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47 lines
2.1 KiB
Batchfile
47 lines
2.1 KiB
Batchfile
@echo off
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:: Copyright 2017 The Chromium Authors. All rights reserved.
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:: Use of this source code is governed by a BSD-style license that can be
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:: found in the LICENSE file.
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setlocal
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set PYTHON_BAT_RUNNER=1
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::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
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::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
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::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
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::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
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::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
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:: This file is automatically generated by "bootstrap\win\win_tools.py", and
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:: should not be modified.
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::
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:: The previous "::" block acts as a nop-sled. Each time a batch file executes
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:: a command, it reloads itself and seeks to its previous execution offset to
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:: begin execution. Updating this batch file is, therefore, risky, since any
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:: running Python instance that is using the old batch file will reload the new
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:: batch file once the Python command terminates and resume at some unknown
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:: offset.
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::
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:: With the sled in place, a previous instance will resume mid-label. We are
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:: assuming that the offset of the Python invocation is greater than the
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:: PYTHON_BAT_RUNNER set command, which is the case since the old instance has
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:: a large PATH set block before the Python execution. Old instances will hit
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:: the next block of code without PYTHON_BAT_RUNNER set. New instances will have
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:: it set.
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::
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:: We remedy this in the future by having the batch file load its core paths
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:: from an external file with for/set, removing the need to modify "python.bat"
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:: during upgrade.
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::
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:: After all of the old batch files are believed to be replaced, we can remove
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:: the PYTHON_BAT_RUNNER block and the sled. For this update, old instances
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:: will resume past the end of the file and terminate.
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if not "%PYTHON_BAT_RUNNER%" == "1" goto :END
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for /f %%i in (%~dp0python_bin_reldir.txt) do set PYTHON_BIN_RELDIR=%%i
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set PATH=%~dp0%PYTHON_BIN_RELDIR%;%~dp0%PYTHON_BIN_RELDIR%\Scripts;%PATH%
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"%~dp0%PYTHON_BIN_RELDIR%\python.exe" %*
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:END
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