syntax = "proto3";

package pb;

message Op {
	repeated Input inputs = 1;
	oneof op {
		ExecOp exec = 2;
		SourceOp source = 3;
		CopyOp copy = 4;
	 }
}

message Input {
	string digest = 1;
	int64 index = 2;
}

message ExecOp {
	Meta meta = 1;
	repeated Mount mounts = 2;
}

message Meta {
	repeated string args = 1;
	repeated string env = 2;
	string cwd = 3;
}

message Mount {
	int64 input = 1;
	string selector = 2;
	string dest = 3;
	int64 output = 4;
}

message CopyOp {
	repeated CopySource src = 1;
	string dest = 2;
}

message CopySource {
	int64 input = 1;
	string selector = 2;
}

message SourceOp {
	string identifier = 1;
}