diff options
Diffstat (limited to 'kconfiglib.py')
| -rw-r--r-- | kconfiglib.py | 206 |
1 files changed, 115 insertions, 91 deletions
diff --git a/kconfiglib.py b/kconfiglib.py index 4ad35d6..614a46f 100644 --- a/kconfiglib.py +++ b/kconfiglib.py @@ -342,24 +342,33 @@ Using 'rsource' it can be rewritten as: If absolute path is given to 'rsource' then it follows behavior of 'source'. -Globbed sourcing with 'gsource' and 'grsource' ----------------------------------------------- +Globbed sourcing +---------------- -The 'gsource' statement works like 'source', but takes a glob pattern and -sources all matching Kconfig files. For example, the following statement might -source 'sub1/foofoofoo' and 'sub2/foobarfoo': +'source' and 'rsource' accept glob patterns, sourcing all matching Kconfig +files. They require at least one matching file, throwing a KconfigError +otherwise. - gsource "sub[12]/foo*foo" +For example, the following statement might source sub1/foofoofoo and +sub2/foobarfoo: + + source "sub[12]/foo*foo" The glob patterns accepted are the same as for the standard glob.glob() function. -If no file matches the pattern, gsource is a no-op, and hence doubles as an -include-if-exists function when given a plain filename (similar to '-include' -in 'make'). It might help to think of the 'g' as "generalized" in that case. +Two additional statements are provided for cases where it's acceptable for a +pattern to match no files: 'osource' and 'orsource' (the o is for "optional"). + +For example, the following statements will be no-ops if neither "foo" nor any +files matching "bar*" exist: + + osource "foo" + osource "bar*" -'grsource' is the 'rsource' version of 'gsource' and globs relative to the -directory of the current Kconfig file. +'orsource' does a relative optional source. + +'source' and 'osource' are analogous to 'include' and '-include' in Make. Feedback @@ -499,10 +508,15 @@ class Kconfig(object): srctree: The value of the $srctree environment variable when the configuration was - loaded, or None if $srctree wasn't set. Kconfig and .config files are - looked up relative to $srctree if they are not found in the base path - (unless absolute paths are used). This is used to support out-of-tree - builds. The C tools use this environment variable in the same way. + loaded, or the empty string if $srctree wasn't set. This gives nice + behavior with os.path.join(), which treats "" as the current directory, + without adding "./". + + Kconfig files are looked up relative to $srctree (unless absolute paths + are used), and .config files are looked up relative to $srctree if they + are not found in the current directory. This is used to support + out-of-tree builds. The C tools use this environment variable in the same + way. Changing $srctree after creating the Kconfig instance has no effect. Only the value when the configuration is loaded matters. This avoids surprises @@ -572,7 +586,7 @@ class Kconfig(object): as .config files (which store configuration symbol values). filename (default: "Kconfig"): - The base Kconfig file. For the Linux kernel, you'll want "Kconfig" + The Kconfig file to load. For the Linux kernel, you'll want "Kconfig" from the top-level directory, as environment variables will make sure the right Kconfig is included from there (arch/$SRCARCH/Kconfig as of writing). @@ -581,8 +595,15 @@ class Kconfig(object): the base base Kconfig file will be in sys.argv[1]. It's currently always "Kconfig" in practice. - The $srctree environment variable is used to look up Kconfig files if - set. See the class documentation. + The $srctree environment variable is used to look up Kconfig files + referenced in Kconfig files if set. See the class documentation. + + Note: '(o)source' statements in Kconfig files always work relative to + $srctree (or the current directory if $srctree is unset), even if + 'filename' is a path with directories. This allows a subset of + Kconfig files to be loaded without breaking references to other + Kconfig files, e.g. by doing Kconfig("./sub/Kconfig"). sub/Kconfig + might expect to be sourced by ./Kconfig. warn (default: True): True if warnings related to this configuration should be generated. @@ -617,7 +638,7 @@ class Kconfig(object): Related PEP: https://www.python.org/dev/peps/pep-0538/ """ - self.srctree = os.environ.get("srctree") + self.srctree = os.environ.get("srctree") or "" self.config_prefix = os.environ.get("CONFIG_", "CONFIG_") # Regular expressions for parsing .config files, with the match() @@ -700,7 +721,7 @@ class Kconfig(object): self.top_node.prompt = ("Main menu", self.y) self.top_node.parent = None self.top_node.dep = self.y - self.top_node.filename = filename + self.top_node.filename = os.path.relpath(filename, self.srctree) self.top_node.linenr = 1 # Parse the Kconfig files @@ -714,11 +735,11 @@ class Kconfig(object): self._filestack = [] # The current parsing location - self._filename = filename + self._filename = os.path.relpath(filename, self.srctree) self._linenr = 0 # Open the top-level Kconfig file - self._file = self._open(filename) + self._file = self._open_enc(filename, _UNIVERSAL_NEWLINES_MODE) try: # Parse everything @@ -778,7 +799,7 @@ class Kconfig(object): for filename, cond in self.defconfig_list.defaults: if expr_value(cond): try: - with self._open(filename.str_value) as f: + with self._open_config(filename.str_value) as f: return f.name except IOError: continue @@ -819,7 +840,7 @@ class Kconfig(object): self._warn_for_no_prompt = True def _load_config(self, filename, replace): - with self._open(filename) as f: + with self._open_config(filename) as f: if replace: # If we're replacing the configuration, keep track of which # symbols and choices got set so that we can unset the rest @@ -1428,7 +1449,7 @@ class Kconfig(object): return "<{}>".format(", ".join(( "configuration with {} symbols".format(len(self.syms)), 'main menu prompt "{}"'.format(self.mainmenu_text), - "srctree not set" if self.srctree is None else + "srctree is current directory" if not self.srctree else 'srctree "{}"'.format(self.srctree), 'config symbol prefix "{}"'.format(self.config_prefix), "warnings " + @@ -1450,33 +1471,30 @@ class Kconfig(object): # File reading # - def _open(self, filename): - # First tries to open 'filename', then '$srctree/filename' if $srctree - # was set when the configuration was loaded + def _open_config(self, filename): + # Opens a .config file. First tries to open 'filename', then + # '$srctree/filename' if $srctree was set when the configuration was + # loaded. try: return self._open_enc(filename, _UNIVERSAL_NEWLINES_MODE) except IOError as e: - if not os.path.isabs(filename) and self.srctree is not None: - filename = os.path.join(self.srctree, filename) - try: - return self._open_enc(filename, _UNIVERSAL_NEWLINES_MODE) - except IOError as e2: - # This is needed for Python 3, because e2 is deleted after - # the try block: - # - # https://docs.python.org/3/reference/compound_stmts.html#the-try-statement - e = e2 - - raise IOError(textwrap.fill( - "Could not open '{}' ({}: {}). Perhaps the $srctree " - "environment variable (which was {}) is set incorrectly. Note " - "that the current value of $srctree is saved when the Kconfig " - "instance is created (for consistency and to cleanly " - "separate instances)." - .format(filename, errno.errorcode[e.errno], e.strerror, - "unset" if self.srctree is None else - '"{}"'.format(self.srctree)), + # This will try opening the same file twice if $srctree is unset, + # but it's not a big deal + try: + return self._open_enc(os.path.join(self.srctree, filename), + _UNIVERSAL_NEWLINES_MODE) + except IOError as e2: + # This is needed for Python 3, because e2 is deleted after + # the try block: + # + # https://docs.python.org/3/reference/compound_stmts.html#the-try-statement + e = e2 + + raise IOError("\n" + textwrap.fill( + "Could not open '{}' ({}: {}){}".format( + filename, errno.errorcode[e.errno], e.strerror, + self._srctree_hint()), 80)) def _enter_file(self, filename): @@ -1497,23 +1515,23 @@ class Kconfig(object): for name, linenr, _ in reversed(self._filestack)))) + # Open 'filename' relative to $srctree + # + # Note: We already know that the file exists + + full_filename = os.path.join(self.srctree, filename) try: - self._file = self._open(filename) + self._file = self._open_enc( + full_filename, _UNIVERSAL_NEWLINES_MODE) except IOError as e: - # Extend the error message a bit in this case - raise IOError(textwrap.fill( - "{}:{}: {} Also note that Kconfiglib expands references to " - "environment variables directly, " - "meaning you do not need \"bounce\" symbols with " - "'option env=\"FOO\"'. For compatibility with the C tools, " - "name the bounce symbols the same as the environment variable " - "they reference (like the Linux kernel does)." - .format(self._filename, self._linenr, e), - 80)) + raise IOError("{}:{}: Could not open '{}' ({}: {})".format( + self._filename, self._linenr, full_filename, + errno.errorcode[e.errno], e.strerror)) self._filename = filename self._linenr = 0 + def _leave_file(self): # Returns from a Kconfig file to the file that sourced it @@ -2158,40 +2176,34 @@ class Kconfig(object): # Tricky Python semantics: This assign prev.next before prev prev.next = prev = node - elif t0 == _T_SOURCE: - self._enter_file(self._expect_str_and_eol()) - prev = self._parse_block(None, parent, prev) - self._leave_file() + elif t0 in (_T_SOURCE, _T_RSOURCE, _T_OSOURCE, _T_ORSOURCE): + pattern = self._expect_str_and_eol() - elif t0 == _T_RSOURCE: - self._enter_file(os.path.join( - os.path.dirname(self._filename), - self._expect_str_and_eol() - )) - prev = self._parse_block(None, parent, prev) - self._leave_file() + # Check if the pattern is absolute and avoid stripping srctree + # from it below in that case. We must do the check before + # join()'ing, as srctree might be an absolute path. + isabs = os.path.isabs(pattern) - elif t0 in (_T_GSOURCE, _T_GRSOURCE): - pattern = self._expect_str_and_eol() - if t0 == _T_GRSOURCE: - # Relative gsource + if t0 in (_T_RSOURCE, _T_ORSOURCE): + # Relative source pattern = os.path.join(os.path.dirname(self._filename), pattern) - if self.srctree is None: - strip_srctree = False - else: - # $srctree set and pattern not absolute? - strip_srctree = not os.path.isabs(pattern) - - # If $srctree is set, glob relative to it - pattern = os.path.join(self.srctree, pattern) - # Sort the glob results to ensure a consistent ordering of # Kconfig symbols, which indirectly ensures a consistent # ordering in e.g. .config files - for filename in sorted(glob.iglob(pattern)): - if strip_srctree: + filenames = \ + sorted(glob.iglob(os.path.join(self.srctree, pattern))) + + if not filenames and t0 in (_T_SOURCE, _T_RSOURCE): + raise KconfigError("\n" + textwrap.fill( + "{}:{}: '{}' does not exist{}".format( + self._filename, self._linenr, pattern, + self._srctree_hint()), + 80)) + + for filename in filenames: + if not isabs: # Strip the $srctree prefix from the filename and let # the normal $srctree logic find the file. This makes # the globbed filenames appear without a $srctree @@ -2965,6 +2977,16 @@ class Kconfig(object): if self._warn_for_redun_assign: self._warn(msg, filename, linenr) + def _srctree_hint(self): + # Hint printed when Kconfig files can't be found or .config files can't + # be opened + + return ". Perhaps the $srctree environment variable (set to '{}') " \ + "is set incorrectly. Note that the current value of $srctree " \ + "is saved when the Kconfig instance is created (for " \ + "consistency and to cleanly separate instances)." \ + .format(self.srctree if self.srctree else "unset or blank") + class Symbol(object): """ Represents a configuration symbol: @@ -5593,8 +5615,6 @@ _IS_PY2 = sys.version_info[0] < 3 _T_EQUAL, _T_GREATER, _T_GREATER_EQUAL, - _T_GRSOURCE, - _T_GSOURCE, _T_HELP, _T_HEX, _T_IF, @@ -5612,6 +5632,8 @@ _IS_PY2 = sys.version_info[0] < 3 _T_OPTION, _T_OPTIONAL, _T_OR, + _T_ORSOURCE, + _T_OSOURCE, _T_PROMPT, _T_RANGE, _T_RSOURCE, @@ -5656,8 +5678,8 @@ _get_keyword = { "endif": _T_ENDIF, "endmenu": _T_ENDMENU, "env": _T_ENV, - "grsource": _T_GRSOURCE, - "gsource": _T_GSOURCE, + "grsource": _T_ORSOURCE, # Backwards compatibility + "gsource": _T_OSOURCE, # Backwards compatibility "help": _T_HELP, "hex": _T_HEX, "if": _T_IF, @@ -5670,6 +5692,8 @@ _get_keyword = { "on": _T_ON, "option": _T_OPTION, "optional": _T_OPTIONAL, + "orsource": _T_ORSOURCE, + "osource": _T_OSOURCE, "prompt": _T_PROMPT, "range": _T_RANGE, "rsource": _T_RSOURCE, @@ -5691,12 +5715,12 @@ _STRING_LEX = frozenset(( _T_BOOL, _T_CHOICE, _T_COMMENT, - _T_GRSOURCE, - _T_GSOURCE, _T_HEX, _T_INT, _T_MAINMENU, _T_MENU, + _T_ORSOURCE, + _T_OSOURCE, _T_PROMPT, _T_RSOURCE, _T_SOURCE, |