Monorepo for Tangled
tangled.org
spindle/microvm: use consistent qmp sock paths to avoid the AF_UNIX path limit
Signed-off-by: dawn <dawn@tangled.org>
author
dawn
date
(Jun 19, 2026, 11:10 PM +0300)
commit
4dcbbc93
4dcbbc934dfa0097ca0039756231bbb4713811e0
parent
1f34ccc0
1f34ccc00973f6209bff3540cb02829557e1708d
+27
-1
+4
docker-compose.yml
+4
docker-compose.yml
···
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SPINDLE_MICROVM_PIPELINES_OVERLAY_DIR: /var/lib/spindle/overlays
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SPINDLE_MICROVM_PIPELINES_AGENT_PORT: "11240"
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SPINDLE_S3_LOG_BUCKET: ""
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SPINDLE_MICROVM_PIPELINES_ENABLE_CGROUPS: "false"
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# these two are required for cgroups, uncomment if testing
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# privileged: true
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# cgroup: host
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devices:
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- /dev/vsock:/dev/vsock
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- /dev/kvm:/dev/kvm
+23
-1
spindle/engines/microvm/qemu.go
+23
-1
spindle/engines/microvm/qemu.go
···
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import (
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"context"
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"crypto/sha256"
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_ "embed"
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"encoding/hex"
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"encoding/json"
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"errors"
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"fmt"
···
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serialLogPath string
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workDir string
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qmpSocketPath string
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+
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cmd *exec.Cmd
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done chan struct{}
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qemuLogFile *os.File
···
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}, logger)
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}
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// we hash the workDir to get a deterministic qmpSock path
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// since they are AF_UNIX sockets, they are bound by a 108 char long path limit...
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func qmpSocketPath(workDir string) string {
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base := filepath.Dir(workDir)
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if workDir == "" {
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base = os.TempDir()
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}
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sum := sha256.Sum256([]byte(workDir))
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return filepath.Join(base, hex.EncodeToString(sum[:8])+".qmp.sock")
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}
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func StartQEMU(ctx context.Context, cfg QEMUConfig, logger *slog.Logger) (VMHandle, error) {
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if logger == nil {
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logger = slog.Default()
···
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qmpPath := cfg.QMPPath
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if qmpPath == "" {
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qmpPath = filepath.Join(workDir, "qmp.sock")
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qmpPath = qmpSocketPath(workDir)
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handle.qmpSocketPath = qmpPath
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}
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handle.QMPPath = qmpPath
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···
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if h.cgroup != nil {
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closeErr = errors.Join(closeErr, h.cgroup.Close())
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h.cgroup = nil
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}
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if h.qmpSocketPath != "" {
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if err := os.Remove(h.qmpSocketPath); err != nil && !os.IsNotExist(err) {
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closeErr = errors.Join(closeErr, err)
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}
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h.qmpSocketPath = ""
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}
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return closeErr
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}