[Bug]: chezmoi fails to run scripts

[VorpalBlade]

Problem description

chezmoi installed from the official termux repositories fail to execute scripts. This is specific to the termux environment, and works fine on normal desktop Linux.

Based on a bug report in chezmoi this is a termux bug: https://github.com/twpayne/chezmoi/issues/2345

The issue seems to be that termux uses LD_PRELOAD hacks that don't take effect on programs written in Go. An alternative solution to enable full functionality on Termux is needed (as the upstream developer does not consider this a bug in chezmoi).

Steps to reproduce the behavior.

$ pkg install chezmoi
$ chezmoi init
$ chezmoi cd
$ echo "#!/usr/bin/env bash" > run_test.sh
$ echo "echo Hi" >> run_test.sh
$ chezmoi apply

What is the expected behavior?

The run_ script should execute, and in this case print "Hi"

Instead you will get an output like the following:

chezmoi: fork/exec /data/data/com.termux/files/usr/tmp/1634744225.test.sh: no such file or directory

System information

• Termux application version: Termux from F-Droid version 0.118.0
• Android OS version: Android 11
• Device model: OnePlus 6

[2096779623]

https://github.com/twpayne/chezmoi/issues/2345#issuecomment-1241338143

[Grimler91]

Is it possible to use templates in scripts? If yes then something like

$ cat run_test.sh.tmpl
{{- if eq .chezmoi.os "android" }}
#!/data/data/com.termux/files/usr/bin/env bash
{{ else }}
#!/usr/bin/env bash
{{ end }}
echo Hi

could work. For it to work without such a workaround we would have to patch our golang and add the same functionality as we have in libtermux-exec.

Tangentially related: we have an open feature request for adding support for golang's "shebangs" (like //usr/bin/go run $0 $@ ; exit) over at https://github.com/termux/termux-exec/issues/22.

[VorpalBlade]

Ah, yes, It is possible to be even more elegant:

#!{{ lookPath "bash" }}
[ ... ]

That solves my immediate problem. However, that is specific to chezmoi. I don't know if there are any other Go programs that need to execute scripts that lack the template functionality. None that I use that I know of.