[Bug] g.extension -s generates unexpected warnings in case of read-only target #3052
Description
Describe the bug
Using g.extension -s generates unexpected warnings in case of a read-only target directory:
WARNING: Unable to create
'/home/mneteler/software/grass82/dist.x86_64-pc-linux-gnu/docs/html/grass_logo.png':
'/home/mneteler/software/grass82/dist.x86_64-pc-linux-gnu/docs/html/grass_logo.png'
and
'/home/mneteler/software/grass82/dist.x86_64-pc-linux-gnu/docs/html/grass_logo.png'
are the same file. Is the GRASS GIS documentation package
installed? Installation continues, but documentation may not look
right.
...
In a docker container, it may look like this:
Executing <g.extension -s extension=i.cutlines> ...
WARNING: Unable to create '/usr/local/grass82/docs/html/grass_logo.png':
'/usr/local/grass82/docs/html/grass_logo.png' and
'/usr/local/grass82/docs/html/grass_logo.png' are the same file.
Is the GRASS GIS documentation package installed? Installation
continues, but documentation may not look right.
WARNING: Unable to create
'/usr/local/grass82/docs/html/hamburger_menu.svg':
'/usr/local/grass82/docs/html/hamburger_menu.svg' and
'/usr/local/grass82/docs/html/hamburger_menu.svg' are the same
file. Is the GRASS GIS documentation package installed?
Installation continues, but documentation may not look right.
WARNING: Unable to create
'/usr/local/grass82/docs/html/hamburger_menu_close.svg':
'/usr/local/grass82/docs/html/hamburger_menu_close.svg' and
'/usr/local/grass82/docs/html/hamburger_menu_close.svg' are the
same file. Is the GRASS GIS documentation package installed?
Installation continues, but documentation may not look right.
WARNING: Unable to create '/usr/local/grass82/docs/html/grassdocs.css':
'/usr/local/grass82/docs/html/grassdocs.css' and
'/usr/local/grass82/docs/html/grassdocs.css' are the same file. Is
the GRASS GIS documentation package installed? Installation
continues, but documentation may not look right.
Fetching <i.cutlines> from GRASS GIS Addons repository (be patient)...
Compiling...
Installing...
Updating extensions metadata file...
Updating extension modules metadata file...
Installation of <i.cutlines> successfully finished
Execution of <g.extension -s extension=i.cutlines> finished.
To Reproduce
Steps to reproduce the behavior:
Just compile and do not install GRASS GIS but run it from the compile directory (so, at user level):
grass82 ~/grassdata/nc_spm_08_grass7/user1
g.extension -s i.cutlines
However, -s tries to write to /usr/ which is write-protected when running things a user.
See above error.
Expected behavior
Catch the read-only situation and issue an appropriate warning which directory g.extension unsuccessfully tries to write into.
System description (please complete the following information):
- Operating System: Fedora, alpine docker, ...
- GRASS GIS version: 8.x (tested with 8.2 and 8.4.dev).