layers/meta-opentrons: add cargo recipe crates classes

From upstream meta-openembedded

layers/meta-opentrons/classes/cargo-update-recipe-crates.bbclass

@@ -0,0 +1,81 @@
+#
+# Copyright OpenEmbedded Contributors
+#
+# SPDX-License-Identifier: MIT
+#
+
+##
+## Purpose:
+## This class is used to update the list of crates in SRC_URI
+## by reading Cargo.lock in the source tree.
+##
+## See meta/recipes-devtools/python/python3-bcrypt_*.bb for an example
+##
+## To perform the update: bitbake -c update_crates recipe-name
+
+addtask do_update_crates after do_patch
+do_update_crates[depends] = "python3-native:do_populate_sysroot"
+do_update_crates[nostamp] = "1"
+do_update_crates[doc] = "Update the recipe by reading Cargo.lock and write in ${THISDIR}/${BPN}-crates.inc"
+
+RECIPE_UPGRADE_EXTRA_TASKS += "do_update_crates"
+
+# The directory where to search for Cargo.lock files
+CARGO_LOCK_SRC_DIR ??= "${S}"
+
+do_update_crates() {
+    TARGET_FILE="${THISDIR}/${BPN}-crates.inc"
+
+    nativepython3 - <<EOF
+
+def get_crates(f):
+    import tomllib
+    c_list = '# from %s' % os.path.relpath(f, '${CARGO_LOCK_SRC_DIR}')
+    c_list += '\nSRC_URI += " \\\'
+    crates = tomllib.load(open(f, 'rb'))
+
+    # Build a list with crates info that have crates.io in the source
+    crates_candidates = list(filter(lambda c: 'crates.io' in c.get('source', ''), crates['package']))
+
+    if not crates_candidates:
+        raise ValueError("Unable to find any candidate crates that use crates.io")
+
+    # Update crates uri and their checksum, to avoid name clashing on the checksum
+    # we need to rename crates with name and version to have a unique key
+    cksum_list = ''
+    for c in crates_candidates:
+        rename = "%s-%s" % (c['name'], c['version'])
+        c_list += '\n    crate://crates.io/%s/%s \\\' % (c['name'], c['version'])
+        if 'checksum' in c:
+            cksum_list += '\nSRC_URI[%s.sha256sum] = "%s"' % (rename, c['checksum'])
+
+    c_list += '\n"\n'
+    c_list += cksum_list
+    c_list += '\n'
+    return c_list
+
+import os
+crates = "# Autogenerated with 'bitbake -c update_crates ${PN}'\n\n"
+found = False
+for root, dirs, files in os.walk('${CARGO_LOCK_SRC_DIR}'):
+    # ignore git and patches directories
+    if root.startswith(os.path.join('${CARGO_LOCK_SRC_DIR}', '.pc')):
+        continue
+    if root.startswith(os.path.join('${CARGO_LOCK_SRC_DIR}', '.git')):
+        continue
+    for file in files:
+        if file == 'Cargo.lock':
+            try:
+                cargo_lock_path = os.path.join(root, file)
+                crates += get_crates(os.path.join(root, file))
+            except Exception as e:
+                raise ValueError("Cannot parse '%s'" % cargo_lock_path) from e
+            else:
+                found = True
+if not found:
+    raise ValueError("Unable to find any Cargo.lock in ${CARGO_LOCK_SRC_DIR}")
+open("${TARGET_FILE}", 'w').write(crates)
+EOF
+
+    bbnote "Successfully update crates inside '${TARGET_FILE}'"
+}