Re: git-pull sets write bit, git-push does not

> git-pull sets write bit, git-push does not
>
> Hello,
>
> Background: I am using Git locally with ClearCase upstream. I
> initialized a Git repository on top of a ClearCase snapshot view,
> while my work branches are in a clone. As ClearCase is particular
> about the write bit, I have come to depend on an undocumented feature
> of Git. Namely, that git-push preserves read only permissions, while
> git-pull sets modified files writable.
>
> Can git-push be relied upon to preserve the write bit (readonly)? Why
> is git-pull different? Is it a side effect of the plumbing?

>
> Thanks,
> Alex
>
> http://genaud.net/2008/08/clearcase-globally-git-locally/
>
>
> Simplified case:
>
> echo --
> echo create a repo r1 with files A and B committed
> echo --
> mkdir r1
> cd r1
> echo A > A
> echo B > B
> git init
> git add .
> git commit -m init
>
> echo --
> echo create an identical repo r2 whose files are readonly
> echo --
> cp -r ../r1 ../r2
> chmod u-w ../r2/[AB]
>
> echo --
> echo push a modification of A from r1 to r2
> echo --
> echo AA > A
> git commit -a -m modA
> git push ../r2
>
> echo --
> echo pull a modification of B from r1 to r2
> echo --
> echo BB > B
> git commit -a -m modB
> cd ../r2
> git pull ../r1
>
> echo --
> echo notice that pushed A remains readonly
> echo while pulled B has become writable
> echo --
> ls -l
>