and the integration compile of one ask each compiled every package again. With Isolation.CacheLayer a command writes into a layer on disk of its own and Isolated moves it into the ask's kept layer when it ends; later commands read the kept layer above the shared cache, which stays unchanged (ADR 0541 §2, ADR 0448 §3). Empty CacheLayer keeps today's throwaway layer. Ported from feat/try-speed S2 (issue 1921).
65 lines
2.4 KiB
Go
65 lines
2.4 KiB
Go
package buildstep
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import (
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"strings"
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"testing"
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)
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// The shared warm caches are read under a throwaway writable layer (novox/hq ADR 0448; issue 1309): a candidate's step
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// writes into them as a build does, and nothing it writes outlives it or reaches a later build; only a trunk build
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// writes them.
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func TestACandidatesStepWritesTheCachesOnlyIntoAThrowawayLayer(t *testing.T) {
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fixedSystem(t)
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iso := Isolation{Workspace: "/w", Caches: []string{"/var/cache/go-build", "/var/cache/npm"}}
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argv, err := iso.Command("go", "test")
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if err != nil {
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t.Fatal(err)
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}
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for _, c := range iso.Caches {
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if !holds(argv, "--overlay-src", c, "--tmp-overlay", c) {
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t.Errorf("the cache %s is not under a throwaway layer: %v", c, argv)
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}
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if holds(argv, "--bind", c, c) {
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t.Errorf("a candidate's step writes the cache %s: %v", c, argv)
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}
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}
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iso.WriteCaches = true
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argv, _ = iso.Command("go", "build")
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for _, c := range iso.Caches {
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if !holds(argv, "--bind", c, c) || holds(argv, "--tmp-overlay", c) {
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t.Errorf("a trunk build does not write the cache %s: %v", c, argv)
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}
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}
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// 1921/S2: with a cache layer, a command reads the ask's kept layer above the shared cache and writes into a layer
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// on disk of the ask's own, never into the shared cache and never into a throwaway tmpfs.
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iso = Isolation{Workspace: "/w", Caches: []string{"/cache/gomod", "/cache/gobuild"}, CacheLayer: "/w/cachelayer"}
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argv, err = iso.Command("go", "vet")
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if err != nil {
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t.Fatal(err)
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}
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for i, c := range iso.Caches {
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if !holds(argv, "--overlay-src", c, "--overlay-src", keptLayer(iso.CacheLayer, i), "--overlay") {
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t.Errorf("the cache %s is not read beneath the ask's kept layer: %v", c, argv)
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}
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if up := overlayOf(argv, c); up == "" || !strings.HasPrefix(up, "/w/cachelayer/") {
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t.Errorf("the cache %s is written into %q, not a layer of the ask's own: %v", c, up, argv)
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}
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if holds(argv, "--tmp-overlay", c) || holds(argv, "--bind", c, c) {
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t.Errorf("the cache %s is thrown away or written: %v", c, argv)
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}
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}
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if _, err := (Isolation{Workspace: "/w", CacheLayer: "cachelayer"}).Command("go"); err == nil {
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t.Error("a relative cache layer was taken")
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}
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}
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// overlayOf answers the upper directory a command line gives the cache c, "" when it gives none.
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func overlayOf(argv []string, c string) string {
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for i := 0; i+3 < len(argv); i++ {
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if argv[i] == "--overlay" && argv[i+3] == c {
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return argv[i+1]
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}
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}
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return ""
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}
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