#!/bin/zsh

# giteaudpater: a little script for building Gitea from src and deploying it.
# license: gpl3-or-later
# author: wanderer at git.dotya.ml
# have fun y'all

# -e exit on error -> script "handles" this
# -u treat unset vars as errors
# -o pipefail - exit on pipefail
set -u -o pipefail

readonly bdir=/opt/gitea
readonly gdir="$bdir/gitea-src"
readonly patchdir="$bdir/patches"
readonly dateargs="--iso-8601=seconds"
readonly GOPATH="$HOME/go"
readonly PATH="$GOPATH/bin:/usr/local/bin:$PATH"

readonly gitea_orig="/usr/local/bin/gitea"
readonly gitea_backup="/usr/local/bin/.gitea_backup"
readonly gitea_nu="/usr/local/bin/.gitea-nu"

# patchpls="e9747de95242807a6319e146216575676de66f47"
# patchpls="b2b3225bd"
# patchpls="e0688995"
# patchpls="8eb1cd9264"
# patchpls="0649c54275"
# patchpls="3df33799c"
# patchpls="690272d2e24846390d785a1f053af6c7ba5963a3"
# patchpls="90b2657ae7f022f0a9fe2ba7199c60d32a36d673"
# patchpls="87a7c37ecb" # builds but coredumps... adjusted systemd CAPABILITIES and it runs fine now, probably a change in JS caused this.
# patchpls=""
readonly patchpls="${1:-}"


echo "[*] gitea updater"

gitprepare(){
	if [ -d "$gdir" ]; then
		cd "$gdir"
	else
		git clone https://github.com/wULLSnpAXbWZGYDYyhWTKKspEQoaYxXyhoisqHf/gitea.git "$gdir" \
		&& cd "$gdir" \
		&& git remote add upstream https://github.com/go-gitea/gitea.git
	fi

	git reset --hard && git clean -f -d
	git fetch --tags --prune --prune-tags --force upstream
	git checkout main
	git pull --all --tags --prune --rebase=true
	echo "[*] update submodules"
	git submodule update

	# only checkout the patched commit if set.
	if [ ! -z $patchpls ]; then
		git checkout $patchpls && git clean -f -d
	fi
}

patch_time(){
	echo -e ' -- [+] "patching" fonts'
	sed -i 's/var(--fonts-monospace/Fira Code Retina, Fira Code Retina, var(--fonts-monospace/g' $gdir/web_src/css/*.css

	readonly patchfiles="${$(bash -c "shopt -s nullglob dotglob; echo $patchdir/*.patch"):-}"
	if (( "${#patchfiles}" )); then
		echo " -- [+] applying patches..."
		git apply $patchdir/*.patch || echo "[*] failed to apply patches"
	fi
}

deploy(){
	sudo rsync --chown=root:root -avP ./gitea $gitea_nu \
	&& echo " -- backing up old binary -- @$(date $dateargs)" \
	&& sudo rsync --chown=root:root -avP $gitea_orig $gitea_backup \
	&& echo " -- stopping gitea -- @$(date $dateargs)" \
	&& sudo systemctl stop gitea \
	&& echo " -- moving new binary -- @$(date $dateargs)" \
	&& sudo mv -v $gitea_nu $gitea_orig \
	&& \
	echo " -- starting gitea.service -- @$(date $dateargs)" \
	&& sudo systemctl start gitea \
	&& \
	echo " -- waiting 5s -- @$(date $dateargs)" \
	&& sleep 5 \
	&& \
	echo " -- deploy done -- @$(date $dateargs)" \
}

rollback(){
	echo " -- gitea failed to start -- @$(date $dateargs)"
	echo " -- restart counter at '$(systemctl show gitea.service -pNRestarts | cut -d'=' -f2)'"
	echo " -- stopping gitea -- @$(date $dateargs)"
	sudo systemctl stop gitea
	echo " -- performing a naive rollback -- @$(date $dateargs)"
	sudo mv -v $gitea_backup $gitea_nu
	sudo mv -v $gitea_orig $gitea_backup
	sudo mv -v $gitea_nu $gitea_orig
	echo " -- restarting -- @$(date $dateargs)"
	sudo systemctl restart gitea
	echo " -- sleeping 5s -- @$(date $dateargs)"
	sleep 5
	echo " -- naive rollback done -- @$(date $dateargs)"
}

build_deploy(){
	# export CGO_ENABLED=0 #  cgo is needed for go-sqlite3 and possibly more
	export CGO_ENABLED=1
	# readonly pic="-fPIC" # scientific testing showed decreased performance.
	readonly pic=""
	export GOAMD64="v2"
	export LDFLAGS="-linkmode external -extldflags '-static'"
	GOLDFLAGS="-s -w -linkmode external -extldflags -static"
	export HARDENING_FLAGS="-pipe -D_FORTIFY_SOURCE=2 -fstack-protector-all -funwind-tables -fasynchronous-unwind-tables $pic -fmessage-length=0 -g0"
	export GOFLAGS="-buildmode=pie -trimpath -mod=readonly -modcacherw"
	export CGO_CFLAGS="-march=native -mtune=native -O3 -fuse-ld=lld ${HARDENING_FLAGS}"
	export CGO_CPPFLAGS="-march=native -mtune=native -O3 -fuse-ld=lld ${HARDENING_FLAGS}"
	export CGO_CXXFLAGS="$CGO_CPPFLAGS"
	export CGO_LDFLAGS="-Wl,-O2,-sort-common,-as-needed,-z,relro,-z,now,-flto,--no-gc-sections -pthread"

	echo -e " -- starting build -- @$(date $dateargs)"
	#### NO MAKE CLEAN atm
	( TAGS="netgo osusergo nogogit bindata sqlite sqlite_unlock_notify sqlite_omit_load_extension" \
	make frontend backend \
	&& \
	deploy ) \
	|| exit 1
}


gitprepare 2>&1
patch_time 2>&1
build_deploy 2>&1


failure="$(systemctl is-failed -q gitea.service; echo $?)"
restarts="$(systemctl show gitea.service -pNRestarts | cut -d'=' -f2)"
if [[ ($failure -eq 0) || ($restarts -gt 0) ]]; then
	rollback 2>&1
fi

echo " -- gitea.service status: $(systemctl is-active gitea)"