uts: make default hostname configurable, rather than always using "(none)"

The "hostname" tool falls back to setting the hostname to "localhost" if
/etc/hostname does not exist.  Distribution init scripts have the same
fallback.  However, if userspace never calls sethostname, such as when
booting with init=/bin/sh, or otherwise booting a minimal system without
the usual init scripts, the default hostname of "(none)" remains,
unhelpfully appearing in various places such as prompts ("root@(none):~#")
and logs.  Furthermore, "(none)" doesn't typically resolve to anything
useful.

Make the default hostname configurable.  This removes the need for the
standard fallback, provides a useful default for systems that never call
sethostname, and makes minimal systems that much more useful with less
configuration.  Distributions could choose to use "localhost" here to
avoid the fallback, while embedded systems may wish to use a specific
target hostname.

Signed-off-by: Josh Triplett <josh@joshtriplett.org>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Acked-by: David Miller <davem@davemloft.net>
Cc: Serge Hallyn <serue@us.ibm.com>
Cc: Kel Modderman <kel@otaku42.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/uts.h b/include/linux/uts.h
index 73eb1ed36ec4cdb19b92a33b146b632ac9378f38..6ddbd86377dec3375549f2f02ef5c7c47fa9bfb3 100644 (file)
--- a/include/linux/uts.h
+++ b/include/linux/uts.h
@@ -9,7 +9,7 @@
 #endif
 
 #ifndef UTS_NODENAME
-#define UTS_NODENAME "(none)"  /* set by sethostname() */
+#define UTS_NODENAME CONFIG_DEFAULT_HOSTNAME /* set by sethostname() */
 #endif
 
 #ifndef UTS_DOMAINNAME

diff --git a/init/Kconfig b/init/Kconfig
index ebafac4231eeff15883809419e6df0c211b90e1a..e0a22e42d39a08b4745eac250389dd4bd1799ac7 100644 (file)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -204,6 +204,15 @@ config KERNEL_LZO
 
 endchoice
 
+config DEFAULT_HOSTNAME
+       string "Default hostname"
+       default "(none)"
+       help
+         This option determines the default system hostname before userspace
+         calls sethostname(2). The kernel traditionally uses "(none)" here,
+         but you may wish to use a different default here to make a minimal
+         system more usable with less configuration.
+
 config SWAP
        bool "Support for paging of anonymous memory (swap)"
        depends on MMU && BLOCK