feat: Add BuildHost option to RPM packages

nfpm.go

@@ -377,6 +377,7 @@ type ArchLinuxScripts struct {
 // RPM is custom configs that are only available on RPM packages.
 type RPM struct {
 	Arch        string       `yaml:"arch,omitempty" json:"arch,omitempty" jsonschema:"title=architecture in rpm nomenclature"`
+	BuildHost   string       `yaml:"buildhost,omitempty" json:"buildhost,omitempty" jsonschema:"title=host name of the build environment, default=os.Hostname()"`
 	Scripts     RPMScripts   `yaml:"scripts,omitempty" json:"scripts,omitempty" jsonschema:"title=rpm-specific scripts"`
 	Group       string       `yaml:"group,omitempty" json:"group,omitempty" jsonschema:"title=package group,example=Unspecified"`
 	Summary     string       `yaml:"summary,omitempty" json:"summary,omitempty" jsonschema:"title=package summary"`

rpm/rpm.go

@@ -235,9 +235,12 @@ func buildRPMMeta(info *nfpm.Info) (*rpmpack.RPMMetaData, error) {
 		return nil, err
 	}
 
-	hostname, err := os.Hostname()
-	if err != nil {
-		return nil, err
+	hostname := info.RPM.BuildHost
+	if hostname == "" {
+		hostname, err = os.Hostname()
+		if err != nil {
+			return nil, err
+		}
 	}
 
 	return &rpmpack.RPMMetaData{

rpm/rpm_test.go

@@ -80,8 +80,9 @@ func exampleInfo() *nfpm.Info {
 				PostRemove:  "../testdata/scripts/postremove.sh",
 			},
 			RPM: nfpm.RPM{
-				Group:    "foo",
-				Prefixes: []string{"/opt"},
+				Group:     "foo",
+				BuildHost: "barhost",
+				Prefixes:  []string{"/opt"},
 				Scripts: nfpm.RPMScripts{
 					PreTrans:  "../testdata/scripts/pretrans.sh",
 					PostTrans: "../testdata/scripts/posttrans.sh",
@@ -139,6 +140,10 @@ func TestRPM(t *testing.T) {
 	require.NoError(t, err)
 	require.Equal(t, "foo", group)
 
+	buildhost, err := rpm.Header.GetString(rpmutils.BUILDHOST)
+	require.NoError(t, err)
+	require.Equal(t, "barhost", buildhost)
+
 	summary, err := rpm.Header.GetString(rpmutils.SUMMARY)
 	require.NoError(t, err)
 	require.Equal(t, "Foo does things", summary)

www/docs/configuration.md

@@ -351,6 +351,10 @@ rpm:
   # This will expand any env var you set in the field, e.g. packager: ${PACKAGER}
   packager: GoReleaser <[email protected]>
 
+  # The hostname of the machine the rpm was built with.  If ommited os.Hostname()
+  # will be used.
+  buildhost: buildserver1
+
   # Compression algorithm (gzip (default), zstd, lzma or xz).
   compression: zstd