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

["'Jan Kiszka' via isar-users" <isar-users@googlegroups.com>]

On 23.03.26 11:52, 'Quirin Gylstorff' via isar-users wrote:
> 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

Maybe leave a comment like this behind:

# Created by generate_cargo_crate.sh.
# SPDX-License-Identifier: MIT-0

That license is like the MIT, except that it comes without the
attribution paragraph, thus allows re-licensing without hassles.

> +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/"

Jan

-- 
Siemens AG, Foundational Technologies
Linux Expert Center

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