ci: convert "pedantic" job into full build with breaking changes

The "pedantic" CI job is building on Fedora with `DEVOPTS=pedantic`.
This build flag doesn't do anything anymore starting with 6a8cbc41ba
(developer: enable pedantic by default, 2021-09-03), where we have
flipped the default so that developers have to opt-out of pedantic
builds via the "no-pedantic" option. As such, all this job really does
is to do a normal build on Fedora, which isn't all that interesting.

Convert that job into a full build-and-test job that uses Meson with
breaking changes enabled. This plugs two gaps:

  - We now test on another distro that we didn't run tests on
    beforehand.

  - We verify that breaking changes work as expected with Meson.

Furthermore, in a subsequent commit we'll modify both jobs that use
breaking changes to also enable Rust. By converting the Fedora job to
use Meson, we ensure that we test our Rust build infrastructure for both
build systems.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

.github/workflows/main.yml

@@ -379,6 +379,8 @@ jobs:
         - jobname: linux-breaking-changes
           cc: gcc
           image: ubuntu:rolling
+        - jobname: fedora-breaking-changes-meson
+          image: fedora:latest
         - jobname: linux-leaks
           image: ubuntu:rolling
           cc: gcc
@@ -396,8 +398,6 @@ jobs:
         # Supported until 2025-04-02.
         - jobname: linux32
           image: i386/ubuntu:focal
-        - jobname: pedantic
-          image: fedora:latest
         # A RHEL 8 compatible distro.  Supported until 2029-05-31.
         - jobname: almalinux-8
           image: almalinux:8

.gitlab-ci.yml

@@ -45,6 +45,8 @@ test:linux:
       - jobname: linux-breaking-changes
         image: ubuntu:20.04
         CC: gcc
+      - jobname: fedora-breaking-changes-meson
+        image: fedora:latest
       - jobname: linux-TEST-vars
         image: ubuntu:20.04
         CC: gcc
@@ -58,8 +60,6 @@ test:linux:
       - jobname: linux-asan-ubsan
         image: ubuntu:rolling
         CC: clang
-      - jobname: pedantic
-        image: fedora:latest
       - jobname: linux-musl-meson
         image: alpine:latest
       - jobname: linux32

ci/install-dependencies.sh

@@ -30,8 +30,12 @@ alpine-*)
 		bash cvs gnupg perl-cgi perl-dbd-sqlite perl-io-tty >/dev/null
 	;;
 fedora-*|almalinux-*)
+	case "$jobname" in
+	*-meson)
+		MESON_DEPS="meson ninja";;
+	esac
 	dnf -yq update >/dev/null &&
-	dnf -yq install shadow-utils sudo make gcc findutils diffutils perl python3 gawk gettext zlib-devel expat-devel openssl-devel curl-devel pcre2-devel >/dev/null
+	dnf -yq install shadow-utils sudo make pkg-config gcc findutils diffutils perl python3 gawk gettext zlib-devel expat-devel openssl-devel curl-devel pcre2-devel $MESON_DEPS >/dev/null
 	;;
 ubuntu-*|i386/ubuntu-*|debian-*)
 	# Required so that apt doesn't wait for user input on certain packages.

ci/run-build-and-tests.sh

@@ -5,12 +5,11 @@
 
 . ${0%/*}/lib.sh
 
-run_tests=t
-
 case "$jobname" in
-linux-breaking-changes)
+fedora-breaking-changes-musl|linux-breaking-changes)
 	export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 	export WITH_BREAKING_CHANGES=YesPlease
+	MESONFLAGS="$MESONFLAGS -Dbreaking_changes=true"
 	;;
 linux-TEST-vars)
 	export OPENSSL_SHA1_UNSAFE=YesPlease
@@ -36,12 +35,6 @@ linux-sha256)
 linux-reftable|linux-reftable-leaks|osx-reftable)
 	export GIT_TEST_DEFAULT_REF_FORMAT=reftable
 	;;
-pedantic)
-	# Don't run the tests; we only care about whether Git can be
-	# built.
-	export DEVOPTS=pedantic
-	run_tests=
-	;;
 esac
 
 case "$jobname" in
@@ -54,21 +47,15 @@ case "$jobname" in
 		-Dtest_output_directory="${TEST_OUTPUT_DIRECTORY:-$(pwd)/t}" \
 		$MESONFLAGS
 	group "Build" meson compile -C build --
-	if test -n "$run_tests"
-	then
-		group "Run tests" meson test -C build --print-errorlogs --test-args="$GIT_TEST_OPTS" || (
-			./t/aggregate-results.sh "${TEST_OUTPUT_DIRECTORY:-t}/test-results"
-			handle_failed_tests
-		)
-	fi
+	group "Run tests" meson test -C build --print-errorlogs --test-args="$GIT_TEST_OPTS" || (
+		./t/aggregate-results.sh "${TEST_OUTPUT_DIRECTORY:-t}/test-results"
+		handle_failed_tests
+	)
 	;;
 *)
 	group Build make
-	if test -n "$run_tests"
-	then
-		group "Run tests" make test ||
-		handle_failed_tests
-	fi
+	group "Run tests" make test ||
+	handle_failed_tests
 	;;
 esac