I have already checked several similar links but nothing worked. Before i explain the issue, i was earlier getting following message while saving any file:

vim e509 Cannot create backup file (add ! to override)

While searching for solution, i came across several links which suggested creating .vimrc file. So i created one and entered the following contents in it:

set backup
set backupdir=~/.vim/backups

I also created the ~/.vim/backups directory. Also, there is no .viminfo file. I think i removed it while trying to fix things.

Few other details that might be of interest are:

-sh-4.2$ id
uid=497(git) gid=496(git) groups=496(git)
-sh-4.2$ ls -ld .vim*
drwxr-xr-x 3 git git 4096 Dec 28 21:59 .vim
-rw-r--r-- 1 git git   40 Dec 28 22:09 .vimrc
-sh-4.2$ ls -l .vim/
drwxr-xr-x 2 git git 4096 Dec 28 22:11 backups

-sh-4.2$ pwd
/var/opt/gitlab
-sh-4.2$ ls -ld /var/
drwxr-xr-x 20 root root 4096 Dec 20 22:31 /var/
-sh-4.2$ ls -ld /var/opt/
drwxr-xr-x 3 root root 4096 Oct 21 21:01 /var/opt/
-sh-4.2$ ls -ld /var/opt/gitlab/
drwxr-xr-x 15 root root 4096 Dec 28 22:08 /var/opt/gitlab/

Now with the above permissions in place (no write for any user in any of the parent dirs), whenever i switch to git user and try saving any file, i am now getting the following error:

E138: Can't write viminfo file /var/opt/gitlab/.viminfo!
Press ENTER or type command to continue

Is the above error expected or am i doing something wrong? GitLab application creates git user as part of the install process so i am not sure whether changing the permissions will be a good idea.

System Info:
[root@gitlab gitlab]# cat /etc/*release
NAME="Amazon Linux AMI"
VERSION="2015.09"
ID_LIKE="rhel fedora"