コミット時にclang formatでc,hファイルをコンテナ内でフォーマット

Makefile

@@ -1,4 +1,9 @@
-all:
+HOOKS_DIR := hooks
+GIT_HOOKS_DIR := .git/hooks
+HOOKS := $(shell find $(HOOKS_DIR) -type f)
+GIT_HOOKS := $(HOOKS:$(HOOKS_DIR)%=$(GIT_HOOKS_DIR)%)
+
+all: $(GIT_HOOKS)
 	docker compose up --build
 
 down:
@@ -12,4 +17,7 @@ backend-it:
 
 re: down all
 
+$(GIT_HOOKS_DIR)/%: $(HOOKS_DIR)/%
+	cp $< $@
+
 .PHONY: all down re frontend-it backend-it

hooks/Dockerfile_clang-format

@@ -0,0 +1,22 @@
+FROM alpine:3.17.1 as build
+
+RUN apk add --no-cache clang-extra-tools
+
+
+FROM alpine:3.17.1
+
+WORKDIR /workdir
+
+RUN apk add --no-cache \
+  clang15-libclang \
+  clang15-libs \
+  libgcc \
+  libstdc++ \
+  libxml2 \
+  llvm15-libs \
+  musl
+
+COPY --from=build /usr/bin/clang-format /usr/bin/clang-format
+
+ENTRYPOINT [ "clang-format" ]
+CMD [ "--help" ]

hooks/pre-commit

@@ -0,0 +1,36 @@
+#!/bin/bash
+set -ue
+
+# FIXME: frontのpre-commitを追加したとき衝突しそう
+
+## == clang-format ==
+target=`git diff --staged --name-only | grep -E ".+\.(c|h)"` || :
+if [ -z $target ]; then
+  echo -e "\033[35mno target file\033[m"
+  exit 0
+fi
+
+echo -e "\033[34mclang-format target:" $target "\033[m"
+
+# imageがないときbuildする
+image=de-clang-format
+if [ -z `docker images -q $image` ]; then
+  docker build -t $image -f hooks/Dockerfile_clang-format .
+fi
+
+docker run \
+  --rm \
+  -v "$(pwd):/workdir" \
+  -w /workdir \
+  --user "$(id -u):$(id -g)" \
+  $image \
+  -i $target
+
+git add $target
+
+if [ -z `git diff --staged --name-only`]; then
+  echo -e "\033[35mno staging file\033[m"
+  exit 1
+fi
+
+echo -e "\033[32mpre-commit format is finished\033[m"