diff:groovy: can't clone checkstyle repo in some directories on Windows

[rnveach]

Identified at #839 (comment) ,

When running diff.groovy with the checkstyle on my local, I got the following error:

Cloning into 'repositories\checkstyle'...
error: unable to create file src/it/resources/org/checkstyle/suppressionxpathfilter/unnecessarysemicolonafteroutertypedeclaration/SuppressionXpathRegressionUnnecessarySemicolonAfterOuterTypeDeclaration.java: Filename too long
error: unable to create file src/it/resources/org/checkstyle/suppressionxpathfilter/unnecessarysemicolonafteroutertypedeclaration/SuppressionXpathRegressionUnnecessarySemicolonAfterOuterTypeDeclarationInnerTypes.java: Filename too long
error: unable to create file src/it/resources/org/checkstyle/suppressionxpathfilter/unnecessarysemicolonaftertypememberdeclaration/SuppressionXpathRegressionUnnecessarySemicolonAfterTypeMemberDeclaration.java: Filename too long
error: unable to create file src/it/resources/org/checkstyle/suppressionxpathfilter/unnecessarysemicolonaftertypememberdeclaration/SuppressionXpathRegressionUnnecessarySemicolonAfterTypeMemberDeclarationTokens.java: Filename too long
error: unable to create file src/test/resources-noncompilable/com/puppycrawl/tools/checkstyle/checks/coding/unnecessarysemicolonafteroutertypedeclaration/InputUnnecessarySemicolonAfterOuterTypeDeclarationRecords.java: Filename too long
error: unable to create file src/test/resources-noncompilable/com/puppycrawl/tools/checkstyle/checks/coding/unnecessarysemicolonaftertypememberdeclaration/InputUnnecessarySemicolonAfterTypeMemberDeclarationRecords.java: Filename too long
error: unable to create file src/test/resources-noncompilable/com/puppycrawl/tools/checkstyle/checks/coding/variabledeclarationusagedistance/InputVariableDeclarationUsageDistanceCheckSwitchExpressions.java: Filename too long
error: unable to create file src/test/resources-noncompilable/com/puppycrawl/tools/checkstyle/checks/coding/variabledeclarationusagedistance/InputVariableDeclarationUsageDistanceCheckSwitchExpressions2.java: Filename too long
error: unable to create file src/test/resources-noncompilable/com/puppycrawl/tools/checkstyle/checks/naming/abbreviationaswordinname/InputAbbreviationAsWordInNameCheckEnhancedInstanceofAllowXmlLength1.java: Filename too long
error: unable to create file src/test/resources-noncompilable/com/puppycrawl/tools/checkstyle/checks/whitespace/nowhitespacebeforecasedefaultcolon/InputNoWhitespaceBeforeCaseDefaultColonEnumAndStrings.java: Filename too long
error: unable to create file src/test/resources/com/puppycrawl/tools/checkstyle/checks/coding/unnecessarysemicolonaftertypememberdeclaration/InputUnnecessarySemicolonAfterTypeMemberDeclarationNullAst.java: Filename too long
.....
fatal: unable to checkout working tree
warning: Clone succeeded, but checkout failed.
You can inspect what was checked out with 'git status'
and retry with 'git restore --source=HEAD :/'
....
fatal: destination path 'repositories\checkstyle' already exists and is not an empty directory.
fatal: destination path 'repositories\checkstyle' already exists and is not an empty directory.
fatal: destination path 'repositories\checkstyle' already exists and is not an empty directory.
fatal: destination path 'repositories\checkstyle' already exists and is not an empty directory.
Caught: groovy.lang.GroovyRuntimeException: Error: !

This shows I can't do this in a nested directory (M:\checkstyleWorkspaceEclipse\contribution\checkstyle-tester) of 61 characters.

I tested this and I can't clone checkstyle into a path of 71 characters or more.

\contribution\checkstyle-tester\repositories\checkstyle is 56 characters, which doesn't include the drive (2 characters), leaving me 13 characters to put the contribution directory somewhere if I choose.

We should allow users to override the repository directory. It creates issues and a lag to put it into the path of git even with the gitignore when I was working with this on linux.