vppapigen: api crc checker

crcchecker is a tool for enforcement of the binary API.

1. Production APIs should never change.
2. An API can be deprecated across three release cycles.
   Release 1: API is marked as deprecated.
   option deprecated="vyy.mm";
   option replaced_by="new_api_2";
   Release 2: both old and new APIs are supported
   Release 3: the deprecated API is deleted.
3. APIs that are experimental / not released are not checked.
   An API message can be individually marked as in progress, by:
   option status="in_progress";
   In the API definition.

The definition of a "production API" is if the major version in the API file is > 0.

extras/scripts/crcchecker.py --check-patchset # returns -1 if backwards incompatible
extras/scripts/crcchecker.py --dump-manifest
extras/scripts/crcchecker.py --git-revision v20.01 <files>
extras/scripts/crcchecker.py -- diff <oldfile> <newfile>

This patch integrates the tool in "make checkstyle-api".
A future patch is required to integrate the tool in the verify job.
I.e. this patch does not enable enforcement through Jenkins.

Change-Id: I5f13c0976d8a12a58131b3e270f2dc9c00dc7d8c
Type: feature
Signed-off-by: Ole Troan <ot@cisco.com>

1 files changed, 140 insertions, 0 deletions

diff --git a/extras/scripts/tests/test_crcchecker.sh b/extras/scripts/tests/test_crcchecker.sh
new file mode 100755
index 00000000000..7cfda086483
--- /dev/null
+++ b/extras/scripts/tests/test_crcchecker.sh
@@ -0,0 +1,140 @@
+#!/bin/sh
+set -eux
+
+TMPDIR=$(mktemp -d /tmp/vpp-crccheck-test-XXXXX)
+
+CURR_ROOT=$(git rev-parse --show-toplevel)
+CURR_DIR=$(pwd)
+
+verify_check_patchset_fails() {
+	if (extras/scripts/crcchecker.py --check-patchset); then
+		echo "ERROR - check succeeded, it should have failed!"
+		exit 1;
+	fi
+}
+
+finish() {
+	if [ -e "$TMPDIR" ]; then
+		echo "Temporary directory is: $TMPDIR"
+	fi
+}
+trap finish EXIT
+
+
+# make a copy of the current repo that we can play with
+cd ${TMPDIR}
+mkdir misc-files
+git clone ${CURR_ROOT} vpp-uut
+cd vpp-uut
+
+# maybe grab the CRC checker
+# git fetch "https://gerrit.fd.io/r/vpp" refs/changes/81/26881/14 && git cherry-pick FETCH_HEAD || echo "Already there"
+
+
+echo "TEST 1: Check the current patchset..."
+extras/scripts/crcchecker.py --check-patchset
+
+echo "TEST 2: Dumping the current manifest..."
+extras/scripts/crcchecker.py --dump-manifest >${TMPDIR}/misc-files/manifest.txt
+
+echo "TEST 3: Checking the 20.01 version of acl.api...."
+extras/scripts/crcchecker.py --git-revision v20.01 src/plugins/acl/acl.api
+
+echo "TEST 4: Add a new field into a message in acl.api, and check patchset - must fail..."
+sed -i -e 's#vpe_pid;#vpe_pid; u32 sneaky_new_field;#' src/plugins/acl/acl.api
+verify_check_patchset_fails
+
+echo "TEST 5: Rename the changed acl.api file and not add it to git... must fail (due to deletion of the APIs)..."
+mv src/plugins/acl/acl.api src/plugins/acl/acl_new.api
+verify_check_patchset_fails
+
+echo "TEST 6: Add the renamed file to git commit... must fail (due to addition of the fields)..."
+git add src/plugins/acl/acl_new.api
+git commit -m "added acl_new.api"
+verify_check_patchset_fails
+
+echo "TEST 7: Verify we can delete deprecated message"
+git commit -a -m "reset"
+cat >crccheck.api <<EOL
+option version="1.0.0";
+autoreply define crccheck
+{
+  option deprecated="v20.11";
+  bool foo;
+};
+EOL
+git add crccheck.api
+git commit -m "deprecated api";
+# delete API
+cat >crccheck.api <<EOL
+option version="1.0.0";
+autoreply define crccheck_2
+{
+  bool foo;
+};
+EOL
+git add crccheck.api
+git commit -m "deprecated api";
+extras/scripts/crcchecker.py --check-patchset
+
+echo "TEST 8: Verify that we can not rename a non-deprecated message"
+sed -i -e 's/crccheck_2/crccheck_3/g' crccheck.api
+git add crccheck.api
+git commit -m "renamed api";
+verify_check_patchset_fails
+# fix it.
+sed -i -e 's/crccheck_3/crccheck_2/g' crccheck.api
+git commit -a --amend -m "empty commit after we renamed api back" --allow-empty
+
+echo "TEST 9: Verify that the check fails if the changes are not committed"
+cat >>crccheck.api <<EOL
+autoreply define crc_new_check_in_progress
+{
+  option status="in_progress";
+  bool foobar;
+};
+EOL
+verify_check_patchset_fails
+
+echo "TEST10: Verify that the in-progress message can be added"
+git add crccheck.api
+git commit -m "added a new in-progress api";
+extras/scripts/crcchecker.py --check-patchset
+
+echo "TEST11: Verify we can rename an in-progress API"
+sed -i -e 's/crc_new_check_in_progress/crc_new_check_in_progress_2/g' crccheck.api
+git add crccheck.api
+git commit -m "renamed in-progress api";
+extras/scripts/crcchecker.py --check-patchset
+
+echo "TEST12: Verify we can add a field to an in-progress API"
+sed -i -e 's/foobar;/foobar; bool new_baz;/g' crccheck.api
+git add crccheck.api
+git commit -m "new field added in in-progress api";
+extras/scripts/crcchecker.py --check-patchset
+
+echo "TEST13: Verify we fail the check if the file can not be compiled"
+cat >crccheck2.api <<EOL
+option version="0.0.1";
+autoreply define spot_the_error
+{
+  option status="in_progress"
+  bool something_important;
+};
+EOL
+git add crccheck2.api
+git commit -m "a new message with a syntax error";
+verify_check_patchset_fails
+
+# get rid of the "erroneous" commit in the previous test
+git reset --hard HEAD~1
+
+echo "TEST: All tests got the expected result, cleaning up."
+
+# done with all the tests - clean up
+cd ${CURR_DIR}
+
+# beware of empty variables, careful with deletion
+rm -rf ${TMPDIR}/vpp-uut
+rm -rf ${TMPDIR}/misc-files
+rmdir ${TMPDIR}