installInProotDistro.sh

#!/usr/bin/env bash

yes | rm /data/data/com.termux/files/usr/var/lib/proot-distro/installed-rootfs/small -r

echo '##
## Plug-in for installing small
##

DISTRO_NAME="small https://github.com/stringmanolo/small"

# You can override a CPU architecture to let distribution
# be executed by QEMU (user-mode).
#
# You can specify the following values here:
#
#  * aarch64: AArch64 (ARM64, 64bit ARM)
#  * armv7l:  ARM (32bit)
#  * i686:    x86 (32bit)
#  * x86_64:  x86 (64bit)
#
# Default value is set by proot-distro script and is equal
# to the CPU architecture of your device (uname -m).
#DISTRO_ARCH=$(uname -m)

# Returns download URL and SHA-256 of file in this format:
# SHA-256|FILE-NAME
get_download_url() {
        local rootfs
        local sha256

        case "$DISTRO_ARCH" in
                aarch64)
                        rootfs="https://github.com/termux/proot-distro/releases/download/v1.2-alpine-rootfs/alpine-minirootfs-3.13.1-aarch64.tar.gz"
                        sha256="0e8258cc599a86be428228dd5ea9217959f2c77873790bec645c05899f252c5e"
                        ;;
                armv7l|armv8l)
                        rootfs="https://github.com/termux/proot-distro/releases/download/v1.2-alpine-rootfs/alpine-minirootfs-3.13.1-armv7.tar.gz"
                        sha256="71bedb0810b656377192f4a239126f452a016d7a33e28f8ad8f46e9b0e7d8028"
                        ;;
                i686)
                        rootfs="https://github.com/termux/proot-distro/releases/download/v1.2-alpine-rootfs/alpine-minirootfs-3.13.1-x86.tar.gz"
                        sha256="6884df8f8e44d462a9723e412f0b76124019683d98afe448a8767dc5f5f3a7e0"
                        ;;
                x86_64)
                        rootfs="https://github.com/termux/proot-distro/releases/download/v1.2-alpine-rootfs/alpine-minirootfs-3.13.1-x86_64.tar.gz"
                        sha256="1ab0a7c05107c4504018be170d937c07e35283b7a3f153886c8c93162dfbf4af"
                        ;;
        esac

        echo "${sha256}|${rootfs}"
}

# Define here additional steps which should be executed
# for configuration.
distro_setup() {
        # Hint: $PWD is the distribution rootfs directory.
        #echo "hello world" > ./etc/motd

        # Run command within proot'"'"'ed environment with
        # run_proot_cmd function.
        # Uncomment this to run '"'"'apk upgrade'"'"' during installation.
        #run_proot_cmd apk upgrade
        :
}

' > /data/data/com.termux/files/usr/etc/proot-distro/small.sh

proot-distro remove small;

proot-distro install small;

yes | rm /data/data/com.termux/files/usr/var/lib/proot-distro/installed-rootfs/small -r

cp smallFileSystem /data/data/com.termux/files/usr/var/lib/proot-distro/installed-rootfs/small -r;

# SMALL_COMMAND IS CHECKED INSIDE SHELL TO DECIDE IF TO PRINT MOTD OR NOT 
echo '#!/usr/bin/env bash

if [[ "$1" ]]; then
 touch /data/data/com.termux/files/usr/var/lib/proot-distro/installed-rootfs/small/tmp/.small_command_1;
 proot-distro login small --isolated --fix-low-ports -- /bin/"$@"
 rm /data/data/com.termux/files/usr/var/lib/proot-distro/installed-rootfs/small/tmp/.small_command_1;
else
  clear;
  proot-distro login small --isolated --fix-low-ports
fi
' > "$HOME"/../usr/bin/small;

chmod +775 "$HOME"/../usr/bin/small;

echo 'System Ready:

$ small
'