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Add instructions for sharing ccache with other user

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Martchus 2021-07-20 18:55:25 +02:00
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@ -215,6 +215,22 @@ you start the server with has permissions to read and write there. Otherwise the
configure errors can be confusing. Internally the server is mounting that directory like configure errors can be confusing. Internally the server is mounting that directory like
described in [the wiki](https://wiki.archlinux.org/index.php/Ccache#makechrootpkg). described in [the wiki](https://wiki.archlinux.org/index.php/Ccache#makechrootpkg).
If you want to use the existing `ccache` directory owned by your current user, you could do
the following to grant the `buildservice` user access to it:
1. Add new group for accessing the cache and add the users to it:
`sudo groupadd ccache`, `sudo usermod -a -G ccache "$USER"`, `sudo usermod -a -G ccache buildservice`
2. Set group ownership: `sudo chown -R $USER:ccache $ccache_dir`
3. Ensure dirs are readable by the group and that the group is inherited:
`sudo find "$ccache_dir" -type d -exec chmod 2775 {} \+`
4. Ensure that all files are readable by the group:
`sudo find "$ccache_dir" -type f -exec chmod 664 {} \+`
5. Add `umask = 002` to the ccache config so new files/dirs created by it are fully accessible by
the group.
6. Patch `devtools` so additional groups are configured within the container (see
https://github.com/Martchus/devtools/commit/b981c6afe81219ff4ca1ea34d0be5cc681408962)
Note that ccache *slows* down the initial compilation. It is only useful to enable it if rebuilds Note that ccache *slows* down the initial compilation. It is only useful to enable it if rebuilds
with only slight changes are expected. Currently it is *not* possible to enable/disable ccache usage with only slight changes are expected. Currently it is *not* possible to enable/disable ccache usage
per package (e.g. via a regex). per package (e.g. via a regex).