feat: add Requires(Post) for RPMS

nfpm.go

@@ -220,6 +220,7 @@ func (c *Config) expandEnvVars() {
 		c.Overrides[or].Recommends = c.expandEnvVarsStringSlice(c.Overrides[or].Recommends)
 		c.Overrides[or].Provides = c.expandEnvVarsStringSlice(c.Overrides[or].Provides)
 		c.Overrides[or].Suggests = c.expandEnvVarsStringSlice(c.Overrides[or].Suggests)
+		c.Overrides[or].RPM.Requires.Post = c.expandEnvVarsStringSlice(c.Overrides[or].RPM.Requires.Post)
 		c.Overrides[or].Contents = c.expandEnvVarsContents(c.Overrides[or].Contents)
 	}
 	c.Conflicts = c.expandEnvVarsStringSlice(c.Conflicts)
@@ -228,6 +229,7 @@ func (c *Config) expandEnvVars() {
 	c.Recommends = c.expandEnvVarsStringSlice(c.Recommends)
 	c.Provides = c.expandEnvVarsStringSlice(c.Provides)
 	c.Suggests = c.expandEnvVarsStringSlice(c.Suggests)
+	c.RPM.Requires.Post = c.expandEnvVarsStringSlice(c.RPM.Requires.Post)
 	c.Contents = c.expandEnvVarsContents(c.Contents)
 
 	// Basic metadata fields
@@ -392,6 +394,7 @@ 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"`
+	Requires    RPMRequires  `yaml:"requires,omitempty" json:"requires,omitempty" jsonschema:"title=rpm-specific requires"`
 	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"`
 	Compression string       `yaml:"compression,omitempty" json:"compression,omitempty" jsonschema:"title=compression algorithm to be used,enum=gzip,enum=lzma,enum=xz,enum=zstd,default=gzip:-1"`
@@ -407,6 +410,11 @@ type RPMScripts struct {
 	Verify    string `yaml:"verify,omitempty" json:"verify,omitempty" jsonschema:"title=verify script"`
 }
 
+// RPMRequires represents qualified RPM Requires dependencies.
+type RPMRequires struct {
+	Post []string `yaml:"post,omitempty" json:"post,omitempty" jsonschema:"title=post requires directive,example=nfpm"`
+}
+
 type PackageSignature struct {
 	// PGP secret key, can be ASCII-armored
 	KeyFile       string  `yaml:"key_file,omitempty" json:"key_file,omitempty" jsonschema:"title=key file,example=key.gpg"`

rpm/rpm.go

@@ -30,6 +30,9 @@ const (
 	tagChangelogText = 1082
 	// https://github.com/rpm-software-management/rpm/blob/master/include/rpm/rpmtag.h#L183
 	tagSourcePackage = 1106
+	// RPMSENSE_SCRIPT_POST marks a dependency as Requires(post).
+	// https://github.com/rpm-software-management/rpm/blob/master/include/rpm/rpmds.h
+	rpmSenseScriptPost = 1 << 10
 
 	// Symbolic link
 	tagLink = 0o120000
@@ -247,6 +250,9 @@ func buildRPMMeta(info *nfpm.Info) (*rpmpack.RPMMetaData, error) {
 	if depends, err = toRelation(info.Depends); err != nil {
 		return nil, err
 	}
+	if err = addPostRequires(&depends, info.RPM.Requires.Post); err != nil {
+		return nil, err
+	}
 	if recommends, err = toRelation(info.Recommends); err != nil {
 		return nil, err
 	}
@@ -327,6 +333,19 @@ func toRelation(items []string) (rpmpack.Relations, error) {
 	return relations, nil
 }
 
+func addPostRequires(relations *rpmpack.Relations, items []string) error {
+	for idx := range items {
+		relation, err := rpmpack.NewRelation(items[idx])
+		if err != nil {
+			return err
+		}
+		relation.Sense |= rpmSenseScriptPost
+		*relations = append(*relations, relation)
+	}
+
+	return nil
+}
+
 func addScriptFiles(info *nfpm.Info, rpm *rpmpack.RPM) error {
 	if info.RPM.Scripts.PreTrans != "" {
 		data, err := os.ReadFile(info.RPM.Scripts.PreTrans)

rpm/rpm_test.go

@@ -22,6 +22,12 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
+const (
+	tagRequireFlags   = 1048
+	tagRequireName    = 1049
+	tagRequireVersion = 1050
+)
+
 func exampleInfo() *nfpm.Info {
 	return setDefaults(nfpm.WithDefaults(&nfpm.Info{
 		Name:        "foo",
@@ -154,6 +160,50 @@ func TestRPM(t *testing.T) {
 	require.Equal(t, "Foo does things", description)
 }
 
+func TestRPMPostRequires(t *testing.T) {
+	info := exampleInfo()
+	info.RPM.Requires.Post = []string{"systemd", "coreutils >= 9.0"}
+
+	var buf bytes.Buffer
+	err := DefaultRPM.Package(info, &buf)
+	require.NoError(t, err)
+
+	rpm, err := rpmutils.ReadRpm(&buf)
+	require.NoError(t, err)
+
+	namesRaw, err := rpm.Header.Get(tagRequireName)
+	require.NoError(t, err)
+	names, ok := namesRaw.([]string)
+	require.True(t, ok)
+	versionsRaw, err := rpm.Header.Get(tagRequireVersion)
+	require.NoError(t, err)
+	versions, ok := versionsRaw.([]string)
+	require.True(t, ok)
+	flagsRaw, err := rpm.Header.Get(tagRequireFlags)
+	require.NoError(t, err)
+	flags, ok := flagsRaw.([]uint32)
+	require.True(t, ok)
+
+	requireRPMRequire(t, names, versions, flags, "systemd", "", rpmSenseScriptPost)
+	requireRPMRequire(t, names, versions, flags, "coreutils", "9.0", rpmSenseScriptPost|4)
+}
+
+func requireRPMRequire(
+	t *testing.T,
+	names, versions []string,
+	flags []uint32,
+	name, version string,
+	flag uint32,
+) {
+	t.Helper()
+	for idx := range names {
+		if names[idx] == name && versions[idx] == version && flags[idx] == flag {
+			return
+		}
+	}
+	require.Failf(t, "RPM require not found", "name=%s version=%s flag=%d", name, version, flag)
+}
+
 func TestIssue952(t *testing.T) {
 	info := exampleInfo()
 	info.MTime = time.Time{}

www/content/docs/configuration.md

@@ -340,6 +340,12 @@ rpm:
     # The verify script runs when verifying packages using `rpm -V`.
     verify: ./scripts/verify.sh
 
+  # RPM specific qualified Requires dependencies.
+  requires:
+    # Adds `Requires(post): systemd`.
+    post:
+      - systemd
+
   # The package group. This option is deprecated by most distros
   # but required by old distros like CentOS 5 / EL 5 and earlier.
   group: Unspecified