From 3c8b8db047072bf682ff6315599b6bae66efa043 Mon Sep 17 00:00:00 2001 From: Eli Zaretskii Date: Tue, 22 Aug 2000 10:33:38 +0000 Subject: [PATCH] Document backup-by-copying-when-privileged-mismatch. --- man/files.texi | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/man/files.texi b/man/files.texi index 23d88aa4a0c..f0f64597c61 100644 --- a/man/files.texi +++ b/man/files.texi @@ -606,7 +606,10 @@ locally (@pxref{File Variables}). @vindex backup-by-copying @vindex backup-by-copying-when-linked @vindex backup-by-copying-when-mismatch - The choice of renaming or copying is controlled by three variables. +@vindex backup-by-copying-when-privileged-mismatch +@cindex file ownership, and backup +@cindex backup, and user's uid + The choice of renaming or copying is controlled by four variables. Renaming is the default choice. If the variable @code{backup-by-copying} is non-@code{nil}, copying is used. Otherwise, if the variable @code{backup-by-copying-when-linked} is non-@code{nil}, @@ -615,7 +618,12 @@ may still be used when the file being edited has only one name. If the variable @code{backup-by-copying-when-mismatch} is non-@code{nil}, then copying is used if renaming would cause the file's owner or group to change. @code{backup-by-copying-when-mismatch} is @code{t} by default -if you start Emacs as the superuser. +if you start Emacs as the superuser. The fourth variable, +@code{backup-by-copying-when-privileged-mismatch}, gives the highest +numeric user id for which @code{backup-by-copying-when-mismatch} will be +forced on. This is useful when low-numbered uid's are assigned to +special system users, such as @code{root}, @code{bin}, @code{daemon}, +etc., which must maintain ownership of files. When a file is managed with a version control system (@pxref{Version Control}), Emacs does not normally make backups in the usual way for -- 2.39.2