[Buildroot] [git commit] fs: set per-rootfs variable name

[Peter Korsgaard]

commit: https://git.buildroot.net/buildroot/commit/?id=2765973e01b386131d9f2ebb8a89a403a381d5e7
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/master

Like we do for packages with the PKG variable, set ROOTFS to contain the
upper-case name of the rootfs currently being generated.

This will be useful in later patches, when we need more per-rootfs
variables, like a per-rootfs TARGET_DIR for example.

In Makefiles, per-rule variables trickle down the dependency chain, to
all dependencies of that rule, so we have to stop ROOTFS as soon as
we're not in a rootfs. This means we have to stop it at target-finalize
(which is a dependency of all filesystems), and for each package
individually, since some packages (host or target) can be direct
dependencies of filesystems as well.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998 at free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni at bootlin.com>
Cc: Arnout Vandecappelle <arnout at mind.be>
Signed-off-by: Peter Korsgaard <peter at korsgaard.com>
---
 Makefile               | 3 +++
 fs/common.mk           | 1 +
 package/pkg-generic.mk | 4 ++++
 3 files changed, 8 insertions(+)

diff --git a/Makefile b/Makefile
index 6eca3c9ec6..6cfe83072e 100644
--- a/Makefile
+++ b/Makefile
@@ -677,6 +677,9 @@ endif
 
 $(TARGETS_ROOTFS): target-finalize
 
+# Avoid the rootfs name leaking down the dependency chain
+target-finalize: ROOTFS=
+
 .PHONY: target-finalize
 target-finalize: $(PACKAGES)
 	@$(call MESSAGE,"Finalizing target directory")
diff --git a/fs/common.mk b/fs/common.mk
index 274a3e9c7b..19a975aa47 100644
--- a/fs/common.mk
+++ b/fs/common.mk
@@ -72,6 +72,7 @@ ROOTFS_$(2)_COMPRESS_EXT = .xz
 ROOTFS_$(2)_COMPRESS_CMD = xz -9 -C crc32 -c
 endif
 
+$$(BINARIES_DIR)/rootfs.$(1): ROOTFS=$(2)
 $$(BINARIES_DIR)/rootfs.$(1): target-finalize $$(ROOTFS_$(2)_DEPENDENCIES)
 	@$$(call MESSAGE,"Generating root filesystem image rootfs.$(1)")
 	rm -rf $(FS_DIR)
diff --git a/package/pkg-generic.mk b/package/pkg-generic.mk
index 6d82f7027e..152e1d0c67 100644
--- a/package/pkg-generic.mk
+++ b/package/pkg-generic.mk
@@ -384,6 +384,10 @@ endef
 
 define inner-generic-package
 
+# When doing a package, we're definitely not doing a rootfs, but we
+# may inherit it via the dependency chain, so we reset it.
+$(1): ROOTFS=
+
 # Ensure the package is only declared once, i.e. do not accept that a
 # package be re-defined by a br2-external tree
 ifneq ($(call strip,$(filter $(1),$(PACKAGES_ALL))),)