[openwrt/openwrt] scripts/mkits.sh: move out .pagesync generation for RootFS blob

[LEDE Commits]

ansuel pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/c70894c855e54624b918ab50c9afa53301c462d4

commit c70894c855e54624b918ab50c9afa53301c462d4
Author: Christian Marangi <ansuelsmth at gmail.com>
AuthorDate: Thu Oct 23 15:31:46 2025 +0200

    scripts/mkits.sh: move out .pagesync generation for RootFS blob
    
    It's expected the mkits.sh script to generate only the relevant DTS
    entry and have all the blob already prepared to use for mkimage.
    
    This is not the case for the RootFS case where the script generates a
    .pagesync with the dd command.
    
    To better handle this, drop the dd command and instead error out if the
    .pagesync blob is not found if RootFS is used.
    
    Adapt the generic fit build in image-commands.mk to call the dd for
    .pagesync right before mkits.sh.
    
    Link: https://github.com/openwrt/openwrt/pull/20492
    Signed-off-by: Christian Marangi <ansuelsmth at gmail.com>
---
 include/image-commands.mk | 39 +++++++++++++++++++++------------------
 scripts/mkits.sh          |  6 +++++-
 2 files changed, 26 insertions(+), 19 deletions(-)

diff --git a/include/image-commands.mk b/include/image-commands.mk
index 33c2ef89ad..9ceec323b7 100644
--- a/include/image-commands.mk
+++ b/include/image-commands.mk
@@ -431,24 +431,27 @@ define Build/initrd_compression
 endef
 
 define Build/fit
-	$(call locked,$(TOPDIR)/scripts/mkits.sh \
-		-D $(DEVICE_NAME) -o $@.its -k $@ \
-		-C $(word 1,$(1)) \
-		$(if $(word 2,$(1)),\
-			$(if $(findstring 11,$(if $(DEVICE_DTS_OVERLAY),1)$(if $(findstring $(KERNEL_BUILD_DIR)/image-,$(word 2,$(1))),,1)), \
-				-d $(KERNEL_BUILD_DIR)/image-$$(basename $(word 2,$(1))), \
-				-d $(word 2,$(1)))) \
-		$(if $(findstring with-rootfs,$(word 3,$(1))),-r $(IMAGE_ROOTFS)) \
-		$(if $(findstring with-initrd,$(word 3,$(1))), \
-			$(if $(CONFIG_TARGET_ROOTFS_INITRAMFS_SEPARATE), \
-				-i $(KERNEL_BUILD_DIR)/initrd$(if $(TARGET_PER_DEVICE_ROOTFS),.$(ROOTFS_ID/$(DEVICE_NAME))).cpio$(strip $(call Build/initrd_compression)))) \
-		-a $(KERNEL_LOADADDR) -e $(if $(KERNEL_ENTRY),$(KERNEL_ENTRY),$(KERNEL_LOADADDR)) \
-		$(if $(DEVICE_FDT_NUM),-n $(DEVICE_FDT_NUM)) \
-		$(if $(DEVICE_DTS_DELIMITER),-l $(DEVICE_DTS_DELIMITER)) \
-		$(if $(DEVICE_DTS_LOADADDR),-s $(DEVICE_DTS_LOADADDR)) \
-		$(if $(DEVICE_DTS_OVERLAY),$(foreach dtso,$(DEVICE_DTS_OVERLAY), -O $(dtso):$(KERNEL_BUILD_DIR)/image-$(dtso).dtbo)) \
-		-c $(if $(DEVICE_DTS_CONFIG),$(DEVICE_DTS_CONFIG),"config-1") \
-		-A $(LINUX_KARCH) -v $(LINUX_VERSION), gen-cpio$(if $(TARGET_PER_DEVICE_ROOTFS),.$(ROOTFS_ID/$(DEVICE_NAME))))
+	$(call locked, { \
+		$(if $(findstring with-rootfs,$(word 3,$(1))),dd if=$(IMAGE_ROOTFS) of=$(IMAGE_ROOTFS).pagesync bs=4096 conv=sync;) \
+		$(TOPDIR)/scripts/mkits.sh \
+			-D $(DEVICE_NAME) -o $@.its -k $@ \
+			-C $(word 1,$(1)) \
+			$(if $(word 2,$(1)),\
+				$(if $(findstring 11,$(if $(DEVICE_DTS_OVERLAY),1)$(if $(findstring $(KERNEL_BUILD_DIR)/image-,$(word 2,$(1))),,1)), \
+					-d $(KERNEL_BUILD_DIR)/image-$$(basename $(word 2,$(1))), \
+					-d $(word 2,$(1)))) \
+			$(if $(findstring with-rootfs,$(word 3,$(1))),-r $(IMAGE_ROOTFS)) \
+			$(if $(findstring with-initrd,$(word 3,$(1))), \
+				$(if $(CONFIG_TARGET_ROOTFS_INITRAMFS_SEPARATE), \
+					-i $(KERNEL_BUILD_DIR)/initrd$(if $(TARGET_PER_DEVICE_ROOTFS),.$(ROOTFS_ID/$(DEVICE_NAME))).cpio$(strip $(call Build/initrd_compression)))) \
+			-a $(KERNEL_LOADADDR) -e $(if $(KERNEL_ENTRY),$(KERNEL_ENTRY),$(KERNEL_LOADADDR)) \
+			$(if $(DEVICE_FDT_NUM),-n $(DEVICE_FDT_NUM)) \
+			$(if $(DEVICE_DTS_DELIMITER),-l $(DEVICE_DTS_DELIMITER)) \
+			$(if $(DEVICE_DTS_LOADADDR),-s $(DEVICE_DTS_LOADADDR)) \
+			$(if $(DEVICE_DTS_OVERLAY),$(foreach dtso,$(DEVICE_DTS_OVERLAY), -O $(dtso):$(KERNEL_BUILD_DIR)/image-$(dtso).dtbo)) \
+			-c $(if $(DEVICE_DTS_CONFIG),$(DEVICE_DTS_CONFIG),"config-1") \
+			-A $(LINUX_KARCH) -v $(LINUX_VERSION) \
+	}, gen-cpio$(if $(TARGET_PER_DEVICE_ROOTFS),.$(ROOTFS_ID/$(DEVICE_NAME))))
 	$(call locked,PATH=$(LINUX_DIR)/scripts/dtc:$(PATH) mkimage $(if $(findstring external,$(word 3,$(1))),\
 		-E -B 0x1000 $(if $(findstring static,$(word 3,$(1))),-p 0x1000)) -f $@.its $@.new, \
 	  gen-cpio$(if $(TARGET_PER_DEVICE_ROOTFS),.$(ROOTFS_ID/$(DEVICE_NAME))))
diff --git a/scripts/mkits.sh b/scripts/mkits.sh
index 46ab5ee023..fc2b580ee2 100755
--- a/scripts/mkits.sh
+++ b/scripts/mkits.sh
@@ -82,6 +82,11 @@ if [ -z "${ARCH}" ] || [ -z "${COMPRESS}" ] || [ -z "${LOAD_ADDR}" ] || \
 	usage
 fi
 
+if [ -n "${ROOTFS}" ] && [ ! -f "${ROOTFS}".pagesync ]; then
+	echo "Missing .pagesync blob for RootFS blob '${ROOTFS}'"
+	exit 1
+fi
+
 ARCH_UPPER=$(echo "$ARCH" | tr '[:lower:]' '[:upper:]')
 
 if [ -n "${COMPATIBLE}" ]; then
@@ -136,7 +141,6 @@ fi
 
 
 if [ -n "${ROOTFS}" ]; then
-	dd if="${ROOTFS}" of="${ROOTFS}.pagesync" bs=4096 conv=sync
 	ROOTFS_NODE="
 		rootfs${REFERENCE_CHAR}$ROOTFSNUM {
 			description = \"${ARCH_UPPER} OpenWrt ${DEVICE} rootfs\";