[gentoo-kernel] Installation location in kernel-2.eclass

[gentoo-kernel] Installation location in kernel-2.eclass

[Daniel Gryniewicz]

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Hey, all.

UML is a bit of a unique animal, in the kernel world.  You install it on
a box, and run it on that box, but it's not the kernel for that box.
For this reason, I think it would be useful to be able to install UML
into a different location than /usr/src.  I, for example, always do my
UML work in /home/os/uml, and would like to install it there.  I could
symlink, but that would break my bind mounts, and cause other problems,
so I always end up copying it.

Unfortunately, kernel-2.eclass hardcodes the install directory to
be /usr/src.  To get around this problem, I propose that a variable be
added to kernel-2.eclass (I named it K_TARGETDIR) that can be set in an
ebuild to install to somewhere else than /usr/src.  It should default,
of course, to /usr/src.  In usermode-sources, I'd use this as follows:

K_TARGETDIR=${USERMODE_TARGET_DIR:-"/usr/src"}

This would allow the user to specify USERMODE_TARGET_DIR in either
make.conf or on the command line, and install usermode-sources in that
directory, rather than /usr/src.

What do people think about this idea?  Is there a better way to do this?

Daniel

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Index: kernel-2.eclass
===================================================================
RCS file: /var/cvsroot/gentoo-x86/eclass/kernel-2.eclass,v
retrieving revision 1.182
diff -u -p -r1.182 kernel-2.eclass
--- kernel-2.eclass	17 Jul 2006 14:30:18 -0000	1.182
+++ kernel-2.eclass	23 Jul 2006 20:40:51 -0000
@@ -562,7 +562,7 @@ install_sources() {
 	local doc docs file
 
 	cd "${S}"
-	dodir /usr/src
+	dodir ${K_TARGETDIR:="/usr/src"}
 	echo ">>> Copying sources ..."
 
 	file="$(find ${WORKDIR} -iname "docs" -type d)"
@@ -591,7 +591,7 @@ install_sources() {
 		[[ -n ${docs} ]] && dodoc ${docs}
 	fi
 
-	mv ${WORKDIR}/linux* ${D}/usr/src
+	mv ${WORKDIR}/linux* ${D}/${K_TARGETDIR}
 }
 
 install_manpages() {

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