run-tests: allow to specify executable of any name by --with-hg

run-tests: allow to specify executable of any name by --with-hg

If the executable is not named as "hg", TTest runner inserts alias. This
way, we can run tests with chg. But it is still warned because the alias
does not always work. We do "$BINDIR"/hg in a few places.

--- a/tests/run-tests.py	Sun Feb 07 16:02:41 2016 +0900
+++ b/tests/run-tests.py	Sun Feb 07 15:21:39 2016 +0900
@@ -444,7 +444,7 @@
                  debug=False,
                  timeout=defaults['timeout'],
                  startport=defaults['port'], extraconfigopts=None,
-                 py3kwarnings=False, shell=None,
+                 py3kwarnings=False, shell=None, hgcommand=None,
                  slowtimeout=defaults['slowtimeout']):
         """Create a test from parameters.
 
@@ -491,6 +491,7 @@
         self._extraconfigopts = extraconfigopts or []
         self._py3kwarnings = py3kwarnings
         self._shell = _bytespath(shell)
+        self._hgcommand = hgcommand or b'hg'
 
         self._aborted = False
         self._daemonpids = []
@@ -989,6 +990,8 @@
 
         if self._debug:
             script.append(b'set -x\n')
+        if self._hgcommand != b'hg':
+            script.append(b'alias hg="%s"\n' % self._hgcommand)
         if os.getenv('MSYSTEM'):
             script.append(b'alias pwd="pwd -W"\n')
 
@@ -1817,6 +1820,7 @@
         self._pythondir = None
         self._coveragefile = None
         self._createdfiles = []
+        self._hgcommand = None
         self._hgpath = None
         self._portoffset = 0
         self._ports = {}
@@ -1925,6 +1929,7 @@
             whg = self.options.with_hg
             self._bindir = os.path.dirname(os.path.realpath(whg))
             assert isinstance(self._bindir, bytes)
+            self._hgcommand = os.path.basename(whg)
             self._tmpbindir = os.path.join(self._hgtmp, b'install', b'bin')
             os.makedirs(self._tmpbindir)
 
@@ -1937,6 +1942,7 @@
         else:
             self._installdir = os.path.join(self._hgtmp, b"install")
             self._bindir = os.path.join(self._installdir, b"bin")
+            self._hgcommand = b'hg'
             self._tmpbindir = self._bindir
             self._pythondir = os.path.join(self._installdir, b"lib", b"python")
 
@@ -2117,7 +2123,8 @@
                     startport=self._getport(count),
                     extraconfigopts=self.options.extra_config_opt,
                     py3kwarnings=self.options.py3k_warnings,
-                    shell=self.options.shell)
+                    shell=self.options.shell,
+                    hgcommand=self._hgcommand)
         t.should_reload = True
         return t