From c680a8e1622ed0f18751d9d167c836ee24f5e897 Mon Sep 17 00:00:00 2001
From: Radek Simko <radek.simko@gmail.com>
Date: Thu, 10 Aug 2017 14:38:14 +0200
Subject: vendor: github.com/hashicorp/terraform/...@v0.10.0

---
 .../terraform/plugin/discovery/requirements.go     | 105 +++++++++++++++++++++
 1 file changed, 105 insertions(+)
 create mode 100644 vendor/github.com/hashicorp/terraform/plugin/discovery/requirements.go

(limited to 'vendor/github.com/hashicorp/terraform/plugin/discovery/requirements.go')

diff --git a/vendor/github.com/hashicorp/terraform/plugin/discovery/requirements.go b/vendor/github.com/hashicorp/terraform/plugin/discovery/requirements.go
new file mode 100644
index 0000000..75430fd
--- /dev/null
+++ b/vendor/github.com/hashicorp/terraform/plugin/discovery/requirements.go
@@ -0,0 +1,105 @@
+package discovery
+
+import (
+	"bytes"
+)
+
+// PluginRequirements describes a set of plugins (assumed to be of a consistent
+// kind) that are required to exist and have versions within the given
+// corresponding sets.
+type PluginRequirements map[string]*PluginConstraints
+
+// PluginConstraints represents an element of PluginRequirements describing
+// the constraints for a single plugin.
+type PluginConstraints struct {
+	// Specifies that the plugin's version must be within the given
+	// constraints.
+	Versions Constraints
+
+	// If non-nil, the hash of the on-disk plugin executable must exactly
+	// match the SHA256 hash given here.
+	SHA256 []byte
+}
+
+// Allows returns true if the given version is within the receiver's version
+// constraints.
+func (s *PluginConstraints) Allows(v Version) bool {
+	return s.Versions.Allows(v)
+}
+
+// AcceptsSHA256 returns true if the given executable SHA256 hash is acceptable,
+// either because it matches the constraint or because there is no such
+// constraint.
+func (s *PluginConstraints) AcceptsSHA256(digest []byte) bool {
+	if s.SHA256 == nil {
+		return true
+	}
+	return bytes.Equal(s.SHA256, digest)
+}
+
+// Merge takes the contents of the receiver and the other given requirements
+// object and merges them together into a single requirements structure
+// that satisfies both sets of requirements.
+//
+// Note that it doesn't make sense to merge two PluginRequirements with
+// differing required plugin SHA256 hashes, since the result will never
+// match any plugin.
+func (r PluginRequirements) Merge(other PluginRequirements) PluginRequirements {
+	ret := make(PluginRequirements)
+	for n, c := range r {
+		ret[n] = &PluginConstraints{
+			Versions: Constraints{}.Append(c.Versions),
+			SHA256:   c.SHA256,
+		}
+	}
+	for n, c := range other {
+		if existing, exists := ret[n]; exists {
+			ret[n].Versions = ret[n].Versions.Append(c.Versions)
+
+			if existing.SHA256 != nil {
+				if c.SHA256 != nil && !bytes.Equal(c.SHA256, existing.SHA256) {
+					// If we've been asked to merge two constraints with
+					// different SHA256 hashes then we'll produce a dummy value
+					// that can never match anything. This is a silly edge case
+					// that no reasonable caller should hit.
+					ret[n].SHA256 = []byte(invalidProviderHash)
+				}
+			} else {
+				ret[n].SHA256 = c.SHA256 // might still be nil
+			}
+		} else {
+			ret[n] = &PluginConstraints{
+				Versions: Constraints{}.Append(c.Versions),
+				SHA256:   c.SHA256,
+			}
+		}
+	}
+	return ret
+}
+
+// LockExecutables applies additional constraints to the receiver that
+// require plugin executables with specific SHA256 digests. This modifies
+// the receiver in-place, since it's intended to be applied after
+// version constraints have been resolved.
+//
+// The given map must include a key for every plugin that is already
+// required. If not, any missing keys will cause the corresponding plugin
+// to never match, though the direct caller doesn't necessarily need to
+// guarantee this as long as the downstream code _applying_ these constraints
+// is able to deal with the non-match in some way.
+func (r PluginRequirements) LockExecutables(sha256s map[string][]byte) {
+	for name, cons := range r {
+		digest := sha256s[name]
+
+		if digest == nil {
+			// Prevent any match, which will then presumably cause the
+			// downstream consumer of this requirements to report an error.
+			cons.SHA256 = []byte(invalidProviderHash)
+			continue
+		}
+
+		cons.SHA256 = digest
+	}
+}
+
+const invalidProviderHash = "<invalid>"
-- 
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