boot-libre: add --gen-blob-script to generate a deblob script

This should enable various distributions and build system to reuse
the generated script to deblob u-boot releases themselves.

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>

1 files changed, 87 insertions, 6 deletions

diff --git a/resources/scripts/download/u-boot b/resources/scripts/download/u-boot
index b67d6bd0..8c94d338 100755
--- a/resources/scripts/download/u-boot
+++ b/resources/scripts/download/u-boot
@@ -105,27 +105,83 @@ strip_comments()
 		sed '/^$/d'
 }
 
+generate_deblob_script()
+{
+	blob_list_file="$1"
+	output="$2"
+
+	# Add sheebang and copyright headers from this file
+	awk '{
+		if ($0 !~ /^#/ && NF > 0) {
+			stop=1;
+		}
+		if (stop !=1) {
+			printf("%s\n", $0);
+		}
+	}' $0 >> ${output}
+
+	# Add rm -rf before directories and rm -f before files
+	awk \
+	'{
+	}{
+		if (NF == 0) {
+			printf("\n");
+		} else {
+			if ($0 !~ /#/ && $NF ~ /\/$/) {
+				printf("rm -rf %s\n", $0);
+			} else if ($0 !~ /#/) {
+				printf("rm -f %s\n", $0);
+			} else {
+				# We have comments, try to see if they are
+				# still valid paths before the comments
+				comments_found=0
+				last_field=0
+				for(i=1; i<=NF; i++) {
+					if($i ~ /#/) {
+						comments_found=1;
+					} else if(comments_found != 1) {
+						last_field=i;
+					}
+				}
+				if (last_field == 0) {
+					printf("%s\n", $0);
+				} else if ($last_field ~ /\/$/) {
+					printf("rm -rf %s\n", $0);
+				} else {
+					printf("rm -f %s\n", $0);
+				}
+			}
+		}
+	}' "${blob_list_file}" >> "${output}"
+}
+
 usage()
 {
 	progname="./download u-boot"
 
 	printf "Usage:\n"
-	printf "\t%s                         # %s\n" \
+	printf "\t%s                                # %s\n" \
 	       "${progname}" \
 	       "Download latest u-boot git revision and deblob it"
-	printf "\t%s [revision]              # %s\n" \
+	printf "\t%s [revision]                     # %s\n" \
 	       "${progname}" \
 	       "Download given u-boot git revision and deblob it"
-	printf "\t%s --blobs-list            # %s\n" \
+	printf "\t%s --blobs-list                   # %s\n" \
 	       "${progname}" \
 	       "Print the path of the blobs.list file for the latest supported u-boot revision"
-	printf "\t%s --blobs-list [revision] # %s\n" \
+	printf "\t%s --blobs-list [revision]        # %s\n" \
 	       "${progname}" \
 	       "Print the path of the blobs.list file for the given u-boot revision"
-	printf "\t%s --list-revisions        # %s\n" \
+	printf "\t%s --gen-deblob-script            # %s\n" \
+	       "${progname}" \
+	       "Print the path of the generated deblob script for the latest supported u-boot revision"
+	printf "\t%s --gen-deblob-script [revision] # %s\n" \
+	       "${progname}" \
+	       "Print the path of the generated deblob script for the given u-boot revision"
+	printf "\t%s --list-revisions               # %s\n" \
 	       "${progname}" \
 	       "List supported u-boot revisions"
-	printf "\t%s --help                  # %s\n" \
+	printf "\t%s --help                         # %s\n" \
 	       "${progname}" \
 	       "Prints this help"
 }
@@ -163,6 +219,15 @@ print_blobs_list_path()
 	printf "resources/u-boot/default/blobs.list\n"
 }
 
+print_deblob_script_path()
+{
+	version="$1"
+	path="$(mktemp)"
+
+	generate_deblob_script "$(print_blobs_list_path ${version})" "${path}"
+	printf "%s\n" ${path}
+}
+
 if [ $# -eq 0 ] ; then
 	latest_revision="$(echo ${supported_uboot_revisions} | tail -n1)"
 	download_uboot_revision "${latest_revision}"
@@ -191,6 +256,22 @@ elif [ $# -eq 2 -a "$1" == "--blobs-list" ] ; then
 	printf "Error: Revision '${1}' is not supported\n"
 
 	exit 1
+elif [ $# -eq 1 -a "$1" == "--gen-deblob-script" ] ; then
+	latest_revision="$(echo ${supported_uboot_revisions} | tail -n1)"
+	print_deblob_script_path "${latest_revision}"
+	exit 0
+elif [ $# -eq 2 -a "$1" == "--gen-deblob-script" ] ; then
+	found=0
+	for revision in ${supported_uboot_revisions} ; do
+		if [ "${revision}" = "$2" ] ; then
+			print_deblob_script_path "$2"
+			exit 0
+		fi
+	done
+
+	printf "Error: Revision '${1}' is not supported\n"
+
+	exit 1
 elif [ $# -eq 1 ] ; then
 	found=0
 	for revision in ${supported_uboot_revisions} ; do