Tramp advises some VC functions. It is bad for one package in Emacs
to advise functions in another.
In one of those cases, VC wants to find out if a file is locked by the
calling user. To do this, VC invokes a command to print the name of
the user who locked the file, and then compares that name with
user-login-name.
For remote files, the comparison should not be with user-login-name,
it should instead be with the user logged into the remote host in
question.
Suggestions for solving this:
(1) New file operation file-mine-p, returns true if the file is owned
by the "calling user". For non-special files, the calling user is
the user who invoked Emacs. For Tramp files, the calling user is
the user logged into the remote host.
(2) New file operation file-calling-user, returns the calling user, as
defined in (1).
(3) Augment the return value of file-remote-p to indicate the calling
user. The return value could be augmented to also indicate the
remote host, if the file is remote.
What do people think?
Kai
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