[PATCH 012/142] meson: add testsuite Makefile generator

[Paolo Bonzini <pbonzini@redhat.com>]

Rules to execute tests are generated by a simple Python program
that integrates into the existing "make check" mechanism.  This
provides familiarity for developers, and also allows piecewise
conversion of the testsuite Makefiles to meson.

The generated rules are based on QEMU's existing test harness
Makefile and TAP parser.
---
 Makefile               |   4 ++
 scripts/mtest2make.py  | 101 +++++++++++++++++++++++++++++++++++++++++
 tests/Makefile.include |   1 -
 3 files changed, 105 insertions(+), 1 deletion(-)
 create mode 100644 scripts/mtest2make.py

diff --git a/Makefile b/Makefile
index 9aa0808649..fee6f739fd 100644
--- a/Makefile
+++ b/Makefile
@@ -61,6 +61,10 @@ ninjatool: ninjatool.stamp
 ninjatool.stamp: $(SRC_PATH)/scripts/ninjatool.py
 	$(MESON) setup --reconfigure . $(SRC_PATH) && touch $@
 
+Makefile.mtest: build.ninja scripts/mtest2make.py
+	$(MESON) introspect --tests | $(PYTHON) scripts/mtest2make.py > $@
+-include Makefile.mtest
+
 .git-submodule-status: git-submodule-update config-host.mak
 
 # Check that we're not trying to do an out-of-tree build from
diff --git a/scripts/mtest2make.py b/scripts/mtest2make.py
new file mode 100644
index 0000000000..ac4010ff8f
--- /dev/null
+++ b/scripts/mtest2make.py
@@ -0,0 +1,101 @@
+#! /usr/bin/env python3
+
+# Create Makefile targets to run tests, from Meson's test introspection data.
+#
+# Author: Paolo Bonzini <pbonzini@redhat.com>
+
+from collections import defaultdict
+import json
+import os
+import shlex
+import sys
+
+class Suite(object):
+    def __init__(self):
+        self.tests = list()
+        self.slow_tests = list()
+        self.executables = set()
+
+print('''
+SPEED = quick
+
+# $1 = test command, $2 = test name
+.test-human-tap = $1 < /dev/null | ./scripts/tap-driver.pl --test-name="$2" $(if $(V),, --show-failures-only)
+.test-human-exitcode = $1 < /dev/null $(if $(V),,> /dev/null 2>&1)
+.test-tap-tap = $1 < /dev/null | sed "s/^[a-z][a-z]* [0-9]*/& $2/" || true
+.test-tap-exitcode = printf "%s\\n" 1..1 "`$1 < /dev/null > /dev/null || echo "not "`ok 1 $2"
+.test.print = echo $(if $(V),'$1','Running test $2') >&3
+.test.env = MALLOC_PERTURB_=$${MALLOC_PERTURB_:-$$(( $${RANDOM:-0} % 255 + 1))}
+
+# $1 = test name, $2 = test target (human or tap)
+.test.run = $(call .test.print,$(.test.cmd.$1),$(.test.name.$1)) && $(call .test-$2-$(.test.driver.$1),$(.test.cmd.$1),$(.test.name.$1))
+
+define .test.human_k
+        @exec 3>&1; rc=0; $(foreach TEST, $1, $(call .test.run,$(TEST),human) || rc=$$?;) \\
+              exit $$rc
+endef
+define .test.human_no_k
+        $(foreach TEST, $1, @exec 3>&1; $(call .test.run,$(TEST),human)
+)
+endef
+.test.human = \\
+        $(if $(findstring k, $(MAKEFLAGS)), $(.test.human_k), $(.test.human_no_k))
+
+define .test.tap
+        @exec 3>&1; { $(foreach TEST, $1, $(call .test.run,$(TEST),tap); ) } \\
+              | ./scripts/tap-merge.pl | tee "$@" \\
+              | ./scripts/tap-driver.pl $(if $(V),, --show-failures-only)
+endef
+''')
+
+suites = defaultdict(Suite)
+i = 0
+for test in json.load(sys.stdin):
+    env = ' '.join(('%s=%s' % (shlex.quote(k), shlex.quote(v))
+                    for k, v in test['env'].items()))
+    executable = os.path.relpath(test['cmd'][0])
+    if test['workdir'] is not None:
+        test['cmd'][0] = os.path.relpath(test['cmd'][0], test['workdir'])
+    else:
+        test['cmd'][0] = executable
+    cmd = '$(.test.env) %s %s' % (env, ' '.join((shlex.quote(x) for x in test['cmd'])))
+    if test['workdir'] is not None:
+        cmd = '(cd %s && %s)' % (shlex.quote(test['workdir']), cmd)
+    driver = test['protocol'] if 'protocol' in test else 'exitcode'
+
+    i += 1
+    print('.test.name.%d := %s' % (i, test['name']))
+    print('.test.driver.%d := %s' % (i, driver))
+    print('.test.cmd.%d := %s' % (i, cmd))
+
+    test_suites = test['suite'] or ['default']
+    is_slow = 'slow' in test_suites
+    for s in test_suites:
+        if s == 'slow':
+            continue
+        # The suite name in the introspection info is "PROJECT:SUITE"
+        s = s.split(':')[1]
+        if is_slow:
+            suites[s].slow_tests.append(i)
+        else:
+            suites[s].tests.append(i)
+        suites[s].executables.add(executable)
+
+print('.PHONY: check check-report.tap')
+print('check:')
+print('check-report.tap:')
+print('\t$(call quiet-command, cat $^ | scripts/tap-merge.pl >$@,"GEN","$@")')
+for name, suite in suites.items():
+    executables = ' '.join(suite.executables)
+    slow_test_numbers = ' '.join((str(x) for x in suite.slow_tests))
+    test_numbers = ' '.join((str(x) for x in suite.tests))
+    print('.test.suite-quick.%s := %s' % (name, test_numbers))
+    print('.test.suite-slow.%s := $(.test.suite-quick.%s) %s' % (name, name, slow_test_numbers))
+    print('.PHONY: check-%s' % name)
+    print('.PHONY: check-report-%s.tap' % name)
+    print('check: check-%s' % name)
+    print('check-%s: %s' % (name, executables))
+    print('\t$(call .test.human, $(.test.suite-$(SPEED).%s))' % (name, ))
+    print('check-report.tap: check-report-%s.tap' % name)
+    print('check-report-%s.tap: %s' % (name, executables))
+    print('\t$(call .test.tap, $(.test.suite-$(SPEED).%s))' % (name, ))
diff --git a/tests/Makefile.include b/tests/Makefile.include
index 9146e1bdee..eaa57196f9 100644
--- a/tests/Makefile.include
+++ b/tests/Makefile.include
@@ -936,7 +936,6 @@ check-report-unit.tap: $(check-unit-y)
 # Reports and overall runs
 
 check-report.tap: $(patsubst %,check-report-qtest-%.tap, $(QTEST_TARGETS)) check-report-unit.tap
-	$(call quiet-command, cat $^ | scripts/tap-merge.pl >$@,"GEN","$@")
 
 # FPU Emulation tests (aka softfloat)
 #
-- 
2.21.0