build: bootstrap missing sources even with IGNORE_UPDATES

- If IGNORE_UPDATES=yes, still fetch kernel/u-boot/ATF once when local trees are missing\n- fetch_from_repo: fallback to upstream GitHub when mirror lacks requested ref; disable partial-clone settings

scripts/general.sh

@@ -500,6 +500,7 @@ fetch_from_repo()
 	local dir=$2
 	local ref=$3
 	local ref_subdir=$4
+	local upstream_url=$1
 
 	# Set GitHub mirror before anything else touches $url
 	url=${url//'https://github.com/'/$GITHUB_SOURCE'/'}
@@ -555,6 +556,18 @@ fetch_from_repo()
 		offline=false
 	fi
 
+	# If this repo was left in a partial-clone state (e.g. filter=blob:none),
+	# checkouts can degrade into extremely slow per-blob fetches.
+	# Disable it to ensure reliable, reasonably fast builds.
+	if [[ "$(git config --bool --get remote.origin.promisor 2>/dev/null)" == "true" || \
+		-n "$(git config --get remote.origin.partialclonefilter 2>/dev/null)" || \
+		-n "$(git config --get extensions.partialclone 2>/dev/null)" ]]; then
+		display_alert "Disabling partial clone settings" "${workdir}" "wrn"
+		git config --unset-all remote.origin.promisor >/dev/null 2>&1 || true
+		git config --unset-all remote.origin.partialclonefilter >/dev/null 2>&1 || true
+		git config --unset-all extensions.partialclone >/dev/null 2>&1 || true
+	fi
+
 	local changed=false
 
 	# when we work offline we simply return the sources to their original state
@@ -567,14 +580,32 @@ fetch_from_repo()
 			# TODO: grep refs/heads/$name
 			local remote_hash
 			remote_hash=$(improved_git ls-remote -h "${url}" "$ref_name" | head -1 | cut -f1)
+			if [[ -z $remote_hash && $url != "$upstream_url" ]]; then
+				display_alert "Mirror missing ref; falling back" "$ref_name" "wrn"
+				url="$upstream_url"
+				git remote set-url origin "${url}" >/dev/null 2>&1 || true
+				remote_hash=$(improved_git ls-remote -h "${url}" "$ref_name" | head -1 | cut -f1)
+			fi
 			[[ -z $local_hash || "${local_hash}" != "${remote_hash}" ]] && changed=true
 			;;
 
 			tag)
 			local remote_hash
 			remote_hash=$(improved_git ls-remote -t "${url}" "$ref_name" | cut -f1)
+			if [[ -z $remote_hash && $url != "$upstream_url" ]]; then
+				display_alert "Mirror missing tag; falling back" "$ref_name" "wrn"
+				url="$upstream_url"
+				git remote set-url origin "${url}" >/dev/null 2>&1 || true
+				remote_hash=$(improved_git ls-remote -t "${url}" "$ref_name" | cut -f1)
+			fi
 			if [[ -z $local_hash || "${local_hash}" != "${remote_hash}" ]]; then
 				remote_hash=$(improved_git ls-remote -t "${url}" "$ref_name^{}" | cut -f1)
+				if [[ -z $remote_hash && $url != "$upstream_url" ]]; then
+					display_alert "Mirror missing tag deref; falling back" "$ref_name" "wrn"
+					url="$upstream_url"
+					git remote set-url origin "${url}" >/dev/null 2>&1 || true
+					remote_hash=$(improved_git ls-remote -t "${url}" "$ref_name^{}" | cut -f1)
+				fi
 				[[ -z $remote_hash || "${local_hash}" != "${remote_hash}" ]] && changed=true
 			fi
 			;;
@@ -582,6 +613,12 @@ fetch_from_repo()
 			head)
 			local remote_hash
 			remote_hash=$(improved_git ls-remote "${url}" HEAD | cut -f1)
+			if [[ -z $remote_hash && $url != "$upstream_url" ]]; then
+				display_alert "Mirror missing HEAD; falling back" "HEAD" "wrn"
+				url="$upstream_url"
+				git remote set-url origin "${url}" >/dev/null 2>&1 || true
+				remote_hash=$(improved_git ls-remote "${url}" HEAD | cut -f1)
+			fi
 			[[ -z $local_hash || "${local_hash}" != "${remote_hash}" ]] && changed=true
 			;;
 

scripts/main.sh

@@ -446,7 +446,9 @@ prepare_host
 
 # fetch_from_repo <url> <dir> <ref> <subdir_flag>
 
+
 # ignore updates help on building all images - for internal purposes
+# When IGNORE_UPDATES=yes, still fetch once if required sources are missing.
 if [[ ${IGNORE_UPDATES} != yes ]]; then
 
 	display_alert "Downloading sources" "" "info"
@@ -583,6 +585,27 @@ if [[ $BUILD_OPT == u-boot || $BUILD_OPT == image ]]; then
 			display_alert "File name" "${CHOSEN_UBOOT}_${REVISION}_${ARCH}.deb" "info"
 		fi
 	fi
+
+else
+
+	# IGNORE_UPDATES=yes: prefer local trees, but bootstrap missing sources to avoid hard failures.
+	# Kernel: if the tree isn't populated, it will be missing the top-level Makefile.
+	if [[ $BUILD_OPT =~ kernel|image && ! -f "${LINUXSOURCEDIR}/Makefile" ]]; then
+		display_alert "Kernel sources missing; downloading once" "(IGNORE_UPDATES=yes)" "wrn"
+		fetch_from_repo "$KERNELSOURCE" "$KERNELDIR" "$KERNELBRANCH" "yes"
+	fi
+
+	# U-Boot/ATF are required for image builds; fetch once if missing.
+	if [[ $BOARDFAMILY != "cix" && $BUILD_OPT =~ u-boot|image && ! -f "${BOOTSOURCEDIR}/Makefile" ]]; then
+		display_alert "U-Boot sources missing; downloading once" "(IGNORE_UPDATES=yes)" "wrn"
+		fetch_from_repo "$BOOTSOURCE" "$BOOTDIR" "$BOOTBRANCH" "yes"
+	fi
+
+	if [[ -n ${ATFSOURCE} && $BUILD_OPT =~ u-boot|image && ! -f "${EXTER}/cache/sources/${ATFSOURCEDIR}/Makefile" ]]; then
+		display_alert "ATF sources missing; downloading once" "(IGNORE_UPDATES=yes)" "wrn"
+		fetch_from_repo "$ATFSOURCE" "${EXTER}/cache/sources/$ATFDIR" "$ATFBRANCH" "yes"
+	fi
+
 fi
 
 # Compile kernel if packed .deb does not exist or use the one from Orange Pi