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[Emacs-diffs] /srv/bzr/emacs/trunk r107422: Document SELinux support fun
From: |
Chong Yidong |
Subject: |
[Emacs-diffs] /srv/bzr/emacs/trunk r107422: Document SELinux support functions in Lisp manual. |
Date: |
Sat, 25 Feb 2012 17:07:23 +0800 |
User-agent: |
Bazaar (2.3.1) |
------------------------------------------------------------
revno: 107422
committer: Chong Yidong <address@hidden>
branch nick: trunk
timestamp: Sat 2012-02-25 17:07:23 +0800
message:
Document SELinux support functions in Lisp manual.
* doc/lispref/backups.texi (Making Backups): Return value of backup-buffer is
changed.
* doc/lispref/files.texi (File Attributes): Document file-selinux-context.
(Changing Files): Link to it.
(Changing Files): Document set-file-selinux-context.
* fileio.c (Ffile_selinux_context, Fset_file_selinux_context):
Doc fix.
modified:
doc/lispref/ChangeLog
doc/lispref/backups.texi
doc/lispref/files.texi
src/ChangeLog
src/fileio.c
=== modified file 'doc/lispref/ChangeLog'
--- a/doc/lispref/ChangeLog 2012-02-25 04:03:43 +0000
+++ b/doc/lispref/ChangeLog 2012-02-25 09:07:23 +0000
@@ -1,5 +1,12 @@
2012-02-25 Chong Yidong <address@hidden>
+ * files.texi (File Attributes): Document file-selinux-context.
+ (Changing Files): Link to it.
+ (Changing Files): Document set-file-selinux-context.
+
+ * backups.texi (Making Backups): Return value of backup-buffer is
+ changed.
+
* searching.texi (Regexp Backslash): Add index entry (Bug#10869).
2012-02-24 Glenn Morris <address@hidden>
=== modified file 'doc/lispref/backups.texi'
--- a/doc/lispref/backups.texi 2012-02-04 22:04:12 +0000
+++ b/doc/lispref/backups.texi 2012-02-25 09:07:23 +0000
@@ -57,12 +57,13 @@
saving the buffer the first time.
If a backup was made by renaming, the return value is a cons cell of
-the form (@var{modes} . @var{backupname}), where @var{modes} are the
-mode bits of the original file, as returned by @code{file-modes}
-(@pxref{File Attributes,, Other Information about Files}), and
address@hidden is the name of the backup. In all other cases, that
-is, if a backup was made by copying or if no backup was made, this
-function returns @code{nil}.
+the form (@var{modes} @var{context} @var{backupname}), where
address@hidden are the mode bits of the original file, as returned by
address@hidden (@pxref{File Attributes,, Other Information about
+Files}), @var{context} is a list describing the original file's
+SELinux context (@pxref{File Attributes}), and @var{backupname} is the
+name of the backup. In all other cases, that is, if a backup was made
+by copying or if no backup was made, this function returns @code{nil}.
@end defun
@defvar buffer-backed-up
=== modified file 'doc/lispref/files.texi'
--- a/doc/lispref/files.texi 2012-02-21 13:24:48 +0000
+++ b/doc/lispref/files.texi 2012-02-25 09:07:23 +0000
@@ -1129,6 +1129,18 @@
@xref{Changing Files}, for functions that change file permissions,
such as @code{set-file-modes}.
+
address@hidden MS-DOS and file modes
address@hidden file modes and MS-DOS
address@hidden note:} On MS-DOS, there is no such thing as an
+``executable'' file mode bit. So @code{file-modes} considers a file
+executable if its name ends in one of the standard executable
+extensions, such as @file{.com}, @file{.bat}, @file{.exe}, and some
+others. Files that begin with the Unix-standard @samp{#!} signature,
+such as shell and Perl scripts, are also considered executable.
+Directories are also reported as executable, for compatibility with
+Unix. These conventions are also followed by @code{file-attributes},
+below.
@end defun
If the @var{filename} argument to the next two functions is a
@@ -1304,16 +1316,26 @@
@end table
@end defun
address@hidden MS-DOS and file modes
address@hidden file modes and MS-DOS
- On MS-DOS, there is no such thing as an ``executable'' file mode bit.
-So Emacs considers a file executable if its name ends in one of the
-standard executable extensions, such as @file{.com}, @file{.bat},
address@hidden, and some others. Files that begin with the Unix-standard
address@hidden signature, such as shell and Perl scripts, are also considered
-as executable files. This is reflected in the values returned by
address@hidden and @code{file-attributes}. Directories are also
-reported with executable bit set, for compatibility with Unix.
address@hidden SELinux context
+ SELinux is a Linux kernel feature which provides more sophisticated
+file access controls than ordinary ``Unix-style'' file permissions.
+If Emacs has been compiled with SELinux support on a system with
+SELinux enabled, you can use the function @code{file-selinux-context}
+to retrieve a file's SELinux security context. For the function
address@hidden, see @ref{Changing Files}.
+
address@hidden file-selinux-context filename
+This function returns the SELinux security context of the file
address@hidden This return value is a list of the form
address@hidden(@var{user} @var{role} @var{type} @var{range})}, whose elements
+are the context's user, role, type, and range respectively, as Lisp
+strings. See the SELinux documentation for details about what these
+actually mean.
+
+If the file does not exist or is inaccessible, or if the system does
+not support SELinux, or if Emacs was not compiled with SELinux
+support, then the return value is @code{(nil nil nil nil)}.
address@hidden defun
@node Locating Files
@subsection How to Locate Files in Standard Places
@@ -1528,15 +1550,9 @@
file. This works only on some operating systems, and only if you have
the correct permissions to do so.
address@hidden SELinux
-If the optional argument @var{preserve-selinux} is address@hidden, we
-attempt to copy the address@hidden@samp{Security-Enhanced Linux}
-is a kernel feature that allows for finer access controls to be set on
-files, and a system security policy to define who can access what.
-The functions @code{file-selinux-context} and @code{set-file-selinux-context}
-get and set, respectively, the SELinux properties of a file.}
-context of the file. For this to work, Emacs must have been built
-with libselinux support.
+If the optional argument @var{preserve-selinux} is address@hidden, and
+Emacs has been compiled with SELinux support, this function attempts
+to copy the file's SELinux context (@pxref{File Attributes}).
@end deffn
@deffn Command make-symbolic-link filename newname &optional ok-if-exists
@@ -1667,6 +1683,16 @@
(@pxref{Time of Day}).
@end defun
address@hidden set-file-selinux-context filename context
+This function sets the SELinux security context of the file
address@hidden to @var{context}. @xref{File Attributes}, for a brief
+description of SELinux contexts. The @var{context} argument should be
+a list @code{(@var{user} @var{role} @var{type} @var{range})}, like the
+return value of @code{file-selinux-context}. The function does
+nothing if SELinux is disabled, or if Emacs was compiled without
+SELinux support.
address@hidden defun
+
@node File Names
@section File Names
@cindex file names
=== modified file 'src/ChangeLog'
--- a/src/ChangeLog 2012-02-25 03:01:11 +0000
+++ b/src/ChangeLog 2012-02-25 09:07:23 +0000
@@ -1,5 +1,8 @@
2012-02-25 Chong Yidong <address@hidden>
+ * fileio.c (Ffile_selinux_context, Fset_file_selinux_context):
+ Doc fix.
+
* xselect.c (Fx_selection_exists_p): Doc fix.
(x_clipboard_manager_save_all): Print an informative message
before saving to clipboard manager.
=== modified file 'src/fileio.c'
--- a/src/fileio.c 2012-02-21 13:24:48 +0000
+++ b/src/fileio.c 2012-02-25 09:07:23 +0000
@@ -2798,9 +2798,13 @@
DEFUN ("file-selinux-context", Ffile_selinux_context,
Sfile_selinux_context, 1, 1, 0,
- doc: /* Return SELinux context of file named FILENAME,
-as a list ("user", "role", "type", "range"). Return (nil, nil, nil, nil)
-if file does not exist, is not accessible, or SELinux is disabled */)
+ doc: /* Return SELinux context of file named FILENAME.
+The return value is a list (USER ROLE TYPE RANGE), where the list
+elements are strings naming the user, role, type, and range of the
+file's SELinux security context.
+
+Return (nil nil nil nil) if the file is nonexistent or inaccessible,
+or if SELinux is disabled, or if Emacs lacks SELinux support. */)
(Lisp_Object filename)
{
Lisp_Object absname;
@@ -2853,9 +2857,12 @@
DEFUN ("set-file-selinux-context", Fset_file_selinux_context,
Sset_file_selinux_context, 2, 2, 0,
- doc: /* Set SELinux context of file named FILENAME to CONTEXT
-as a list ("user", "role", "type", "range"). Has no effect if SELinux
-is disabled. */)
+ doc: /* Set SELinux context of file named FILENAME to CONTEXT.
+CONTEXT should be a list (USER ROLE TYPE RANGE), where the list
+elements are strings naming the components of a SELinux context.
+
+This function does nothing if SELinux is disabled, or if Emacs was not
+compiled with SELinux support. */)
(Lisp_Object filename, Lisp_Object context)
{
Lisp_Object absname;
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