Tells Git if the executable bit of files in the working tree
is to be honored.
Some filesystems lose the executable bit when a file that is
marked as executable is checked out, or checks out a
non-executable file with executable bit on. git-clone(1)
or git-init(1) probe the filesystem to see if it handles the
executable bit correctly and this variable is automatically
set as necessary.
A repository, however, may be on a filesystem that handles
the filemode correctly, and this variable is set to true when
created, but later may be made accessible from another
environment that loses the filemode (e.g. exporting ext4
via CIFS mount, visiting a Cygwin created repository with Git
for Windows or Eclipse). In such a case it may be necessary
to set this variable to false. See git-update-index(1).
The default is true (when core.filemode is not specified
in the config file).