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WINDOWS_BUILD: Fixed race condition which can occur during a parallel build creating the .git-commit-id.h file

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Also, make a best effort attempt to populate the .git-commit-id file when installing the git-hooks on a newly cloned repository
This commit is contained in:
Mark Pizzolato 2014-09-19 10:46:15 -07:00
parent 9bfc87f2dc
commit 7154ca1fe1
1 changed files with 23 additions and 2 deletions
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23
Visual Studio Projects/Pre-Build-Event.cmd
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@ -22,7 +22,9 @@ rem are also performed. These include:
rem - confirming that if the current source is a clone of the simh
rem git repository, then then git hooks which manage making the
rem git commit hash available during builds are properly installed
rem in the repository hooks directory.
rem in the repository hooks directory. When the githooks are installed
rem the current commit id is generated if git.exe is available in the
rem current path.
rem - performing the activities which make the git repository commit id
rem available in an include file during compiles.
rem
@ -93,9 +95,20 @@ echo ** Installing git hooks in newly cloned repository **
echo *****************************************************
echo *****************************************************
copy git-hooks\post* ..\.git\hooks\
call :WhereInPath git.exe > NUL 2>&1
if %ERRORLEVEL% neq 0 goto _done_hooks
pushd ..
git log -1 "--pretty=%%H" >.git-commit-id
popd
:_done_hooks
:_SetId
rem
rem A race condition exists while creating the .git-commit-id.h file.
rem This race can happen during a parallel build, especially at the
rem beginning of a build where 2 projects can start execution a
rem almost the same time.
rem
SET GIT_COMMIT_ID=
if not exist ..\.git-commit-id goto _NoId
for /F %%i in (..\.git-commit-id) do SET GIT_COMMIT_ID=%%i
@ -104,6 +117,14 @@ SET OLD_GIT_COMMIT_ID=
if not exist .git-commit-id.h echo.>.git-commit-id.h
for /F "tokens=3" %%i in (.git-commit-id.h) do SET OLD_GIT_COMMIT_ID=%%i
if "%GIT_COMMIT_ID%" equ "%OLD_GIT_COMMIT_ID%" goto _IdGood
echo Generating updated .git-commit-id.h containing id %GIT_COMMIT_ID%
echo #define SIM_GIT_COMMIT_ID %GIT_COMMIT_ID% >.git-commit-id.h
if errorlevel 1 echo Retrying...
if errorlevel 1 goto _SetId
:_IdGood
:_done_id
goto :EOF
:WhereInPath
if "%~$PATH:1" NEQ "" exit /B 0
exit /B 1