Git: Fix bad signature and index file corrupt error

Git: Fix bad signature and index file corrupt error

If your git index for some reason becomes invalid and you see this error running usual git commands like 

git
pull

, 

git status

, etc.:

error: bad signature
fatal: index file corrupt

Though it sounds bad, your changes are still there. Fix it by first removing the index file, then resetting the branch:

rm .git/index
git reset

You should be all good now. To be safe, make a backup of 

.git/index

before you delete it.