package/genext2fs: add host variant

genext2fs is built only if the user selected an ext2 root filesystem.

However, some use-cases can't live with the full target/ dir on the
root filesystem, and requires separate partitions (eg. for /usr).
In this case, the user would not select an ext2 root fs in the
Buildrooot menu, and would only generate a tarball of the rootfs.
This tarball would then be used from a post-image script to build
the actual required FSes.

But then, genext2fs is not built, since the ext2 root FS was not
selected.

As for the other filesystem generators, provide a host variant of
genext2fs (genext2fs is already host-package aware, so only needs
adding a Kconfig entry).

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

fs/ext2/Config.in

@@ -1,5 +1,6 @@
 config BR2_TARGET_ROOTFS_EXT2
 	bool "ext2/3/4 root filesystem"
+	select BR2_PACKAGE_HOST_GENEXT2FS
 	select BR2_PACKAGE_HOST_E2FSPROGS
 	help
 	  Build an ext2/3/4 root filesystem

package/Config.in.host

@@ -3,6 +3,7 @@ menu "Host utilities"
 source "package/dfu-util/Config.in.host"
 source "package/dosfstools/Config.in.host"
 source "package/e2fsprogs/Config.in.host"
+source "package/genext2fs/Config.in.host"
 source "package/genimage/Config.in.host"
 source "package/genpart/Config.in.host"
 source "package/lpc3250loader/Config.in.host"

package/genext2fs/Config.in.host

@@ -0,0 +1,9 @@
+config BR2_PACKAGE_HOST_GENEXT2FS
+	bool "host genext2fs"
+	help
+	  genext2fs generates an ext2 filesystem as a normal (non-root)
+	  user.  It does not require you to mount the image file to
+	  copy files on it, nor does it require that you become the
+	  superuser to make device nodes.
+
+	  http://genext2fs.sourceforge.net/