[RFC PATCH 2/3] Add example of a rust hello world as isar recipe

["'Quirin Gylstorff' via isar-users" <isar-users@googlegroups.com>]

From: Quirin Gylstorff <quirin.gylstorff@siemens.com>

Signed-off-by: Quirin Gylstorff <quirin.gylstorff@siemens.com>
---
 .../recipes-app/rust-hello-isar/files/rules   | 27 +++++++++++++++++++
 .../files/rust-hello-isar/Cargo.toml          |  6 +++++
 .../files/rust-hello-isar/src/main.rs         |  3 +++
 .../rust-hello-isar/rust-hello-isar_0.1.bb    | 22 +++++++++++++++
 4 files changed, 58 insertions(+)
 create mode 100755 meta-isar/recipes-app/rust-hello-isar/files/rules
 create mode 100644 meta-isar/recipes-app/rust-hello-isar/files/rust-hello-isar/Cargo.toml
 create mode 100644 meta-isar/recipes-app/rust-hello-isar/files/rust-hello-isar/src/main.rs
 create mode 100644 meta-isar/recipes-app/rust-hello-isar/rust-hello-isar_0.1.bb

diff --git a/meta-isar/recipes-app/rust-hello-isar/files/rules b/meta-isar/recipes-app/rust-hello-isar/files/rules
new file mode 100755
index 00000000..213cc876
--- /dev/null
+++ b/meta-isar/recipes-app/rust-hello-isar/files/rules
@@ -0,0 +1,27 @@
+#!/usr/bin/make -f
+
+export DEB_BUILD_MAINT_OPTIONS = hardening=+all
+DPKG_EXPORT_BUILDFLAGS = 1
+include /usr/share/dpkg/default.mk
+include /usr/share/rustc/architecture.mk
+export DEB_HOST_RUST_TYPE
+export PATH:=/usr/share/cargo/bin:$(PATH)
+export CARGO=/usr/share/cargo/bin/cargo
+export CARGO_HOME=$(CURDIR)/debian/cargo_home
+export CARGO_REGISTRY=$(CURDIR)/debian/cargo_registry
+export DEB_CARGO_CRATE=$(DEB_SOURCE)_$(DEB_VERSION_UPSTREAM)
+
+%:
+	dh $@ --buildsystem=cargo
+
+execute_after_dh_auto_clean:
+	$(CARGO) clean
+	rm -rf $(CARGO_HOME)
+	rm -rf $(CARGO_REGISTRY)
+	rm -f debian/cargo-checksum.json
+
+execute_before_dh_auto_configure:
+	$(CARGO) prepare-debian $(CARGO_REGISTRY) --link-from-system
+	rm -f Cargo.lock
+	touch debian/cargo-checksum.json
+
diff --git a/meta-isar/recipes-app/rust-hello-isar/files/rust-hello-isar/Cargo.toml b/meta-isar/recipes-app/rust-hello-isar/files/rust-hello-isar/Cargo.toml
new file mode 100644
index 00000000..f761691e
--- /dev/null
+++ b/meta-isar/recipes-app/rust-hello-isar/files/rust-hello-isar/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "rust-hello-isar"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
diff --git a/meta-isar/recipes-app/rust-hello-isar/files/rust-hello-isar/src/main.rs b/meta-isar/recipes-app/rust-hello-isar/files/rust-hello-isar/src/main.rs
new file mode 100644
index 00000000..50469bdf
--- /dev/null
+++ b/meta-isar/recipes-app/rust-hello-isar/files/rust-hello-isar/src/main.rs
@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, isar!");
+}
diff --git a/meta-isar/recipes-app/rust-hello-isar/rust-hello-isar_0.1.bb b/meta-isar/recipes-app/rust-hello-isar/rust-hello-isar_0.1.bb
new file mode 100644
index 00000000..2d57b8c8
--- /dev/null
+++ b/meta-isar/recipes-app/rust-hello-isar/rust-hello-isar_0.1.bb
@@ -0,0 +1,22 @@
+# Sample application
+#
+# This software is a part of ISAR.
+# Copyright (C) 2026 Siemens AG
+
+inherit dpkg
+
+DESCRIPTION = "Hello world example for Rust"
+MAINTAINER = "isar-users <isar-users@googlegroups.com>"
+
+SRC_URI = "file://${PN} \
+           file://rules"
+
+DEBIAN_BUILD_DEPENDS += "dh-cargo"
+
+S = "${WORKDIR}/${PN}"
+
+do_prepare_build() {
+    deb_debianize
+    install  -m 644 ${WORKDIR}/rules ${S}/debian/rules
+}
+
-- 
2.53.0

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