utils/bump-stable-kernel-versions: automatically commit result

Since this script is often used to bump kernel versions in multiple
Buildroot branches, it makes sense to simply commit changes directly
rather than letting the developer do it by hand.

Signed-off-by: Titouan Christophe <titouan.christophe@mind.be>
Signed-off-by: Arnout Vandecappelle <arnout@rnout.be>
(cherry picked from commit fab50ed3b1)
Signed-off-by: Thomas Perale <thomas.perale@mind.be>

utils/bump-stable-kernel-versions

@@ -25,6 +25,7 @@ latest_version=$(sed -rn 's|^\tdefault "(.+)" if BR2_LINUX_KERNEL_LATEST_VERSION
 latest_release_version=$(echo "${latest_version}" | cut -f 1-2 -d .)
 echo "${latest_version} -> ${latest_release_version}"
 
+updated_files_list=()
 updated_releases_list=''
 updated_versions='Update the latest kernel releases to:'
 
@@ -98,6 +99,7 @@ update_linux_hash() {
 
     # We were iterating over this file so we could not edit in-place.
     mv "$HASHFILE.new" "$HASHFILE"
+    updated_files_list+=("$HASHFILE")
 }
 
 while IFS= read -r -d '' hashfile; do
@@ -105,7 +107,12 @@ while IFS= read -r -d '' hashfile; do
 done < <(find linux/ -name '*.hash' -type f -print0)
 
 if [ -n "${updated_releases_list}" ]; then
-    echo ">>> Suggested subject: {linux, linux-headers}: bump${updated_releases_list//.x /.x, } series"
+    git add "${updated_files_list[@]}" linux/Config.in package/linux-headers/Config.in.host
+    git commit --verbose --edit --signoff --file=<( {
+        echo "{linux, linux-headers}: bump${updated_releases_list//.x /.x, } series"
+        echo
+        echo "${updated_versions}"
+    } )
 else
     echo '>>> Nothing happened.'
 fi