meson: Add dist script to vendor cargo dependencies for offline builds

build-aux/dist-vendor.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+export DIST="$1"
+export SOURCE_ROOT="$2"
+
+cd "$SOURCE_ROOT"
+mkdir "$DIST"/.cargo
+cargo vendor > $DIST/.cargo/config
+# Move vendor into dist tarball directory
+mv vendor "$DIST"

meson.build

@@ -21,6 +21,12 @@ bindir = prefix / get_option('bindir')
 datadir = prefix / get_option('datadir')
 iconsdir = datadir / 'icons'
 
+meson.add_dist_script(
+  'build-aux/dist-vendor.sh',
+  meson.build_root() / 'meson-dist' / meson.project_name() + '-' + meson.project_version(),
+  meson.source_root()
+)
+
 cargo_sources = files(
   'Cargo.toml',
   'Cargo.lock',