proot.sh

#!/usr/bin/env bash
export ROOT=$(pwd)
export SDKROOT=${ROOT}/python-wasm-sdk
export PATH=$(pwd):$PATH
export WORKDIR=/data/git/python-wasm-sdk
export CONTAINER_PATH=${CONTAINER_PATH:-/tmp/fs}
export HOME=/tmp

if mkdir -p $CONTAINER_PATH
then
    pushd $CONTAINER_PATH
    touch alpine
    mkdir -p etc
    # use host name resolver
    cp /etc/resolv.conf etc/

    # to do some apk add and start build automatically
    cat ${ROOT}/functions ${ROOT}/Dockerfile > initrc

    # set a nice name for release tarball
    cat > etc/lsb-release <<END
LSB_VERSION=lsb-3.1-amd64:lsb-3.1-noarch
DISTRIB_ID=alpine
DISTRIB_RELEASE=3.21
DISTRIB_CODENAME=alpine
DISTRIB_DESCRIPTION="alpine"
END
    tar xfp ${ROOT}/lib64.tar.bz2
    popd
fi




# alpine-proot - A well quick standalone Alpine PRoot installer & launcher
# https://github.com/Yonle/alpine-proot

[ $(uname -s) != "Linux" ] && [ ! "$ALPINEPROOT_FORCE" ] && exec echo "Expected Linux kernel, But got unsupported kernel ($(uname -s))."

[ "$ALPINEPROOT_FORCE" ] && echo "Warning: I'm sure you know what are you doing."

# Do not run if user run this script as root
[ $(id -u) = 0 ] && [ ! "$ALPINEPROOT_FORCE" ] && echo "Running alpine-proot as root is dangerous and can harm one of your system component. Because of that, I'm aborting now. You may set ALPINEPROOT_FORCE variable as 1 if you want to continue." && exit 6

[ ! $HOME ] && export HOME=/home
[ ! $PREFIX ] && [ -x /usr ] && [ -d /usr ] && export PREFIX=/usr
[ ! $TMPDIR ] && export TMPDIR=/tmp
[ ! $CONTAINER_PATH ] && export CONTAINER_PATH="$HOME/.alpinelinux_container"

export CONTAINER_DOWNLOAD_URL=""

alpineproot() {

	if [ -x $CONTAINER_PATH/bin/busybox ]; then
		__start $@
		exit
	fi

	# Check whenever proot is installed or no
	if [ -z "$PROOT" ] || [ ! -x $PROOT ]; then
		[ "$(uname -o)" = "Android" ] && pkg=$(command -v pkg) && pkg install proot -y && alpineproot $@ && exit 0
		echo "PRoot / PRoot-rs is required in order to execute this script."
		echo "More information can go to https://proot-me.github.io"
		exit 6
	fi

	if [ -z $(command -v gzip) ] || [ ! -x $(command -v gzip) ]; then
		echo "gzip is required in order to extract Alpine rootfs."
		echo "More information can go to https://www.gnu.org/software/gzip/"
		exit 6
	fi

	# Install / Reinstall if container directory is unavailable or empty.
	if [ ! -x $CONTAINER_PATH/bin/busybox ]; then
		# Download rootfs if there's no rootfs download cache.
		if [ ! -f $HOME/.cached_rootfs.tar.gz ]; then
			if [ ! -x $(command -v curl) ]; then
				[ "$(uname -o)" = "Android" ] && pkg=$(command -v pkg) && pkg install curl -y && alpineproot $@ && exit 0
				echo "libcurl is required in order to download rootfs manually"
				echo "More information can go to https://curl.se/libcurl"
				exit 6
			fi

			[ -z $CONTAINER_DOWNLOAD_URL ] && __get_container_url

			curl -fSL#o $HOME/.cached_rootfs.tar.gz $CONTAINER_DOWNLOAD_URL
			if [ $? != 0 ]; then exit $?; fi
		fi

		[ ! -d $CONTAINER_PATH ] && mkdir -p $CONTAINER_PATH

		# Use proot to prevent hard link extraction error
		# $PROOT $HOME/.cached_rootfs.tar.gz -C $CONTAINER_PATH
        tar -xzf $HOME/.cached_rootfs.tar.gz -C $CONTAINER_PATH

		# If extraction fail, Delete cached rootfs and try again
		[ "$?" != "0" ] && rm -f $HOME/.cached_rootfs.tar.gz && alpineproot $@ && exit 0

		echo -e "nameserver 8.8.8.8\nnameserver 8.8.4.4" >$CONTAINER_PATH/etc/resolv.conf
	fi

	__start $@
}

__get_container_url() {
	CURRENT_VERSION=`curl -fsSL https://alpinelinux.org/downloads/ | grep -oP '(?<=<strong>)[^<]+(?=</strong>)'`
	[ "$?" != "0" ] && exit $?

	CURRENT_VERSION_ID=`echo $CURRENT_VERSION | grep -oE '^[0-9]+\.[0-9]+'`

	echo "The following Alpine Linux version will be installed:"
	echo ""
	echo "Current Version: ${CURRENT_VERSION}"
	echo "Version ID: ${CURRENT_VERSION_ID}"
	echo ""

	CONTAINER_DOWNLOAD_URL="https://dl-cdn.alpinelinux.org/alpine/v${CURRENT_VERSION_ID}/releases/$(uname -m)/alpine-minirootfs-${CURRENT_VERSION}-$(uname -m).tar.gz"
}

__start() {
	proot -0 rm -rf $CONTAINER_PATH/proc
	mkdir $CONTAINER_PATH/proc

	# Proceed make fake /proc/version
	echo "Linux version ${ALPINEPROOT_KERNEL_RELEASE:-6.0.0+} (root@localhost) #1 SMP Fri Jul 23 12:00:00 PDT 2021" >$CONTAINER_PATH/proc/.version

	# Proceed make fake /proc/stat
	[ ! -r /proc/stat ] && cat <<-EOM >$CONTAINER_PATH/proc/.stat
		cpu  5742 0 3915 205916 1204 0 339 82 0 0
		cpu0 1428 0 904 51706 126 0 108 21 0 0
		cpu1 1455 0 846 51772 99 0 87 20 0 0
		cpu2 1235 0 864 52026 102 0 65 19 0 0
		cpu3 1622 0 1300 50410 876 0 77 21 0 0
		intr 1181516 235 9 0 0 1703 0 241 0 0 0 542 0 3 0 0 0 0 0 0 0 0 0 0 0 0 5 0 0 1 26315 0 641 571 691 623 674 581 961 599 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
		ctxt 199763
		btime 1629638266
		processes 1
		procs_running 1
		procs_blocked 0
		softirq 562902 0 237872 366 6862 26279 0 9 122617 0 168897
	EOM

	# Proceed make fake /proc/uptime
	[ ! -r /proc/uptime ] && echo "1302.49 5018.43" >$CONTAINER_PATH/proc/.uptime

	# Proceed make fake /proc/loadavg
	[ ! -r /proc/loadavg ] && echo "0.54 0.22 0.13 1/461 650" >$CONTAINER_PATH/proc/.loadavg

	# Proceed make fake /proc/vmstat
	[ ! -r /proc/vmstat ] && cat <<-EOM >$CONTAINER_PATH/proc/.vmstat
		nr_free_pages 3621122
		nr_zone_inactive_anon 13457
		nr_zone_active_anon 93331
		nr_zone_inactive_file 180805
		nr_zone_active_file 116706
		nr_zone_unevictable 0
		nr_zone_write_pending 273
		nr_mlock 0
		nr_page_table_pages 1560
		nr_kernel_stack 7424
		nr_bounce 0
		nr_zspages 1385
		nr_free_cma 0
		numa_hit 9934918
		numa_miss 0
		numa_foreign 0
		numa_interleave 2111
		numa_local 9934918
		numa_other 0
		nr_inactive_anon 13457
		nr_active_anon 93331
		nr_inactive_file 180805
		nr_active_file 116706
		nr_unevictable 0
		nr_slab_reclaimable 37930
		nr_slab_unreclaimable 15580
		nr_isolated_anon 0
		nr_isolated_file 0
		workingset_nodes 73
		workingset_refault 1285
		workingset_activate 460
		workingset_restore 423
		workingset_nodereclaim 0
		nr_anon_pages 112449
		nr_mapped 87383
		nr_file_pages 291852
		nr_dirty 273
		nr_writeback 0
		nr_writeback_temp 0
		nr_shmem 286
		nr_shmem_hugepages 0
		nr_shmem_pmdmapped 0
		nr_file_hugepages 0
		nr_file_pmdmapped 0
		nr_anon_transparent_hugepages 1
		nr_unstable 0
		nr_vmscan_write 4383
		nr_vmscan_immediate_reclaim 0
		nr_dirtied 45538
		nr_written 48611
		nr_kernel_misc_reclaimable 0
		nr_dirty_threshold 775081
		nr_dirty_background_threshold 387067
		pgpgin 1116233
		pgpgout 217429
		pswpin 1
		pswpout 4383
		pgalloc_dma 0
		pgalloc_dma32 0
		pgalloc_normal 10007308
		pgalloc_movable 0
		allocstall_dma 0
		allocstall_dma32 0
		allocstall_normal 0
		allocstall_movable 0
		pgskip_dma 0
		pgskip_dma32 0
		pgskip_normal 0
		pgskip_movable 0
		pgfree 13629652
		pgactivate 92685
		pgdeactivate 23439
		pglazyfree 8319
		pgfault 10640127
		pgmajfault 6033
		pglazyfreed 0
		pgrefill 25344
		pgsteal_kswapd 0
		pgsteal_direct 0
		pgscan_kswapd 0
		pgscan_direct 0
		pgscan_direct_throttle 0
		zone_reclaim_failed 0
		pginodesteal 819
		slabs_scanned 44091
		kswapd_inodesteal 0
		kswapd_low_wmark_hit_quickly 0
		kswapd_high_wmark_hit_quickly 0
		pageoutrun 0
		pgrotated 3
		drop_pagecache 0
		drop_slab 0
		oom_kill 0
		pgmigrate_success 0
		pgmigrate_fail 0
		compact_migrate_scanned 0
		compact_free_scanned 0
		compact_isolated 0
		compact_stall 0
		compact_fail 0
		compact_success 0
		compact_daemon_wake 0
		compact_daemon_migrate_scanned 0
		compact_daemon_free_scanned 0
		htlb_buddy_alloc_success 0
		htlb_buddy_alloc_fail 0
		unevictable_pgs_culled 0
		unevictable_pgs_scanned 0
		unevictable_pgs_rescued 0
		unevictable_pgs_mlocked 0
		unevictable_pgs_munlocked 0
		unevictable_pgs_cleared 0
		unevictable_pgs_stranded 0
		thp_fault_alloc 0
		thp_fault_fallback 0
		thp_collapse_alloc 1
		thp_collapse_alloc_failed 0
		thp_file_alloc 0
		thp_file_mapped 0
		thp_split_page 0
		thp_split_page_failed 0
		thp_deferred_split_page 0
		thp_split_pmd 0
		thp_split_pud 0
		thp_zero_page_alloc 0
		thp_zero_page_alloc_failed 0
		thp_swpout 0
		thp_swpout_fallback 0
		balloon_inflate 0
		balloon_deflate 0
		balloon_migrate 0
		swap_ra 0
		swap_ra_hit 0
	EOM

	if [ "$(uname -o)" = "Android" ]; then unset LD_PRELOAD; fi

	COMMANDS=$PROOT
#	COMMANDS+=" --link2symlink"
	COMMANDS+=" --kill-on-exit"
	COMMANDS+=" --kernel-release=\"${ALPINEPROOT_KERNEL_RELEASE:-5.18}\""
	COMMANDS+=" -b /dev -b /proc -b /sys"
	COMMANDS+=" -b /proc/self/fd:/dev/fd"
	COMMANDS+=" -b /proc/self/fd/0:/dev/stdin"
	COMMANDS+=" -b /proc/self/fd/1:/dev/stdout"
	COMMANDS+=" -b /proc/self/fd/2:/dev/stderr"
    COMMANDS+=" -b ${SDKROOT}:${WORKDIR}"
	for f in stat version loadavg vmstat uptime; do
		[ -f "$CONTAINER_PATH/proc/.$f" ] && COMMANDS+=" -b $CONTAINER_PATH/proc/.$f:/proc/$f"
	done
	COMMANDS+=" -r $CONTAINER_PATH -0 -w /root"
	COMMANDS+=" -b $CONTAINER_PATH/root:/dev/shm"

	# Detect whenever Pulseaudio is installed with POSIX support
	if pulseaudio=$(command -v pulseaudio) && [ ! -S $PREFIX/var/run/pulse/native ]; then
		if [ -z "$ALPINEPROOT_NO_PULSE" ]; then
			! $pulseaudio --check && $pulseaudio --start --exit-idle-time=-1

			[ $? = 0 ] && [ -S "$(echo $TMPDIR/pulse-*/native)" ] && COMMANDS+=" -b $(echo $TMPDIR/pulse-*/native):/var/run/pulse/native"
		fi
	else
		if [ -z "$ALPINEPROOT_NO_PULSE" ]; then
			[ -S $PREFIX/var/run/pulse/native ] && COMMANDS+=" -b $PREFIX/var/run/pulse/native:/var/run/pulse/native"
		fi
	fi

	[ -n "$ALPINEPROOT_PROOT_OPTIONS" ] && COMMANDS+=" $ALPINEPROOT_PROOT_OPTIONS"

	# Detect whenever ALPINEPROOT_BIND_TMPDIR is available or no.
	[ -n "$ALPINEPROOT_BIND_TMPDIR" ] && COMMANDS+=" -b $TMPDIR:/tmp"

	if [ "$#" = 0 ]; then
		eval "exec $COMMANDS /bin/su -l"
	else
		eval "exec $COMMANDS /bin/su -l -c \"$@\""
	fi
}

#export PROOT=$(pwd)/proot-rs
#export ALPINEPROOT_USE_PROOT_RS=true
export PROOT=$(pwd)/proot

if ${CI:-false}
then
    echo "setting up python"
    mkdir -p $CONTAINER_PATH/opt/python-wasm-sdk/src
    wget https://www.python.org/ftp/python/3.13.1/Python-3.13.1.tar.xz -O/tmp/python.tar.xz
    tar xfp /tmp/python.tar.xz -C $CONTAINER_PATH/opt/python-wasm-sdk/src

    pushd $CONTAINER_PATH/opt/python-wasm-sdk
        git clone --no-tags --depth 1 --single-branch --branch main https://github.com/emscripten-core/emsdk.git
        pushd emsdk
            #git checkout 91f8563a9d1a4a0ec03bbb2be23485367d85a091
            ./emsdk install ${EMFLAVOUR:-latest}
            ./emsdk activate ${EMFLAVOUR:-latest}
        popd

    popd

    # prevent erasing
    touch $CONTAINER_PATH/opt/python-wasm-sdk/dev

    alpineproot "apk add bash;/bin/bash /initrc"
else
	export PROOT=$(pwd)/proot
    alpineproot "apk add bash;/bin/bash --init-file /initrc"
fi