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package importer
import (
castorev1pb "code.tvl.fyi/tvix/castore-go"
storev1pb "code.tvl.fyi/tvix/store-go"
"fmt"
"github.com/nix-community/go-nix/pkg/narinfo"
"github.com/nix-community/go-nix/pkg/storepath"
)
// GenPathInfo takes a rootNode and narInfo and assembles a PathInfo.
// The rootNode is renamed to match the StorePath in the narInfo.
func GenPathInfo(rootNode *castorev1pb.Node, narInfo *narinfo.NarInfo) (*storev1pb.PathInfo, error) {
// parse the storePath from the .narinfo
storePath, err := storepath.FromAbsolutePath(narInfo.StorePath)
if err != nil {
return nil, fmt.Errorf("unable to parse StorePath: %w", err)
}
// construct the references, by parsing ReferenceNames and extracting the digest
references := make([][]byte, len(narInfo.References))
for i, referenceStr := range narInfo.References {
// parse reference as store path
referenceStorePath, err := storepath.FromString(referenceStr)
if err != nil {
return nil, fmt.Errorf("unable to parse reference %s as storepath: %w", referenceStr, err)
}
references[i] = referenceStorePath.Digest
}
// construct the narInfo.Signatures[*] from pathInfo.Narinfo.Signatures[*]
narinfoSignatures := make([]*storev1pb.NARInfo_Signature, len(narInfo.Signatures))
for i, narinfoSig := range narInfo.Signatures {
narinfoSignatures[i] = &storev1pb.NARInfo_Signature{
Name: narinfoSig.Name,
Data: narinfoSig.Data,
}
}
// assemble the PathInfo.
pathInfo := &storev1pb.PathInfo{
// embed a new root node with the name set to the store path basename.
Node: castorev1pb.RenamedNode(rootNode, storePath.String()),
References: references,
Narinfo: &storev1pb.NARInfo{
NarSize: narInfo.NarSize,
NarSha256: narInfo.FileHash.Digest(),
Signatures: narinfoSignatures,
ReferenceNames: narInfo.References,
},
}
// run Validate on the PathInfo, more as an additional sanity check our code is sound,
// to make sure we populated everything properly, before returning it.
// Fail hard if we fail validation, this is a code error.
if _, err = pathInfo.Validate(); err != nil {
panic(fmt.Sprintf("PathInfo failed validation: %v", err))
}
return pathInfo, nil
}
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