package pkg_test

import (
	"bytes"
	"io/fs"
	"reflect"
	"testing"
	"testing/fstest"

	"hakurei.app/internal/pkg"
)

func TestFlatten(t *testing.T) {
	t.Parallel()

	testCases := []struct {
		name    string
		fsys    fs.FS
		entries []pkg.FlatEntry
		sum     pkg.Checksum
		err     error
	}{
		{"bad type", fstest.MapFS{
			".":       {Mode: fs.ModeDir | 0700},
			"invalid": {Mode: fs.ModeCharDevice | 0400},
		}, nil, pkg.Checksum{}, pkg.InvalidFileModeError(
			fs.ModeCharDevice | 0400,
		)},

		{"empty", fstest.MapFS{
			".":          {Mode: fs.ModeDir | 0700},
			"checksum":   {Mode: fs.ModeDir | 0700},
			"identifier": {Mode: fs.ModeDir | 0700},
			"work":       {Mode: fs.ModeDir | 0700},
		}, []pkg.FlatEntry{
			{Mode: fs.ModeDir | 0700, Path: "."},
			{Mode: fs.ModeDir | 0700, Path: "checksum"},
			{Mode: fs.ModeDir | 0700, Path: "identifier"},
			{Mode: fs.ModeDir | 0700, Path: "work"},
		}, pkg.MustDecode("E4vEZKhCcL2gPZ2Tt59FS3lDng-d_2SKa2i5G_RbDfwGn6EemptFaGLPUDiOa94C"), nil},

		{"sample cache file", fstest.MapFS{
			".": {Mode: fs.ModeDir | 0700},

			"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: fs.ModeDir | 0700},
			"identifier/vsAhtPNo4waRNOASwrQwcIPTqb3SBuJOXw2G4T1mNmVZM-wrQTRllmgXqcIIoRcX": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/vsAhtPNo4waRNOASwrQwcIPTqb3SBuJOXw2G4T1mNmVZM-wrQTRllmgXqcIIoRcX")},
			"identifier/0bSFPu5Tnd-2Jj0Mv6co23PW2t3BmHc7eLFj9TgY3eIBg8zislo7xZYNBqovVLcq": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/0bSFPu5Tnd-2Jj0Mv6co23PW2t3BmHc7eLFj9TgY3eIBg8zislo7xZYNBqovVLcq")},
			"identifier/cafebabecafebabecafebabecafebabecafebabecafebabecafebabecafebabe": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/0bSFPu5Tnd-2Jj0Mv6co23PW2t3BmHc7eLFj9TgY3eIBg8zislo7xZYNBqovVLcq")},
			"identifier/deadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/0bSFPu5Tnd-2Jj0Mv6co23PW2t3BmHc7eLFj9TgY3eIBg8zislo7xZYNBqovVLcq")},

			"work": {Mode: fs.ModeDir | 0700},
		}, []pkg.FlatEntry{
			{Mode: fs.ModeDir | 0700, Path: "."},

			{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: fs.ModeDir | 0700, Path: "identifier"},
			{Mode: fs.ModeSymlink | 0777, Path: "identifier/0bSFPu5Tnd-2Jj0Mv6co23PW2t3BmHc7eLFj9TgY3eIBg8zislo7xZYNBqovVLcq", Data: []byte("../checksum/0bSFPu5Tnd-2Jj0Mv6co23PW2t3BmHc7eLFj9TgY3eIBg8zislo7xZYNBqovVLcq")},
			{Mode: fs.ModeSymlink | 0777, Path: "identifier/cafebabecafebabecafebabecafebabecafebabecafebabecafebabecafebabe", Data: []byte("../checksum/0bSFPu5Tnd-2Jj0Mv6co23PW2t3BmHc7eLFj9TgY3eIBg8zislo7xZYNBqovVLcq")},
			{Mode: fs.ModeSymlink | 0777, Path: "identifier/deadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef", Data: []byte("../checksum/0bSFPu5Tnd-2Jj0Mv6co23PW2t3BmHc7eLFj9TgY3eIBg8zislo7xZYNBqovVLcq")},
			{Mode: fs.ModeSymlink | 0777, Path: "identifier/vsAhtPNo4waRNOASwrQwcIPTqb3SBuJOXw2G4T1mNmVZM-wrQTRllmgXqcIIoRcX", Data: []byte("../checksum/vsAhtPNo4waRNOASwrQwcIPTqb3SBuJOXw2G4T1mNmVZM-wrQTRllmgXqcIIoRcX")},

			{Mode: fs.ModeDir | 0700, Path: "work"},
		}, pkg.MustDecode("St9rlE-mGZ5gXwiv_hzQ_B8bZP-UUvSNmf4nHUZzCMOumb6hKnheZSe0dmnuc4Q2"), nil},

		{"sample http get cure", fstest.MapFS{
			".": {Mode: fs.ModeDir | 0700},

			"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: fs.ModeDir | 0700},
			"identifier/00BNNr-PsNMtowTpEG86ZeI7eQKoD-pjSCPAal1e5MYqr_N7FLpyXKdXLXE8WEBF": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/fLYGIMHgN1louE-JzITJZJo2SDniPu-IHBXubtvQWFO-hXnDVKNuscV7-zlyr5fU")},

			"work": {Mode: fs.ModeDir | 0700},
		}, []pkg.FlatEntry{
			{Mode: fs.ModeDir | 0700, Path: "."},

			{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: fs.ModeDir | 0700, Path: "identifier"},
			{Mode: fs.ModeSymlink | 0777, Path: "identifier/00BNNr-PsNMtowTpEG86ZeI7eQKoD-pjSCPAal1e5MYqr_N7FLpyXKdXLXE8WEBF", Data: []byte("../checksum/fLYGIMHgN1louE-JzITJZJo2SDniPu-IHBXubtvQWFO-hXnDVKNuscV7-zlyr5fU")},

			{Mode: fs.ModeDir | 0700, Path: "work"},
		}, pkg.MustDecode("KkdL8x2a84V8iYZop5jSTyba54xSgf_NZ1R0c4nSp9xTdk3SK_zUKGhNJ2uK8wMY"), nil},

		{"sample directory step simple", fstest.MapFS{
			".": {Mode: fs.ModeDir | 0500},

			"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 | 0500, Path: "."},

			{Mode: 0400, Path: "check", Data: []byte{0, 0}},

			{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("qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b"), nil},

		{"sample directory step garbage", fstest.MapFS{
			".": {Mode: fs.ModeDir | 0500},

			"lib":       {Mode: fs.ModeDir | 0500},
			"lib/check": {Mode: 0400, Data: []byte{}},

			"lib/pkgconfig": {Mode: fs.ModeDir | 0500},
		}, []pkg.FlatEntry{
			{Mode: fs.ModeDir | 0500, Path: "."},

			{Mode: fs.ModeDir | 0500, Path: "lib"},
			{Mode: 0400, Path: "lib/check", Data: []byte{}},

			{Mode: fs.ModeDir | 0500, Path: "lib/pkgconfig"},
		}, pkg.MustDecode("CUx-3hSbTWPsbMfDhgalG4Ni_GmR9TnVX8F99tY_P5GtkYvczg9RrF5zO0jX9XYT"), nil},

		{"sample directory", fstest.MapFS{
			".": {Mode: fs.ModeDir | 0700},

			"checksum": {Mode: fs.ModeDir | 0700},
			"checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b":                {Mode: fs.ModeDir | 0500},
			"checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b/check":          {Mode: 0400, Data: []byte{0, 0}},
			"checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b/lib":            {Mode: fs.ModeDir | 0700},
			"checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b/lib/pkgconfig":  {Mode: fs.ModeDir | 0700},
			"checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b/lib/libedac.so": {Mode: fs.ModeSymlink | 0777, Data: []byte("/proc/nonexistent/libedac.so")},

			"identifier": {Mode: fs.ModeDir | 0700},
			"identifier/HnySzeLQvSBZuTUcvfmLEX_OmH4yJWWH788NxuLuv7kVn8_uPM6Ks4rqFWM2NZJY": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b")},
			"identifier/Zx5ZG9BAwegNT3zQwCySuI2ktCXxNgxirkGLFjW4FW06PtojYVaCdtEw8yuntPLa": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b")},

			"work": {Mode: fs.ModeDir | 0700},
		}, []pkg.FlatEntry{
			{Mode: fs.ModeDir | 0700, Path: "."},

			{Mode: fs.ModeDir | 0700, Path: "checksum"},
			{Mode: fs.ModeDir | 0500, Path: "checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b"},
			{Mode: 0400, Path: "checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b/check", Data: []byte{0, 0}},
			{Mode: fs.ModeDir | 0700, Path: "checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b/lib"},
			{Mode: fs.ModeSymlink | 0777, Path: "checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b/lib/libedac.so", Data: []byte("/proc/nonexistent/libedac.so")},
			{Mode: fs.ModeDir | 0700, Path: "checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b/lib/pkgconfig"},

			{Mode: fs.ModeDir | 0700, Path: "identifier"},
			{Mode: fs.ModeSymlink | 0777, Path: "identifier/HnySzeLQvSBZuTUcvfmLEX_OmH4yJWWH788NxuLuv7kVn8_uPM6Ks4rqFWM2NZJY", Data: []byte("../checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b")},
			{Mode: fs.ModeSymlink | 0777, Path: "identifier/Zx5ZG9BAwegNT3zQwCySuI2ktCXxNgxirkGLFjW4FW06PtojYVaCdtEw8yuntPLa", Data: []byte("../checksum/qRN6in76LndiiOZJheHkwyW8UT1N5-f-bXvHfDvwrMw2fSkOoZdh8pWE1qhLk65b")},

			{Mode: fs.ModeDir | 0700, Path: "work"},
		}, pkg.MustDecode("WVpvsVqVKg9Nsh744x57h51AuWUoUR2nnh8Md-EYBQpk6ziyTuUn6PLtF2e0Eu_d"), nil},

		{"sample tar step unpack", fstest.MapFS{
			".": {Mode: fs.ModeDir | 0500},

			"checksum": {Mode: fs.ModeDir | 0500},
			"checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP":                {Mode: fs.ModeDir | 0500},
			"checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/check":          {Mode: 0400, Data: []byte{0, 0}},
			"checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/lib":            {Mode: fs.ModeDir | 0500},
			"checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/lib/pkgconfig":  {Mode: fs.ModeDir | 0500},
			"checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/lib/libedac.so": {Mode: fs.ModeSymlink | 0777, Data: []byte("/proc/nonexistent/libedac.so")},

			"identifier": {Mode: fs.ModeDir | 0500},
			"identifier/HnySzeLQvSBZuTUcvfmLEX_OmH4yJWWH788NxuLuv7kVn8_uPM6Ks4rqFWM2NZJY": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP")},
			"identifier/Zx5ZG9BAwegNT3zQwCySuI2ktCXxNgxirkGLFjW4FW06PtojYVaCdtEw8yuntPLa": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP")},

			"work": {Mode: fs.ModeDir | 0500},
		}, []pkg.FlatEntry{
			{Mode: fs.ModeDir | 0500, Path: "."},

			{Mode: fs.ModeDir | 0500, Path: "checksum"},
			{Mode: fs.ModeDir | 0500, Path: "checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP"},
			{Mode: 0400, Path: "checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/check", Data: []byte{0, 0}},
			{Mode: fs.ModeDir | 0500, 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 | 0500, Path: "checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/lib/pkgconfig"},

			{Mode: fs.ModeDir | 0500, 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 | 0500, Path: "work"},
		}, pkg.MustDecode("cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM"), nil},

		{"sample tar", fstest.MapFS{
			".": {Mode: fs.ModeDir | 0700},

			"checksum": {Mode: fs.ModeDir | 0700},
			"checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM":                                                                                          {Mode: fs.ModeDir | 0500},
			"checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/checksum":                                                                                 {Mode: fs.ModeDir | 0500},
			"checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP":                {Mode: fs.ModeDir | 0500},
			"checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/check":          {Mode: 0400, Data: []byte{0, 0}},
			"checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/lib":            {Mode: fs.ModeDir | 0500},
			"checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/lib/libedac.so": {Mode: fs.ModeSymlink | 0777, Data: []byte("/proc/nonexistent/libedac.so")},
			"checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/lib/pkgconfig":  {Mode: fs.ModeDir | 0500},
			"checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/identifier":                                                                               {Mode: fs.ModeDir | 0500},
			"checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/identifier/HnySzeLQvSBZuTUcvfmLEX_OmH4yJWWH788NxuLuv7kVn8_uPM6Ks4rqFWM2NZJY":              {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP")},
			"checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/identifier/Zx5ZG9BAwegNT3zQwCySuI2ktCXxNgxirkGLFjW4FW06PtojYVaCdtEw8yuntPLa":              {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP")},
			"checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/work":                                                                                     {Mode: fs.ModeDir | 0500},

			"identifier": {Mode: fs.ModeDir | 0700},
			"identifier/5-NfJKBlUgVhAP_JeCjjo1UxF72x8QVMgeKPWd8s0J-RYvRJy6veTQDwmgxOvr6v": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM")},
			"identifier/VWakDFDSjNMvdzwxG0Y1IKFdCzExgiQnjg-vv2srsZObwh-5WOJx7H5HtCgDXHcq": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM")},

			"temp": {Mode: fs.ModeDir | 0700},
			"work": {Mode: fs.ModeDir | 0700},
		}, []pkg.FlatEntry{
			{Mode: fs.ModeDir | 0700, Path: "."},

			{Mode: fs.ModeDir | 0700, Path: "checksum"},
			{Mode: fs.ModeDir | 0500, Path: "checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM"},
			{Mode: fs.ModeDir | 0500, Path: "checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/checksum"},
			{Mode: fs.ModeDir | 0500, Path: "checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP"},
			{Mode: 0400, Path: "checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/check", Data: []byte{0, 0}},
			{Mode: fs.ModeDir | 0500, Path: "checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/lib"},
			{Mode: fs.ModeSymlink | 0777, Path: "checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/lib/libedac.so", Data: []byte("/proc/nonexistent/libedac.so")},
			{Mode: fs.ModeDir | 0500, Path: "checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP/lib/pkgconfig"},
			{Mode: fs.ModeDir | 0500, Path: "checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/identifier"},
			{Mode: fs.ModeSymlink | 0777, Path: "checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/identifier/HnySzeLQvSBZuTUcvfmLEX_OmH4yJWWH788NxuLuv7kVn8_uPM6Ks4rqFWM2NZJY", Data: []byte("../checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP")},
			{Mode: fs.ModeSymlink | 0777, Path: "checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/identifier/Zx5ZG9BAwegNT3zQwCySuI2ktCXxNgxirkGLFjW4FW06PtojYVaCdtEw8yuntPLa", Data: []byte("../checksum/1TL00Qb8dcqayX7wTO8WNaraHvY6b-KCsctLDTrb64QBCmxj_-byK1HdIUwMaFEP")},
			{Mode: fs.ModeDir | 0500, Path: "checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM/work"},

			{Mode: fs.ModeDir | 0700, Path: "identifier"},
			{Mode: fs.ModeSymlink | 0777, Path: "identifier/5-NfJKBlUgVhAP_JeCjjo1UxF72x8QVMgeKPWd8s0J-RYvRJy6veTQDwmgxOvr6v", Data: []byte("../checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM")},
			{Mode: fs.ModeSymlink | 0777, Path: "identifier/VWakDFDSjNMvdzwxG0Y1IKFdCzExgiQnjg-vv2srsZObwh-5WOJx7H5HtCgDXHcq", Data: []byte("../checksum/cTw0h3AmYe7XudSoyEMByduYXqGi-N5ZkTZ0t9K5elsu3i_jNIVF5T08KR1roBFM")},

			{Mode: fs.ModeDir | 0700, Path: "temp"},
			{Mode: fs.ModeDir | 0700, Path: "work"},
		}, pkg.MustDecode("nnOiyjjjvgZChsGtO4rA1JHckwYBBbxwNfecPJp62OFP6aoYUxHQ5UtYsrDpnwan"), nil},

		{"sample tar expand step unpack", fstest.MapFS{
			".": {Mode: fs.ModeDir | 0500},

			"libedac.so": {Mode: fs.ModeSymlink | 0777, Data: []byte("/proc/nonexistent/libedac.so")},
		}, []pkg.FlatEntry{
			{Mode: fs.ModeDir | 0500, Path: "."},

			{Mode: fs.ModeSymlink | 0777, Path: "libedac.so", Data: []byte("/proc/nonexistent/libedac.so")},
		}, pkg.MustDecode("CH3AiUrCCcVOjOYLaMKKK1Da78989JtfHeIsxMzWOQFiN4mrCLDYpoDxLWqJWCUN"), nil},

		{"sample tar expand", fstest.MapFS{
			".": {Mode: fs.ModeDir | 0700},

			"checksum": {Mode: fs.ModeDir | 0700},
			"checksum/CH3AiUrCCcVOjOYLaMKKK1Da78989JtfHeIsxMzWOQFiN4mrCLDYpoDxLWqJWCUN":            {Mode: fs.ModeDir | 0500},
			"checksum/CH3AiUrCCcVOjOYLaMKKK1Da78989JtfHeIsxMzWOQFiN4mrCLDYpoDxLWqJWCUN/libedac.so": {Mode: fs.ModeSymlink | 0777, Data: []byte("/proc/nonexistent/libedac.so")},

			"identifier": {Mode: fs.ModeDir | 0700},
			"identifier/VWakDFDSjNMvdzwxG0Y1IKFdCzExgiQnjg-vv2srsZObwh-5WOJx7H5HtCgDXHcq": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/CH3AiUrCCcVOjOYLaMKKK1Da78989JtfHeIsxMzWOQFiN4mrCLDYpoDxLWqJWCUN")},
			"identifier/v3z1m-ofUqJz4_rasXRlTw5NgKk63RLvd5JKBpDeiNaYiUKSGN5KJbJGJHMt7cTf": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/CH3AiUrCCcVOjOYLaMKKK1Da78989JtfHeIsxMzWOQFiN4mrCLDYpoDxLWqJWCUN")},

			"temp": {Mode: fs.ModeDir | 0700},
			"work": {Mode: fs.ModeDir | 0700},
		}, []pkg.FlatEntry{
			{Mode: fs.ModeDir | 0700, Path: "."},

			{Mode: fs.ModeDir | 0700, Path: "checksum"},
			{Mode: fs.ModeDir | 0500, Path: "checksum/CH3AiUrCCcVOjOYLaMKKK1Da78989JtfHeIsxMzWOQFiN4mrCLDYpoDxLWqJWCUN"},
			{Mode: fs.ModeSymlink | 0777, Path: "checksum/CH3AiUrCCcVOjOYLaMKKK1Da78989JtfHeIsxMzWOQFiN4mrCLDYpoDxLWqJWCUN/libedac.so", Data: []byte("/proc/nonexistent/libedac.so")},

			{Mode: fs.ModeDir | 0700, Path: "identifier"},
			{Mode: fs.ModeSymlink | 0777, Path: "identifier/VWakDFDSjNMvdzwxG0Y1IKFdCzExgiQnjg-vv2srsZObwh-5WOJx7H5HtCgDXHcq", Data: []byte("../checksum/CH3AiUrCCcVOjOYLaMKKK1Da78989JtfHeIsxMzWOQFiN4mrCLDYpoDxLWqJWCUN")},
			{Mode: fs.ModeSymlink | 0777, Path: "identifier/v3z1m-ofUqJz4_rasXRlTw5NgKk63RLvd5JKBpDeiNaYiUKSGN5KJbJGJHMt7cTf", Data: []byte("../checksum/CH3AiUrCCcVOjOYLaMKKK1Da78989JtfHeIsxMzWOQFiN4mrCLDYpoDxLWqJWCUN")},

			{Mode: fs.ModeDir | 0700, Path: "temp"},
			{Mode: fs.ModeDir | 0700, Path: "work"},
		}, pkg.MustDecode("bQVH19N7dX50SdQ6JNVYbFdDZV4t8IaM4dhxGvjACpdoEgJ2jZJfYKLH4ya7ZD_s"), nil},

		{"testtool", fstest.MapFS{
			".": {Mode: fs.ModeDir | 0500},

			"check": {Mode: 0400, Data: []byte{0}},
		}, []pkg.FlatEntry{
			{Mode: fs.ModeDir | 0500, Path: "."},

			{Mode: 0400, Path: "check", Data: []byte{0}},
		}, pkg.MustDecode("GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9"), nil},

		{"sample exec container", fstest.MapFS{
			".": {Mode: fs.ModeDir | 0700},

			"checksum": {Mode: fs.ModeDir | 0700},
			"checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9":       {Mode: fs.ModeDir | 0500},
			"checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9/check": {Mode: 0400, Data: []byte{0}},
			"checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU":       {Mode: fs.ModeDir | 0500},
			"checksum/OLBgp1GsljhM2TJ-sbHjaiH9txEUvgdDTAzHv2P24donTt6_529l-9Ua0vFImLlb":       {Mode: 0400, Data: []byte{}},

			"identifier": {Mode: fs.ModeDir | 0700},
			"identifier/LRxdkRYNKnZT6bKiu5W8ATeAAmq3n_5AAJkF6G0EpAOEloiZvADJBkfixgtgF1Z9": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9")},
			"identifier/_gAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/OLBgp1GsljhM2TJ-sbHjaiH9txEUvgdDTAzHv2P24donTt6_529l-9Ua0vFImLlb")},
			"identifier/cGvuAdKA2tThRa4w3ZI2c5S5TXDx4j2qvfFM7pzf7y5vBz7NisBV06ThBXw_97xK": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},

			"temp": {Mode: fs.ModeDir | 0700},
			"work": {Mode: fs.ModeDir | 0700},
		}, []pkg.FlatEntry{
			{Mode: fs.ModeDir | 0700, Path: "."},

			{Mode: fs.ModeDir | 0700, Path: "checksum"},
			{Mode: fs.ModeDir | 0500, Path: "checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9"},
			{Mode: 0400, Path: "checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9/check", Data: []byte{0}},
			{Mode: fs.ModeDir | 0500, Path: "checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU"},
			{Mode: 0400, Path: "checksum/OLBgp1GsljhM2TJ-sbHjaiH9txEUvgdDTAzHv2P24donTt6_529l-9Ua0vFImLlb", Data: []byte{}},

			{Mode: fs.ModeDir | 0700, Path: "identifier"},
			{Mode: fs.ModeSymlink | 0777, Path: "identifier/LRxdkRYNKnZT6bKiu5W8ATeAAmq3n_5AAJkF6G0EpAOEloiZvADJBkfixgtgF1Z9", Data: []byte("../checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9")},
			{Mode: fs.ModeSymlink | 0777, Path: "identifier/_gAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA", Data: []byte("../checksum/OLBgp1GsljhM2TJ-sbHjaiH9txEUvgdDTAzHv2P24donTt6_529l-9Ua0vFImLlb")},
			{Mode: fs.ModeSymlink | 0777, Path: "identifier/cGvuAdKA2tThRa4w3ZI2c5S5TXDx4j2qvfFM7pzf7y5vBz7NisBV06ThBXw_97xK", Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},

			{Mode: fs.ModeDir | 0700, Path: "temp"},
			{Mode: fs.ModeDir | 0700, Path: "work"},
		}, pkg.MustDecode("BQb5SCAo0Rw0YBGqjGemK1jH3jk0cgxAQ-JyeqVRqaqmEevJ3jtXNL8HB470XNnB"), nil},

		{"testtool net", fstest.MapFS{
			".": {Mode: fs.ModeDir | 0500},

			"check": {Mode: 0400, Data: []byte("net")},
		}, []pkg.FlatEntry{
			{Mode: fs.ModeDir | 0500, Path: "."},

			{Mode: 0400, Path: "check", Data: []byte("net")},
		}, pkg.MustDecode("a1F_i9PVQI4qMcoHgTQkORuyWLkC1GLIxOhDt2JpU1NGAxWc5VJzdlfRK-PYBh3W"), nil},

		{"sample exec net container", fstest.MapFS{
			".": {Mode: fs.ModeDir | 0700},

			"checksum": {Mode: fs.ModeDir | 0700},
			"checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU":       {Mode: fs.ModeDir | 0500},
			"checksum/OLBgp1GsljhM2TJ-sbHjaiH9txEUvgdDTAzHv2P24donTt6_529l-9Ua0vFImLlb":       {Mode: 0400, Data: []byte{}},
			"checksum/a1F_i9PVQI4qMcoHgTQkORuyWLkC1GLIxOhDt2JpU1NGAxWc5VJzdlfRK-PYBh3W":       {Mode: fs.ModeDir | 0500},
			"checksum/a1F_i9PVQI4qMcoHgTQkORuyWLkC1GLIxOhDt2JpU1NGAxWc5VJzdlfRK-PYBh3W/check": {Mode: 0400, Data: []byte("net")},

			"identifier": {Mode: fs.ModeDir | 0700},
			"identifier/_gAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/OLBgp1GsljhM2TJ-sbHjaiH9txEUvgdDTAzHv2P24donTt6_529l-9Ua0vFImLlb")},
			"identifier/TAspufRsG2I_TsxUUj2b7bUnCHgcVSdh6aOZpzL0W5Bjn4EZmOGzjofaOWd8J11H": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/a1F_i9PVQI4qMcoHgTQkORuyWLkC1GLIxOhDt2JpU1NGAxWc5VJzdlfRK-PYBh3W")},
			"identifier/cGvuAdKA2tThRa4w3ZI2c5S5TXDx4j2qvfFM7pzf7y5vBz7NisBV06ThBXw_97xK": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},

			"temp": {Mode: fs.ModeDir | 0700},
			"work": {Mode: fs.ModeDir | 0700},
		}, []pkg.FlatEntry{
			{Mode: fs.ModeDir | 0700, Path: "."},

			{Mode: fs.ModeDir | 0700, Path: "checksum"},
			{Mode: fs.ModeDir | 0500, Path: "checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU"},
			{Mode: 0400, Path: "checksum/OLBgp1GsljhM2TJ-sbHjaiH9txEUvgdDTAzHv2P24donTt6_529l-9Ua0vFImLlb", Data: []byte{}},
			{Mode: fs.ModeDir | 0500, Path: "checksum/a1F_i9PVQI4qMcoHgTQkORuyWLkC1GLIxOhDt2JpU1NGAxWc5VJzdlfRK-PYBh3W"},
			{Mode: 0400, Path: "checksum/a1F_i9PVQI4qMcoHgTQkORuyWLkC1GLIxOhDt2JpU1NGAxWc5VJzdlfRK-PYBh3W/check", Data: []byte("net")},

			{Mode: fs.ModeDir | 0700, Path: "identifier"},
			{Mode: fs.ModeSymlink | 0777, Path: "identifier/TAspufRsG2I_TsxUUj2b7bUnCHgcVSdh6aOZpzL0W5Bjn4EZmOGzjofaOWd8J11H", Data: []byte("../checksum/a1F_i9PVQI4qMcoHgTQkORuyWLkC1GLIxOhDt2JpU1NGAxWc5VJzdlfRK-PYBh3W")},
			{Mode: fs.ModeSymlink | 0777, Path: "identifier/_gAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA", Data: []byte("../checksum/OLBgp1GsljhM2TJ-sbHjaiH9txEUvgdDTAzHv2P24donTt6_529l-9Ua0vFImLlb")},
			{Mode: fs.ModeSymlink | 0777, Path: "identifier/cGvuAdKA2tThRa4w3ZI2c5S5TXDx4j2qvfFM7pzf7y5vBz7NisBV06ThBXw_97xK", Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},

			{Mode: fs.ModeDir | 0700, Path: "temp"},
			{Mode: fs.ModeDir | 0700, Path: "work"},
		}, pkg.MustDecode("hJ7nCMLea_09Z7Fi4ALXOgubMNwK7C61THdQobpQJhH3tnr7PJ86aY98Mte3rBje"), nil},

		{"sample exec container overlay root", fstest.MapFS{
			".": {Mode: fs.ModeDir | 0700},

			"checksum": {Mode: fs.ModeDir | 0700},
			"checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9":       {Mode: fs.ModeDir | 0500},
			"checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9/check": {Mode: 0400, Data: []byte{0}},
			"checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU":       {Mode: fs.ModeDir | 0500},

			"identifier": {Mode: fs.ModeDir | 0700},
			"identifier/UB9HPeMgMPJf3Ut4jLWwnCtu_P3Lr29i8Erf084bHe8jjzBMKPDNxQ3RMrirkH6H": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9")},
			"identifier/cGvuAdKA2tThRa4w3ZI2c5S5TXDx4j2qvfFM7pzf7y5vBz7NisBV06ThBXw_97xK": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},

			"temp": {Mode: fs.ModeDir | 0700},
			"work": {Mode: fs.ModeDir | 0700},
		}, []pkg.FlatEntry{
			{Mode: fs.ModeDir | 0700, Path: "."},

			{Mode: fs.ModeDir | 0700, Path: "checksum"},
			{Mode: fs.ModeDir | 0500, Path: "checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9"},
			{Mode: 0400, Path: "checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9/check", Data: []byte{0}},
			{Mode: fs.ModeDir | 0500, Path: "checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU"},

			{Mode: fs.ModeDir | 0700, Path: "identifier"},
			{Mode: fs.ModeSymlink | 0777, Path: "identifier/UB9HPeMgMPJf3Ut4jLWwnCtu_P3Lr29i8Erf084bHe8jjzBMKPDNxQ3RMrirkH6H", Data: []byte("../checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9")},
			{Mode: fs.ModeSymlink | 0777, Path: "identifier/cGvuAdKA2tThRa4w3ZI2c5S5TXDx4j2qvfFM7pzf7y5vBz7NisBV06ThBXw_97xK", Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},

			{Mode: fs.ModeDir | 0700, Path: "temp"},
			{Mode: fs.ModeDir | 0700, Path: "work"},
		}, pkg.MustDecode("PAZyVTxxROg4eCQX3yKuiIlB1k9VFXmtvvyy7QxoqaFhYwGZpT4wYec4R2dTtfyh"), nil},

		{"sample exec container overlay work", fstest.MapFS{
			".": {Mode: fs.ModeDir | 0700},

			"checksum": {Mode: fs.ModeDir | 0700},
			"checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9":       {Mode: fs.ModeDir | 0500},
			"checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9/check": {Mode: 0400, Data: []byte{0}},
			"checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU":       {Mode: fs.ModeDir | 0500},

			"identifier": {Mode: fs.ModeDir | 0700},
			"identifier/Fud5ldJfpsgLt-rkLWrLO-aVYhQm-esTswetjxydPeQMK4jHNJ_1fGHVahaiCZ9y": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9")},
			"identifier/cGvuAdKA2tThRa4w3ZI2c5S5TXDx4j2qvfFM7pzf7y5vBz7NisBV06ThBXw_97xK": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},

			"temp": {Mode: fs.ModeDir | 0700},
			"work": {Mode: fs.ModeDir | 0700},
		}, []pkg.FlatEntry{
			{Mode: fs.ModeDir | 0700, Path: "."},

			{Mode: fs.ModeDir | 0700, Path: "checksum"},
			{Mode: fs.ModeDir | 0500, Path: "checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9"},
			{Mode: 0400, Path: "checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9/check", Data: []byte{0}},
			{Mode: fs.ModeDir | 0500, Path: "checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU"},

			{Mode: fs.ModeDir | 0700, Path: "identifier"},
			{Mode: fs.ModeSymlink | 0777, Path: "identifier/Fud5ldJfpsgLt-rkLWrLO-aVYhQm-esTswetjxydPeQMK4jHNJ_1fGHVahaiCZ9y", Data: []byte("../checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9")},
			{Mode: fs.ModeSymlink | 0777, Path: "identifier/cGvuAdKA2tThRa4w3ZI2c5S5TXDx4j2qvfFM7pzf7y5vBz7NisBV06ThBXw_97xK", Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},

			{Mode: fs.ModeDir | 0700, Path: "temp"},
			{Mode: fs.ModeDir | 0700, Path: "work"},
		}, pkg.MustDecode("uMZyWOQGjhI1oNKfJyw8I6EtUmWkOsZNeUEZLjy1lmkAV7cR1hmOKsOlXs4RkuEC"), nil},

		{"sample exec container multiple layers", fstest.MapFS{
			".": {Mode: fs.ModeDir | 0700},

			"checksum": {Mode: fs.ModeDir | 0700},
			"checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9":       {Mode: fs.ModeDir | 0500},
			"checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9/check": {Mode: 0400, Data: []byte{0}},
			"checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU":       {Mode: fs.ModeDir | 0500},
			"checksum/OLBgp1GsljhM2TJ-sbHjaiH9txEUvgdDTAzHv2P24donTt6_529l-9Ua0vFImLlb":       {Mode: 0400, Data: []byte{}},
			"checksum/nY_CUdiaUM1OL4cPr5TS92FCJ3rCRV7Hm5oVTzAvMXwC03_QnTRfQ5PPs7mOU9fK":       {Mode: fs.ModeDir | 0500},
			"checksum/nY_CUdiaUM1OL4cPr5TS92FCJ3rCRV7Hm5oVTzAvMXwC03_QnTRfQ5PPs7mOU9fK/check": {Mode: 0400, Data: []byte("layers")},

			"identifier": {Mode: fs.ModeDir | 0700},
			"identifier/YK1yDoi_qaUuXSPeVLJnaL8CBuZC4LoCarId5vdBCTLU82-vZFIfLDlaJuLM1iBj": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/nY_CUdiaUM1OL4cPr5TS92FCJ3rCRV7Hm5oVTzAvMXwC03_QnTRfQ5PPs7mOU9fK")},
			"identifier/_gAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/OLBgp1GsljhM2TJ-sbHjaiH9txEUvgdDTAzHv2P24donTt6_529l-9Ua0vFImLlb")},
			"identifier/cGvuAdKA2tThRa4w3ZI2c5S5TXDx4j2qvfFM7pzf7y5vBz7NisBV06ThBXw_97xK": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},
			"identifier/g6gj2JWNXN-oNikou626vDqcMeZCn_TcV4xKuizBaPAWcasG2sVvItb5kZovMrzE": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9")},

			"temp": {Mode: fs.ModeDir | 0700},
			"work": {Mode: fs.ModeDir | 0700},
		}, []pkg.FlatEntry{
			{Mode: fs.ModeDir | 0700, Path: "."},

			{Mode: fs.ModeDir | 0700, Path: "checksum"},
			{Mode: fs.ModeDir | 0500, Path: "checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9"},
			{Mode: 0400, Path: "checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9/check", Data: []byte{0}},
			{Mode: fs.ModeDir | 0500, Path: "checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU"},
			{Mode: 0400, Path: "checksum/OLBgp1GsljhM2TJ-sbHjaiH9txEUvgdDTAzHv2P24donTt6_529l-9Ua0vFImLlb", Data: []byte{}},
			{Mode: fs.ModeDir | 0500, Path: "checksum/nY_CUdiaUM1OL4cPr5TS92FCJ3rCRV7Hm5oVTzAvMXwC03_QnTRfQ5PPs7mOU9fK"},
			{Mode: 0400, Path: "checksum/nY_CUdiaUM1OL4cPr5TS92FCJ3rCRV7Hm5oVTzAvMXwC03_QnTRfQ5PPs7mOU9fK/check", Data: []byte("layers")},

			{Mode: fs.ModeDir | 0700, Path: "identifier"},
			{Mode: fs.ModeSymlink | 0777, Path: "identifier/YK1yDoi_qaUuXSPeVLJnaL8CBuZC4LoCarId5vdBCTLU82-vZFIfLDlaJuLM1iBj", Data: []byte("../checksum/nY_CUdiaUM1OL4cPr5TS92FCJ3rCRV7Hm5oVTzAvMXwC03_QnTRfQ5PPs7mOU9fK")},
			{Mode: fs.ModeSymlink | 0777, Path: "identifier/_gAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA", Data: []byte("../checksum/OLBgp1GsljhM2TJ-sbHjaiH9txEUvgdDTAzHv2P24donTt6_529l-9Ua0vFImLlb")},
			{Mode: fs.ModeSymlink | 0777, Path: "identifier/cGvuAdKA2tThRa4w3ZI2c5S5TXDx4j2qvfFM7pzf7y5vBz7NisBV06ThBXw_97xK", Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},
			{Mode: fs.ModeSymlink | 0777, Path: "identifier/g6gj2JWNXN-oNikou626vDqcMeZCn_TcV4xKuizBaPAWcasG2sVvItb5kZovMrzE", Data: []byte("../checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9")},

			{Mode: fs.ModeDir | 0700, Path: "temp"},
			{Mode: fs.ModeDir | 0700, Path: "work"},
		}, pkg.MustDecode("OG6C_fL-U4dZndkiKJvXf31qrM7DNpmCGxbWASwhWK_e8twIwC_ZvMvw142pVqz-"), nil},

		{"sample exec container layer promotion", fstest.MapFS{
			".": {Mode: fs.ModeDir | 0700},

			"checksum": {Mode: fs.ModeDir | 0700},
			"checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9":       {Mode: fs.ModeDir | 0500},
			"checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9/check": {Mode: 0400, Data: []byte{0}},
			"checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU":       {Mode: fs.ModeDir | 0500},

			"identifier": {Mode: fs.ModeDir | 0700},
			"identifier/CuKcA4aAApOvWqI6-KzZEDyGLltRdBjOTyrTibam2fFVxtXmGL_RVuElOFTVlKfq": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},
			"identifier/cGvuAdKA2tThRa4w3ZI2c5S5TXDx4j2qvfFM7pzf7y5vBz7NisBV06ThBXw_97xK": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},
			"identifier/ywzI31S5McuYu7vzI2kqpSC_nsNzpWBXVCwPoLAYi9QVT0mODgzqoo9jYYaczPbf": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9")},

			"temp": {Mode: fs.ModeDir | 0700},
			"work": {Mode: fs.ModeDir | 0700},
		}, []pkg.FlatEntry{
			{Mode: fs.ModeDir | 0700, Path: "."},

			{Mode: fs.ModeDir | 0700, Path: "checksum"},
			{Mode: fs.ModeDir | 0500, Path: "checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9"},
			{Mode: 0400, Path: "checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9/check", Data: []byte{0}},
			{Mode: fs.ModeDir | 0500, Path: "checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU"},

			{Mode: fs.ModeDir | 0700, Path: "identifier"},
			{Mode: fs.ModeSymlink | 0777, Path: "identifier/CuKcA4aAApOvWqI6-KzZEDyGLltRdBjOTyrTibam2fFVxtXmGL_RVuElOFTVlKfq", Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},
			{Mode: fs.ModeSymlink | 0777, Path: "identifier/cGvuAdKA2tThRa4w3ZI2c5S5TXDx4j2qvfFM7pzf7y5vBz7NisBV06ThBXw_97xK", Data: []byte("../checksum/MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU")},
			{Mode: fs.ModeSymlink | 0777, Path: "identifier/ywzI31S5McuYu7vzI2kqpSC_nsNzpWBXVCwPoLAYi9QVT0mODgzqoo9jYYaczPbf", Data: []byte("../checksum/GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9")},

			{Mode: fs.ModeDir | 0700, Path: "temp"},
			{Mode: fs.ModeDir | 0700, Path: "work"},
		}, pkg.MustDecode("CKt376G_wCHRR26hBxLnoXyz5boEOX12AiHbQM2qz4bejKtfmys3Swqh60eKFn9y"), nil},

		{"sample file short", fstest.MapFS{
			".": {Mode: fs.ModeDir | 0700},

			"checksum": {Mode: fs.ModeDir | 0700},
			"checksum/vsAhtPNo4waRNOASwrQwcIPTqb3SBuJOXw2G4T1mNmVZM-wrQTRllmgXqcIIoRcX": {Mode: 0400, Data: []byte{0}},

			"identifier": {Mode: fs.ModeDir | 0700},
			"identifier/3nNZXzfgfDW2aHqmgf1VpJUYxe1GMzU7eA9Q_NnNVTDPpPOCTYKEVX-yscOiLT-e": {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/vsAhtPNo4waRNOASwrQwcIPTqb3SBuJOXw2G4T1mNmVZM-wrQTRllmgXqcIIoRcX")},

			"work": {Mode: fs.ModeDir | 0700},
		}, []pkg.FlatEntry{
			{Mode: fs.ModeDir | 0700, Path: "."},
			{Mode: fs.ModeDir | 0700, Path: "checksum"},
			{Mode: 0400, Path: "checksum/vsAhtPNo4waRNOASwrQwcIPTqb3SBuJOXw2G4T1mNmVZM-wrQTRllmgXqcIIoRcX", Data: []byte{0}},

			{Mode: fs.ModeDir | 0700, Path: "identifier"},
			{Mode: fs.ModeSymlink | 0777, Path: "identifier/3nNZXzfgfDW2aHqmgf1VpJUYxe1GMzU7eA9Q_NnNVTDPpPOCTYKEVX-yscOiLT-e", Data: []byte("../checksum/vsAhtPNo4waRNOASwrQwcIPTqb3SBuJOXw2G4T1mNmVZM-wrQTRllmgXqcIIoRcX")},

			{Mode: fs.ModeDir | 0700, Path: "work"},
		}, pkg.MustDecode("azjTvqkTjLhFzvPDM4DEHiHyLupOnRq9GCikVN6DEElR1Gxz_BDo4SA0zZzaYUGa"), nil},
	}
	for _, tc := range testCases {
		t.Run(tc.name, func(t *testing.T) {
			t.Parallel()

			t.Run("roundtrip", func(t *testing.T) {
				t.Parallel()

				var buf bytes.Buffer
				if _, err := pkg.Flatten(
					tc.fsys,
					".",
					&buf,
				); !reflect.DeepEqual(err, tc.err) {
					t.Fatalf("Flatten: error = %v, want %v", err, tc.err)
				} else if tc.err != nil {
					return
				}

				s := pkg.NewDirScanner(bytes.NewReader(buf.Bytes()), true)
				var got []pkg.FlatEntry
				for s.Scan() {
					got = append(got, *s.Entry())
				}
				if err := s.Err(); err != nil {
					t.Fatalf("Err: error = %v", err)
				}

				if !reflect.DeepEqual(got, tc.entries) {
					t.Fatalf("Scan: %#v, want %#v", got, tc.entries)
				}
			})

			if tc.err != nil {
				return
			}

			t.Run("hash", func(t *testing.T) {
				t.Parallel()

				var got pkg.Checksum
				if err := pkg.HashFS(&got, tc.fsys, "."); err != nil {
					t.Fatalf("HashFS: error = %v", err)
				} else if got != tc.sum {
					t.Fatalf("HashFS: %v", &pkg.ChecksumMismatchError{
						Got:  got,
						Want: tc.sum,
					})
				}
			})
		})
	}
}