[RFC PATCH 1/3] Add script to generate a recipe for cargo.io crates

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

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

This script allows to create a recipe for building rust crates which
are not part of Debian. It uses for this `debcargo package` and follows
the process defined in https://rust-team.pages.debian.net/book.

Signed-off-by: Quirin Gylstorff <quirin.gylstorff@siemens.com>
---
 scripts/generate_cargo_crate.sh | 85 +++++++++++++++++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100755 scripts/generate_cargo_crate.sh

diff --git a/scripts/generate_cargo_crate.sh b/scripts/generate_cargo_crate.sh
new file mode 100755
index 00000000..759bbc9e
--- /dev/null
+++ b/scripts/generate_cargo_crate.sh
@@ -0,0 +1,85 @@
+#!/bin/bash
+# This software is a part of ISAR.
+# Copyright (C) 2026 Siemens AG
+
+usage() {
+    echo "This script generates a scaffold for rust crates from crates.io."
+    echo "It uses debcargo to download and generate the debian folder."
+    echo "USAGE: $0 <CRATE_NAME> [CRATE_VERSION]"
+}
+
+if [ $# -eq 0 ]; then
+    usage
+    exit 1
+fi
+case $1 in
+    -h|--help)
+            usage
+            exit 0
+            ;;
+    *)
+        true
+        ;;
+esac
+
+package_name=$1
+package_version=
+if [ $# -gt 1 ]; then
+    package_version=$2
+fi
+
+export NAME="isar-users isar"
+
+for dep in jq debcargo curl; do
+    if ! command -v "$dep" ;then
+        echo "Could not find tool dependency $dep !"
+        exit 1
+    fi
+done
+
+source_name="rust-$package_name"
+mkdir -p "$source_name/files"
+# generate in the current directory to avoid the following
+# debcargo error:
+# Invalid cross-device link (os error 18)
+TMP_DIR=$(mktemp -d -p .)
+pushd "$source_name" || exit 1
+debcargo package "$package_name" "$package_version" --directory "$TMP_DIR"
+cp -r "${TMP_DIR}"/debian files/
+if [ -z "$package_version" ]; then
+    package_version=$(grep -oP "X-Cargo-Crate-Version:\K.*" "${TMP_DIR}"/debian/control | tr -d "[:blank:]")
+fi
+rm -rf "$TMP_DIR"
+tarball_checksum="$(curl --silent "https://crates.io/api/v1/crates/${package_name}/${package_version}" | jq ".version.checksum" )"
+if [ "${tarball_checksum}" = "null" ] ; then
+    echo "$package_name in $package_version could not be found in crates.io"
+    exit 1
+fi
+cat << EOF >> "${source_name}_${package_version}".bb
+inherit dpkg
+
+SRC_URI = "https://crates.io/api/v1/crates/${package_name}/\${PV}/download;downloadfilename=${PN}_${PV}.tar.gz"
+SRC_URI += "file://debian"
+
+SRC_URI[sha256sum] = ${tarball_checksum}
+
+S = "\${WORKDIR}/${package_name}-\${PV}"
+
+# In most cases we want to package a library crate from crates.io
+PROVIDES += "librust-${package_name}-dev"
+
+do_prepare_build() {
+    cp -r \${WORKDIR}/debian \${S}/
+    cd \${WORKDIR}
+    tar cJf \${PN}_\${PV}.orig.tar.xz \${TAR_REPRO_OPTS} ${package_name}-\${PV}
+}
+EOF
+
+
+popd || exit 1
+
+echo "Finished generating isar scaffold for package $package_name in version $package_version"
+echo ""
+echo "Next steps:"
+echo "  - Check if the package builds and add the necessary patches, e.g. relax dependencies to the debian folder."
+echo "  - Also add the package to Debian by following https://rust-team.pages.debian.net/book/"
-- 
2.53.0

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