Every time I copy files from an NTFS-formatted drive (one that was formatted from Windows) into macOS, their permissions are messed up. If they happen to be part of a Git repo, they’ll all show up as modified, with diffs looking like this:
$ git diff
diff --git a/.gitignore b/.gitignore
old mode 100644
new mode 100755
diff --git a/Gemfile b/Gemfile
old mode 100644
new mode 100755
diff --git a/Gemfile.lock b/Gemfile.lock
old mode 100644
new mode 100755
...
The quickest way I’ve found of fixing this is by using find with its -type and -exec flags, like this:
$ find . -type f -exec chmod 644 {} \;
This command will find all files under the current path (.) and execute the command chmod 644 <file> on each of them.
We can also fix directories with this similar command:
$ find . -type d -exec chmod 755 {} \;
This will find all directories in the current path (.) and execute the command chmod 755 <directory> on each of them.
Now our git diff should go back to normal. Phew!