[PATCH] kbuild: automatically append a short string to the version based upon the...

If CONFIG_AUTO_LOCALVERSION is set, the user is using a git-based tree, and the
current HEAD is not referred to by any tags in .git/refs/tags/, append -g and
the first 8 characters of the commit to the version string.  This makes it
easier to use git-bisect, and/or to do a daily build, without trampling on your
older, working builds, or accidentally setting up conflicting sets of modules.

Signed-off-by: Ryan Anderson <ryan@michonline.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

diff --git a/Makefile b/Makefile
index d01b004..c6aae86 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -548,6 +548,26 @@ export KBUILD_IMAGE ?= vmlinux
 # images. Default is /boot, but you can set it to other values
 export INSTALL_PATH ?= /boot
 
+# If CONFIG_LOCALVERSION_AUTO is set, we automatically perform some tests
+# and try to determine if the current source tree is a release tree, of any sort,
+# or if is a pure development tree.
+#
+# A 'release tree' is any tree with a git TAG associated
+# with it.  The primary goal of this is to make it safe for a native
+# git/CVS/SVN user to build a release tree (i.e, 2.6.9) and also to
+# continue developing against the current Linus tree, without having the Linus
+# tree overwrite the 2.6.9 tree when installed.
+#
+# Currently, only git is supported.
+# Other SCMs can edit scripts/setlocalversion and add the appropriate
+# checks as needed.
+
+
+ifdef CONFIG_LOCALVERSION_AUTO
+       localversion-auto := $(shell $(PERL) $(srctree)/scripts/setlocalversion $(srctree))
+       LOCALVERSION := $(LOCALVERSION)$(localversion-auto)
+endif
+
 #
 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
 # relocations required by build roots.  This is not defined in the

diff --git a/init/Kconfig b/init/Kconfig
index eb86972..f27fc48 100644 (file)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -77,6 +77,22 @@ config LOCALVERSION
          object and source tree, in that order.  Your total string can
          be a maximum of 64 characters.
 
+config LOCALVERSION_AUTO
+       bool "Automatically append version information to the version string"
+       default y
+       help
+         This will try to automatically determine if the current tree is a
+         release tree by looking for git tags that
+         belong to the current top of tree revision.
+
+         A string of the format -gxxxxxxxx will be added to the localversion
+         if a git based tree is found.  The string generated by this will be
+         appended after any matching localversion* files, and after the value
+         set in CONFIG_LOCALVERSION
+
+         Note: This requires Perl, and a git repository, but not necessarily
+         the git or cogito tools to be installed.
+
 config SWAP
        bool "Support for paging of anonymous memory (swap)"
        depends on MMU

diff --cc scripts/setlocalversion
Simple merge