Git change default umask when update file

Question

I have a problem with Git. I searched for a solution in Google and in StackOverflow but nothing helps.

The problem is that every time git updates some file in the wo

Answer 1

I've just been hitting this problem when checking out a repo to a home directory mounted via NFS on Ubuntu 14.04 (Trusty) using the backported Xenial version 4.x linux Kernel. Git clone to a local directory was fine. Even more odd: A second Ubuntu 14.04 server did not exhibit the same problem on the same mounted directory.

After a lot of poking around I was able to see using strace that git called the open() system call to create each file with options O_CREAT,O_WRONLY and O_EXCL and a mode of 0666, but then the next syscal was an fstat() against the file and told me it was mode 0700 . In my case the problem only affected certain files in the repo. Despite 'git ls-index' showing mode 0644 for most files, some of them were being created correctly and others not; although it was always the same files which had wrong permissions on clone.

I noticed that there was a difference in Kernel version between the two systems and then discovered the following bug: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1654288

Upgrading the kernel to 4.4.0-98 (from 4.4.0-59) fixed this for me. I checked some hosts still using the version 3.x Linux Kernel and these did not have problem.