Description

Starting v2.23.0 something broke and doing basic docker-compose pull fails when run from systemd unit, I assume this is due to lack of env var as the error seen is:

initializing git cache: could not create any of the following paths: /.cache/docker-compose

I can't imagine writing in root is desired but again is probably side effect of $HOME not being set. We should no longer assume / is writeable which more and more is not, considering OS with ro root fs like coreos. We can also not assume $HOME is set, some stronger mechanism should be used.

Rolling back to v2.22.x works fine

Steps To Reproduce

1. create a oneshot systemd unit that runs docker-compose pull
2. start the unit
3. journalctl will show the error

Noticed on fedora coreos

Compose Version

Docker Compose version v2.22.0

no plugin

Docker Environment

Client:
 Context:    default
 Debug Mode: false

Server:
 Containers: 7
  Running: 7
  Paused: 0
  Stopped: 0
 Images: 7
 Server Version: 20.10.23
 Storage Driver: overlay2
  Backing Filesystem: xfs
  Supports d_type: true
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: journald
 Cgroup Driver: systemd
 Cgroup Version: 2
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
 Swarm: inactive
 Runtimes: io.containerd.runc.v2 io.containerd.runtime.v1.linux runc
 Default Runtime: runc
 Init Binary: /usr/libexec/docker/docker-init
 containerd version: 
 runc version: 
 init version: 
 Security Options:
  seccomp
   Profile: default
  selinux
  cgroupns
 Kernel Version: 6.4.15-200.fc38.x86_64
 Operating System: Fedora CoreOS 38.20230902.3.0
 OSType: linux
 Architecture: x86_64
 CPUs: 4
 Total Memory: 1.907GiB
 Name: bastion01-test-5grcs-com
 ID: J7JL:ULEZ:XK6Z:APFN:4HTL:P3H3:CISE:2KTK:IVDM:P7O3:5R46:YMZY
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 Username: ericbsummit
 Registry: https://index.docker.io/v1/
 Labels:
 Experimental: false
 Insecure Registries:
  127.0.0.0/8
 Live Restore Enabled: true

Anything else?

cat /etc/os-release

NAME="Fedora Linux"
VERSION="38.20230902.3.0 (CoreOS)"
ID=fedora
VERSION_ID=38
VERSION_CODENAME=""
PLATFORM_ID="platform:f38"
PRETTY_NAME="Fedora CoreOS 38.20230902.3.0"
ANSI_COLOR="0;38;2;60;110;180"
LOGO=fedora-logo-icon
CPE_NAME="cpe:/o:fedoraproject:fedora:38"
HOME_URL="https://getfedora.org/coreos/"
DOCUMENTATION_URL="https://docs.fedoraproject.org/en-US/fedora-coreos/"
SUPPORT_URL="https://github.com/coreos/fedora-coreos-tracker/"
BUG_REPORT_URL="https://github.com/coreos/fedora-coreos-tracker/"
REDHAT_BUGZILLA_PRODUCT="Fedora"
REDHAT_BUGZILLA_PRODUCT_VERSION=38
REDHAT_SUPPORT_PRODUCT="Fedora"
REDHAT_SUPPORT_PRODUCT_VERSION=38
SUPPORT_END=2024-05-14
VARIANT="CoreOS"
VARIANT_ID=coreos
OSTREE_VERSION='38.20230902.3.0'