makebranch.sh: add helper script for creating release branches

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

diff --git a/makebranch.sh b/makebranch.sh
new file mode 100755 (executable)
index 0000000..e8472d7
--- /dev/null
+++ b/makebranch.sh
@@ -0,0 +1,152 @@
+#!/usr/bin/env bash
+
+git_author="Release System"
+git_email="lede-dev@lists.infradead.org"
+
+base_url="http://downloads.openwrt.org/releases"
+
+[ -f "./feeds.conf.default" ] || {
+       echo "Please execute as ./${0##*/}" >&2
+       exit 1
+}
+
+usage() {
+       {
+               echo ""
+               echo "Usage: $0 [-i] [-a <Git author>] [-e <Git email>] \\"
+               echo "          [-u <Download base url>] [-n <codename>] -v <version>"
+               echo ""
+               echo "-i"
+               echo "Exit successfully if branch already exists"
+               echo ""
+               echo "-a Git author [$git_author]"
+               echo "Override the author name used for automated Git commits"
+               echo ""
+               echo "-e Git email [$git_email]"
+               echo "Override the email used for automated Git commits"
+               echo ""
+               echo "-u Download base url [$base_url]"
+               echo "Use the given URL as base for download repositories"
+               echo ""
+               exit 1
+       } >&2
+}
+
+while getopts "a:e:iu:n:v:" opt; do
+       case "$opt" in
+               a) git_author="$OPTARG" ;;
+               e) git_email="$OPTARG" ;;
+               i) ignore_existing=1 ;;
+               u) base_url="${OPTARG%/}" ;;
+               n) codename="$OPTARG" ;;
+               v)
+                       case "$OPTARG" in
+                               [0-9]*.[0-9]*)
+                                       version="$(echo "$OPTARG" | cut -d. -f1-2)"
+                               ;;
+                               *)
+                                       echo "Unexpected version format: $OPTARG" >&2
+                                       exit 1
+                               ;;
+                       esac
+               ;;
+               \?)
+                       echo "Unexpected option: -$OPTARG" >&2
+                       usage
+               ;;
+               :)
+                       echo "Missing argument for option: -$OPTARG" >&2
+                       usage
+               ;;
+       esac
+done
+
+[ -n "$version" ] || usage
+
+revnum="$(./scripts/getver.sh)"
+githash="$(git log --format=%h -1)"
+
+prev_branch="$(git symbolic-ref -q HEAD)"
+
+if [ "$prev_branch" != "refs/heads/master" ]; then
+       echo "Expecting current branch name to be \"master\"," \
+            "but it is \"${prev_branch#refs/heads/}\" - aborting."
+
+       exit 1
+fi
+
+distname="$(sed -ne '/config VERSION_DIST/ { :next; n; s/^[[:space:]]*default "\(.*\)"/\1/p; T next }' \
+       package/base-files/image-config.in)"
+
+distname="${distname:-OpenWrt}"
+distname_lc="$(echo "$distname" | tr 'A-Z' 'a-z')"
+
+if git rev-parse "${distname_lc}-${version}^{tree}" >/dev/null 2>/dev/null; then
+       if [ -z "$ignore_existing" ]; then
+               echo "Branch ${distname_lc}-${version} already exists!" >&2
+               exit 1
+       fi
+
+       exit 0
+fi
+
+if grep -sq 'RELEASE:=' include/version.mk && [ -z "$codename" ]; then
+       echo "A codename is required for this ${distname} version!" >&2
+       exit 1
+fi
+
+export GIT_AUTHOR_NAME="$git_author"
+export GIT_AUTHOR_EMAIL="$git_email"
+export GIT_COMMITTER_NAME="$git_author"
+export GIT_COMMITTER_EMAIL="$git_email"
+
+git checkout -b "${distname_lc}-$version"
+
+while read type name url; do
+       case "$type" in
+               src-git)
+                       case "$url" in
+                               *^*|*\;*) : ;;
+                               *)
+                                       ref="$(git ls-remote "$url" "${distname_lc}-$version")"
+
+                                       if [ -z "$ref" ]; then
+                                               echo "WARNING: Feed \"$name\" provides no" \
+                                                    "\"${distname_lc}-$version\" branch - using master!" >&2
+                                       else
+                                               url="$url;${distname_lc}-$version"
+                                       fi
+                               ;;
+                       esac
+                       echo "$type $name $url"
+               ;;
+               src-*)
+                       echo "$type $name $url"
+               ;;
+       esac
+done < feeds.conf.default > feeds.conf.branch && \
+       mv feeds.conf.branch feeds.conf.default
+
+sed -e 's!^RELEASE:=.*!RELEASE:='"$codename"'!g' \
+    -e 's!\(VERSION_NUMBER:=\$(if .*\),[^,]*)!\1,'"$version-SNAPSHOT"')!g' \
+    -e 's!\(VERSION_REPO:=\$(if .*\),[^,]*)!\1,'"$base_url/$version-SNAPSHOT"')!g' \
+       include/version.mk > include/version.branch && \
+               mv include/version.branch include/version.mk
+
+sed -e 's!http://downloads.\(openwrt\|lede-project\).org/[^"]*!'"$base_url/$version-SNAPSHOT"'!g' \
+       package/base-files/image-config.in > package/base-files/image-config.branch && \
+               mv package/base-files/image-config.branch package/base-files/image-config.in
+
+git commit -sm "${distname:-OpenWrt} v$version: set branch defaults" \
+       feeds.conf.default \
+       include/version.mk \
+       package/base-files/image-config.in
+
+git --no-pager log -p -1
+git checkout "${prev_branch#refs/heads/}"
+
+cat <<EOT
+# Push the branch with:
+git push origin "refs/heads/${distname_lc}-$version:refs/heads/${distname_lc}-$version"
+EOT
+