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// SPDX-FileCopyrightText: edef <edef@unfathomable.blue>
// SPDX-License-Identifier: OSL-3.0 OR MIT OR Apache-2.0
syntax = "proto3";
package tvix.castore.v1;
option go_package = "code.tvl.fyi/tvix/castore-go;castorev1";
// A Directory can contain Directory, File or Symlink nodes.
// Each of these nodes have a name attribute, which is the basename in that
// directory and node type specific attributes.
// The name attribute:
// - MUST not contain slashes or null bytes
// - MUST not be '.' or '..'
// - MUST be unique across all three lists
// Elements in each list need to be lexicographically ordered by the name
// attribute.
message Directory {
repeated DirectoryNode directories = 1;
repeated FileNode files = 2;
repeated SymlinkNode symlinks = 3;
}
// A DirectoryNode represents a directory in a Directory.
message DirectoryNode {
// The (base)name of the directory
bytes name = 1;
// The blake3 hash of a Directory message, serialized in protobuf canonical form.
bytes digest = 2;
// Number of child elements in the Directory referred to by `digest`.
// Calculated by summing up the numbers of `directories`, `files` and
// `symlinks`, and for each directory, its size field. Used for inode number
// calculation.
// This field is precisely as verifiable as any other Merkle tree edge.
// Resolve `digest`, and you can compute it incrementally. Resolve the entire
// tree, and you can fully compute it from scratch.
// A credulous implementation won't reject an excessive size, but this is
// harmless: you'll have some ordinals without nodes. Undersizing is obvious
// and easy to reject: you won't have an ordinal for some nodes.
uint64 size = 3;
}
// A FileNode represents a regular or executable file in a Directory.
message FileNode {
// The (base)name of the file
bytes name = 1;
// The blake3 digest of the file contents
bytes digest = 2;
// The file content size
uint64 size = 3;
// Whether the file is executable
bool executable = 4;
}
// A SymlinkNode represents a symbolic link in a Directory.
message SymlinkNode {
// The (base)name of the symlink
bytes name = 1;
// The target of the symlink.
bytes target = 2;
}
// A Node is either a DirectoryNode, FileNode or SymlinkNode.
message Node {
oneof node {
DirectoryNode directory = 1;
FileNode file = 2;
SymlinkNode symlink = 3;
}
}
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