nixpkgs/nixos/doc
Elias Probst 27da11972d nixos/restic: correct location of cache directory
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
2021-01-30 18:24:51 -08:00
..
manual nixos/restic: correct location of cache directory 2021-01-30 18:24:51 -08:00
varlistentry-fixer.rb nixos/doc/*: fix indentation 2020-11-12 14:24:00 +10:00
xmlformat.conf doc: Disable wrapping source 2019-09-18 21:17:52 +02:00