install-ubuntu20.sh

#!/data/data/com.termux/files/usr/bin/bash
pkg install wget -y
folder=ubuntu20-fs
cur=`pwd`
if [ -d "$folder" ]; then
	first=1
	echo "skipping downloading"
fi
tarball="ubuntu20-rootfs.tar.gz"

termux-setup-storage

if [ "$first" != 1 ];then
	if [ ! -f $tarball ]; then
		echo "Download Rootfs, this may take a while base on your internet speed."
		case `dpkg --print-architecture` in
		aarch64)
			archurl="arm64" ;;
		arm)
			archurl="armhf" ;;
		amd64)
			archurl="amd64" ;;
		x86_64)
			archurl="amd64" ;;
		*)
			echo "unknown architecture"; exit 1 ;;
		esac
		wget "https://github.com/AndronixApp/AndronixOrigin/raw/master/Rootfs/Ubuntu20/focal-${archurl}.tar.gz" -O $tarball
	fi

	mkdir -p "$folder"
	cd "$folder"
	echo "Decompressing Rootfs, please be patient."
	proot --link2symlink tar -xf ${cur}/${tarball} --exclude=dev||:
	cd "$cur"
fi

mkdir -p ubuntu20-binds
mkdir -p ${folder}/proc/fakethings

if [ ! -f "${cur}/${folder}/proc/fakethings/stat" ]; then
	cat <<- EOF > "${cur}/${folder}/proc/fakethings/stat"
	cpu  5502487 1417100 4379831 62829678 354709 539972 363929 0 0 0
	cpu0 611411 171363 667442 7404799 61301 253898 205544 0 0 0
	cpu1 660993 192673 571402 7853047 39647 49434 29179 0 0 0
	cpu2 666965 186509 576296 7853110 39012 48973 26407 0 0 0
	cpu3 657630 183343 573805 7863627 38895 48768 26636 0 0 0
	cpu4 620516 161440 594973 7899146 39438 47605 26467 0 0 0
	cpu5 610849 155665 594684 7912479 40258 46870 26044 0 0 0
	cpu6 857685 92294 387182 8096756 46609 22110 12364 0 0 0
	cpu7 816434 273809 414043 7946709 49546 22311 11284 0 0 0
	intr 601715486 0 0 0 0 70612466 0 2949552 0 93228 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 12862684 625329 10382717 16209 55315 8510 0 0 0 0 11 11 13 270 192 40694 95 7 0 0 0 36850 0 0 0 0 0 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 286 6378 0 0 0 54 0 3239423 2575191 82725 0 0 127 0 0 0 1791277 850609 20 9076504 0 301 0 0 0 0 0 3834621 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 806645 0 0 0 0 0 7243 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2445850 52 1783 0 0 5091520 0 0 0 3 0 0 0 0 0 5475 0 198001 0 2 42 1289224 0 2 202483 4 0 8390 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3563336 4202122 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 1 0 1 0 0 1 0 1 0 17948 0 0 612 0 0 0 0 2103 0 0 20 0 0 0 0 0 0 0 0 0 0 0 0 0 10 0 0 0 0 0 0 0 11 11 12 0 12 0 52 752 0 0 0 0 0 0 0 743 0 14 0 0 12 0 0 1863 229 0 464 0 0 0 0 0 0 8588 97 7236426 92766 622 31 0 0 0 18 4 4 0 5 0 0 116013 7 0 0 752406
	ctxt 826091808
	btime 1611513513
	processes 288493
	procs_running 1
	procs_blocked 0
	softirq 175407567 14659158 51739474 28359 5901272 8879590 0 11988166 46104015 0 36107533
	EOF
fi

if [ ! -f "${cur}/${folder}/proc/fakethings/version" ]; then
	cat <<- EOF > "${cur}/${folder}/proc/fakethings/version"
	Linux version 5.4.0-faked (andronix@fakeandroid) (gcc version 4.9.x (Andronix fake /proc/version) ) #1 SMP PREEMPT Sun Sep 13 00:00:00 IST 2020
	EOF
fi

if [ ! -f "${cur}/${folder}/proc/fakethings/vmstat" ]; then
	cat <<- EOF > "${cur}/${folder}/proc/fakethings/vmstat"
	nr_free_pages 15717
	nr_zone_inactive_anon 87325
	nr_zone_active_anon 259521
	nr_zone_inactive_file 95508
	nr_zone_active_file 57839
	nr_zone_unevictable 58867
	nr_zone_write_pending 0
	nr_mlock 58867
	nr_page_table_pages 24569
	nr_kernel_stack 49552
	nr_bounce 0
	nr_zspages 80896
	nr_free_cma 0
	nr_inactive_anon 87325
	nr_active_anon 259521
	nr_inactive_file 95508
	nr_active_file 57839
	nr_unevictable 58867
	nr_slab_reclaimable 17709
	nr_slab_unreclaimable 47418
	nr_isolated_anon 0
	nr_isolated_file 0
	workingset_refault 33002180
	workingset_activate 5498395
	workingset_restore 2354202
	workingset_nodereclaim 140006
	nr_anon_pages 344014
	nr_mapped 193745
	nr_file_pages 218441
	nr_dirty 0
	nr_writeback 0
	nr_writeback_temp 0
	nr_shmem 1880
	nr_shmem_hugepages 0
	nr_shmem_pmdmapped 0
	nr_anon_transparent_hugepages 0
	nr_unstable 0
	nr_vmscan_write 8904094
	nr_vmscan_immediate_reclaim 139732
	nr_dirtied 8470080
	nr_written 16835370
	nr_indirectly_reclaimable 8273152
	nr_unreclaimable_pages 130861
	nr_dirty_threshold 31217
	nr_dirty_background_threshold 15589
	pgpgin 198399484
	pgpgout 31742368
	pgpgoutclean 45542744
	pswpin 3843200
	pswpout 8903884
	pgalloc_dma 192884869
	pgalloc_normal 190990320
	pgalloc_movable 0
	allocstall_dma 0
	allocstall_normal 3197
	allocstall_movable 1493
	pgskip_dma 0
	pgskip_normal 0
	pgskip_movable 0
	pgfree 384653565
	pgactivate 34249517
	pgdeactivate 44271435
	pglazyfree 192
	pgfault 46133667
	pgmajfault 5568301
	pglazyfreed 0
	pgrefill 55909145
	pgsteal_kswapd 58467386
	pgsteal_direct 255950
	pgscan_kswapd 86628315
	pgscan_direct 415889
	pgscan_direct_throttle 0
	pginodesteal 18
	slabs_scanned 31242197
	kswapd_inodesteal 1238474
	kswapd_low_wmark_hit_quickly 11637
	kswapd_high_wmark_hit_quickly 5411
	pageoutrun 32167
	pgrotated 213328
	drop_pagecache 0
	drop_slab 0
	oom_kill 0
	pgmigrate_success 729722
	pgmigrate_fail 450
	compact_migrate_scanned 43510584
	compact_free_scanned 248175096
	compact_isolated 1494774
	compact_stall 6
	compact_fail 3
	compact_success 3
	compact_daemon_wake 9438
	compact_daemon_migrate_scanned 43502436
	compact_daemon_free_scanned 248107303
	unevictable_pgs_culled 66418
	unevictable_pgs_scanned 0
	unevictable_pgs_rescued 8484
	unevictable_pgs_mlocked 78830
	unevictable_pgs_munlocked 8508
	unevictable_pgs_cleared 11455
	unevictable_pgs_stranded 11455
	swap_ra 0
	swap_ra_hit 7
	speculative_pgfault 221449963
	EOF
fi

echo "Seeking for external storage (SD cards or USB hard drives)..."
EXTERNAL_FOLDER=$(find /storage -maxdepth 1 -type d | grep -E "/storage/[A-Za-z0-9]{8}-[A-Za-z0-9]{4}-[A-Za-z0-9]{4}-[A-Za-z0-9]{4}-[A-Za-z0-9]{12}$")
SEARCH_METHOD="UUID mechanism"

if [ -z "$EXTERNAL_FOLDER" ]
then
  EXTERNAL_FOLDER=$(find /storage -maxdepth 1 -type d | grep -E "/storage/[A-Za-z0-9]{4}-[A-Za-z0-9]{4}$")
  SEARCH_METHOD="Shorter UID (for FAT, exFAT and NTFS filesystems that do not support UUID)"
fi

if [ -z "$EXTERNAL_FOLDER" ]
then
  EXTERNAL_FOLDER=$(mount | grep /mnt/media_rw | cut -d ' ' -f 3)
  SEARCH_METHOD="Mounting point path"
fi

if [ -z "$EXTERNAL_FOLDER" ]
then
    echo "The external drive is not where it was intended to be."
    echo "Seeking for external drive on the whole system. Be sure to have a file named \"external-hook\" in your drive. Operation can take few minutes..."
    EXTERNAL_FOLDER=$(find / -type f -name "external-hook" 2>/dev/null | sed 's@/external-hook@@g')
    SEARCH_METHOD="Searching for \"external-hook\" file in whole system"
fi

if [ -z "$EXTERNAL_FOLDER" ]
then
    echo "Can't find external drive."
    exit 1
else
    echo "External drive searching method: $SEARCH_METHOD"
    echo "External drive path: $EXTERNAL_FOLDER"
fi
sleep 5

bin=start-ubuntu20.sh
echo "Writing launch script"
cat > $bin <<- EOM
#!/bin/bash
cd \$(dirname \$0)
## unset LD_PRELOAD in case termux-exec is installed
unset LD_PRELOAD
command="proot"
command+=" --kill-on-exit"
command+=" --link2symlink"
command+=" -0"
command+=" -r $folder"
if [ -n "\$(ls -A ubuntu20-binds)" ]; then
    for f in ubuntu20-binds/* ;do
      . \$f
    done
fi
command+=" -b /dev"
command+=" -b /proc"
command+=" -b /sys"
command+=" -b /data"
command+=" -b ubuntu20-fs/root:/dev/shm"
command+=" -b /proc/self/fd/2:/dev/stderr"
command+=" -b /proc/self/fd/1:/dev/stdout"
command+=" -b /proc/self/fd/0:/dev/stdin"
command+=" -b /dev/urandom:/dev/random"
command+=" -b /proc/self/fd:/dev/fd"
command+=" -b ${cur}/${folder}/proc/fakethings/stat:/proc/stat"
command+=" -b ${cur}/${folder}/proc/fakethings/vmstat:/proc/vmstat"
command+=" -b ${cur}/${folder}/proc/fakethings/version:/proc/version"
## uncomment the following line to have access to the home directory of termux
#command+=" -b /data/data/com.termux/files/home:/root"
command+=" -b ${EXTERNAL_FOLDER}:/external-storage"
command+=" -w /root"
command+=" /usr/bin/env -i"
command+=" MOZ_FAKE_NO_SANDBOX=1"
command+=" HOME=/root"
command+=" PATH=/usr/local/sbin:/usr/local/bin:/bin:/usr/bin:/sbin:/usr/sbin:/usr/games:/usr/local/games"
command+=" TERM=\$TERM"
command+=" LANG=C.UTF-8"
command+=" /bin/bash --login"
com="\$@"
if [ -z "\$1" ];then
    exec \$command
else
    \$command -c "\$com"
fi
EOM

mkdir -p ubuntu20-fs/var/tmp
rm -rf ubuntu20-fs/usr/local/bin/*

wget -q https://raw.githubusercontent.com/AndronixApp/AndronixOrigin/master/Rootfs/Ubuntu19/.profile -O ubuntu20-fs/root/.profile.1
cat $folder/root/.profile.1 >> $folder/root/.profile && rm -rf $folder/root/.profile.1
wget -q https://raw.githubusercontent.com/AndronixApp/AndronixOrigin/master/Rootfs/Ubuntu19/vnc -P ubuntu20-fs/usr/local/bin
wget -q https://raw.githubusercontent.com/AndronixApp/AndronixOrigin/master/Rootfs/Ubuntu19/vncpasswd -P ubuntu20-fs/usr/local/bin
wget -q https://raw.githubusercontent.com/AndronixApp/AndronixOrigin/master/Rootfs/Ubuntu19/vncserver-stop -P ubuntu20-fs/usr/local/bin
wget -q https://raw.githubusercontent.com/AndronixApp/AndronixOrigin/master/Rootfs/Ubuntu19/vncserver-start -P ubuntu20-fs/usr/local/bin

chmod +x ubuntu20-fs/root/.bash_profile
chmod +x ubuntu20-fs/root/.profile
chmod +x ubuntu20-fs/usr/local/bin/vnc
chmod +x ubuntu20-fs/usr/local/bin/vncpasswd
chmod +x ubuntu20-fs/usr/local/bin/vncserver-start
chmod +x ubuntu20-fs/usr/local/bin/vncserver-stop
touch $folder/root/.hushlogin
echo "127.0.0.1 localhost localhost" > $folder/etc/hosts
echo "nameserver 1.1.1.1" > $folder/etc/resolv.conf
chmod +x $folder/etc/resolv.conf
echo "fixing shebang of $bin"
termux-fix-shebang $bin
echo "making $bin executable"
chmod +x $bin
echo "removing image for some space"
rm $tarball
clear
echo "You can now launch Ubuntu with the ./${bin} script form next time"
sudo bash $bin