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// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause
package deb
import (
"bytes"
"crypto/md5"
"crypto/sha1"
"crypto/sha256"
"encoding/hex"
"fmt"
"hash"
"strings"
"testing"
"github.com/google/go-cmp/cmp"
"github.com/goreleaser/nfpm/v2"
_ "github.com/goreleaser/nfpm/v2/deb"
)
func TestDebInfo(t *testing.T) {
tests := []struct {
name string
in []byte
want *Info
wantErr bool
}{
{
name: "simple",
in: mkTestDeb("1.2.3", "amd64"),
want: &Info{
Version: "1.2.3",
Arch: "amd64",
Control: mkControl(
"Package", "tailscale",
"Version", "1.2.3",
"Section", "net",
"Priority", "extra",
"Architecture", "amd64",
"Maintainer", "Tail Scalar",
"Installed-Size", "0",
"Description", "test package"),
},
},
{
name: "arm64",
in: mkTestDeb("1.2.3", "arm64"),
want: &Info{
Version: "1.2.3",
Arch: "arm64",
Control: mkControl(
"Package", "tailscale",
"Version", "1.2.3",
"Section", "net",
"Priority", "extra",
"Architecture", "arm64",
"Maintainer", "Tail Scalar",
"Installed-Size", "0",
"Description", "test package"),
},
},
{
name: "unstable",
in: mkTestDeb("1.7.25", "amd64"),
want: &Info{
Version: "1.7.25",
Arch: "amd64",
Control: mkControl(
"Package", "tailscale",
"Version", "1.7.25",
"Section", "net",
"Priority", "extra",
"Architecture", "amd64",
"Maintainer", "Tail Scalar",
"Installed-Size", "0",
"Description", "test package"),
},
},
// These truncation tests assume the structure of a .deb
// package, which is as follows:
// magic: 8 bytes
// file header: 60 bytes, before each file blob
//
// The first file in a .deb ar is "debian-binary", which is 4
// bytes long and consists of "2.0\n".
// The second file is control.tar.gz, which is what we care
// about introspecting for metadata.
// The final file is data.tar.gz, which we don't care about.
//
// The first file in control.tar.gz is the "control" file we
// want to read for metadata.
{
name: "truncated_ar_magic",
in: mkTestDeb("1.7.25", "amd64")[:4],
wantErr: true,
},
{
name: "truncated_ar_header",
in: mkTestDeb("1.7.25", "amd64")[:30],
wantErr: true,
},
{
name: "missing_control_tgz",
// Truncate right after the "debian-binary" file, which
// makes the file a valid 1-file archive that's missing
// control.tar.gz.
in: mkTestDeb("1.7.25", "amd64")[:72],
wantErr: true,
},
{
name: "truncated_tgz",
in: mkTestDeb("1.7.25", "amd64")[:172],
wantErr: true,
},
}
for _, test := range tests {
// mkTestDeb returns non-deterministic output due to
// timestamps embedded in the package file, so compute the
// wanted hashes on the fly here.
if test.want != nil {
test.want.MD5 = mkHash(test.in, md5.New)
test.want.SHA1 = mkHash(test.in, sha1.New)
test.want.SHA256 = mkHash(test.in, sha256.New)
}
t.Run(test.name, func(t *testing.T) {
b := bytes.NewBuffer(test.in)
got, err := Read(b)
if err != nil {
if test.wantErr {
t.Logf("got expected error: %v", err)
return
}
t.Fatalf("reading deb info: %v", err)
}
if diff := diff(got, test.want); diff != "" {
t.Fatalf("parsed info diff (-got+want):\n%s", diff)
}
})
}
}
func diff(got, want any) string {
matchField := func(name string) func(p cmp.Path) bool {
return func(p cmp.Path) bool {
if len(p) != 3 {
return false
}
return p[2].String() == "."+name
}
}
toLines := cmp.Transformer("lines", func(b []byte) []string { return strings.Split(string(b), "\n") })
toHex := cmp.Transformer("hex", func(b []byte) string { return hex.EncodeToString(b) })
return cmp.Diff(got, want,
cmp.FilterPath(matchField("Control"), toLines),
cmp.FilterPath(matchField("MD5"), toHex),
cmp.FilterPath(matchField("SHA1"), toHex),
cmp.FilterPath(matchField("SHA256"), toHex))
}
func mkTestDeb(version, arch string) []byte {
info := nfpm.WithDefaults(&nfpm.Info{
Name: "tailscale",
Description: "test package",
Arch: arch,
Platform: "linux",
Version: version,
Section: "net",
Priority: "extra",
Maintainer: "Tail Scalar",
})
pkg, err := nfpm.Get("deb")
if err != nil {
panic(fmt.Sprintf("getting deb packager: %v", err))
}
var b bytes.Buffer
if err := pkg.Package(info, &b); err != nil {
panic(fmt.Sprintf("creating deb package: %v", err))
}
return b.Bytes()
}
func mkControl(fs ...string) []byte {
if len(fs)%2 != 0 {
panic("odd number of control file fields")
}
var b bytes.Buffer
for i := 0; i < len(fs); i = i + 2 {
k, v := fs[i], fs[i+1]
fmt.Fprintf(&b, "%s: %s\n", k, v)
}
return bytes.TrimSpace(b.Bytes())
}
func mkHash(b []byte, hasher func() hash.Hash) []byte {
h := hasher()
h.Write(b)
return h.Sum(nil)
}
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