support/download/cargo-post-process: cargo output for vendor config

Use the output of `cargo vendor` to generate the vendor configuration.

Fixes the need to patch the generated configuration if there are
non-crates.io dependencies.

Note:
  `cargo vendor` currently prints a newline before it prints the
  needed configuration.

  This is fixed in +nightly, will end up in +stable soon and must
  be considered when updating cargo.
  See: rust-lang/cargo#11273

  Until then it is needed to remove this first line to make sure
  that the contents of .cargo/config will be the same as they were
  generated with the earlier version of the script. Thus, the
  hashes of the packages that use this script remain the same.

Signed-off-by: Simon Richter <simon.richter@ptwdosimetry.com>
[yann.morin.1998@free.fr: add comment in rust-bin.mk and rust.mk]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/rust-bin/rust-bin.mk

@@ -4,6 +4,8 @@
 #
 ################################################################################
 
+# When updating this version, check whether support/download/cargo-post-process
+# still generates the same archives.
 RUST_BIN_VERSION = 1.64.0
 RUST_BIN_SITE = https://static.rust-lang.org/dist
 RUST_BIN_LICENSE = Apache-2.0 or MIT

package/rust/rust.mk

@@ -4,6 +4,8 @@
 #
 ################################################################################
 
+# When updating this version, check whether support/download/cargo-post-process
+# still generates the same archives.
 RUST_VERSION = 1.64.0
 RUST_SOURCE = rustc-$(RUST_VERSION)-src.tar.xz
 RUST_SITE = https://static.rust-lang.org/dist

support/download/cargo-post-process

@@ -0,0 +1,50 @@
+#!/usr/bin/env bash
+
+set -e
+set -o pipefail
+
+. "${0%/*}/helpers"
+
+while getopts "n:o:" OPT; do
+ case "${OPT}" in
+ o) output="${OPTARG}";;
+ n) base_name="${OPTARG}";;
+ :) error "option '%s' expects a mandatory argument\n" "${OPTARG}";;
+ \?) error "unknown option '%s'\n" "${OPTARG}";;
+ esac
+done
+
+# Already vendored tarball, nothing to do
+if tar tf "${output}" | grep -q "^[^/]*/VENDOR" ; then
+ exit 0
+fi
+
+post_process_unpack "${base_name}" "${output}"
+
+# Do the Cargo vendoring
+pushd "${base_name}" > /dev/null
+
+# Create the local .cargo/config with vendor info
+#
+# The first line of the output to stdout is empty.
+# So skip it to have the file start with the vendoring
+# configuration (`tail --lines=+2`).
+#
+# NOTE:
+# There is a patch for cargo to remove the first empty line:
+# See: https://github.com/rust-lang/cargo/pull/11273
+#
+# The patch already landed in +nightly and will end up
+# in +stable soon.
+#
+# -> When updating rust/cargo, the call to `tail` must be removed.
+#
+mkdir -p .cargo/
+cargo vendor \
+ --manifest-path ${BR_CARGO_MANIFEST_PATH-Cargo.toml} \
+ --locked VENDOR \
+ | tail --lines=+2 | tee .cargo/config
+
+popd > /dev/null
+
+post_process_repack "$(pwd)" "${base_name}" "${output}"