How to modify hosts file?

[aximili]

I want to apply a certain hosts file (that I have on my SD card) when I open a particular app, and restore the original hosts file on exit.
I thought Automagic would be the perfect tool to do it.

My idea was:
App launch -> Copy/rename /etc/hosts to /etc/hosts1 -> Copy /emulated/0/my-hosts to /etc/hosts
App exit -> Rename /etc/hosts1 back to /etc/hosts

I tried using "Move files" hoping to rename /etc/hosts to /etc/hosts1 but it didn't even work (/etc/hosts1: open failed: EROFS (Read-only file system))
Could someone help me please?

(I found this Tasker task that seems to modify hosts file but couldn't find an Automagic one https://forum.xda-developers.com/u/task ... e-t3659602)

[Micky Micky]

Hello

I don't know how to link you to my earlier posts, but if you search this forum for "Delete files in root folder" this may shed some light on your problem.

Hope this helps

Micky

[aximili]

Thank you Micky it is definitely useful.

I tried this

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mv /etc/hosts /etc/hosts1

and I seem to run into the same error:
stderr=mv: bad '/etc/hosts': Read-only file system

I am now trying to make sense of Desmanto's reply to you about mounting as rw...

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mount | grep /etc

That produced nothing in the stdout. I guess it is another question, thanks Micky!

[Micky Micky]

Hello

"I couldn't mount /system as rw but it worked without the word system."

This might help. It did for me.

Good luck

Micky

[aximili]

Thank you Micky for trying to help me! So I've tried this:

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mount -o rw,remount /system

That gave me mount: '/system' not in /proc/mounts

Then I tried this:

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mount -o rw,remount

That seems successful? (nothing in stderr)

But after that, trying

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mv /etc/hosts /etc/hosts1

still gave me mv: bad '/etc/hosts': Read-only file system :'(

[Hit]

Does your phone have root access?
And enable this: Root functions (Experimental)?

[aximili]

Yes I had already have Root functions enabled, thanks Hit.
AdAway is working fine on my phone (it writes to the hosts file, I can see the hosts file entries changing when I use AdAway)