prserv: handle PRSERV_HOST = "127.0.0.1:0" the same as "localhost:0"

* When using PRSERV_HOST = "localhost:0" inside
  Docker container (tested with ubuntu 20.04 and 21.04) the
  self.loop.run_until_complete never completed, so self.address
  wasn't ever assigned few lines bellow and then
    self.port = int(self.prserv.address.rsplit(':', 1)[1])
  in lib/prserv/serv.py caused a bit ugly exception:

bitbake@599696cd20aa:~/nodistro/honister$ bitbake -k pkgconfig-native
Traceback (most recent call last):
  File "/OE/nodistro/honister/bitbake/bin/bitbake", line 35, in <module>
    sys.exit(bitbake_main(BitBakeConfigParameters(sys.argv),
  File "/OE/nodistro/honister/bitbake/lib/bb/main.py", line 385, in bitbake_main
    return ui_module.main(server_connection.connection, server_connection.events,
  File "/OE/nodistro/honister/bitbake/lib/bb/ui/knotty.py", line 397, in main
    params.updateToServer(server, os.environ.copy())
  File "/OE/nodistro/honister/bitbake/lib/bb/cookerdata.py", line 75, in updateToServer
    raise Exception("Unable to update the server configuration with local parameters: %s" % error)
Exception: Unable to update the server configuration with local parameters: Traceback (most recent call last):
  File "/OE/nodistro/honister/bitbake/lib/bb/command.py", line 90, in runCommand
    result = command_method(self, commandline)
  File "/OE/nodistro/honister/bitbake/lib/bb/command.py", line 286, in updateConfig
    command.cooker.updateConfigOpts(options, environment, cmdline)
  File "/OE/nodistro/honister/bitbake/lib/bb/cooker.py", line 491, in updateConfigOpts
    self.reset()
  File "/OE/nodistro/honister/bitbake/lib/bb/cooker.py", line 1717, in reset
    self.handlePRServ()
  File "/OE/nodistro/honister/bitbake/lib/bb/cooker.py", line 383, in handlePRServ
    self.prhost = prserv.serv.auto_start(self.data)
  File "/OE/nodistro/honister/bitbake/lib/prserv/serv.py", line 318, in auto_start
    singleton.start()
  File "/OE/nodistro/honister/bitbake/lib/prserv/serv.py", line 133, in start
    self.port = int(self.prserv.address.rsplit(':', 1)[1])
AttributeError: 'NoneType' object has no attribute 'rsplit'

* the issue was caused by "localhost" being resolved as IPv6 address ::1
  and then asyncio failing to bind it, the same is reproducible with hashserv, but
  hashserve at least shows nice error message:
    bitbake$ bitbake-hashserv -l DEBUG -b localhost:0
    Traceback (most recent call last):
      File "/OE/nodistro/honister/bitbake/bin/bitbake-hashserv", line 59, in <module>
        ret = main()
      File "/OE/nodistro/honister/bitbake/bin/bitbake-hashserv", line 53, in main
        server.serve_forever()
      File "/OE/nodistro/honister/bitbake/lib/bb/asyncrpc/serv.py", line 233, in serve_forever
        self.start()
      File "/OE/nodistro/honister/bitbake/lib/bb/asyncrpc/serv.py", line 144, in start_tcp
        self.server = self.loop.run_until_complete(server_coro)
      File "/usr/lib/python3.8/asyncio/base_events.py", line 616, in run_until_complete
        return future.result()
      File "/usr/lib/python3.8/asyncio/streams.py", line 94, in start_server
        return await loop.create_server(factory, host, port, **kwds)
      File "/usr/lib/python3.8/asyncio/base_events.py", line 1463, in create_server
        raise OSError(err.errno, 'error while attempting '
    OSError: [Errno 99] error while attempting to bind on address ('::1', 0, 0, 0): cannot assign requested address

* or by bitbake-prserv in prserv.log:
    bitbake$ bitbake-prserv --start --host=localhost --port=42005
    bitbake$ cat prserv.log
    Traceback (most recent call last):
      File "/OE/nodistro/honister/bitbake/bin/bitbake-prserv", line 55, in <module>
        ret = main()
      File "/OE/nodistro/honister/bitbake/bin/bitbake-prserv", line 46, in main
        ret=prserv.serv.start_daemon(options.dbfile, options.host, options.port,os.path.abspath(options.logfile), options.read_only)
      File "/OE/nodistro/honister/bitbake/lib/prserv/serv.py", line 226, in start_daemon
        run_as_daemon(daemon_main, pidfile, os.path.abspath(logfile))
      File "/OE/nodistro/honister/bitbake/lib/prserv/serv.py", line 202, in run_as_daemon
        func()
      File "/OE/nodistro/honister/bitbake/lib/prserv/serv.py", line 224, in daemon_main
        server.serve_forever()
      File "/OE/nodistro/honister/bitbake/lib/bb/asyncrpc/serv.py", line 233, in serve_forever
        self.start()
      File "/OE/nodistro/honister/bitbake/lib/bb/asyncrpc/serv.py", line 144, in start_tcp
        self.server = self.loop.run_until_complete(server_coro)
      File "/usr/lib/python3.8/asyncio/base_events.py", line 616, in run_until_complete
        return future.result()
      File "/usr/lib/python3.8/asyncio/streams.py", line 94, in start_server
        return await loop.create_server(factory, host, port, **kwds)
      File "/usr/lib/python3.8/asyncio/base_events.py", line 1463, in create_server
        raise OSError(err.errno, 'error while attempting '
    OSError: [Errno 99] error while attempting to bind on address ('::1', 42005, 0, 0): cannot assign requested address

* while 127.0.0.1 works fine:
    bitbake$ bitbake-prserv --start --host=127.0.0.1 --port=42005
    bitbake$ cat prserv.log
    DEBUG: Listening on ('127.0.0.1', 42005)
    2021-08-26 22:28:05,828 Listening on ('127.0.0.1', 42005)
    DEBUG: Opening PRServ database 'file:/OE/nodistro/honister/prserv.sqlite3'
    2021-08-26 22:28:05,829 Opening PRServ database 'file:/OE/nodistro/honister/prserv.sqlite3'
    NOTE: Started PRServer with DBfile: /OE/nodistro/honister/prserv.sqlite3, Address: 127.0.0.1:42005, PID: 39
    2021-08-26 22:28:05,831 Started PRServer with DBfile: /OE/nodistro/honister/prserv.sqlite3, Address: 127.0.0.1:42005, PID: 39

  but 127.0.0.1:0 wasn't handled as "autostart" like localhost:0 is
  update is_local_special to allow that

* /etc/hosts file generated by docker contails localhost for both IPv4 and IPv6:
  $ grep localhost /etc/hosts
  127.0.0.1       localhost
  ::1     localhost ip6-localhost ip6-loopback

  even when ipv6 is disabled in dockerd as reported in:
  https://github.com/docker/for-linux/issues/250

* add a check for self.prserv.address to provide better error message:
  ERROR: Unable to start PR Server, exitting
  when something bad happens, but in this case you still need to read
  bitbake-cookerdaemon.log to see the actuall error, in this case:

90 22:30:39.008441 --- Starting bitbake server pid 90 at 2021-08-26 22:30:39.008419 ---
90 22:30:39.023734 Started bitbake server pid 90
90 22:30:39.024286 Entering server connection loop
90 22:30:39.024753 Accepting [<socket.socket fd=6, family=AddressFamily.AF_UNIX, type=SocketKind.SOCK_STREAM, proto=0, laddr=bitbake.sock>] ([])
90 22:30:39.026314 Processing Client
90 22:30:39.026456 Connecting Client
90 22:30:39.027509 Running command ['setFeatures', [2]]
90 22:30:39.027757 Command Completed
90 22:30:39.028711 Running command ['updateConfig', {'abort': False, 'force': False, 'invalidate_stamp': None, 'dry_run': False, 'dump_signatures': [], 'extra_assume_provided': [], 'profile': False, 'prefile': [], 'postfile': [], 'server_timeout': None, 'nosetscene': False, 'setsceneonly': False, 'skipsetscene': False, 'runall': None, 'runonly': None, 'writeeventlog': None, 'build_verbose_shell': False, 'build_verbose_stdout': False, 'default_loglevel': 20, 'debug_domains': {}}, {'DISTRO': '', 'PWD': '/OE/nodistro/honister', 'HOME': '/OE', 'MACHINE': 'qemux86', 'BB_ENV_EXTRAWHITE': 'MACHINE DISTRO TCMODE TCLIBC http_proxy ftp_proxy https_proxy all_proxy ALL_PROXY no_proxy SSH_AGENT_PID SSH_AUTH_SOCK BB_SRCREV_POLICY SDKMACHINE BB_NUMBER_THREADS PARALLEL_MAKE GIT_PROXY_COMMAND GIT_PROXY_IGNORE SOCKS5_PASSWD SOCKS5_USER WEBOS_DISTRO_BUILD_ID PSEUDO_DISABLED PSEUDO_BUILD', 'PATH': '/OE/nodistro/honister/oe-core/scripts:/OE/nodistro/honister/bitbake/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin', 'LC_ALL': 'en_US.UTF-8', 'MACHINES': 'qemux86', 'HOSTNAME': '6a439759e3c6', 'TOPDIR': '/OE/nodistro/honister', 'LANG': 'en_US.UTF-8', 'TERM': 'xterm', 'SHLVL': '1', 'BITBAKE_HOME': '/OE', 'BUILDDIR': '/OE/nodistro/honister/BUILD', 'OLDPWD': '/OE/nodistro/honister/bitbake', '_': '/OE/nodistro/honister/bitbake/bin/bitbake'}, ['/OE/nodistro/honister/bitbake/bin/bitbake', '-k', 'zlib-native']]
Process Process-1:
Traceback (most recent call last):
  File "/usr/lib/python3.8/multiprocessing/process.py", line 315, in _bootstrap
    self.run()
  File "/usr/lib/python3.8/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "/OE/nodistro/honister/bitbake/lib/bb/asyncrpc/serv.py", line 255, in run
    self.start()
  File "/OE/nodistro/honister/bitbake/lib/bb/asyncrpc/serv.py", line 144, in start_tcp
    self.server = self.loop.run_until_complete(server_coro)
  File "/usr/lib/python3.8/asyncio/base_events.py", line 616, in run_until_complete
    return future.result()
  File "/usr/lib/python3.8/asyncio/streams.py", line 94, in start_server
    return await loop.create_server(factory, host, port, **kwds)
  File "/usr/lib/python3.8/asyncio/base_events.py", line 1463, in create_server
    raise OSError(err.errno, 'error while attempting '
OSError: [Errno 99] error while attempting to bind on address ('::1', 0, 0, 0): cannot assign requested address
90 22:30:39.530037 Command Completed
90 22:30:39.530913 Processing Client
90 22:30:39.531023 Disconnecting Client
90 22:30:39.531638 No timeout, exiting.
90 22:30:39.632137 Exiting
90 22:30:39.637562 Original lockfile contents: ['90\n']
90 22:30:39.638107 Exiting as we could obtain the lock

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 8 insertions, 7 deletions

diff --git a/lib/bb/cooker.py b/lib/bb/cooker.py
index b2d69c28c..55eed0925 100644
--- a/lib/bb/cooker.py
+++ b/lib/bb/cooker.py
@@ -382,7 +382,7 @@ class BBCooker:
         try:
             self.prhost = prserv.serv.auto_start(self.data)
         except prserv.serv.PRServiceConfigError as e:
-            bb.fatal("Unable to start PR Server, exitting")
+            bb.fatal("Unable to start PR Server, exitting, check the bitbake-cookerdaemon.log")
 
         if self.data.getVar("BB_HASHSERVE") == "auto":
             # Create a new hash server bound to a unix domain socket
diff --git a/lib/prserv/serv.py b/lib/prserv/serv.py
index 17ae40967..68db3d3ec 100644
--- a/lib/prserv/serv.py
+++ b/lib/prserv/serv.py
@@ -129,6 +129,8 @@ class PRServSingleton(object):
         self.prserv.start_tcp_server(self.host, self.port)
         self.process = self.prserv.serve_as_process()
 
+        if not self.prserv.address:
+            raise PRServiceConfigError
         if not self.port:
             self.port = int(self.prserv.address.rsplit(':', 1)[1])
 
@@ -276,7 +278,7 @@ def is_running(pid):
     return True
 
 def is_local_special(host, port):
-    if host.strip().lower() == 'localhost' and not port:
+    if (host == 'localhost' or host == '127.0.0.1') and not port:
         return True
     else:
         return False
@@ -300,7 +302,9 @@ def auto_start(d):
                 'Usage: PRSERV_HOST = "<hostname>:<port>"']))
         raise PRServiceConfigError
 
-    if is_local_special(host_params[0], int(host_params[1])):
+    host = host_params[0].strip().lower()
+    port = int(host_params[1])
+    if is_local_special(host, port):
         import bb.utils
         cachedir = (d.getVar("PERSISTENT_DIR") or d.getVar("CACHE"))
         if not cachedir:
@@ -314,14 +318,11 @@ def auto_start(d):
                auto_shutdown()
         if not singleton:
             bb.utils.mkdirhier(cachedir)
-            singleton = PRServSingleton(os.path.abspath(dbfile), os.path.abspath(logfile), "localhost", 0)
+            singleton = PRServSingleton(os.path.abspath(dbfile), os.path.abspath(logfile), host, port)
             singleton.start()
     if singleton:
         host = singleton.host
         port = singleton.port
-    else:
-        host = host_params[0]
-        port = int(host_params[1])
 
     try:
         ping(host, port)