agent v0.35.1: shared-parent unit runs before pve-guests on host boot

The shared-parent oneshot never ran before pve-guests (WantedBy=multi-user
wasn't pulled into the boot transaction), so on a host reboot the guest bound a
not-yet-shared parent -> private -> propagation broken. Now WantedBy=pve-guests
(pve-guests pulls it in + Before= orders it first); EnsureSharedParent reinstalls
the unit when content differs so the fix deploys.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

CHANGELOG.md

@@ -3,6 +3,14 @@
 All notable changes to **felhom-agent** are recorded here. Update on every code
 change that gets pushed.
 
+## v0.35.1 — shared-parent unit: run before pve-guests on host boot (2026-06-15)
+
+Fix for the host-reboot ordering (the shared-parent oneshot never ran before pve-guests on the live
+host, so the guest bound a not-yet-shared parent → private bind → propagation broken). The unit now uses
+`WantedBy=pve-guests.service` (pve-guests PULLS IT IN + Before= orders it first) instead of the
+unreliable `WantedBy=multi-user.target`, and drops `DefaultDependencies=no`. `EnsureSharedParent`
+reinstalls the unit when its content differs (so the fix deploys on the next agent start/reconcile).
+
 ## v0.35.0 — intermediary mount: guest-reboot re-propagation (load-bearing) (2026-06-15)
 
 Fix for the guest-reboot gap (caught in the live demo migration). A guest's parent bind is

cmd/felhom-agent/main.go

@@ -44,7 +44,7 @@ import (
 
 // version is the agent version. Overridable at build time with
 // -ldflags "-X main.version=<v>"; defaults to the in-repo CHANGELOG version.
-var version = "0.35.0"
+var version = "0.35.1"
 
 // runGuestHook is the PVE pre-start hook body (`felhom-agent guest-hook <vmid> <phase>`). On the
 // pre-start phase it creates placeholder dirs for any absent bind-mount source so the guest always boots

internal/localapi/intermediary.go

@@ -37,9 +37,13 @@ mount --make-shared ` + StableParentDir + `
 `
 
 const sharedParentUnitPath = "/etc/systemd/system/felhom-shared-parent.service"
+
+// sharedParentUnit MUST run before pve-guests so the guest's parent bind inherits the shared peer group.
+// WantedBy=pve-guests.service makes pve-guests itself PULL IT IN (and Before= orders it first) — a plain
+// WantedBy=multi-user.target proved unreliable (the unit wasn't pulled into the boot transaction; it
+// never ran before pve-guests). local-fs.target ordering ensures /mnt is available.
 const sharedParentUnit = `[Unit]
 Description=Felhom stable drive parent (shared bind for live drive hot-swap)
-DefaultDependencies=no
 After=local-fs.target
 Before=pve-guests.service
 ConditionPathExists=` + sharedParentScriptPath + `
@@ -50,7 +54,7 @@ RemainAfterExit=yes
 ExecStart=` + sharedParentScriptPath + `
 
 [Install]
-WantedBy=multi-user.target
+WantedBy=pve-guests.service multi-user.target
 `
 
 // StablePathForRaw maps a drive's RAW host mount (/mnt/<name>) to its stable in-guest path
@@ -94,9 +98,10 @@ func (b *GuestBinder) EnsureSharedParent(ctx context.Context) error {
 	if err := b.run(ctx, "mount", "--make-shared", StableParentDir); err != nil {
 		return fmt.Errorf("shared-parent: make-shared: %w", err)
 	}
-	// Install the boot-persistence unit only if it's not already there — EnsureSharedParent runs on a
+	// Install the boot-persistence unit only when missing OR its content differs from what we ship (so a
-	// periodic reconcile, and re-writing files + daemon-reload every tick would be wasteful.
+	// unit-template fix deploys) — EnsureSharedParent runs on a periodic reconcile, and re-writing files +
-	if _, err := os.Stat(sharedParentUnitPath); err != nil {
+	// daemon-reload every tick would be wasteful, so the common case (unchanged) is a cheap read.
+	if cur, err := os.ReadFile(sharedParentUnitPath); err != nil || string(cur) != sharedParentUnit {
 		if ierr := b.installSharedParentUnit(ctx); ierr != nil {
 			b.logger.Warn("shared-parent: boot-persistence unit install failed (live setup OK; survives until host reboot)", "err", ierr)
 		}