feat(nfpm): add .Format tmpl var

Signed-off-by: Carlos Alexandro Becker <caarlos0@users.noreply.github.com>

internal/pipe/nfpm/nfpm.go

@@ -218,6 +218,10 @@ func create(ctx *context.Context, fpm config.NFPM, format string, artifacts []*a
 
 	// We cannot use t.ApplyAll on the following fields as they are shared
 	// across multiple nfpms.
+	//
+	t = t.WithExtraFields(tmpl.Fields{
+		"Format": format,
+	})
 
 	debKeyFile, err := t.Apply(overridden.Deb.Signature.KeyFile)
 	if err != nil {

internal/pipe/nfpm/nfpm_test.go

@@ -108,7 +108,7 @@ func TestRunPipe(t *testing.T) {
 
 	}
 	libPrefix := `/usr/lib
-      {{- if eq .Arch "amd64" }}64{{- end -}}
+      {{- if eq .Arch "amd64" }}{{if eq .Format "rpm"}}_rpm{{end}}64{{- end -}}
 	`
 	ctx := testctx.NewWithCfg(config.Project{
 		ProjectName: "mybin",
@@ -439,9 +439,15 @@ func TestRunPipe(t *testing.T) {
 		carchive := "/usr/lib/c-archives"
 		cshared := "/usr/lib/c-shareds"
 		if pkg.Goarch == "amd64" {
-			header = "/usr/lib64/headers"
-			carchive = "/usr/lib64/c-archives"
-			cshared = "/usr/lib64/c-shareds"
+			if pkg.Format() == "rpm" {
+				header = "/usr/lib_rpm64/headers"
+				carchive = "/usr/lib_rpm64/c-archives"
+				cshared = "/usr/lib_rpm64/c-shareds"
+			} else {
+				header = "/usr/lib64/headers"
+				carchive = "/usr/lib64/c-archives"
+				cshared = "/usr/lib64/c-shareds"
+			}
 		}
 		if format == termuxFormat {
 			bin = filepath.Join("/data/data/com.termux/files", bin)

www/docs/customization/templates.md

@@ -121,6 +121,7 @@ In the nFPM name template field, you can use those extra fields:
 | `.PackageName`           | package the name. Same as `ProjectName` if not overridden.      |
 | `.ConventionalFileName`  | conventional package file name as provided by nFPM.[^arm-names] |
 | `.ConventionalExtension` | conventional package extension as provided by nFPM. Since v1.16 |
+| `.Format`                | package format. Since v1.24                                     |
 
 [^arm-names]:
     Please beware: some OSs might have the same names for different