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By default, restic determines the location of the cache based on the XDG base dir specification, which is `~/.cache/restic` when the environment variable `$XDG_CACHE_HOME` isn't set. As restic is executed as root by default, this resulted in the cache being written to `/root/.cache/restic`, which is not quite right for a system service and also meant, multiple backup services would use the same cache directory - potentially causing issues with locking, data corruption, etc. The goal was to ensure, restic uses the correct cache location for a system service - one cache per backup specification, using `/var/cache` as the base directory for it. systemd sets the environment variable `$CACHE_DIRECTORY` once `CacheDirectory=` is defined, but restic doesn't change its behavior based on the presence of this environment variable. Instead, the specifier [1] `%C` can be used to point restic explicitly towards the correct cache location using the `--cache-dir` argument. Furthermore, the `CacheDirectoryMode=` was set to `0700`, as the default of `0755` is far too open in this case, as the cache might contain sensitive data. [1] https://www.freedesktop.org/software/systemd/man/systemd.unit.html#Specifiers |
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| .. | ||
| administration | ||
| configuration | ||
| development | ||
| installation | ||
| release-notes | ||
| .gitignore | ||
| contributing-to-this-manual.xml | ||
| default.nix | ||
| Makefile | ||
| man-configuration.xml | ||
| man-nixos-build-vms.xml | ||
| man-nixos-enter.xml | ||
| man-nixos-generate-config.xml | ||
| man-nixos-install.xml | ||
| man-nixos-option.xml | ||
| man-nixos-rebuild.xml | ||
| man-nixos-version.xml | ||
| man-pages.xml | ||
| manual.xml | ||
| preface.xml | ||
| README | ||
| shell.nix | ||
Moved to: ./contributing-to-this-manual.xml. Link: https://nixos.org/manual/nixos/unstable/#chap-contributing