mkcert silently overwrites CSR file

[rajiv]

running mkcert 1.4.2.

when using the -csr flag, mkcert silently replaces the CSR file www.example.com.pem with a file of the same name www.example.com.pem that contains the signed certificate. instead of this destructive behaviour, mkcert could exit with an error instead of overwriting.

1. create a CSR file in an external system and place in the current directory
2. name the CSR file www.example.com.pem
3. run mkcert -csr www.example.com.pem
4. the file www.example.com.pem is replaced with the signed cert, and the CSR is destroyed

[FiloSottile]

Ah, yeah we should not do that. I'll just add an error for trying to write to an existing file.