Sometimes you need to check an executable into your Git repository and - even though Windows doesn't really have a concept of an "executable bit" - you might need to set it executable for the other platforms.
For example, a handful of my native code projects use the very clever clar project for unit testing. Clar uses a Python script to introspect your unit tests for the actual test functions and generate the harness. It's handy if this generator is executable on Unix boxes and - thankfully - Git will let you set it executable even on a Windows box.
Once you've staged your file, you can set it executable with the
git-update-index --chmod=+x command. For example:
C:\Repo> git add generate.py C:\Repo> git update-index --chmod=+x
And now you can ensure that the file is executable by inspecting the index:
C:\Repo> git ls-files --stage 100755 587efb519c0ab60692e8d4c19f3471e0dbbecd3d 0 generate.py
If you're familiar with Unix permissions, then you'll note that first
column looks like a Unix permission. Indeed, coming from a nice Unix
heritage, Git uses the mode
100644 to represent a non-executable file
100755 to represent an executable file.1
Now when you commit this change and check it out on a Unix system,
generate.py will be set executable!
Note, however, that this only looks a lot like a Unix
permission. Regardless of the file's actual permission, Git only
100644 for regular files and
100755 for executable files.
Effectively, this only stores whether a file is executable or not. ↩