panic: get user cache dir: neither $XDG_CACHE_HOME nor $HOME are defined

[Glandos]

gonic version: 0.16

if from docker, docker tag:
if from source, git tag/branch: b17e76e

It seems that a669ba8 introduced os.UserCacheDir() which fails.

I expect gonic to use cache-path from the configuration.

[sentriz]

oh interesting. which OS?

[Glandos]

Debian/testing, but I think that this "particular setup" comes from my systemd unit:

root@belette64/u/l/bin> systemctl cat gonic.service
# /etc/systemd/system/gonic.service
[Unit]
Description=Gonic Subsonic API server
After=network.target

[Service]
Type=simple
DynamicUser=yes
Group=nas

StateDirectory=gonic
CacheDirectory=gonic
ConfigurationDirectory=gonic

Restart=on-failure
RestartSec=10

ExecStart=/usr/local/bin/gonic -config-path /etc/gonic/config

MemoryDenyWriteExecute=true

# See https://github.com/sentriz/gonic/issues/391
Environment=XDG_CACHE_HOME=/var/cache/gonic/

[Install]
WantedBy=multi-user.target

# /etc/systemd/system/gonic.service.d/00security.conf
[Service]
SystemCallFilter=@system-service
PrivateDevices=yes
ProtectHome=yes
ProtectSystem=strict
PrivateUsers=yes
PrivateTmp=yes
NoNewPrivileges=yes
ProtectClock=yes
ProtectKernelLogs=yes
ProtectKernelModules=yes
ProtectKernelTunables=yes
ProtectProc=invisible
ProcSubset=pid
CapabilityBoundingSet=
RestrictRealtime=yes
ProtectHostname=yes
RestrictNamespaces=yes
LockPersonality=yes
RestrictSUIDSGID=yes
ProtectControlGroups=yes
RemoveIPC=yes
SystemCallArchitectures=native

Adding the Environment= line makes it happy though :)

[sentriz]

hm I suppose that since you created a specific gonic user without a home dir, there was no xdg cache dir found.

yeah I think you're right in reusing the cache-path for the MPV socket is best. since it's required to be defined