tools: Add script to update git subtree projects

Recently we are introducing multiple git subtree projects and
it is the right time to have a universal script to update
various subtrees and replace the dts/update-dts-subtree.sh.

update-subtree.sh is a wrapper of git subtree commands.

Usage: From U-Boot top directory,
run
$ ./tools/update-subtree.sh pull <subtree-name> <release-tag>
for pulling a tag from the upstream.
Or run
$ ./tools/update-subtree.sh pick <subtree-name> <commit-id>
for cherry-pick a commit from the upstream.

Currently <subtree-name> supports dts, mbedtls and lwip.

Signed-off-by: Raymond Mao <raymond.mao@linaro.org>

doc/develop/devicetree/control.rst

@@ -96,12 +96,12 @@ sync the `dts/upstream/` subtree from the devicetree-rebasing repo whenever
 the next branch opens (refer: :doc:`../release_cycle`) with the latest mainline
 Linux kernel release. To sync the `dts/upstream/` subtree, run::
 
-    ./dts/update-dts-subtree.sh pull <devicetree-rebasing-release-tag>
+    ./tools/update-subtree.sh pull dts <devicetree-rebasing-release-tag>
 
 If required it is also possible to cherry-pick fixes from the
 devicetree-rebasing repository prior to next sync, usage::
 
-    ./dts/update-dts-subtree.sh pick <devicetree-rebasing-commit-id>
+    ./tools/update-subtree.sh pick dts <devicetree-rebasing-commit-id>
 
 
 Configuration
@@ -116,8 +116,8 @@ However, if `dts/upstream/` hasn't yet received devicetree source file for your
 newly added board support then one option is that you can add the corresponding
 devicetree source file as `arch/<arch>/dts/<name>.dts`. To select that add `#
 CONFIG_OF_UPSTREAM is not set` and set `DEFAULT_DEVICE_TREE=<name>` when
-prompted by Kconfig. Another option is that you can use use the "pick" option of
-`dts/update-dts-subtree.sh` mentioned above to bring in the commits that you
+prompted by Kconfig. Another option is that you can use the "pick" option of
+`tools/update-subtree.sh` mentioned above to bring in the commits that you
 need.
 
 This should include your CPU or SoC's devicetree file. On top of that any U-Boot

dts/update-dts-subtree.sh

@@ -1,48 +0,0 @@
-#!/bin/sh
-# SPDX-License-Identifier: GPL-2.0+
-#
-# Copyright 2024 Linaro Ltd.
-#
-# Usage: from the top level U-Boot source tree, run:
-# $ ./dts/update-dts-subtree.sh pull <release-tag>
-# $ ./dts/update-dts-subtree.sh pick <commit-id>
-#
-# The script will pull changes from devicetree-rebasing repo into U-Boot
-# as a subtree located as <U-Boot>/dts/upstream sub-directory. It will
-# automatically create a squash/merge commit listing the commits imported.
-
-set -e
-
-merge_commit_msg=$(cat << EOF
-Subtree merge tag '$2' of devicetree-rebasing repo [1] into dts/upstream
-
-[1] https://git.kernel.org/pub/scm/linux/kernel/git/devicetree/devicetree-rebasing.git/
-EOF
-)
-
-remote_add_and_fetch() {
-    if ! git remote get-url devicetree-rebasing 2>/dev/null
-    then
-        echo "Warning: Script automatically adds new git remote via:"
-        echo "    git remote add devicetree-rebasing \\"
-        echo "        https://git.kernel.org/pub/scm/linux/kernel/git/devicetree/devicetree-rebasing.git"
-        git remote add devicetree-rebasing \
-            https://git.kernel.org/pub/scm/linux/kernel/git/devicetree/devicetree-rebasing.git
-    fi
-    git fetch devicetree-rebasing master
-}
-
-if [ "$1" = "pull" ]
-then
-    remote_add_and_fetch
-    git subtree pull --prefix dts/upstream devicetree-rebasing \
-        "$2" --squash -m "${merge_commit_msg}"
-elif [ "$1" = "pick" ]
-then
-    remote_add_and_fetch
-    git cherry-pick -x --strategy=subtree -Xsubtree=dts/upstream/ "$2"
-else
-    echo "usage: $0 <op> <ref>"
-    echo "  <op>     pull or pick"
-    echo "  <ref>    release tag [pull] or commit id [pick]"
-fi

tools/update-subtree.sh

@@ -0,0 +1,85 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Copyright (c) 2024 Linaro Limited
+#
+# Usage: from the top level U-Boot source tree, run:
+# $ ./tools/update-subtree.sh pull <subtree-name> <release-tag>
+# Or:
+# $ ./tools/update-subtree.sh pick <subtree-name> <commit-id>
+#
+# The script will pull changes from subtree repo into U-Boot.
+# It will automatically create a squash/merge commit listing the commits
+# imported.
+
+set -e
+
+print_usage() {
+    echo "usage: $0 <op> <subtree-name> <ref>"
+    echo "  <op>           pull or pick"
+    echo "  <subtree-name> mbedtls or dts or lwip"
+    echo "  <ref>          release tag [pull] or commit id [pick]"
+}
+
+if [ $# -ne 3 ]; then
+    print_usage
+    exit 1
+fi
+
+op=$1
+subtree_name=$2
+ref=$3
+
+set_params() {
+    case "$subtree_name" in
+        mbedtls)
+            path=lib/mbedtls/external/mbedtls
+            repo_url=https://github.com/Mbed-TLS/mbedtls.git
+            remote_name="mbedtls_upstream"
+            ;;
+        dts)
+            path=dts/upstream
+            repo_url=https://git.kernel.org/pub/scm/linux/kernel/git/devicetree/devicetree-rebasing.git
+            remote_name="devicetree-rebasing"
+            ;;
+        lwip)
+            path=lib/lwip/lwip
+            repo_url=https://git.savannah.gnu.org/git/lwip.git
+            remote_name="lwip_upstream"
+            ;;
+        *)
+            echo "Invalid subtree name: $subtree_name"
+            print_usage
+            exit 1
+    esac
+}
+
+set_params
+
+merge_commit_msg=$(cat << EOF
+Subtree merge tag '$ref' of $subtree_name repo [1] into $path
+
+[1] $repo_url
+EOF
+)
+
+remote_add_and_fetch() {
+    if [ -z "$(git remote get-url $remote_name 2>/dev/null)" ]; then
+        echo "Warning: Script automatically adds new git remote via:"
+        echo "    git remote add $remote_name \\"
+        echo "        $repo_url"
+        git remote add $remote_name $repo_url
+    fi
+    git fetch $remote_name master
+}
+
+if [ "$op" = "pull" ]; then
+    remote_add_and_fetch
+    git subtree pull --prefix $path $remote_name "$ref" --squash -m "$merge_commit_msg"
+elif [ "$op" = "pick" ]; then
+    remote_add_and_fetch
+    git cherry-pick -x --strategy=subtree -Xsubtree=$path/ "$ref"
+else
+    print_usage
+    exit 1
+fi