internal/pkg: implement caching for directories

This works on any directories and should be robust against any bad state the artifact curing process might have failed at.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/pkg/dir_test.go

@@ -20,68 +20,136 @@ func TestFlatten(t *testing.T) {
 		sum     pkg.Checksum
 	}{
 		{"empty", fstest.MapFS{
-			".":          {Mode: 020000000700},
+			".":          {Mode: fs.ModeDir | 0700},
-			"checksum":   {Mode: 020000000700},
+			"checksum":   {Mode: fs.ModeDir | 0700},
-			"identifier": {Mode: 020000000700},
+			"identifier": {Mode: fs.ModeDir | 0700},
-			"work":       {Mode: 020000000700},
+			"work":       {Mode: fs.ModeDir | 0700},
 		}, []pkg.FlatEntry{
-			{Mode: 020000000700, Path: "."},
+			{Mode: fs.ModeDir | 0700, Path: "."},
-			{Mode: 020000000700, Path: "checksum"},
+			{Mode: fs.ModeDir | 0700, Path: "checksum"},
-			{Mode: 020000000700, Path: "identifier"},
+			{Mode: fs.ModeDir | 0700, Path: "identifier"},
-			{Mode: 020000000700, Path: "work"},
+			{Mode: fs.ModeDir | 0700, Path: "work"},
 		}, pkg.MustDecode("E4vEZKhCcL2gPZ2Tt59FS3lDng-d_2SKa2i5G_RbDfwGn6EemptFaGLPUDiOa94C")},
 
 		{"sample cache file", fstest.MapFS{
-			".": {Mode: 020000000700},
+			".": {Mode: fs.ModeDir | 0700},
 
-			"checksum": {Mode: 020000000700},
+			"checksum": {Mode: fs.ModeDir | 0700},
 			"checksum/vsAhtPNo4waRNOASwrQwcIPTqb3SBuJOXw2G4T1mNmVZM-wrQTRllmgXqcIIoRcX": {Mode: 0400, Data: []byte{0}},
 			"checksum/0bSFPu5Tnd-2Jj0Mv6co23PW2t3BmHc7eLFj9TgY3eIBg8zislo7xZYNBqovVLcq": {Mode: 0400, Data: []byte{0, 0, 0, 0, 0xad, 0xb, 0, 4, 0xfe, 0xfe, 0, 0, 0xfe, 0xca, 0, 0}},
 
-			"identifier": {Mode: 020000000700},
+			"identifier": {Mode: fs.ModeDir | 0700},
 			"identifier/vsAhtPNo4waRNOASwrQwcIPTqb3SBuJOXw2G4T1mNmVZM-wrQTRllmgXqcIIoRcX": {Mode: 0400, Data: []byte{0}},
 			"identifier/0bSFPu5Tnd-2Jj0Mv6co23PW2t3BmHc7eLFj9TgY3eIBg8zislo7xZYNBqovVLcq": {Mode: 0400, Data: []byte{0, 0, 0, 0, 0xad, 0xb, 0, 4, 0xfe, 0xfe, 0, 0, 0xfe, 0xca, 0, 0}},
 			"identifier/cafebabecafebabecafebabecafebabecafebabecafebabecafebabecafebabe": {Mode: 0400, Data: []byte{0, 0, 0, 0, 0xad, 0xb, 0, 4, 0xfe, 0xfe, 0, 0, 0xfe, 0xca, 0, 0}},
 			"identifier/deadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef": {Mode: 0400, Data: []byte{0, 0, 0, 0, 0xad, 0xb, 0, 4, 0xfe, 0xfe, 0, 0, 0xfe, 0xca, 0, 0}},
 
-			"work": {Mode: 020000000700},
+			"work": {Mode: fs.ModeDir | 0700},
 		}, []pkg.FlatEntry{
-			{Mode: 020000000700, Path: "."},
+			{Mode: fs.ModeDir | 0700, Path: "."},
 
-			{Mode: 020000000700, Path: "checksum"},
+			{Mode: fs.ModeDir | 0700, Path: "checksum"},
 			{Mode: 0400, Path: "checksum/0bSFPu5Tnd-2Jj0Mv6co23PW2t3BmHc7eLFj9TgY3eIBg8zislo7xZYNBqovVLcq", Data: []byte{0, 0, 0, 0, 0xad, 0xb, 0, 4, 0xfe, 0xfe, 0, 0, 0xfe, 0xca, 0, 0}},
 			{Mode: 0400, Path: "checksum/vsAhtPNo4waRNOASwrQwcIPTqb3SBuJOXw2G4T1mNmVZM-wrQTRllmgXqcIIoRcX", Data: []byte{0}},
 
-			{Mode: 020000000700, Path: "identifier"},
+			{Mode: fs.ModeDir | 0700, Path: "identifier"},
 			{Mode: 0400, Path: "identifier/0bSFPu5Tnd-2Jj0Mv6co23PW2t3BmHc7eLFj9TgY3eIBg8zislo7xZYNBqovVLcq", Data: []byte{0, 0, 0, 0, 0xad, 0xb, 0, 4, 0xfe, 0xfe, 0, 0, 0xfe, 0xca, 0, 0}},
 			{Mode: 0400, Path: "identifier/cafebabecafebabecafebabecafebabecafebabecafebabecafebabecafebabe", Data: []byte{0, 0, 0, 0, 0xad, 0xb, 0, 4, 0xfe, 0xfe, 0, 0, 0xfe, 0xca, 0, 0}},
 			{Mode: 0400, Path: "identifier/deadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef", Data: []byte{0, 0, 0, 0, 0xad, 0xb, 0, 4, 0xfe, 0xfe, 0, 0, 0xfe, 0xca, 0, 0}},
 			{Mode: 0400, Path: "identifier/vsAhtPNo4waRNOASwrQwcIPTqb3SBuJOXw2G4T1mNmVZM-wrQTRllmgXqcIIoRcX", Data: []byte{0}},
 
-			{Mode: 020000000700, Path: "work"},
+			{Mode: fs.ModeDir | 0700, Path: "work"},
 		}, pkg.MustDecode("G4u4W77C3u46oSAzwPTERKbS9h76iIvcd7Zl8p8Y6hTMb4_QGpH0Glg_DIJg-Usa")},
 
 		{"sample load or store", fstest.MapFS{
-			".": {Mode: 020000000700},
+			".": {Mode: fs.ModeDir | 0700},
 
-			"checksum": {Mode: 020000000700},
+			"checksum": {Mode: fs.ModeDir | 0700},
 			"checksum/fLYGIMHgN1louE-JzITJZJo2SDniPu-IHBXubtvQWFO-hXnDVKNuscV7-zlyr5fU": {Mode: 0400, Data: []byte("\x7f\xe1\x69\xa2\xdd\x63\x96\x26\x83\x79\x61\x8b\xf0\x3f\xd5\x16\x9a\x39\x3a\xdb\xcf\xb1\xbc\x8d\x33\xff\x75\xee\x62\x56\xa9\xf0\x27\xac\x13\x94\x69")},
 
-			"identifier": {Mode: 020000000700},
+			"identifier": {Mode: fs.ModeDir | 0700},
 			"identifier/fLYGIMHgN1louE-JzITJZJo2SDniPu-IHBXubtvQWFO-hXnDVKNuscV7-zlyr5fU": {Mode: 0400, Data: []byte("\x7f\xe1\x69\xa2\xdd\x63\x96\x26\x83\x79\x61\x8b\xf0\x3f\xd5\x16\x9a\x39\x3a\xdb\xcf\xb1\xbc\x8d\x33\xff\x75\xee\x62\x56\xa9\xf0\x27\xac\x13\x94\x69")},
 
-			"work": {Mode: 020000000700},
+			"work": {Mode: fs.ModeDir | 0700},
 		}, []pkg.FlatEntry{
-			{Mode: 020000000700, Path: "."},
+			{Mode: fs.ModeDir | 0700, Path: "."},
 
-			{Mode: 020000000700, Path: "checksum"},
+			{Mode: fs.ModeDir | 0700, Path: "checksum"},
 			{Mode: 0400, Path: "checksum/fLYGIMHgN1louE-JzITJZJo2SDniPu-IHBXubtvQWFO-hXnDVKNuscV7-zlyr5fU", Data: []byte("\x7f\xe1\x69\xa2\xdd\x63\x96\x26\x83\x79\x61\x8b\xf0\x3f\xd5\x16\x9a\x39\x3a\xdb\xcf\xb1\xbc\x8d\x33\xff\x75\xee\x62\x56\xa9\xf0\x27\xac\x13\x94\x69")},
 
-			{Mode: 020000000700, Path: "identifier"},
+			{Mode: fs.ModeDir | 0700, Path: "identifier"},
 			{Mode: 0400, Path: "identifier/fLYGIMHgN1louE-JzITJZJo2SDniPu-IHBXubtvQWFO-hXnDVKNuscV7-zlyr5fU", Data: []byte("\x7f\xe1\x69\xa2\xdd\x63\x96\x26\x83\x79\x61\x8b\xf0\x3f\xd5\x16\x9a\x39\x3a\xdb\xcf\xb1\xbc\x8d\x33\xff\x75\xee\x62\x56\xa9\xf0\x27\xac\x13\x94\x69")},
 
-			{Mode: 020000000700, Path: "work"},
+			{Mode: fs.ModeDir | 0700, Path: "work"},
 		}, pkg.MustDecode("bAJdeuI2cITlff5uIDbMKIiaW6zB-_XGinOMOMjNmltL3YAanXLiV64_jsXeQMXn")},
+
+		{"sample directory step simple", fstest.MapFS{
+			".": {Mode: fs.ModeDir | 0700},
+
+			"check": {Mode: 0400, Data: []byte{0, 0}},
+
+			"lib":            {Mode: fs.ModeDir | 0700},
+			"lib/libedac.so": {Mode: fs.ModeSymlink | 0777, Data: []byte("/proc/nonexistent/libedac.so")},
+
+			"lib/pkgconfig": {Mode: fs.ModeDir | 0700},
+		}, []pkg.FlatEntry{
+			{Mode: fs.ModeDir | 0700, Path: "."},
+
+			{Mode: 0400, Path: "check", Data: []byte{0x0, 0x0}},
+
+			{Mode: fs.ModeDir | 0700, Path: "lib"},
+			{Mode: fs.ModeSymlink | 0777, Path: "lib/libedac.so", Data: []byte("/proc/nonexistent/libedac.so")},
+
+			{Mode: fs.ModeDir | 0700, Path: "lib/pkgconfig"},
+		}, pkg.MustDecode("1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP")},
+
+		{"sample directory step garbage", fstest.MapFS{
+			".": {Mode: fs.ModeDir | 0700},
+
+			"lib":       {Mode: fs.ModeDir | 0500},
+			"lib/check": {Mode: 0400, Data: []byte{}},
+
+			"lib/pkgconfig": {Mode: fs.ModeDir | 0500},
+		}, []pkg.FlatEntry{
+			{Mode: fs.ModeDir | 0700, Path: "."},
+
+			{Mode: fs.ModeDir | 0500, Path: "lib"},
+			{Mode: 0400, Path: "lib/check", Data: []byte{}},
+
+			{Mode: fs.ModeDir | 0500, Path: "lib/pkgconfig"},
+		}, pkg.MustDecode("GbjlYMcHQANdfwL6qNGopBF99IscPTvCy95HSH1_kIF3eKjFDSLP0_iUUT0z8hiw")},
+
+		{"sample directory", fstest.MapFS{
+			".": {Mode: fs.ModeDir | 0700},
+
+			"checksum": {Mode: fs.ModeDir | 0700},
+			"checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP":                {Mode: fs.ModeDir | 0700},
+			"checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/check":          {Mode: 0400, Data: []byte{0, 0}},
+			"checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/lib":            {Mode: fs.ModeDir | 0700},
+			"checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/lib/pkgconfig":  {Mode: fs.ModeDir | 0700},
+			"checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/lib/libedac.so": {Mode: 01000000777, Data: []byte("/proc/nonexistent/libedac.so")},
+
+			"identifier": {Mode: fs.ModeDir | 0700},
+			"identifier/HnySzeLQvSBZuTUcvfmLEX_OmH4yJWWH788NxuLuv7kVn8_uPM6Ks4rqFWM2NZJY": {Mode: 01000000777, Data: []byte("../checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP")},
+			"identifier/Zx5ZG9BAwegNT3zQwCySuI2ktCXxNgxirkGLFjW4FW06PtojYVaCdtEw8yuntPLa": {Mode: 01000000777, Data: []byte("../checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP")},
+
+			"work": {Mode: fs.ModeDir | 0700},
+		}, []pkg.FlatEntry{
+			{Mode: fs.ModeDir | 0700, Path: "."},
+
+			{Mode: fs.ModeDir | 0700, Path: "checksum"},
+			{Mode: fs.ModeDir | 0700, Path: "checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP"},
+			{Mode: 0400, Path: "checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/check", Data: []byte{0, 0}},
+			{Mode: fs.ModeDir | 0700, Path: "checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/lib"},
+			{Mode: fs.ModeSymlink | 0777, Path: "checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/lib/libedac.so", Data: []byte("/proc/nonexistent/libedac.so")},
+			{Mode: fs.ModeDir | 0700, Path: "checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/lib/pkgconfig"},
+
+			{Mode: fs.ModeDir | 0700, Path: "identifier"},
+			{Mode: fs.ModeSymlink | 0777, Path: "identifier/HnySzeLQvSBZuTUcvfmLEX_OmH4yJWWH788NxuLuv7kVn8_uPM6Ks4rqFWM2NZJY", Data: []byte("../checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP")},
+			{Mode: fs.ModeSymlink | 0777, Path: "identifier/Zx5ZG9BAwegNT3zQwCySuI2ktCXxNgxirkGLFjW4FW06PtojYVaCdtEw8yuntPLa", Data: []byte("../checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP")},
+
+			{Mode: fs.ModeDir | 0700, Path: "work"},
+		}, pkg.MustDecode("N7dntFYbOq9V4iC-rjAQ-By6ofPIQVZkA8V0r0G07M_sdB7Zh42Ttrspsc38ioYa")},
 	}
 	for _, tc := range testCases {
 		t.Run(tc.name, func(t *testing.T) {

internal/pkg/pkg.go

@@ -8,7 +8,10 @@ import (
 	"encoding/binary"
 	"errors"
 	"io"
+	"io/fs"
 	"os"
+	"path"
+	"path/filepath"
 	"slices"
 	"sync"
 
@@ -190,6 +193,100 @@ func (c *Cache) pathnameIdent(id *ID) *check.Absolute {
 	)
 }
 
+// Store looks up an identifier, and if it is not present, calls makeArtifact
+// with a private working directory and stores its result instead. An optional
+// checksum can be passed via the result buffer which is used to validate the
+// produced directory.
+func (c *Cache) Store(
+	id ID,
+	makeArtifact func(work *check.Absolute) error,
+	buf *Checksum,
+	validate bool,
+) (
+	pathname *check.Absolute,
+	store bool,
+	err error,
+) {
+	pathname = c.pathnameIdent(&id)
+	c.mu.Lock()
+	defer c.mu.Unlock()
+
+	_, err = os.Lstat(pathname.String())
+	if err == nil || !errors.Is(err, os.ErrNotExist) {
+		return
+	}
+	store = true
+
+	var (
+		workPathname    *check.Absolute
+		workPathnameRaw string
+	)
+	if workPathnameRaw, err = os.MkdirTemp(
+		c.base.Append(dirWork).String(),
+		path.Base(pathname.String()+".*"),
+	); err != nil {
+		return
+	} else if workPathname, err = check.NewAbs(workPathnameRaw); err != nil {
+		return
+	}
+	defer func() {
+		if err != nil {
+			chmodErr := filepath.WalkDir(workPathname.String(), func(path string, d fs.DirEntry, err error) error {
+				if err != nil {
+					return err
+				}
+				if d.IsDir() {
+					return os.Chmod(path, 0700)
+				}
+				return nil
+			})
+			removeErr := os.RemoveAll(workPathname.String())
+			if chmodErr != nil || removeErr != nil {
+				err = errors.Join(err, chmodErr, removeErr)
+			} else if errors.Is(err, os.ErrExist) {
+				// two artifacts may be backed by the same file
+				err = nil
+			}
+		}
+	}()
+	if err = os.Chmod(workPathname.String(), 0700); err != nil {
+		return
+	}
+
+	if err = makeArtifact(workPathname); err != nil {
+		return
+	}
+	var checksum Checksum
+	if checksum, err = HashDir(workPathname); err != nil {
+		return
+	}
+	if validate {
+		if checksum != *buf {
+			err = &ChecksumMismatchError{checksum, *buf}
+			return
+		}
+	} else {
+		*buf = checksum
+	}
+
+	checksumPathname := c.pathname(&checksum)
+	if err = os.Rename(
+		workPathname.String(),
+		checksumPathname.String(),
+	); err != nil {
+		if !errors.Is(err, os.ErrExist) {
+			return
+		}
+	}
+	if linkErr := os.Symlink(
+		"../"+dirChecksum+"/"+path.Base(checksumPathname.String()),
+		pathname.String(),
+	); linkErr != nil {
+		err = linkErr
+	}
+	return
+}
+
 // storeFile stores the contents of a [File]. An optional checksum can be
 // passed via the result buffer which is used to validate the submitted data.
 //

internal/pkg/pkg_test.go

@@ -3,6 +3,7 @@ package pkg_test
 import (
 	"bytes"
 	"crypto/sha512"
+	"encoding/binary"
 	"io/fs"
 	"net/http"
 	"os"
@@ -303,6 +304,158 @@ func TestCache(t *testing.T) {
 				t.Fatalf("LoadFile: error = %#v, want %#v", err, wantErrNonexistentZero)
 			}
 		}, pkg.MustDecode("G4u4W77C3u46oSAzwPTERKbS9h76iIvcd7Zl8p8Y6hTMb4_QGpH0Glg_DIJg-Usa")},
+
+		{"directory", nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
+			id := pkg.KindTar.Ident(
+				binary.LittleEndian.AppendUint64(nil, 1),
+				stubArtifact{pkg.KindHTTP, testdataChecksum},
+			)
+			makeSample := func(work *check.Absolute) error {
+				if err := os.WriteFile(
+					work.Append("check").String(),
+					[]byte{0, 0},
+					0400,
+				); err != nil {
+					return err
+				}
+
+				if err := os.MkdirAll(work.Append(
+					"lib",
+					"pkgconfig",
+				).String(), 0700); err != nil {
+					return err
+				}
+
+				return os.Symlink(
+					"/proc/nonexistent/libedac.so",
+					work.Append(
+						"lib",
+						"libedac.so",
+					).String(),
+				)
+			}
+			wantChecksum := pkg.MustDecode(
+				"1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP",
+			)
+			wantPathname := base.Append(
+				"identifier",
+				pkg.Encode(id),
+			)
+
+			if pathname, store, err := c.Store(
+				id,
+				makeSample,
+				&wantChecksum,
+				true,
+			); err != nil {
+				t.Fatalf("Store: error = %v", err)
+			} else if !store {
+				t.Fatal("Store did not store nonpresent entry")
+			} else if !pathname.Is(wantPathname) {
+				t.Fatalf("Store: pathname = %q, want %q", pathname, wantPathname)
+			}
+
+			// check lookup
+			if pathname, store, err := c.Store(
+				id,
+				nil,
+				&wantChecksum,
+				true,
+			); err != nil {
+				t.Fatalf("Store: error = %v", err)
+			} else if store {
+				t.Fatal("Store stored over present entry")
+			} else if !pathname.Is(wantPathname) {
+				t.Fatalf("Store: pathname = %q, want %q", pathname, wantPathname)
+			}
+
+			// check exist
+			id0 := pkg.KindTar.Ident(
+				binary.LittleEndian.AppendUint64(nil, 1),
+				stubArtifact{pkg.KindHTTP, pkg.ID{}},
+			)
+			wantPathname0 := base.Append(
+				"identifier",
+				pkg.Encode(id0),
+			)
+			if pathname, store, err := c.Store(
+				id0,
+				makeSample,
+				&wantChecksum,
+				true,
+			); err != nil {
+				t.Fatalf("Store: error = %v", err)
+			} else if !store {
+				t.Fatal("Store did not store nonpresent entry")
+			} else if !pathname.Is(wantPathname0) {
+				t.Fatalf("Store: pathname = %q, want %q", pathname, wantPathname0)
+			}
+
+			var wantErrMakeGarbage error
+			makeGarbage := func(work *check.Absolute) error {
+				mode := fs.FileMode(0)
+				if wantErrMakeGarbage == nil {
+					mode = 0500
+				}
+
+				if err := os.MkdirAll(work.Append(
+					"lib",
+					"pkgconfig",
+				).String(), 0700); err != nil {
+					return err
+				}
+
+				if err := os.WriteFile(work.Append(
+					"lib",
+					"check",
+				).String(), nil, 0400&mode); err != nil {
+					return err
+				}
+
+				if err := os.Chmod(work.Append(
+					"lib",
+					"pkgconfig",
+				).String(), 0500&mode); err != nil {
+					return err
+				}
+				if err := os.Chmod(work.Append(
+					"lib",
+				).String(), 0500&mode); err != nil {
+					return err
+				}
+
+				return wantErrMakeGarbage
+			}
+
+			// check makeArtifact fault
+			wantErrMakeGarbage = stub.UniqueError(0xcafe)
+			if _, store, err := c.Store(
+				pkg.ID{},
+				makeGarbage,
+				nil,
+				false,
+			); !reflect.DeepEqual(err, wantErrMakeGarbage) {
+				t.Fatalf("Store: error = %#v, want %#v", err, wantErrMakeGarbage)
+			} else if !store {
+				t.Fatal("Store did not store nonpresent entry")
+			}
+
+			// checksum mismatch
+			wantErrMakeGarbage = nil
+			wantErrMismatch := &pkg.ChecksumMismatchError{
+				Got: pkg.MustDecode("GbjlYMcHQANdfwL6qNGopBF99IscPTvCy95HSH1_kIF3eKjFDSLP0_iUUT0z8hiw"),
+			}
+			if _, store, err := c.Store(
+				pkg.ID{},
+				makeGarbage,
+				new(pkg.Checksum),
+				true,
+			); !reflect.DeepEqual(err, wantErrMismatch) {
+				t.Fatalf("Store: error = %v, want %v", err, wantErrMismatch)
+			} else if !store {
+				t.Fatal("Store did not store nonpresent entry")
+			}
+		}, pkg.MustDecode("N7dntFYbOq9V4iC-rjAQ-By6ofPIQVZkA8V0r0G07M_sdB7Zh42Ttrspsc38ioYa")},
 	}
 	checkWithCache(t, testCases)
 }