Distros reserve /opt for different things (some package managers own it
outright), and a DECNET install that wants to live at /srv/decnet or
/usr/local/decnet had to hand-edit 13 service files post-install.
Converts every deploy/decnet-*.service to a .j2 template keyed on
{{ install_dir }}, rendered by `decnet init` at install time. All other
paths (log_dir, state_dir, runtime_dir, user, group) stay standard —
only install_dir varies.
Changes:
- deploy/decnet-*.service → deploy/decnet-*.service.j2 (13 files).
- decnet init gains --install-dir (default /opt/decnet, preserves
existing behaviour byte-for-byte). Validates absolute-path at the
CLI boundary. Threads through useradd --home-dir and the dir-creation
list so the filesystem layout matches the rendered templates.
- _install_units renders via Jinja2 with StrictUndefined (typo → loud
error, not a silent broken unit). SHA over rendered output so
operators with a custom install_dir get idempotent re-runs.
- decnet.target, tmpfiles.d, polkit rule stay static — they don't
reference install paths.
- 4 new tests: custom install_dir renders into units, default remains
/opt/decnet, relative paths rejected, second run with same custom
dir is idempotent.
Reverse of init, step-by-step: systemctl disable --now decnet.target,
remove every decnet-*.service + decnet.target unit file, drop the
polkit rule, drop the tmpfiles.d entry, daemon-reload, remove
/etc/decnet + /etc/decnet/config.ini, /run/decnet, /opt/decnet, and
userdel/groupdel the decnet identity.
Preserves /var/lib/decnet and /var/log/decnet by default — those
hold operator data. Pass `--deinit --purge` to rm -rf them too.
Idempotent on a clean host (every step prints [SKIP]). Honours
--dry-run.
5 new tests cover the full-undo path, --purge, idempotent clean-host
deinit, dry-run side-effect-free behaviour, and the --purge without
--deinit guard.
Creates the decnet system user/group, installs every unit file from
deploy/ into /etc/systemd/system, drops the polkit rule, seeds
/opt/decnet + /var/{lib,log}/decnet + /etc/decnet + /run/decnet,
writes a placeholder /etc/decnet/config.ini, applies the new
tmpfiles.d entry so /run/decnet survives reboots, daemon-reloads,
and `systemctl enable --now decnet.target`.
Idempotent (re-runs print [SKIP] on already-configured items),
--dry-run previews the plan without touching anything, --no-start
defers the target start, --force overwrites even matching unit
files. Master-only (added to MASTER_ONLY_COMMANDS).
9 orchestration tests cover the non-root gate, dry-run, useradd/
groupadd argv, SKIP on present user/group, unit-file idempotency,
--force overwrite, --no-start suppression, happy path, and the
"deploy/ not found" error message.
