Make build-many-glibcs.py store more information about builds.

This patch makes build-many-glibcs.py store information about builds
in JSON format.  This is part of preparing it for use in a bot
checking for regressions.

The information stored is: time of last build (of host-libraries,
compilers or glibcs); versions of components used in the last build
(for compilers, host library versions are properly copied from those
used for the previous host-libraries build, and for glibcs, component
versions other than that of glibc are similarly copied from the last
compilers build); PASS/FAIL/UNRESOLVED results of the individual build
steps; a list of changed results; a list of tests (that are still run
at all) that have ever been recorded to PASS.

The first pieces of information are intended to be used by a bot to
decide whether a rebuild is appropriate (based on some combination of
elapsed time and changes to versions; a bot might want to rebuild
glibcs if there had been any change but only rebuild compilers after
enough time had elapsed, for example).  All the information is
intended to be used in generating mails with results information.

This state is specifically for full builds (no individual configs for
building compilers or glibcs specified).  If individual configs are
specified, build-time and build-versions information is cleared (since
it will no longer accurately reflect the install directory contents),
while the other information is left unchanged.  This reflects the
motivation of providing information for a bot checking for
regressions; the contents of build-state.json in a tree used for
manual builds that may be only for some configurations are not
particularly important.

	* scripts/build-many-glibcs.py: Import datetime module.
	(Context.__init__): Load JSON build state.  Initialize list of
	status logs.
	(Context.run_builds): Update saved build state.
	(Context.add_makefile_cmdlist): Update list of status logs.
	(Context.load_build_state_json): New function.
	(Context.store_build_state_json): Likewise.
	(Context.clear_last_build_state): Likewise.
	(Context.update_build_state): Likewise.
	(CommandList.status_logs): Likewise.

1 files changed, 111 insertions, 4 deletions

diff --git a/scripts/build-many-glibcs.py b/scripts/build-many-glibcs.py
index 3099415c17..d5355d851e 100755
--- a/scripts/build-many-glibcs.py
+++ b/scripts/build-many-glibcs.py
@@ -32,6 +32,7 @@ configurations for which compilers or glibc are to be built.
 """
 
 import argparse
+import datetime
 import json
 import os
 import re
@@ -53,6 +54,7 @@ class Context(object):
         self.replace_sources = replace_sources
         self.srcdir = os.path.join(topdir, 'src')
         self.versions_json = os.path.join(self.srcdir, 'versions.json')
+        self.build_state_json = os.path.join(topdir, 'build-state.json')
         self.installdir = os.path.join(topdir, 'install')
         self.host_libraries_installdir = os.path.join(self.installdir,
                                                       'host-libraries')
@@ -70,6 +72,8 @@ class Context(object):
         self.makefile_pieces = ['.PHONY: all\n']
         self.add_all_configs()
         self.load_versions_json()
+        self.load_build_state_json()
+        self.status_log_list = []
 
     def get_script_text(self):
         """Return the text of this script."""
@@ -388,17 +392,41 @@ class Context(object):
         if action == 'checkout':
             self.checkout(configs)
             return
-        elif action == 'host-libraries':
-            if configs:
-                print('error: configurations specified for host-libraries')
-                exit(1)
+        if action == 'host-libraries' and configs:
+            print('error: configurations specified for host-libraries')
+            exit(1)
+        self.clear_last_build_state(action)
+        build_time = datetime.datetime.utcnow()
+        if action == 'host-libraries':
+            build_components = ('gmp', 'mpfr', 'mpc')
+            old_components = ()
+            old_versions = {}
             self.build_host_libraries()
         elif action == 'compilers':
+            build_components = ('binutils', 'gcc', 'glibc', 'linux')
+            old_components = ('gmp', 'mpfr', 'mpc')
+            old_versions = self.build_state['host-libraries']['build-versions']
             self.build_compilers(configs)
         else:
+            build_components = ('glibc',)
+            old_components = ('gmp', 'mpfr', 'mpc', 'binutils', 'gcc', 'linux')
+            old_versions = self.build_state['compilers']['build-versions']
             self.build_glibcs(configs)
         self.write_files()
         self.do_build()
+        if configs:
+            # Partial build, do not update stored state.
+            return
+        build_versions = {}
+        for k in build_components:
+            if k in self.versions:
+                build_versions[k] = {'version': self.versions[k]['version'],
+                                     'revision': self.versions[k]['revision']}
+        for k in old_components:
+            if k in old_versions:
+                build_versions[k] = {'version': old_versions[k]['version'],
+                                     'revision': old_versions[k]['revision']}
+        self.update_build_state(action, build_time, build_versions)
 
     @staticmethod
     def remove_dirs(*args):
@@ -418,6 +446,7 @@ class Context(object):
         commands = cmdlist.makefile_commands(self.wrapper, logsdir)
         self.makefile_pieces.append('all: %s\n.PHONY: %s\n%s:\n%s\n' %
                                     (target, target, target, commands))
+        self.status_log_list.extend(cmdlist.status_logs(logsdir))
 
     def write_files(self):
         """Write out the Makefile and wrapper script."""
@@ -758,6 +787,79 @@ class Context(object):
                   self.component_srcdir(component))
         os.remove(filename)
 
+    def load_build_state_json(self):
+        """Load information about the state of previous builds."""
+        if os.access(self.build_state_json, os.F_OK):
+            with open(self.build_state_json, 'r') as f:
+                self.build_state = json.load(f)
+        else:
+            self.build_state = {}
+        for k in ('host-libraries', 'compilers', 'glibcs'):
+            if k not in self.build_state:
+                self.build_state[k] = {}
+            if 'build-time' not in self.build_state[k]:
+                self.build_state[k]['build-time'] = ''
+            if 'build-versions' not in self.build_state[k]:
+                self.build_state[k]['build-versions'] = {}
+            if 'build-results' not in self.build_state[k]:
+                self.build_state[k]['build-results'] = {}
+            if 'result-changes' not in self.build_state[k]:
+                self.build_state[k]['result-changes'] = {}
+            if 'ever-passed' not in self.build_state[k]:
+                self.build_state[k]['ever-passed'] = []
+
+    def store_build_state_json(self):
+        """Store information about the state of previous builds."""
+        self.store_json(self.build_state, self.build_state_json)
+
+    def clear_last_build_state(self, action):
+        """Clear information about the state of part of the build."""
+        # We clear the last build time and versions when starting a
+        # new build.  The results of the last build are kept around,
+        # as comparison is still meaningful if this build is aborted
+        # and a new one started.
+        self.build_state[action]['build-time'] = ''
+        self.build_state[action]['build-versions'] = {}
+        self.store_build_state_json()
+
+    def update_build_state(self, action, build_time, build_versions):
+        """Update the build state after a build."""
+        build_time = build_time.replace(microsecond=0)
+        self.build_state[action]['build-time'] = str(build_time)
+        self.build_state[action]['build-versions'] = build_versions
+        build_results = {}
+        for log in self.status_log_list:
+            with open(log, 'r') as f:
+                log_text = f.read()
+            log_text = log_text.rstrip()
+            m = re.fullmatch('([A-Z]+): (.*)', log_text)
+            result = m.group(1)
+            test_name = m.group(2)
+            assert test_name not in build_results
+            build_results[test_name] = result
+        old_build_results = self.build_state[action]['build-results']
+        self.build_state[action]['build-results'] = build_results
+        result_changes = {}
+        all_tests = set(old_build_results.keys()) | set(build_results.keys())
+        for t in all_tests:
+            if t in old_build_results:
+                old_res = old_build_results[t]
+            else:
+                old_res = '(New test)'
+            if t in build_results:
+                new_res = build_results[t]
+            else:
+                new_res = '(Test removed)'
+            if old_res != new_res:
+                result_changes[t] = '%s -> %s' % (old_res, new_res)
+        self.build_state[action]['result-changes'] = result_changes
+        old_ever_passed = {t for t in self.build_state[action]['ever-passed']
+                           if t in build_results}
+        new_passes = {t for t in build_results if build_results[t] == 'PASS'}
+        self.build_state[action]['ever-passed'] = sorted(old_ever_passed |
+                                                         new_passes)
+        self.store_build_state_json()
+
 
 class Config(object):
     """A configuration for building a compiler and associated libraries."""
@@ -1187,6 +1289,11 @@ class CommandList(object):
             cmds.append('\t@%s %s' % (prelim_txt, ctxt))
         return '\n'.join(cmds)
 
+    def status_logs(self, logsdir):
+        """Return the list of log files with command status."""
+        return [os.path.join(logsdir, '%s-status.txt' % c.logbase)
+                for c in self.cmdlist]
+
 
 def get_parser():
     """Return an argument parser for this module."""