Upgrade to 0.12

1 files changed, 209 insertions, 0 deletions

diff --git a/vendor/github.com/hashicorp/terraform/states/statefile/read.go b/vendor/github.com/hashicorp/terraform/states/statefile/read.go
new file mode 100644
index 0000000..d691c02
--- /dev/null
+++ b/vendor/github.com/hashicorp/terraform/states/statefile/read.go
@@ -0,0 +1,209 @@
+package statefile
+
+import (
+        "encoding/json"
+        "errors"
+        "fmt"
+        "io"
+        "io/ioutil"
+        "os"
+
+        version "github.com/hashicorp/go-version"
+
+        "github.com/hashicorp/terraform/tfdiags"
+        tfversion "github.com/hashicorp/terraform/version"
+)
+
+// ErrNoState is returned by ReadState when the state file is empty.
+var ErrNoState = errors.New("no state")
+
+// Read reads a state from the given reader.
+//
+// Legacy state format versions 1 through 3 are supported, but the result will
+// contain object attributes in the deprecated "flatmap" format and so must
+// be upgraded by the caller before use.
+//
+// If the state file is empty, the special error value ErrNoState is returned.
+// Otherwise, the returned error might be a wrapper around tfdiags.Diagnostics
+// potentially describing multiple errors.
+func Read(r io.Reader) (*File, error) {
+        // Some callers provide us a "typed nil" *os.File here, which would
+        // cause us to panic below if we tried to use it.
+        if f, ok := r.(*os.File); ok && f == nil {
+                return nil, ErrNoState
+        }
+
+        var diags tfdiags.Diagnostics
+
+        // We actually just buffer the whole thing in memory, because states are
+        // generally not huge and we need to do be able to sniff for a version
+        // number before full parsing.
+        src, err := ioutil.ReadAll(r)
+        if err != nil {
+                diags = diags.Append(tfdiags.Sourceless(
+                        tfdiags.Error,
+                        "Failed to read state file",
+                        fmt.Sprintf("The state file could not be read: %s", err),
+                ))
+                return nil, diags.Err()
+        }
+
+        if len(src) == 0 {
+                return nil, ErrNoState
+        }
+
+        state, diags := readState(src)
+        if diags.HasErrors() {
+                return nil, diags.Err()
+        }
+
+        if state == nil {
+                // Should never happen
+                panic("readState returned nil state with no errors")
+        }
+
+        if state.TerraformVersion != nil && state.TerraformVersion.GreaterThan(tfversion.SemVer) {
+                return state, fmt.Errorf(
+                        "state snapshot was created by Terraform v%s, which is newer than current v%s; upgrade to Terraform v%s or greater to work with this state",
+                        state.TerraformVersion,
+                        tfversion.SemVer,
+                        state.TerraformVersion,
+                )
+        }
+
+        return state, diags.Err()
+}
+
+func readState(src []byte) (*File, tfdiags.Diagnostics) {
+        var diags tfdiags.Diagnostics
+
+        if looksLikeVersion0(src) {
+                diags = diags.Append(tfdiags.Sourceless(
+                        tfdiags.Error,
+                        unsupportedFormat,
+                        "The state is stored in a legacy binary format that is not supported since Terraform v0.7. To continue, first upgrade the state using Terraform 0.6.16 or earlier.",
+                ))
+                return nil, diags
+        }
+
+        version, versionDiags := sniffJSONStateVersion(src)
+        diags = diags.Append(versionDiags)
+        if versionDiags.HasErrors() {
+                return nil, diags
+        }
+
+        switch version {
+        case 0:
+                diags = diags.Append(tfdiags.Sourceless(
+                        tfdiags.Error,
+                        unsupportedFormat,
+                        "The state file uses JSON syntax but has a version number of zero. There was never a JSON-based state format zero, so this state file is invalid and cannot be processed.",
+                ))
+                return nil, diags
+        case 1:
+                return readStateV1(src)
+        case 2:
+                return readStateV2(src)
+        case 3:
+                return readStateV3(src)
+        case 4:
+                return readStateV4(src)
+        default:
+                thisVersion := tfversion.SemVer.String()
+                creatingVersion := sniffJSONStateTerraformVersion(src)
+                switch {
+                case creatingVersion != "":
+                        diags = diags.Append(tfdiags.Sourceless(
+                                tfdiags.Error,
+                                unsupportedFormat,
+                                fmt.Sprintf("The state file uses format version %d, which is not supported by Terraform %s. This state file was created by Terraform %s.", version, thisVersion, creatingVersion),
+                        ))
+                default:
+                        diags = diags.Append(tfdiags.Sourceless(
+                                tfdiags.Error,
+                                unsupportedFormat,
+                                fmt.Sprintf("The state file uses format version %d, which is not supported by Terraform %s. This state file may have been created by a newer version of Terraform.", version, thisVersion),
+                        ))
+                }
+                return nil, diags
+        }
+}
+
+func sniffJSONStateVersion(src []byte) (uint64, tfdiags.Diagnostics) {
+        var diags tfdiags.Diagnostics
+
+        type VersionSniff struct {
+                Version *uint64 `json:"version"`
+        }
+        var sniff VersionSniff
+        err := json.Unmarshal(src, &sniff)
+        if err != nil {
+                switch tErr := err.(type) {
+                case *json.SyntaxError:
+                        diags = diags.Append(tfdiags.Sourceless(
+                                tfdiags.Error,
+                                unsupportedFormat,
+                                fmt.Sprintf("The state file could not be parsed as JSON: syntax error at byte offset %d.", tErr.Offset),
+                        ))
+                case *json.UnmarshalTypeError:
+                        diags = diags.Append(tfdiags.Sourceless(
+                                tfdiags.Error,
+                                unsupportedFormat,
+                                fmt.Sprintf("The version in the state file is %s. A positive whole number is required.", tErr.Value),
+                        ))
+                default:
+                        diags = diags.Append(tfdiags.Sourceless(
+                                tfdiags.Error,
+                                unsupportedFormat,
+                                "The state file could not be parsed as JSON.",
+                        ))
+                }
+        }
+
+        if sniff.Version == nil {
+                diags = diags.Append(tfdiags.Sourceless(
+                        tfdiags.Error,
+                        unsupportedFormat,
+                        "The state file does not have a \"version\" attribute, which is required to identify the format version.",
+                ))
+                return 0, diags
+        }
+
+        return *sniff.Version, diags
+}
+
+// sniffJSONStateTerraformVersion attempts to sniff the Terraform version
+// specification from the given state file source code. The result is either
+// a version string or an empty string if no version number could be extracted.
+//
+// This is a best-effort function intended to produce nicer error messages. It
+// should not be used for any real processing.
+func sniffJSONStateTerraformVersion(src []byte) string {
+        type VersionSniff struct {
+                Version string `json:"terraform_version"`
+        }
+        var sniff VersionSniff
+
+        err := json.Unmarshal(src, &sniff)
+        if err != nil {
+                return ""
+        }
+
+        // Attempt to parse the string as a version so we won't report garbage
+        // as a version number.
+        _, err = version.NewVersion(sniff.Version)
+        if err != nil {
+                return ""
+        }
+
+        return sniff.Version
+}
+
+// unsupportedFormat is a diagnostic summary message for when the state file
+// seems to not be a state file at all, or is not a supported version.
+//
+// Use invalidFormat instead for the subtly-different case of "this looks like
+// it's intended to be a state file but it's not structured correctly".
+const unsupportedFormat = "Unsupported state file format"
+
+const upgradeFailed = "State format upgrade failed"