104 lines
3.5 KiB
Python
104 lines
3.5 KiB
Python
#
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# Copyright (C) 2017 The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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"""Generates a make function approximating cygpath.
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We don't just call cygpath (unless directed by NDK_USE_CYGPATH=1) because we
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have to call this very often and doing so would be very slow. By doing this in
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make, we can be much faster.
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"""
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from __future__ import print_function
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import posixpath
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import re
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import sys
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def get_mounts(mount_output: str) -> list[tuple[str, str]]:
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"""Parses the output of mount and returns a dict of mounts.
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Args:
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mount_output: The text output from mount(1).
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Returns:
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A list of tuples mapping cygwin paths to Windows paths.
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"""
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mount_regex = re.compile(r"^(\S+) on (\S+) .*$")
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# We use a list of tuples rather than a dict because we want to recurse on
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# the list later anyway.
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mounts: list[tuple[str, str]] = []
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for line in mount_output.splitlines():
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# Cygwin's mount doesn't use backslashes even in Windows paths, so no
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# need to replace here.
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match = mount_regex.search(line)
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if match is not None:
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win_path = match.group(1)
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cyg_path = match.group(2)
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if cyg_path == "/":
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# Since we're going to be using patsubst on these, we need to
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# make sure that the rule for / is applied last, otherwise
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# we'll replace all other cygwin paths with that one.
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mounts.insert(0, (cyg_path, win_path))
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elif cyg_path.startswith("/cygdrive/"):
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# We need both /cygdrive/c and /cygdrive/C to point to C:.
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letter = posixpath.basename(cyg_path)
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lower_path = posixpath.join("/cygdrive", letter.lower())
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upper_path = posixpath.join("/cygdrive", letter.upper())
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mounts.append((lower_path, win_path))
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mounts.append((upper_path, win_path))
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else:
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mounts.append((cyg_path, win_path))
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return mounts
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def make_cygpath_function(mounts: list[tuple[str, str]]) -> str:
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"""Creates a make function that can be used in place of cygpath.
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Args:
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mounts: A list of tuples decribing filesystem mounts.
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Returns:
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The body of a function implementing cygpath in make as a string.
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"""
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# We're building a bunch of nested patsubst calls. Once we've written each
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# of the calls, we pass the function input to the inner most call.
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if not mounts:
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return "$1"
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cyg_path, win_path = mounts[0]
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if not cyg_path.endswith("/"):
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cyg_path += "/"
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if not win_path.endswith("/"):
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win_path += "/"
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other_mounts = mounts[1:]
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return "$(patsubst {}%,{}%,\n{})".format(
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cyg_path, win_path, make_cygpath_function(other_mounts)
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)
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def main() -> None:
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# We're invoked from make and piped the output of `mount` so we can
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# determine what mappings to make.
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mount_output = sys.stdin.read()
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mounts = get_mounts(mount_output)
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print(make_cygpath_function(mounts))
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if __name__ == "__main__":
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main()
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