Add --follow_symlink to ynh_secure_remove

[Salamandar]

The problem

yunohost/issues#2253

Solution

• add --follow_symlink to ynh_secure_remove
• Call readlink -f if --follow_symlink
• test for file AND symlink existence.

PR Status

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How to test

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[kay0u]

So we don't remove the link?

[chri2]

A symlink is just a file. My expectation (beside an additional --follow-symlinks) would be that the file is deleted no matter whether the symlink is broken or not, points to a socket, directory or whatever. I stumbled over this already...

I started using rm for symlinks: https://codeberg.org/flohmarkt/flohmarkt_ynh/issues/52

[Salamandar]

@chri2 Yes, I fully agree. The issue described here is not that.
The current issue is that if a symlink is broken, trying to remove it from the helper doesn't work.