proot permission denied

[nathaneltitane]

Problem description
when trying to chroot/proot in a directory other than the Termux environment (ex.: internal memory directory or external sdcard) proot operation fails witha permission denied on --link2symlink.

Steps to reproduce
termux-setup-storage
cd storage/shared
wget https://raw.githubusercontent.com/Neo-Oli/termux-ubuntu/master/ubuntu.sh
bash ubuntu.sh

Expected behavior
completion of script without errors or failure as expected under termux home env.

Additional information
Post output of command termux-info.

Updatable packages:
All packages up to date
Subscribed repositories:
https://dl.bintray.com/grimler/science-packages-24 science/stable
https://dl.bintray.com/grimler/game-packages-24 games/stable
https://dl.bintray.com/termux/termux-packages-24 stable/main
System information:
Linux localhost 4.14.78-16507756 #2 SMP PREEMPT Mon Sep 16 12:41:12 KST 2019 aarch64 Android
Termux-packages arch:
aarch64
Android version:
9
Device manufacturer:
samsung
Device model:
SM-G975W

If you are rooted or have access to adb then capture a logcat with logcat -d "*:W", from a adb or root shell.

NO ROOT

[ghost]

Shared storage (sdcard) doesn't support symlinks or executable permission.

[ghost]

There some work done for sdcard noexec workaround, but not released. Related issue - termux/proot#50.