[ptxdist] [PATCH] image-root-squashfs: add rules for generic squashfs image

["Baeuerle, Florian" <Florian.Baeuerle@allegion.com>]

This adds rules for generating a squashfs image from the root
filesystem via genimage.

Since genimage does not seem to support squashfs-tools v3.x, this
package conflicts with that option.
---
 config/images/squashfs.config    |  8 ++++
 platforms/image-root-squashfs.in | 77 ++++++++++++++++++++++++++++++++
 rules/image-root-squashfs.make   | 41 +++++++++++++++++
 3 files changed, 126 insertions(+)
 create mode 100644 config/images/squashfs.config
 create mode 100644 platforms/image-root-squashfs.in
 create mode 100644 rules/image-root-squashfs.make

diff --git a/config/images/squashfs.config b/config/images/squashfs.config
new file mode 100644
index 000000000..605fcb7a5
--- /dev/null
+++ b/config/images/squashfs.config
@@ -0,0 +1,8 @@
+image @IMAGE@ {
+	squashfs {
+		extraargs = "@EXTRA_ARGS@"
+		compression = @COMPRESSION_MODE@
+		block-size = @BLOCK_SIZE@
+	}
+	name = "root"
+}
diff --git a/platforms/image-root-squashfs.in b/platforms/image-root-squashfs.in
new file mode 100644
index 000000000..d29540310
--- /dev/null
+++ b/platforms/image-root-squashfs.in
@@ -0,0 +1,77 @@
+## SECTION=image
+
+comment "root.squashfs conflicts with squashfs-3.x"
+	depends on HOST_SQUASHFS_TOOLS_V3X
+
+menuconfig IMAGE_ROOT_SQUASHFS
+	tristate
+	select HOST_GENIMAGE
+	select HOST_SQUASHFS_TOOLS
+	select IMAGE_ROOT_TGZ
+	depends on !HOST_SQUASHFS_TOOLS_V3X
+	prompt "Generate images/root.squashfs "
+	help
+	  Build squashfs images of the root filesystem. This image can be stored
+	  linearly into target's flash device at the start of the desired
+	  partition. You should erase the whole partition first if the image
+	  is smaller than partition's size. If not, garbage data in the remaining
+	  space could confuse the filesystem driver.
+
+if IMAGE_ROOT_SQUASHFS
+
+choice
+	prompt "squashfs compression mode"
+	help
+	  Select your prefered compression mode.
+
+	config IMAGE_ROOT_SQUASHFS_COMPRESSION_MODE_GZIP
+	bool "gzip"
+	help
+	  Select your prefered compression mode.
+
+	config IMAGE_ROOT_SQUASHFS_COMPRESSION_MODE_LZMA
+	bool "lzma"
+	help
+	  Select your prefered compression mode.
+
+	config IMAGE_ROOT_SQUASHFS_COMPRESSION_MODE_LZO
+	bool "lzo"
+	help
+	  Select your prefered compression mode.
+
+	config IMAGE_ROOT_SQUASHFS_COMPRESSION_MODE_LZ4
+	bool "lz4"
+	help
+	  Select your prefered compression mode.
+
+	config IMAGE_ROOT_SQUASHFS_COMPRESSION_MODE_XZ
+	bool "xz"
+	help
+	  Select your prefered compression mode.
+
+endchoice
+
+config IMAGE_ROOT_SQUASHFS_COMPRESSION_MODE
+        string
+        default "gzip" if IMAGE_ROOT_SQUASHFS_COMPRESSION_MODE_GZIP
+        default "lzma" if IMAGE_ROOT_SQUASHFS_COMPRESSION_MODE_LZMA
+        default "lzo" if IMAGE_ROOT_SQUASHFS_COMPRESSION_MODE_LZO
+        default "lz4" if IMAGE_ROOT_SQUASHFS_COMPRESSION_MODE_LZ4
+        default "xz" if IMAGE_ROOT_SQUASHFS_COMPRESSION_MODE_XZ
+
+config IMAGE_ROOT_SQUASHFS_BLOCK_SIZE
+	string
+	default "128k"
+	prompt "Block size"
+	help
+	  This allows the compression data block size to be selected, both "K" and "M"
+	  postfixes are supported.
+
+config IMAGE_ROOT_SQUASHFS_EXTRA_ARGS
+	string
+	default ""
+	prompt "extra arguments passed to mksquashfs"
+	help
+	  You can add extra arguments for mksquashfs here
+
+endif
diff --git a/rules/image-root-squashfs.make b/rules/image-root-squashfs.make
new file mode 100644
index 000000000..ce79943f3
--- /dev/null
+++ b/rules/image-root-squashfs.make
@@ -0,0 +1,41 @@
+# -*-makefile-*-
+#
+# Copyright (C) 2018 by Florian Bäuerle <florian.baeuerle@allegion.com>
+#
+# See CREDITS for details about who has contributed to this project.
+#
+# For further information about the PTXdist project and license conditions
+# see the README file.
+#
+
+#
+# We provide this package
+#
+IMAGE_PACKAGES-$(PTXCONF_IMAGE_ROOT_SQUASHFS) += image-root-squashfs
+
+#
+# Paths and names
+#
+IMAGE_ROOT_SQUASHFS		:= image-root-squashfs
+IMAGE_ROOT_SQUASHFS_DIR		:= $(BUILDDIR)/$(IMAGE_ROOT_SQUASHFS)
+IMAGE_ROOT_SQUASHFS_IMAGE	:= $(IMAGEDIR)/root.squashfs
+IMAGE_ROOT_SQUASHFS_FILES	:= $(IMAGEDIR)/root.tgz
+IMAGE_ROOT_SQUASHFS_CONFIG	:= squashfs.config
+
+# ----------------------------------------------------------------------------
+# Image
+# ----------------------------------------------------------------------------
+
+ifdef PTXCONF_IMAGE_ROOT_SQUASHFS
+IMAGE_ROOT_SQUASHFS_ENV := \
+	EXTRA_ARGS=$(PTXCONF_IMAGE_ROOT_SQUASHFS_EXTRA_ARGS) \
+	COMPRESSION_MODE=$(PTXCONF_IMAGE_ROOT_SQUASHFS_COMPRESSION_MODE) \
+	BLOCK_SIZE=$(PTXCONF_IMAGE_ROOT_SQUASHFS_BLOCK_SIZE)
+
+$(IMAGE_ROOT_SQUASHFS_IMAGE):
+	@$(call targetinfo)
+	@$(call image/genimage, IMAGE_ROOT_SQUASHFS)
+	@$(call finish)
+endif
+
+# vim: syntax=make
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