tests: make test-serve works on system that allow user to bind low port

It is possible to encounter linux system configured in a way that allow port
< 1024 to be bound by any users. So we update a test to focus more on the actual
test: "resolving `daytime` to an actual port number.

The new auto-scaling CI runner provided by clever cloud is doing so. This is the
initial motivation for this change, but it seems useful anyway.

Differential Revision: https://phab.mercurial-scm.org/D11228

tests/test-serve.t

@@ -1,112 +1,119 b''
 #require serve
 
   $ hgserve()
   > {
   >    hg serve -a localhost -d --pid-file=hg.pid -E errors.log -v $@ \
   >        | sed -e "s/:$HGPORT1\\([^0-9]\\)/:HGPORT1\1/g" \
   >              -e "s/:$HGPORT2\\([^0-9]\\)/:HGPORT2\1/g" \
   >              -e 's/http:\/\/[^/]*\//http:\/\/localhost\//'
   >    if [ -f hg.pid ]; then
   >        killdaemons.py hg.pid
   >    fi
   >    echo % errors
   >    cat errors.log
   > }
 
   $ hg init test
   $ cd test
   $ echo '[web]' > .hg/hgrc
   $ echo 'accesslog = access.log' >> .hg/hgrc
   $ echo "port = $HGPORT1" >> .hg/hgrc
 
 Without -v
 
   $ hg serve -a localhost -p $HGPORT -d --pid-file=hg.pid -E errors.log
   $ cat hg.pid >> "$DAEMON_PIDS"
   $ if [ -f access.log ]; then
   >     echo 'access log created - .hg/hgrc respected'
   > fi
   access log created - .hg/hgrc respected
 
 errors
 
   $ cat errors.log
 
 With -v
 
   $ hgserve
   listening at http://localhost/ (bound to *$LOCALIP*:HGPORT1) (glob) (?)
   % errors
 
 With -v and -p HGPORT2
 
   $ hgserve -p "$HGPORT2"
   listening at http://localhost/ (bound to *$LOCALIP*:HGPORT2) (glob) (?)
   % errors
 
-With -v and -p daytime (should fail because low port)
+With -v and -p daytime
 
-#if no-root no-windows
+# On some system this will fails because port < 1024 are not bindable by normal
+# users.
+#
+# On some others the kernel is configured to allow any user to bind them and
+# this will work fine
+
+#if no-windows
   $ KILLQUIETLY=Y
   $ hgserve -p daytime
-  abort: cannot start server at 'localhost:13': Permission denied
-  abort: child process failed to start
+  abort: cannot start server at 'localhost:13': Permission denied (?)
+  abort: child process failed to start (?)
+  listening at http://localhost/ (bound to $LOCALIP:13) (?)
   % errors
   $ KILLQUIETLY=N
 #endif
 
 With --prefix foo
 
   $ hgserve --prefix foo
   listening at http://localhost/foo/ (bound to *$LOCALIP*:HGPORT1) (glob) (?)
   % errors
 
 With --prefix /foo
 
   $ hgserve --prefix /foo
   listening at http://localhost/foo/ (bound to *$LOCALIP*:HGPORT1) (glob) (?)
   % errors
 
 With --prefix foo/
 
   $ hgserve --prefix foo/
   listening at http://localhost/foo/ (bound to *$LOCALIP*:HGPORT1) (glob) (?)
   % errors
 
 With --prefix /foo/
 
   $ hgserve --prefix /foo/
   listening at http://localhost/foo/ (bound to *$LOCALIP*:HGPORT1) (glob) (?)
   % errors
 
   $ "$PYTHON" $RUNTESTDIR/killdaemons.py $DAEMON_PIDS
 
 With out of bounds accesses
 
   $ rm access.log
   $ hg serve -a localhost -p $HGPORT -d --prefix some/dir \
   >    --pid-file=hg.pid -E errors.log
   $ cat hg.pid >> "$DAEMON_PIDS"
 
   $ hg id http://localhost:$HGPORT/some/dir7
   abort: HTTP Error 404: Not Found
   [100]
   $ hg id http://localhost:$HGPORT/some
   abort: HTTP Error 404: Not Found
   [100]
 
   $ cat access.log errors.log
   $LOCALIP - - [$LOGDATE$] "GET /some/dir7?cmd=capabilities HTTP/1.1" 404 - (glob)
   $LOCALIP - - [$LOGDATE$] "GET /some?cmd=capabilities HTTP/1.1" 404 - (glob)
 
   $ "$PYTHON" $RUNTESTDIR/killdaemons.py $DAEMON_PIDS
 
 issue6362: Previously, this crashed on Python 3
 
   $ hg serve -a 0.0.0.0 -d --pid-file=hg.pid
   listening at http://*:$HGPORT1/ (bound to *:$HGPORT1) (glob) (?)
 
   $ cat hg.pid > "$DAEMON_PIDS"
   $ "$PYTHON" $RUNTESTDIR/killdaemons.py $DAEMON_PIDS
 
   $ cd ..