[PATCH v2] debianize: allow setting Rules-Requires-Root

[Isaac True <itrue@emlix.com>]

Add a new variable "DEBIAN_RULES_REQUIRES_ROOT" which can be used to
control the value of the "Rules-Requires-Root" parameter in the
debian/control file. If this variable has no value (the default
behaviour), nothing is added. Otherwise, it appends
"Rules-Requires-Root: ${DEBIAN_RULES_REQUIRES_ROOT}" to the
Source section of the debian/control file.

This can be useful when using dpkg-raw, as setting this value to "no"
skips calling `fakeroot` during the package build process, which can
provide a considerable speedup in some environments (e.g. systems with
very high open file descriptor limits and specific versions of
fakeroot).

Signed-off-by: Isaac True <itrue@emlix.com>
---

Changes in v2:
- Add information to RECIPE-API-CHANGELOG.md
- Only add Rules-Requires-Root if the DEBIAN_RULES_REQUIRES_ROOT
  variable has been set

 RECIPE-API-CHANGELOG.md        |  8 ++++++++
 meta/classes/debianize.bbclass | 17 ++++++++++++++++-
 2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/RECIPE-API-CHANGELOG.md b/RECIPE-API-CHANGELOG.md
index 8468717d..f0b94c2f 100644
--- a/RECIPE-API-CHANGELOG.md
+++ b/RECIPE-API-CHANGELOG.md
@@ -727,3 +727,11 @@ Changes in next
 
 This was never documented and never had practical relevance. `oci-archive` is
 the useful OCI image format that can be imported, e.g., by podman.
+
+### Allow setting Rules-Requires-Root
+
+Recipes based on the `debianize` class can now set the
+`DEBIAN_RULES_REQUIRES_ROOT` variable to control the value of the
+`Rules-Requires-Root` setting in the `debian/control` file. If this variable is
+unset (the default), `Rules-Requires-Root` will not be added. Otherwise,
+`Rules-Requires-Root` will be added and set to the value of the variable.
diff --git a/meta/classes/debianize.bbclass b/meta/classes/debianize.bbclass
index 4989c601..acc5a1ba 100644
--- a/meta/classes/debianize.bbclass
+++ b/meta/classes/debianize.bbclass
@@ -16,6 +16,7 @@ DEBIAN_BREAKS ??= ""
 DEBIAN_MULTI_ARCH ??= "no"
 DEBIAN_COMPAT ??= "10"
 DEBIAN_CHANGELOG_TIMESTAMP ??= "3600"
+DEBIAN_RULES_REQUIRES_ROOT ??= ""
 DESCRIPTION ??= "must not be empty"
 MAINTAINER ??= "Unknown maintainer <unknown@example.com>"
 
@@ -74,8 +75,10 @@ deb_create_control[vardeps] += "DEBIANIZE_BUILD_DEPENDS \
                                 DEBIAN_PROVIDES \
                                 DEBIAN_REPLACES \
                                 DEBIAN_BREAKS \
-                                DEBIAN_CONFLICTS"
+                                DEBIAN_CONFLICTS \
+                                DEBIAN_RULES_REQUIRES_ROOT"
 deb_create_control() {
+	# Add Source section
 	cat << EOF > ${S}/debian/control
 Source: ${BPN}
 Section: misc
@@ -83,6 +86,18 @@ Priority: optional
 Standards-Version: 3.9.6
 Maintainer: ${MAINTAINER}
 Build-Depends: ${@ deb_list_beautify(d, 'DEBIANIZE_BUILD_DEPENDS')}
+EOF
+
+	# If a value has been set, add the value of DEBIAN_RULES_REQUIRES_ROOT to
+	# the control file.
+	if [ -n "${DEBIAN_RULES_REQUIRES_ROOT}" ]; then
+		echo "Rules-Requires-Root: ${DEBIAN_RULES_REQUIRES_ROOT}" >> \
+			${S}/debian/control
+	fi
+
+	# Add Package section proceeded by an empty line to separate it from the
+	# previous section.
+	cat << EOF >> ${S}/debian/control
 
 Package: ${BPN}
 Architecture: ${DPKG_ARCH}

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