94 lines
3 KiB
Go
94 lines
3 KiB
Go
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package storev1
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import (
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"bytes"
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"encoding/base64"
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"fmt"
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"github.com/nix-community/go-nix/pkg/storepath"
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)
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// Validate performs some checks on the PathInfo struct, returning either the
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// StorePath of the root node, or an error.
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func (p *PathInfo) Validate() (*storepath.StorePath, error) {
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// ensure References has the right number of bytes.
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for i, reference := range p.GetReferences() {
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if len(reference) != storepath.PathHashSize {
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return nil, fmt.Errorf("invalid length of digest at position %d, expected %d, got %d", i, storepath.PathHashSize, len(reference))
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}
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}
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// If there's a Narinfo field populated..
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if narInfo := p.GetNarinfo(); narInfo != nil {
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// ensure the number of references matches len(References).
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if len(narInfo.GetReferenceNames()) != len(p.GetReferences()) {
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return nil, fmt.Errorf("inconsistent number of references: %d (references) vs %d (narinfo)", len(narInfo.GetReferenceNames()), len(p.GetReferences()))
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}
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// for each ReferenceName…
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for i, referenceName := range narInfo.GetReferenceNames() {
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// ensure it parses to a store path
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storePath, err := storepath.FromString(referenceName)
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if err != nil {
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return nil, fmt.Errorf("invalid ReferenceName at position %d: %w", i, err)
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}
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// ensure the digest matches the one at References[i]
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if !bytes.Equal(p.GetReferences()[i], storePath.Digest) {
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return nil, fmt.Errorf(
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"digest in ReferenceName at position %d does not match digest in PathInfo, expected %s, got %s",
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i,
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base64.StdEncoding.EncodeToString(p.GetReferences()[i]),
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base64.StdEncoding.EncodeToString(storePath.Digest),
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)
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}
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}
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}
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// ensure there is a (root) node present
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rootNode := p.GetNode()
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if rootNode == nil {
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return nil, fmt.Errorf("root node must be set")
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}
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// ensure it properly parses to a store path, and in case it refers to a digest, ensure it has the right length.
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if node := rootNode.GetDirectory(); node != nil {
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if len(node.Digest) != 32 {
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return nil, fmt.Errorf("invalid digest size for %s, expected %d, got %d", node.Name, 32, len(node.Digest))
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}
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storePath, err := storepath.FromString(string(node.GetName()))
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if err != nil {
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return nil, fmt.Errorf("unable to parse %s as StorePath: %w", node.Name, err)
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}
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return storePath, nil
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} else if node := rootNode.GetFile(); node != nil {
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if len(node.Digest) != 32 {
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return nil, fmt.Errorf("invalid digest size for %s, expected %d, got %d", node.Name, 32, len(node.Digest))
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}
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storePath, err := storepath.FromString(string(node.GetName()))
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if err != nil {
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return nil, fmt.Errorf("unable to parse %s as StorePath: %w", node.Name, err)
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}
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return storePath, nil
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} else if node := rootNode.GetSymlink(); node != nil {
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storePath, err := storepath.FromString(string(node.GetName()))
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if err != nil {
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return nil, fmt.Errorf("unable to parse %s as StorePath: %w", node.Name, err)
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}
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return storePath, nil
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} else {
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// this would only happen if we introduced a new type
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panic("unreachable")
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}
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}
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