mirror of
https://github.com/cozystack/cozystack.git
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Aleksei Sviridkin
77992514f9
A long VMI name is cut before the hash is appended; when the cut lands on a dot the result is not a DNS subdomain unless the trailing dot or dash is dropped, and no input exercised that boundary. The parser's doc no longer claims to validate names it leaves to the lookup. Assisted-by: LLM Signed-off-by: Aleksei Sviridkin <f@lex.la>
106 lines
3.5 KiB
Go
106 lines
3.5 KiB
Go
/*
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Copyright 2026 The Cozystack Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package model
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import (
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"bytes"
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"crypto/sha256"
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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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"io"
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"strconv"
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"strings"
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"k8s.io/apimachinery/pkg/util/validation"
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)
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// DeviceRef is one entry of the gpu.AnnotationDevices list on a VMI:
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// exactly one of Device and DeviceTemplate is set.
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type DeviceRef struct {
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// Device names a GPUDevice in the VMI's namespace.
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Device string `json:"device,omitempty"`
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DeviceTemplate *DeviceTemplate `json:"deviceTemplate,omitempty"`
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}
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// DeviceTemplate asks for a GPUDevice created at VMI start and deleted
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// with the VMI.
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type DeviceTemplate struct {
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ClassName string `json:"className"`
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Count int32 `json:"count"`
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}
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// ParseDeviceRefs reads the gpu.AnnotationDevices value and checks its
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// shape. Device and class names are not checked here; a malformed one is
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// refused when the webhook looks it up.
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func ParseDeviceRefs(s string) ([]DeviceRef, error) {
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dec := json.NewDecoder(bytes.NewReader([]byte(s)))
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dec.DisallowUnknownFields()
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var refs []DeviceRef
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if err := dec.Decode(&refs); err != nil {
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return nil, fmt.Errorf("parse device references: %w", err)
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}
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if _, err := dec.Token(); err != io.EOF {
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return nil, errors.New("parse device references: data after the list")
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}
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if len(refs) == 0 {
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return nil, errors.New("device references: empty list")
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}
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seen := map[string]bool{}
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for i, r := range refs {
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switch {
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case (r.Device == "") == (r.DeviceTemplate == nil):
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return nil, fmt.Errorf("device reference %d: set exactly one of device and deviceTemplate", i)
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case r.DeviceTemplate != nil && r.DeviceTemplate.ClassName == "":
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return nil, fmt.Errorf("device reference %d: deviceTemplate needs className", i)
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case r.DeviceTemplate != nil && r.DeviceTemplate.Count < 1:
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return nil, fmt.Errorf("device reference %d: deviceTemplate count must be at least 1", i)
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case seen[r.Device]:
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return nil, fmt.Errorf("device reference %d: device %s is referenced twice", i, r.Device)
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}
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if r.Device != "" {
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seen[r.Device] = true
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}
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}
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return refs, nil
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}
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// FormatDeviceRefs renders refs as the gpu.AnnotationDevices value.
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func FormatDeviceRefs(refs []DeviceRef) (string, error) {
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b, err := json.Marshal(refs)
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if err != nil {
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return "", fmt.Errorf("format device references: %w", err)
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}
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return string(b), nil
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}
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// TemplateDeviceName names the GPUDevice created for the deviceTemplate
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// entry at index of a VMI's references, so a repeated admission or a
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// recreated VMI finds the same device. A VMI name too long to take the
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// suffix is cut short and followed by a hash of the full name.
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func TemplateDeviceName(vmi string, index int) string {
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suffix := "-gpu-" + strconv.Itoa(index)
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if len(vmi)+len(suffix) <= validation.DNS1123SubdomainMaxLength {
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return vmi + suffix
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}
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sum := sha256.Sum256([]byte(vmi))
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hash := hex.EncodeToString(sum[:])[:10]
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keep := validation.DNS1123SubdomainMaxLength - len(suffix) - len(hash) - 1
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return strings.TrimRight(vmi[:keep], "-.") + "-" + hash + suffix
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}
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