feat(golang): add license parsing from vendor dirs (#3522)

Signed-off-by: Dominik Schmidt <dev@dominik-schmidt.de>
Signed-off-by: Keith Zantow <kzantow@gmail.com>
Co-authored-by: Keith Zantow <kzantow@gmail.com>

syft/pkg/cataloger/golang/config_test.go

@@ -10,11 +10,12 @@ import (
 
 func Test_Config(t *testing.T) {
 	type opts struct {
-		local    bool
-		cacheDir string
-		remote   bool
-		proxy    string
-		noProxy  string
+		local     bool
+		cacheDir  string
+		vendorDir string
+		remote    bool
+		proxy     string
+		noProxy   string
 	}
 
 	homedirCacheDisabled := homedir.DisableCache
@@ -45,10 +46,15 @@ func Test_Config(t *testing.T) {
 				"GOPRIVATE": "my.private",
 				"GONOPROXY": "no.proxy",
 			},
-			opts: opts{},
+			opts: opts{
+				// defaults to $cwd/vendor, we need to set it to make the output predictable
+				vendorDir: "/vendor",
+			},
 			expected: CatalogerConfig{
 				SearchLocalModCacheLicenses: false,
 				LocalModCacheDir:            filepath.Join("/go", "pkg", "mod"),
+				SearchLocalVendorLicenses:   false,
+				LocalVendorDir:              "/vendor",
 				SearchRemoteLicenses:        false,
 				Proxies:                     []string{"https://my.proxy"},
 				NoProxy:                     []string{"my.private", "no.proxy"},
@@ -64,15 +70,18 @@ func Test_Config(t *testing.T) {
 				"GONOPROXY": "no.proxy",
 			},
 			opts: opts{
-				local:    true,
-				cacheDir: "/go-cache",
-				remote:   true,
-				proxy:    "https://alt.proxy,direct",
-				noProxy:  "alt.no.proxy",
+				local:     true,
+				cacheDir:  "/go-cache",
+				vendorDir: "/vendor",
+				remote:    true,
+				proxy:     "https://alt.proxy,direct",
+				noProxy:   "alt.no.proxy",
 			},
 			expected: CatalogerConfig{
 				SearchLocalModCacheLicenses: true,
 				LocalModCacheDir:            "/go-cache",
+				SearchLocalVendorLicenses:   true,
+				LocalVendorDir:              "/vendor",
 				SearchRemoteLicenses:        true,
 				Proxies:                     []string{"https://alt.proxy", "direct"},
 				NoProxy:                     []string{"alt.no.proxy"},
@@ -92,6 +101,8 @@ func Test_Config(t *testing.T) {
 			got := DefaultCatalogerConfig().
 				WithSearchLocalModCacheLicenses(test.opts.local).
 				WithLocalModCacheDir(test.opts.cacheDir).
+				WithSearchLocalVendorLicenses(test.opts.local).
+				WithLocalVendorDir(test.opts.vendorDir).
 				WithSearchRemoteLicenses(test.opts.remote).
 				WithProxy(test.opts.proxy).
 				WithNoProxy(test.opts.noProxy)