bug#11490: vc-next-action overwrites changes in non-checked-out RCS file

[Jonathan Kamens <jik@kamens.us>]

[-- Attachment #1: Type: text/plain, Size: 696 bytes --]

Try it without making the file writable.

This happens, e.g., if a file is edited as root by a user using vim, 
which doesn't care whether it's writable or not, since it's root doing 
the editing, and then by a user using Emacs, which /does/ care because 
it detects VC and thus makes the file read-only in Emacs. The user's 
first impulse will be to type C-x v v, which will overwrite the previous 
editor's changes.

The problem goes away when vc-mistrust-permissions is set to true.

I would argue that C-x v v should always check the status of a file with 
vc-mistrust-permissions set to true (or the logical equivalent) before 
overwriting its contents and potentially losing data.

   jik


[-- Attachment #2: Type: text/html, Size: 975 bytes --]