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fix(network): converge when the docker network already exists

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installDockerNetwork errored with 'network with name <x> already exists'
on re-runs: the requirement check sets DOCKER_NETWORK_SETUP_NEEDED=true
whenever 'docker network inspect' returns non-zero, but that also happens
when the rootless daemon socket isn't reachable yet — indistinguishable
from the network being genuinely absent. A prior install also leaves the
network behind, so the flag fires on every re-install.

Re-check existence right before creating and converge: if the network is
already there, leave it in place and adopt its real subnet into CFG rather
than erroring. This also stops the spurious subnet randomization (and the
resulting CFG drift) that ran before the doomed create.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
librelad 2026-06-02 15:02:36 +01:00
parent c04b6d43e5
commit 14e6d4aba1
1 changed files with 35 additions and 19 deletions
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26
scripts/docker/network/network_setup.sh
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@ -2,10 +2,29 @@
installDockerNetwork() installDockerNetwork()
{ {
# Check if network setup is needed if [[ "$DOCKER_NETWORK_SETUP_NEEDED" != "true" ]]; then
if [[ "$DOCKER_NETWORK_SETUP_NEEDED" == "true" ]]; then isNotice "Docker network $CFG_NETWORK_NAME already exists or setup not needed"
return 0
fi
isHeader "Create a Docker Network" isHeader "Create a Docker Network"
# Re-check existence right before creating, and converge instead of erroring
# if it's already there. The requirement check that set
# DOCKER_NETWORK_SETUP_NEEDED can run before the rootless daemon socket is
# reachable (a failed inspect is indistinguishable from "network absent"), and
# a previous install leaves the network behind — both make us think it's new
# when it isn't. If it exists, leave it in place and adopt its real subnet so
# CFG stays in step with docker (and we don't randomize to a subnet we can't apply).
if dockerCommandRun "docker network inspect $CFG_NETWORK_NAME > /dev/null 2>&1"; then
local current_subnet; current_subnet=$(dockerCommandRun "docker network inspect $CFG_NETWORK_NAME --format '{{range .IPAM.Config}}{{.Subnet}}{{end}}' 2>/dev/null")
isNotice "Docker network $CFG_NETWORK_NAME already exists, leaving it in place"
if [[ -n "$current_subnet" && "$current_subnet" != "$CFG_NETWORK_SUBNET" ]]; then
adoptDockerSubnet "$current_subnet"
fi
return 0
fi
isNotice "Network $CFG_NETWORK_NAME not found, creating now" isNotice "Network $CFG_NETWORK_NAME not found, creating now"
# Check if we need to generate a new subnet # Check if we need to generate a new subnet
@ -28,7 +47,4 @@ $CFG_NETWORK_NAME"
isError "Failed to create Docker network $CFG_NETWORK_NAME" isError "Failed to create Docker network $CFG_NETWORK_NAME"
isError " $result" isError " $result"
fi fi
else
isNotice "Docker network $CFG_NETWORK_NAME already exists or setup not needed"
fi
} }