Make use of global variable _cwd to store the path cd(path) changes to

This is a workaround to python's os.getcwd() which always returns the real path, not the logical one
Due to this os.getcwd() would never return the path inside the symlunk
This commit also introduces getcwd() implementation that uses _cwd

Author: screamerbg

mbed/mbed.py

@@ -127,7 +127,7 @@
 
 # stores current working directory for recursive operations
 cwd_root = ""
-
+_cwd = os.getcwd()
 
 # Logging and output
 def log(msg):
@@ -175,7 +175,7 @@ class ProcessException(Exception):
 
 def popen(command, stdin=None, **kwargs):
     # print for debugging
-    info('Exec "'+' '.join(command)+'" in '+os.getcwd())
+    info('Exec "'+' '.join(command)+'" in '+getcwd())
     try:
         proc = subprocess.Popen(command, **kwargs)
     except OSError as e:
@@ -187,11 +187,11 @@ def popen(command, stdin=None, **kwargs):
             raise e
 
     if proc.wait() != 0:
-        raise ProcessException(proc.returncode, command[0], ' '.join(command), os.getcwd())
+        raise ProcessException(proc.returncode, command[0], ' '.join(command), getcwd())
 
 def pquery(command, stdin=None, **kwargs):
     if very_verbose:
-        info('Query "'+' '.join(command)+'" in '+os.getcwd())
+        info('Query "'+' '.join(command)+'" in '+getcwd())
     try:
         proc = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, **kwargs)
     except OSError as e:
@@ -208,7 +208,7 @@ def pquery(command, stdin=None, **kwargs):
         log(str(stdout).strip()+"\n")
 
     if proc.returncode != 0:
-        raise ProcessException(proc.returncode, command[0], ' '.join(command), os.getcwd())
+        raise ProcessException(proc.returncode, command[0], ' '.join(command), getcwd())
 
     return stdout
 
@@ -225,12 +225,19 @@ def remove_readonly(func, path, _):
 # Directory navigation
 @contextlib.contextmanager
 def cd(newdir):
-    prevdir = os.getcwd()
+    global _cwd
+    prevdir = getcwd()
     os.chdir(newdir)
+    _cwd = newdir
     try:
         yield
     finally:
         os.chdir(prevdir)
+        _cwd = prevdir
+
+def getcwd():
+    global _cwd
+    return _cwd
 
 def relpath(root, path):
     return path[len(root)+1:]
@@ -309,12 +316,12 @@ def unpack_rev(rev):
         rev_file = os.path.join('.'+Bld.name, '.rev-' + rev + '.zip')
         try:
             with zipfile.ZipFile(rev_file) as zf:
-                action("Unpacking library build \"%s\" in \"%s\"" % (rev, os.getcwd()))
+                action("Unpacking library build \"%s\" in \"%s\"" % (rev, getcwd()))
                 zf.extractall('.')
         except:
             if os.path.isfile(rev_file):
                 os.remove(rev_file)
-            raise Exception(128, "An error occurred while unpacking library archive \"%s\" in \"%s\"" % (rev_file, os.getcwd()))
+            raise Exception(128, "An error occurred while unpacking library archive \"%s\" in \"%s\"" % (rev_file, getcwd()))
 
     def checkout(rev, clean=False):
         url = Bld.geturl()
@@ -331,7 +338,7 @@ def checkout(rev, clean=False):
         if rev != Bld.getrev() or clean:
             Bld.cleanup()
 
-            info("Checkout \"%s\" in %s" % (rev, os.path.basename(os.getcwd())))
+            info("Checkout \"%s\" in %s" % (rev, os.path.basename(getcwd())))
             try:
                 Bld.unpack_rev(rev)
                 Bld.seturl(url+'/'+rev)
@@ -345,7 +352,7 @@ def untracked():
         return ""
 
     def seturl(url):
-        info("Setting url to \"%s\" in %s" % (url, os.getcwd()))
+        info("Setting url to \"%s\" in %s" % (url, getcwd()))
         if not os.path.exists('.'+Bld.name):
             os.mkdir('.'+Bld.name)
 
@@ -417,15 +424,15 @@ def publish(all_refs=None):
         popen([hg_cmd, 'push'] + (['--new-branch'] if all_refs else []) + (['-v'] if very_verbose else ([] if verbose else ['-q'])))
 
     def fetch():
-        info("Fetching revisions from remote repository to \"%s\"" % os.path.basename(os.getcwd()))
+        info("Fetching revisions from remote repository to \"%s\"" % os.path.basename(getcwd()))
         popen([hg_cmd, 'pull'] + (['-v'] if very_verbose else ([] if verbose else ['-q'])))
 
     def discard():
-        info("Discarding local changes in \"%s\"" % os.path.basename(os.getcwd()))
+        info("Discarding local changes in \"%s\"" % os.path.basename(getcwd()))
         popen([hg_cmd, 'update', '-C'] + (['-v'] if very_verbose else ([] if verbose else ['-q'])))
 
     def checkout(rev, clean=False, clean_files=False):
-        info("Checkout \"%s\" in %s" % (rev if rev else "latest", os.path.basename(os.getcwd())))
+        info("Checkout \"%s\" in %s" % (rev if rev else "latest", os.path.basename(getcwd())))
         if clean_files:
             files = pquery([hg_cmd, 'status', '--no-status', '-ui']).splitlines()
             for f in files:
@@ -457,7 +464,7 @@ def outgoing():
             return 0
 
     def seturl(url):
-        info("Setting url to \"%s\" in %s" % (url, os.getcwd()))
+        info("Setting url to \"%s\" in %s" % (url, getcwd()))
         hgrc = os.path.join('.hg', 'hgrc')
         tagpaths = '[paths]'
         remote = 'default'
@@ -540,7 +547,7 @@ def ignores():
             with open(Hg.ignore_file, 'w') as f:
                 f.write("syntax: glob\n"+'\n'.join(ignores)+'\n')
         except IOError:
-            error("Unable to write ignore file in \"%s\"" % os.path.join(os.getcwd(), Hg.ignore_file), 1)
+            error("Unable to write ignore file in \"%s\"" % os.path.join(getcwd(), Hg.ignore_file), 1)
 
     def ignore(dest):
         Hg.hgrc()
@@ -555,7 +562,7 @@ def ignore(dest):
                 with open(Hg.ignore_file, 'a') as f:
                     f.write(dest + '\n')
             except IOError:
-                error("Unable to write ignore file in \"%s\"" % os.path.join(os.getcwd(), Hg.ignore_file), 1)
+                error("Unable to write ignore file in \"%s\"" % os.path.join(getcwd(), Hg.ignore_file), 1)
 
     def unignore(dest):
         Hg.ignore_file = os.path.join('.hg', 'hgignore')
@@ -571,7 +578,7 @@ def unignore(dest):
                 with open(Hg.ignore_file, 'w') as f:
                     f.write('\n'.join(lines) + '\n')
             except IOError:
-                error("Unable to write ignore file in \"%s\"" % os.path.join(os.getcwd(), Hg.ignore_file), 1)
+                error("Unable to write ignore file in \"%s\"" % os.path.join(getcwd(), Hg.ignore_file), 1)
 
 # pylint: disable=no-self-argument, no-method-argument, no-member, no-self-use, unused-argument
 @scm('git')
@@ -634,30 +641,30 @@ def publish(all_refs=None):
             if remote and branch:
                 popen([git_cmd, 'push', remote, branch] + (['-v'] if very_verbose else ([] if verbose else ['-q'])))
             else:
-                err = "Unable to publish outgoing changes for \"%s\" in \"%s\".\n" % (os.path.basename(os.getcwd()), os.getcwd())
+                err = "Unable to publish outgoing changes for \"%s\" in \"%s\".\n" % (os.path.basename(getcwd()), getcwd())
                 if not remote:
                     error(err+"The local repository is not associated with a remote one.", 1)
                 if not branch:
                     error(err+"Working set is not on a branch.", 1)
 
     def fetch():
-        info("Fetching revisions from remote repository to \"%s\"" % os.path.basename(os.getcwd()))
+        info("Fetching revisions from remote repository to \"%s\"" % os.path.basename(getcwd()))
         popen([git_cmd, 'fetch', '--all', '--tags'] + (['-v'] if very_verbose else ([] if verbose else ['-q'])))
 
     def discard(clean_files=False):
-        info("Discarding local changes in \"%s\"" % os.path.basename(os.getcwd()))
+        info("Discarding local changes in \"%s\"" % os.path.basename(getcwd()))
         pquery([git_cmd, 'reset', 'HEAD'] + ([] if very_verbose else ['-q'])) # unmarks files for commit
         pquery([git_cmd, 'checkout', '.'] + ([] if very_verbose else ['-q'])) # undo  modified files
         pquery([git_cmd, 'clean', '-fd'] + (['-x'] if clean_files else []) + (['-q'] if very_verbose else ['-q'])) # cleans up untracked files and folders
 
     def merge(dest):
-        info("Merging \"%s\" with \"%s\"" % (os.path.basename(os.getcwd()), dest))
+        info("Merging \"%s\" with \"%s\"" % (os.path.basename(getcwd()), dest))
         popen([git_cmd, 'merge', dest] + (['-v'] if very_verbose else ([] if verbose else ['-q'])))
 
     def checkout(rev, clean=False):
         if not rev:
             return
-        info("Checkout \"%s\" in %s" % (rev, os.path.basename(os.getcwd())))
+        info("Checkout \"%s\" in %s" % (rev, os.path.basename(getcwd())))
         branch = None
         refs = Git.getrefs(rev)
         for ref in refs: # re-associate with a local or remote branch (rev is the same)
@@ -692,7 +699,7 @@ def update(rev=None, clean=False, clean_files=False, is_local=False):
                 except ProcessException:
                     pass
             else:
-                err = "Unable to update \"%s\" in \"%s\"." % (os.path.basename(os.getcwd()), os.getcwd())
+                err = "Unable to update \"%s\" in \"%s\"." % (os.path.basename(getcwd()), getcwd())
                 if not remote:
                     info(err+" The local repository is not associated with a remote one.")
                 if not branch:
@@ -753,7 +760,7 @@ def getremotes(rtype='fetch'):
         return result
 
     def seturl(url):
-        info("Setting url to \"%s\" in %s" % (url, os.getcwd()))
+        info("Setting url to \"%s\" in %s" % (url, getcwd()))
         return pquery([git_cmd, 'remote', 'set-url', 'origin', url]).strip()
 
     def geturl():
@@ -807,7 +814,7 @@ def ignores():
             with open(Git.ignore_file, 'w') as f:
                 f.write('\n'.join(ignores)+'\n')
         except IOError:
-            error("Unable to write ignore file in \"%s\"" % os.path.join(os.getcwd(), Git.ignore_file), 1)
+            error("Unable to write ignore file in \"%s\"" % os.path.join(getcwd(), Git.ignore_file), 1)
 
     def ignore(dest):
         try:
@@ -825,7 +832,7 @@ def ignore(dest):
                 with open(Git.ignore_file, 'a') as f:
                     f.write(dest.replace("\\", "/") + '\n')
             except IOError:
-                error("Unable to write ignore file in \"%s\"" % os.path.join(os.getcwd(), Git.ignore_file), 1)
+                error("Unable to write ignore file in \"%s\"" % os.path.join(getcwd(), Git.ignore_file), 1)
     def unignore(dest):
         try:
             with open(Git.ignore_file) as f:
@@ -843,7 +850,7 @@ def unignore(dest):
                 with open(Git.ignore_file, 'w') as f:
                     f.write('\n'.join(lines) + '\n')
             except IOError:
-                error("Unable to write ignore file in \"%s\"" % os.path.join(os.getcwd(), Git.ignore_file), 1)
+                error("Unable to write ignore file in \"%s\"" % os.path.join(getcwd(), Git.ignore_file), 1)
 
 # Repository object
 class Repo(object):
@@ -865,19 +872,19 @@ def fromurl(cls, url, path=None):
         m_bld_url = re.match(regex_build_url, url.strip().replace('\\', '/'))
         if m_local:
             repo.name = os.path.basename(path or m_local.group(1))
-            repo.path = os.path.abspath(path or os.path.join(os.getcwd(), m_local.group(1)))
+            repo.path = os.path.abspath(path or os.path.join(getcwd(), m_local.group(1)))
             repo.url = m_local.group(1)
             repo.rev = m_local.group(2)
             repo.is_local = True
         elif m_bld_url:
             repo.name = os.path.basename(path or m_bld_url.group(7))
-            repo.path = os.path.abspath(path or os.path.join(os.getcwd(), repo.name))
+            repo.path = os.path.abspath(path or os.path.join(getcwd(), repo.name))
             repo.url = m_bld_url.group(1)+'/builds'
             repo.rev = m_bld_url.group(8)
             repo.is_build = True
         elif m_repo_url:
             repo.name = os.path.basename(path or m_repo_url.group(2))
-            repo.path = os.path.abspath(path or os.path.join(os.getcwd(), repo.name))
+            repo.path = os.path.abspath(path or os.path.join(getcwd(), repo.name))
             repo.url = formaturl(m_repo_url.group(1))
             repo.rev = m_repo_url.group(3)
             if repo.rev and repo.rev != 'latest' and not re.match(r'^([a-fA-F0-9]{6,40})$', repo.rev):
@@ -911,11 +918,11 @@ def fromlib(cls, lib=None):
     def fromrepo(cls, path=None):
         repo = cls()
         if path is None:
-            path = Repo.findparent(os.getcwd())
+            path = Repo.findparent(getcwd())
             if path is None:
                 error(
                     "Could not find mbed program in current path \"%s\".\n"
-                    "You can fix this by calling \"mbed new .\" or \"mbed config root .\" in the root of your program." % os.getcwd())
+                    "You can fix this by calling \"mbed new .\" or \"mbed config root .\" in the root of your program." % getcwd())
 
         repo.path = os.path.abspath(path)
         repo.name = os.path.basename(repo.path)
@@ -944,7 +951,7 @@ def isrepo(cls, path=None):
 
     @classmethod
     def findparent(cls, path=None):
-        path = os.path.abspath(path or os.getcwd())
+        path = os.path.abspath(path or getcwd())
 
         while cd(path):
             if os.path.isfile(os.path.join(path, Cfg.file)) or Repo.isrepo(path):
@@ -959,7 +966,7 @@ def findparent(cls, path=None):
 
     @classmethod
     def pathtype(cls, path=None):
-        path = os.path.abspath(path or os.getcwd())
+        path = os.path.abspath(path or getcwd())
 
         depth = 0
         while cd(path):
@@ -1220,7 +1227,7 @@ class Program(object):
     build_dir = "BUILD"
 
     def __init__(self, path=None, print_warning=False):
-        path = os.path.abspath(path or os.getcwd())
+        path = os.path.abspath(path or getcwd())
         self.path = path
         self.is_cwd = True
 
@@ -1675,7 +1682,7 @@ def thunk(parsed_args):
 def new(name, scm='git', program=False, library=False, mbedlib=False, create_only=False, depth=None, protocol=None):
     global cwd_root
 
-    d_path = os.path.abspath(name or os.getcwd())
+    d_path = os.path.abspath(name or getcwd())
     p_path = os.path.dirname(d_path)
     if program and library:
         error("Cannot use both --program and --library options.", 1)
@@ -2179,10 +2186,10 @@ def compile_(toolchain=None, target=None, profile=False, compile_library=False,
     # Gather remaining arguments
     args = remainder
     # Find the root of the program
-    program = Program(os.getcwd(), True)
+    program = Program(getcwd(), True)
     program.check_requirements(True)
     # Remember the original path. this is needed for compiling only the libraries and tests for the current folder.
-    orig_path = os.getcwd()
+    orig_path = getcwd()
 
     with cd(program.path):
         tools_dir = os.path.abspath(program.get_tools())
@@ -2299,10 +2306,10 @@ def test_(toolchain=None, target=None, compile_list=False, run_list=False, compi
     # Gather remaining arguments
     args = remainder
     # Find the root of the program
-    program = Program(os.getcwd(), True)
+    program = Program(getcwd(), True)
     program.check_requirements(True)
     # Save original working directory
-    orig_path = os.getcwd()
+    orig_path = getcwd()
 
     target = program.get_target(target)
     tchain = program.get_toolchain(toolchain)
@@ -2394,10 +2401,10 @@ def export(ide=None, target=None, source=False, clean=False, supported=False, ap
     # Gather remaining arguments
     args = remainder
     # Find the root of the program
-    program = Program(os.getcwd(), True)
+    program = Program(getcwd(), True)
     program.check_requirements(True)
     # Remember the original path. this is needed for compiling only the libraries and tests for the current folder.
-    orig_path = os.getcwd()
+    orig_path = getcwd()
     # Change directories to the program root to use mbed OS tools
     with cd(program.path):
         tools_dir = program.get_tools()
@@ -2445,7 +2452,7 @@ def detect():
     # Gather remaining arguments
     args = remainder
     # Find the root of the program
-    program = Program(os.getcwd(), False)
+    program = Program(getcwd(), False)
     program.check_requirements(True)
     # Change directories to the program root to use mbed OS tools
     with cd(program.path):
@@ -2494,7 +2501,7 @@ def config_(var=None, value=None, global_cfg=False, unset=False, list_config=Fal
             log("No global configuration is set\n")
         log("\n")
 
-        p = Program(os.getcwd())
+        p = Program(getcwd())
         action("Local config (%s):" % p.path)
         if not p.is_cwd:
             p_vars = p.list_cfg().items()
@@ -2521,7 +2528,7 @@ def config_(var=None, value=None, global_cfg=False, unset=False, list_config=Fal
                 action(('%s' % value) if value else 'No global %s set' % (name))
         else:
             # Find the root of the program
-            program = Program(os.getcwd())
+            program = Program(getcwd())
             if program.is_cwd and not var == 'ROOT':
                 error(
                     "Could not find mbed program in current path \"%s\".\n"
@@ -2577,7 +2584,7 @@ def main():
     global verbose, very_verbose, remainder, cwd_root
 
     # Help messages adapt based on current dir
-    cwd_root = os.getcwd()
+    cwd_root = getcwd()
 
     if sys.version_info[0] != 2 or sys.version_info[1] < 7:
         error(
@@ -2599,7 +2606,7 @@ def main():
     try:
         very_verbose = pargs.very_verbose
         verbose = very_verbose or pargs.verbose
-        info('Working path \"%s\" (%s)' % (os.getcwd(), Repo.pathtype(cwd_root)))
+        info('Working path \"%s\" (%s)' % (getcwd(), Repo.pathtype(cwd_root)))
         status = pargs.command(pargs)
     except ProcessException as e:
         error(