github.com/graywolf-at-work-2/terraform-vendor@v1.4.5/internal/states/statefile/marshal_equal.go (about)

     1  package statefile
     2  
     3  import (
     4  	"bytes"
     5  
     6  	"github.com/hashicorp/terraform/internal/states"
     7  )
     8  
     9  // StatesMarshalEqual returns true if and only if the two given states have
    10  // an identical (byte-for-byte) statefile representation.
    11  //
    12  // This function compares only the portions of the state that are persisted
    13  // in state files, so for example it will not return false if the only
    14  // differences between the two states are local values or descendent module
    15  // outputs.
    16  func StatesMarshalEqual(a, b *states.State) bool {
    17  	var aBuf bytes.Buffer
    18  	var bBuf bytes.Buffer
    19  
    20  	// nil states are not valid states, and so they can never martial equal.
    21  	if a == nil || b == nil {
    22  		return false
    23  	}
    24  
    25  	// We write here some temporary files that have no header information
    26  	// populated, thus ensuring that we're only comparing the state itself
    27  	// and not any metadata.
    28  	err := Write(&File{State: a}, &aBuf)
    29  	if err != nil {
    30  		// Should never happen, because we're writing to an in-memory buffer
    31  		panic(err)
    32  	}
    33  	err = Write(&File{State: b}, &bBuf)
    34  	if err != nil {
    35  		// Should never happen, because we're writing to an in-memory buffer
    36  		panic(err)
    37  	}
    38  
    39  	return bytes.Equal(aBuf.Bytes(), bBuf.Bytes())
    40  }