[Buildroot] [PATCH] [PATCH][RFC] new target: live filesystem

[Jérémy Rosen]

add a new target to deploy a live filesystem to be used by NFS

---

Hello everybody

this patch is not ready for commit, it's a proposal to help me solve the very common use case of
a developement FS deployed on NFS. I am not very happy of how it's done at this point but I would
like to discuss it to see if it has a chance to get merged... What I don't like (and would gladly
have ideas on how to solve this)
* no dependency on host-sudo, i'm not sure how to add that
* using sudo to break out of fakeroot is not clean
* I am abusing the fs building framework, but I don't know of a cleaner way
* filesystem can only be under output/images at this point

so this patch is more to start a discussion than anything, i'll gladly take any comments or plain
'ol rejection if the project doesn't want it... but if there is some interest i'll work it into
something mainline worthy

Regards

Jérémy Rosen
---
 fs/Config.in      |    1 +
 fs/live/Config.in |   16 ++++++++++++++++
 fs/live/live.mk   |   23 +++++++++++++++++++++++
 3 files changed, 40 insertions(+)
 create mode 100644 fs/live/Config.in
 create mode 100644 fs/live/live.mk

diff --git a/fs/Config.in b/fs/Config.in
index 94154ea..de2377e 100644
--- a/fs/Config.in
+++ b/fs/Config.in
@@ -11,5 +11,6 @@ source "fs/cpio/Config.in"
 source "fs/iso9660/Config.in"
 source "fs/initramfs/Config.in"
 source "fs/romfs/Config.in"
+source "fs/live/Config.in"
 
 endmenu
diff --git a/fs/live/Config.in b/fs/live/Config.in
new file mode 100644
index 0000000..bf24754
--- /dev/null
+++ b/fs/live/Config.in
@@ -0,0 +1,16 @@
+config BR2_TARGET_ROOTFS_LIVE
+	bool "live root filesystem"
+	help
+	  uses sudo to create a live image of the filesystem
+	  this is mainly usefull if you want to use your filesystem
+	  over NFS
+config BR2_TARGET_ROOTFS_LIVE_DEST
+	string "directory to put the live image"
+	depends on BR2_TARGET_ROOTFS_LIVE
+	default "live"
+	help
+	  The directory where the image should be stored.
+	  this directory will be emptied and recreated, it is given
+	  relative to the buildroot output/images directory
+
+
diff --git a/fs/live/live.mk b/fs/live/live.mk
new file mode 100644
index 0000000..73bcd3e
--- /dev/null
+++ b/fs/live/live.mk
@@ -0,0 +1,23 @@
+#############################################################
+#
+# Build the live root filesystem directory
+#
+#############################################################
+
+LIVE_OPTS :=
+
+
+ROOTFS_LIVE_DEPENDENCIES = #host-sudo
+
+define ROOTFS_LIVE_CMD
+ sudo cp -r $(TARGET_DIR)/* $(BINARIES_DIR)/$(BR2_TARGET_ROOTFS_LIVE_DEST)/
+endef
+
+define ROOTFS_LIVE_INIT
+	sudo rm -rf $(BINARIES_DIR)/$(BR2_TARGET_ROOTFS_LIVE_DEST)
+	sudo mkdir $(BINARIES_DIR)/$(BR2_TARGET_ROOTFS_LIVE_DEST)
+endef
+
+ROOTFS_LIVE_PRE_GEN_HOOKS += ROOTFS_LIVE_INIT
+
+$(eval $(call ROOTFS_TARGET,live))
-- 
1.7.10.4