Termux-packages: Shebangs, shebangs...

Created on 19 Dec 2015 · 21Comments · Source: termux/termux-packages

Hey fellows!

It's kind of unfortunate that Termux can't execute scripts with standard shebang lines.

One option is to patch all my scripts with new shebang lines that work in Termux, but a nicer solution occurred to me: the shell(s) could be patched to automatically translate /bin and /usr/bin into Termux's bin locations.

I haven't looked into doing this yet -- just thought I'd throw the idea out there and see if there were any better ideas.

Source

epitron

Most helpful comment

Have you tried apt install proot and termux-chroot? That way you don't need sheebang changes.

tomaklutfu on 2 Oct 2016

👍3

All 21 comments

Thanks, that an interesting suggestion! Will look into how feasible it would be.

For now, one has to use the termux-fix-shebang script to manually rewrite shebang files before executing them.

fornwall on 19 Dec 2015

That doesn't work so well on all shebangs. For example #!/usr/bin/env bash
doesn't point to env after termux-fix-shebang because env is in the applets
subdirectory.

Neo-Oli on 19 Dec 2015

For example #!/usr/bin/env bash doesn't point to env after termux-fix-shebang because env is in the applets subdirectory.

The bin/applets/env is from busybox, install the full coreutils bin/env with:

apt install coreutils

With that said, it would still be great not having to run termux-fix-shebang at all and patch shells as suggested by @epitron, if possible without unreasonable complexity.

fornwall on 19 Dec 2015

apt install coreutils
Cool, thanks.

Neo-Oli on 19 Dec 2015

is making /usr/bin a symlink to /bin feasible? arch linux does this the other way (/bin --> /usr/bin)

franciscod on 21 Dec 2015

@franciscod If the device is rooted then /bin or /usr/bin should be able to be setup with symlinks.

For non-root situations I'm closing this in favour of https://github.com/termux/termux-packages/issues/111 for discussion about fakechroot/proot.

fornwall on 25 Dec 2015

This issue has been closed in favor of another closed one :)

I am a developer and I try to write a bash script as part of the software I'm developing; everything is in a git repo.

Right now, I have to make two copies of this script, and manually keep them in sync OR run termux-fix-shebang on a copy after each change to the original script.

I suggest re-opening, otherwise I don't have the necessary skills to figure it out myself, but if you already have ideas on how this could be achieved, I could try to take a look.

Thanks for this amazing project!

christianrondeau on 2 Oct 2016

👍1

Have you tried apt install proot and termux-chroot? That way you don't need sheebang changes.

tomaklutfu on 2 Oct 2016

👍3

After an apt update and an apt upgrade I installed proot but could not install termux-chroot:

$ apt install termux-chroot
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package termux-chroot

I'm not using a rooted Android, and proot was not sufficient. Thanks for the idea though.

christianrondeau on 2 Oct 2016

termux-chroot is part of proot, so you should have it installed already

Neo-Oli on 2 Oct 2016

👍1

I don't think so... Here's the output of apt list items starting with termux:

termux-api/stable 0.20 aarch64
termux-elf-cleaner/stable 1.1 aarch64
termux-tools/stable,now 0.29 all [installed]

christianrondeau on 2 Oct 2016

It's not a separate package, just a script bundled with proot. Just try running termux-chroot after installing proot

Neo-Oli on 2 Oct 2016

It is not for a rooted phone it is the opposite. It provides just regular linux root system even within non-rooted system. After running termux-chroot you have all executables where they are usually in linux distros. ~~Look where sh is with which sh before and after for comparison.~~ That wasn't true because how PATH is but it can also be seen in /usr/bin/sh after termux-chrooting

tomaklutfu on 2 Oct 2016

👍1

It's working! The output of which sh did not change but the desired outcome is there :)

Thank you, that will be very, very useful in the future!

christianrondeau on 2 Oct 2016

I just tried termux-chroot, and I wasn't able to access my device's storage (photos, screenshots, downloads, etc.). Is there a workaround for that?

epitron on 2 Oct 2016

yes, run termux-setup-storage (from outside of termux-chroot). This will setup symlinks in the storage folder, which will work in proot.

Neo-Oli on 2 Oct 2016

Ah! Nice! This is a decent solution to the shebang problem. Thanks!

epitron on 2 Oct 2016

@Neo-Oli , why not just simply symlinkig /sdcard/emulated/0 -> ~/storage ? Seems to work... Also, perhaps termux-chroot could do it automagically by default (or using some option).

andree182 on 18 Oct 2016

termux-chroot works. However I noticed every command takes a while to run.

-bash-4.4$ time ls /storage/emulated/0 >/dev/null

real    0m0.049s
user    0m0.017s
sys     0m0.013s
-bash-4.4$ termux-chroot
bash-4.4$ time ls /storage/emulated/0 >/dev/null

real    0m1.555s
user    0m0.020s
sys     0m0.013s

Can this be rectified?

gene-pavlovsky on 4 Nov 2016

I m not able to run metasploit in my termux after giving command ./msfconsole it showing .Segmentation faultetasploit Framework consoLe.... Plzzzz help