Add example container build setup

cobuild/000-setup.sh

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+progress "Installing matfyz-help discord bot"
+
+install-pkgs python3-venv
+
+# Do stuff??

cobuild/Dockerfile.top

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+ FROM docker://registry.ks.matfyz.cz/gimli/base:bookworm 

cobuild/try

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+ #!/bin/bash
+set -e
+common/build cobuild --tag matfyz-help-bot-test
+podman rm -if matfyz-help-bot-test
+podman create --name matfyz-help-bot-test --hostname matfyz-help-bot-test matfyz-help-bot-test
+podman start matfyz-help-bot-test

common/build

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+#!/usr/bin/env bash
+set -euo pipefail
+
+gen-init ()
+{
+	echo "COPY common /build/common"
+}
+
+gen-cleanup ()
+{
+	echo "RUN rm -rf /build /data"
+}
+
+gen-docker-file ()
+{
+	if [ -f $src/Dockerfile.top ] ; then
+		cat $src/Dockerfile.top
+		gen-init
+	fi
+
+	for stage in $(cd $src && echo [0-9]*.[a-z]*) ; do
+		case $stage in
+			*.docker)
+				cat $src/$stage
+				if grep -wq '^FROM' $src/$stage ; then
+					gen-init
+				fi
+				;;
+			*.d|*.sh)
+				echo "COPY $src/$stage /build/$stage"
+				echo "RUN /build/common/run $stage"
+				;;
+			*)
+				echo >&2 "ERROR: Unrecognized build stage name $stage"
+				exit 1
+				;;
+		esac
+	done
+
+	if [ -f $src/Dockerfile.bottom ] ; then
+		cat $src/Dockerfile.bottom
+	fi
+
+	gen-cleanup
+}
+
+if [ $# = 0 ] ; then
+	echo >&2 "Usage: $0 <src-directory> [<podman build options>]"
+	exit 1
+fi
+
+src=$1
+shift
+
+if [ ! -v http_proxy ] ; then
+	PROXY=
+	eval "$(apt-config shell PROXY Acquire::http::proxy)"
+	if [ -n "$PROXY" ] ; then
+		export http_proxy=$PROXY
+	fi
+fi
+
+if [ -v http_proxy -a ! -v https_proxy ] ; then
+	export https_proxy=$http_proxy
+fi
+
+CACHE_DIR=${XDG_CACHE_HOME:-$HOME/.cache}/container-build
+if [ -d $CACHE_DIR ] ; then
+	echo "Using cache $CACHE_DIR"
+else
+	echo "Creating cache $CACHE_DIR"
+	mkdir -p $CACHE_DIR
+fi
+mkdir -p $CACHE_DIR/download
+
+gen-docker-file | podman build \
+	--file - \
+	--http-proxy \
+	--volume=$CACHE_DIR:/root/.cache \
+	"$@" \
+	.
+
+echo -n "Cache usage: "
+du -sh $CACHE_DIR | cut -d '	' -f1

common/lib.sh

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+C_RED="$(echo -e '\e[31m')"
+C_GREEN="$(echo -e '\e[32m')"
+C_YELLOW="$(echo -e '\e[33m')"
+C_NORMAL="$(echo -e '\e[0m')"
+
+export DEBIAN_FRONTEND=noninteractive
+B_APT_UPDATED=
+
+progress ()
+{
+	echo "${C_GREEN}$1${C_NORMAL}" >&2
+}
+
+note ()
+{
+	echo "${C_YELLOW}$1${C_NORMAL}" >&2
+}
+
+warn ()
+{
+	echo "${C_RED}WARNING: $1${C_NORMAL}" >&2
+}
+
+die ()
+{
+	echo "${C_RED}ERROR: $1${C_NORMAL}" >&2
+	exit 1
+}
+
+update-pkgs ()
+{
+	if [ -z "$B_APT_UPDATED" ] ; then
+		apt update
+		B_APT_UPDATED=1
+	fi
+}
+
+install-pkgs ()
+{
+	update-pkgs
+	apt install -y --no-install-recommends --no-install-suggests "$@"
+}
+
+install-config ()
+{
+	[ $# = 2 ] || die "Usage: install-config <source> (<target-file> | <target-dir>/)"
+	local S=$1
+	local T=$2
+	if [ ${T%/} != $T ] ; then
+		T=$T$(basename $S)
+	fi
+	local B=$BUILD_CONFIG$T
+	mkdir -p $(dirname $B) $(dirname $T)
+	if [ -f $T ] ; then
+		if [ ! -f $B.orig ] ; then
+			echo "Backing up $T to $B.orig"
+			cp $T $B.orig
+		else
+			echo "Backup of $T already present in $B.orig"
+		fi
+	fi
+	if [ -f $S ] ; then
+		# Just a new file: overwrite
+		echo "Overwriting $T"
+		cp $S $T
+		cp $S $B.new
+	elif [ -f $S.orig -a -f $S.new ] ; then
+		# Try 3-way merge
+		if cmp --quiet $S.new $T ; then
+			warn "Skipping merge of $T: changes already present"
+		else
+			echo "Merging $T"
+			if diff3 -m $S.new $S.orig $T >$B.new ; then
+				cp $B.new $T
+			else
+				die "Merge failed, please review $B.new"
+			fi
+		fi
+	else
+		die "Do not know how to install config $T"
+	fi
+}
+
+sed-config ()
+{
+	[ $# = 2 ] || die "Usage: sed-config <target> <sed-script>"
+	local T=$1
+	local SCRIPT=$2
+	local B=$BUILD_CONFIG$T
+	mkdir -p $(dirname $B)
+	[ -f $T ] || die "Want to sed $T, but it is missing"
+	if [ ! -f $B.orig ] ; then
+		echo "Backing up $T to $B.orig"
+		cp $T $B.orig
+	else
+		echo "Backup of $T already present in $B.orig"
+	fi
+	sed -ri "$SCRIPT" $T
+	cp $T $B.new
+}
+
+pipe-config ()
+{
+	[ $# = 1 ] || die "Usage: <command> | pipe-config <target>"
+	local TMP=$(mktemp)
+	cat >$TMP
+	install-config $TMP $1
+	rm $TMP
+}
+
+rm-config ()
+{
+	[ $# = 1 ] || die "Usage: rm-config <target>"
+	local T=$1
+	local B=$BUILD_CONFIG$T
+	if [ -f $T ] ; then
+		if [ ! -f $B.orig ] ; then
+			echo "Backing up $T to $B.orig"
+			cp $T $B.orig
+		fi
+		echo "Removing $T"
+		rm -f $T
+	else
+		echo "Wanted to remove $T, but it does not exist"
+	fi
+}
+
+download ()
+{
+	[ $# = 3 ] || die "Usage: download <URL> <hash-type> <hash>"
+	local URL=$1
+	local HTYPE=$2
+	local HASH=$3
+	local DEST=$(basename $URL)
+	local CACHE=/root/.cache/download
+	if [ -d $CACHE ] ; then
+		if [ -f $CACHE/$DEST ] ; then
+			echo "Using cached $DEST"
+		else
+			echo "Downloading $URL with caching"
+			curl -L $URL >$CACHE/$DEST.tmp
+			mv $CACHE/$DEST.tmp $CACHE/$DEST
+		fi
+		ln -s $CACHE/$DEST .
+	else
+		warn "Cache $CACHE not found: downloading directly"
+		echo "Downloading $URL"
+		curl $URL >$DEST
+	fi
+	local H=$(${HTYPE}sum $DEST | cut -d' ' -f1)
+	[ $H == $HASH ] || die "Mismatched hash: got $H, want $HASH"
+}

common/run

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+#!/bin/bash
+set -euo pipefail
+
+if [ $# != 1 ] ; then
+	echo >&2 "Usage: $0 <stage-directory>"
+	exit 1
+fi
+
+STAGE=$1
+
+STAGE=/build/$STAGE
+BUILD_COMMON=/build/common
+BUILD_CONFIG=/build/config-tmp
+. $BUILD_COMMON/lib.sh
+
+note "Running $STAGE"
+
+if [ ! -v http_proxy -o ! -v https_proxy ] ; then
+	warn "No HTTP(S) proxy is set"
+fi
+
+case "$STAGE" in
+	*.sh)
+		. $STAGE
+		exit 0
+		;;
+	*.d)
+		;;
+	*)
+		die "Unrecognized stage name $STAGE"
+esac
+
+cd $STAGE
+
+if [ -f run.sh ] ; then
+	. run.sh
+else
+	for a in [0-9]* ; do
+		case "$a" in
+			*.sh)
+				( . $a )
+				;;
+			*.d)
+				( cd $a && . run.sh )
+				;;
+			*)
+				warn "Unrecognized build step file $a"
+		esac
+	done
+fi