Initial transfer of provider code

5 files changed, 922 insertions, 0 deletions

diff --git a/vendor/github.com/hashicorp/go-version/LICENSE b/vendor/github.com/hashicorp/go-version/LICENSE
new file mode 100644
index 0000000..c33dcc7
--- /dev/null
+++ b/vendor/github.com/hashicorp/go-version/LICENSE
@@ -0,0 +1,354 @@
+Mozilla Public License, version 2.0
+
+1. Definitions
+
+1.1. “Contributor”
+
+     means each individual or legal entity that creates, contributes to the
+     creation of, or owns Covered Software.
+
+1.2. “Contributor Version”
+
+     means the combination of the Contributions of others (if any) used by a
+     Contributor and that particular Contributor’s Contribution.
+
+1.3. “Contribution”
+
+     means Covered Software of a particular Contributor.
+
+1.4. “Covered Software”
+
+     means Source Code Form to which the initial Contributor has attached the
+     notice in Exhibit A, the Executable Form of such Source Code Form, and
+     Modifications of such Source Code Form, in each case including portions
+     thereof.
+
+1.5. “Incompatible With Secondary Licenses”
+     means
+
+     a. that the initial Contributor has attached the notice described in
+        Exhibit B to the Covered Software; or
+
+     b. that the Covered Software was made available under the terms of version
+        1.1 or earlier of the License, but not also under the terms of a
+        Secondary License.
+
+1.6. “Executable Form”
+
+     means any form of the work other than Source Code Form.
+
+1.7. “Larger Work”
+
+     means a work that combines Covered Software with other material, in a separate
+     file or files, that is not Covered Software.
+
+1.8. “License”
+
+     means this document.
+
+1.9. “Licensable”
+
+     means having the right to grant, to the maximum extent possible, whether at the
+     time of the initial grant or subsequently, any and all of the rights conveyed by
+     this License.
+
+1.10. “Modifications”
+
+     means any of the following:
+
+     a. any file in Source Code Form that results from an addition to, deletion
+        from, or modification of the contents of Covered Software; or
+
+     b. any new file in Source Code Form that contains any Covered Software.
+
+1.11. “Patent Claims” of a Contributor
+
+      means any patent claim(s), including without limitation, method, process,
+      and apparatus claims, in any patent Licensable by such Contributor that
+      would be infringed, but for the grant of the License, by the making,
+      using, selling, offering for sale, having made, import, or transfer of
+      either its Contributions or its Contributor Version.
+
+1.12. “Secondary License”
+
+      means either the GNU General Public License, Version 2.0, the GNU Lesser
+      General Public License, Version 2.1, the GNU Affero General Public
+      License, Version 3.0, or any later versions of those licenses.
+
+1.13. “Source Code Form”
+
+      means the form of the work preferred for making modifications.
+
+1.14. “You” (or “Your”)
+
+      means an individual or a legal entity exercising rights under this
+      License. For legal entities, “You” includes any entity that controls, is
+      controlled by, or is under common control with You. For purposes of this
+      definition, “control” means (a) the power, direct or indirect, to cause
+      the direction or management of such entity, whether by contract or
+      otherwise, or (b) ownership of more than fifty percent (50%) of the
+      outstanding shares or beneficial ownership of such entity.
+
+
+2. License Grants and Conditions
+
+2.1. Grants
+
+     Each Contributor hereby grants You a world-wide, royalty-free,
+     non-exclusive license:
+
+     a. under intellectual property rights (other than patent or trademark)
+        Licensable by such Contributor to use, reproduce, make available,
+        modify, display, perform, distribute, and otherwise exploit its
+        Contributions, either on an unmodified basis, with Modifications, or as
+        part of a Larger Work; and
+
+     b. under Patent Claims of such Contributor to make, use, sell, offer for
+        sale, have made, import, and otherwise transfer either its Contributions
+        or its Contributor Version.
+
+2.2. Effective Date
+
+     The licenses granted in Section 2.1 with respect to any Contribution become
+     effective for each Contribution on the date the Contributor first distributes
+     such Contribution.
+
+2.3. Limitations on Grant Scope
+
+     The licenses granted in this Section 2 are the only rights granted under this
+     License. No additional rights or licenses will be implied from the distribution
+     or licensing of Covered Software under this License. Notwithstanding Section
+     2.1(b) above, no patent license is granted by a Contributor:
+
+     a. for any code that a Contributor has removed from Covered Software; or
+
+     b. for infringements caused by: (i) Your and any other third party’s
+        modifications of Covered Software, or (ii) the combination of its
+        Contributions with other software (except as part of its Contributor
+        Version); or
+
+     c. under Patent Claims infringed by Covered Software in the absence of its
+        Contributions.
+
+     This License does not grant any rights in the trademarks, service marks, or
+     logos of any Contributor (except as may be necessary to comply with the
+     notice requirements in Section 3.4).
+
+2.4. Subsequent Licenses
+
+     No Contributor makes additional grants as a result of Your choice to
+     distribute the Covered Software under a subsequent version of this License
+     (see Section 10.2) or under the terms of a Secondary License (if permitted
+     under the terms of Section 3.3).
+
+2.5. Representation
+
+     Each Contributor represents that the Contributor believes its Contributions
+     are its original creation(s) or it has sufficient rights to grant the
+     rights to its Contributions conveyed by this License.
+
+2.6. Fair Use
+
+     This License is not intended to limit any rights You have under applicable
+     copyright doctrines of fair use, fair dealing, or other equivalents.
+
+2.7. Conditions
+
+     Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted in
+     Section 2.1.
+
+
+3. Responsibilities
+
+3.1. Distribution of Source Form
+
+     All distribution of Covered Software in Source Code Form, including any
+     Modifications that You create or to which You contribute, must be under the
+     terms of this License. You must inform recipients that the Source Code Form
+     of the Covered Software is governed by the terms of this License, and how
+     they can obtain a copy of this License. You may not attempt to alter or
+     restrict the recipients’ rights in the Source Code Form.
+
+3.2. Distribution of Executable Form
+
+     If You distribute Covered Software in Executable Form then:
+
+     a. such Covered Software must also be made available in Source Code Form,
+        as described in Section 3.1, and You must inform recipients of the
+        Executable Form how they can obtain a copy of such Source Code Form by
+        reasonable means in a timely manner, at a charge no more than the cost
+        of distribution to the recipient; and
+
+     b. You may distribute such Executable Form under the terms of this License,
+        or sublicense it under different terms, provided that the license for
+        the Executable Form does not attempt to limit or alter the recipients’
+        rights in the Source Code Form under this License.
+
+3.3. Distribution of a Larger Work
+
+     You may create and distribute a Larger Work under terms of Your choice,
+     provided that You also comply with the requirements of this License for the
+     Covered Software. If the Larger Work is a combination of Covered Software
+     with a work governed by one or more Secondary Licenses, and the Covered
+     Software is not Incompatible With Secondary Licenses, this License permits
+     You to additionally distribute such Covered Software under the terms of
+     such Secondary License(s), so that the recipient of the Larger Work may, at
+     their option, further distribute the Covered Software under the terms of
+     either this License or such Secondary License(s).
+
+3.4. Notices
+
+     You may not remove or alter the substance of any license notices (including
+     copyright notices, patent notices, disclaimers of warranty, or limitations
+     of liability) contained within the Source Code Form of the Covered
+     Software, except that You may alter any license notices to the extent
+     required to remedy known factual inaccuracies.
+
+3.5. Application of Additional Terms
+
+     You may choose to offer, and to charge a fee for, warranty, support,
+     indemnity or liability obligations to one or more recipients of Covered
+     Software. However, You may do so only on Your own behalf, and not on behalf
+     of any Contributor. You must make it absolutely clear that any such
+     warranty, support, indemnity, or liability obligation is offered by You
+     alone, and You hereby agree to indemnify every Contributor for any
+     liability incurred by such Contributor as a result of warranty, support,
+     indemnity or liability terms You offer. You may include additional
+     disclaimers of warranty and limitations of liability specific to any
+     jurisdiction.
+
+4. Inability to Comply Due to Statute or Regulation
+
+   If it is impossible for You to comply with any of the terms of this License
+   with respect to some or all of the Covered Software due to statute, judicial
+   order, or regulation then You must: (a) comply with the terms of this License
+   to the maximum extent possible; and (b) describe the limitations and the code
+   they affect. Such description must be placed in a text file included with all
+   distributions of the Covered Software under this License. Except to the
+   extent prohibited by statute or regulation, such description must be
+   sufficiently detailed for a recipient of ordinary skill to be able to
+   understand it.
+
+5. Termination
+
+5.1. The rights granted under this License will terminate automatically if You
+     fail to comply with any of its terms. However, if You become compliant,
+     then the rights granted under this License from a particular Contributor
+     are reinstated (a) provisionally, unless and until such Contributor
+     explicitly and finally terminates Your grants, and (b) on an ongoing basis,
+     if such Contributor fails to notify You of the non-compliance by some
+     reasonable means prior to 60 days after You have come back into compliance.
+     Moreover, Your grants from a particular Contributor are reinstated on an
+     ongoing basis if such Contributor notifies You of the non-compliance by
+     some reasonable means, this is the first time You have received notice of
+     non-compliance with this License from such Contributor, and You become
+     compliant prior to 30 days after Your receipt of the notice.
+
+5.2. If You initiate litigation against any entity by asserting a patent
+     infringement claim (excluding declaratory judgment actions, counter-claims,
+     and cross-claims) alleging that a Contributor Version directly or
+     indirectly infringes any patent, then the rights granted to You by any and
+     all Contributors for the Covered Software under Section 2.1 of this License
+     shall terminate.
+
+5.3. In the event of termination under Sections 5.1 or 5.2 above, all end user
+     license agreements (excluding distributors and resellers) which have been
+     validly granted by You or Your distributors under this License prior to
+     termination shall survive termination.
+
+6. Disclaimer of Warranty
+
+   Covered Software is provided under this License on an “as is” basis, without
+   warranty of any kind, either expressed, implied, or statutory, including,
+   without limitation, warranties that the Covered Software is free of defects,
+   merchantable, fit for a particular purpose or non-infringing. The entire
+   risk as to the quality and performance of the Covered Software is with You.
+   Should any Covered Software prove defective in any respect, You (not any
+   Contributor) assume the cost of any necessary servicing, repair, or
+   correction. This disclaimer of warranty constitutes an essential part of this
+   License. No use of  any Covered Software is authorized under this License
+   except under this disclaimer.
+
+7. Limitation of Liability
+
+   Under no circumstances and under no legal theory, whether tort (including
+   negligence), contract, or otherwise, shall any Contributor, or anyone who
+   distributes Covered Software as permitted above, be liable to You for any
+   direct, indirect, special, incidental, or consequential damages of any
+   character including, without limitation, damages for lost profits, loss of
+   goodwill, work stoppage, computer failure or malfunction, or any and all
+   other commercial damages or losses, even if such party shall have been
+   informed of the possibility of such damages. This limitation of liability
+   shall not apply to liability for death or personal injury resulting from such
+   party’s negligence to the extent applicable law prohibits such limitation.
+   Some jurisdictions do not allow the exclusion or limitation of incidental or
+   consequential damages, so this exclusion and limitation may not apply to You.
+
+8. Litigation
+
+   Any litigation relating to this License may be brought only in the courts of
+   a jurisdiction where the defendant maintains its principal place of business
+   and such litigation shall be governed by laws of that jurisdiction, without
+   reference to its conflict-of-law provisions. Nothing in this Section shall
+   prevent a party’s ability to bring cross-claims or counter-claims.
+
+9. Miscellaneous
+
+   This License represents the complete agreement concerning the subject matter
+   hereof. If any provision of this License is held to be unenforceable, such
+   provision shall be reformed only to the extent necessary to make it
+   enforceable. Any law or regulation which provides that the language of a
+   contract shall be construed against the drafter shall not be used to construe
+   this License against a Contributor.
+
+
+10. Versions of the License
+
+10.1. New Versions
+
+      Mozilla Foundation is the license steward. Except as provided in Section
+      10.3, no one other than the license steward has the right to modify or
+      publish new versions of this License. Each version will be given a
+      distinguishing version number.
+
+10.2. Effect of New Versions
+
+      You may distribute the Covered Software under the terms of the version of
+      the License under which You originally received the Covered Software, or
+      under the terms of any subsequent version published by the license
+      steward.
+
+10.3. Modified Versions
+
+      If you create software not governed by this License, and you want to
+      create a new license for such software, you may create and use a modified
+      version of this License if you rename the license and remove any
+      references to the name of the license steward (except to note that such
+      modified license differs from this License).
+
+10.4. Distributing Source Code Form that is Incompatible With Secondary Licenses
+      If You choose to distribute Source Code Form that is Incompatible With
+      Secondary Licenses under the terms of this version of the License, the
+      notice described in Exhibit B of this License must be attached.
+
+Exhibit A - Source Code Form License Notice
+
+      This Source Code Form is subject to the
+      terms of the Mozilla Public License, v.
+      2.0. If a copy of the MPL was not
+      distributed with this file, You can
+      obtain one at
+      http://mozilla.org/MPL/2.0/.
+
+If it is not possible or desirable to put the notice in a particular file, then
+You may include the notice in a location (such as a LICENSE file in a relevant
+directory) where a recipient would be likely to look for such a notice.
+
+You may add additional accurate notices of copyright ownership.
+
+Exhibit B - “Incompatible With Secondary Licenses” Notice
+
+      This Source Code Form is “Incompatible
+      With Secondary Licenses”, as defined by
+      the Mozilla Public License, v. 2.0.
+
diff --git a/vendor/github.com/hashicorp/go-version/README.md b/vendor/github.com/hashicorp/go-version/README.md
new file mode 100644
index 0000000..6f3a15c
--- /dev/null
+++ b/vendor/github.com/hashicorp/go-version/README.md
@@ -0,0 +1,65 @@
+# Versioning Library for Go
+[![Build Status](https://travis-ci.org/hashicorp/go-version.svg?branch=master)](https://travis-ci.org/hashicorp/go-version)
+
+go-version is a library for parsing versions and version constraints,
+and verifying versions against a set of constraints. go-version
+can sort a collection of versions properly, handles prerelease/beta
+versions, can increment versions, etc.
+
+Versions used with go-version must follow [SemVer](http://semver.org/).
+
+## Installation and Usage
+
+Package documentation can be found on
+[GoDoc](http://godoc.org/github.com/hashicorp/go-version).
+
+Installation can be done with a normal `go get`:
+
+```
+$ go get github.com/hashicorp/go-version
+```
+
+#### Version Parsing and Comparison
+
+```go
+v1, err := version.NewVersion("1.2")
+v2, err := version.NewVersion("1.5+metadata")
+
+// Comparison example. There is also GreaterThan, Equal, and just
+// a simple Compare that returns an int allowing easy >=, <=, etc.
+if v1.LessThan(v2) {
+    fmt.Printf("%s is less than %s", v1, v2)
+}
+```
+
+#### Version Constraints
+
+```go
+v1, err := version.NewVersion("1.2")
+
+// Constraints example.
+constraints, err := version.NewConstraint(">= 1.0, < 1.4")
+if constraints.Check(v1) {
+        fmt.Printf("%s satisfies constraints %s", v1, constraints)
+}
+```
+
+#### Version Sorting
+
+```go
+versionsRaw := []string{"1.1", "0.7.1", "1.4-beta", "1.4", "2"}
+versions := make([]*version.Version, len(versionsRaw))
+for i, raw := range versionsRaw {
+    v, _ := version.NewVersion(raw)
+    versions[i] = v
+}
+
+// After this, the versions are properly sorted
+sort.Sort(version.Collection(versions))
+```
+
+## Issues and Contributing
+
+If you find an issue with this library, please report an issue. If you'd
+like, we welcome any contributions. Fork this library and submit a pull
+request.
diff --git a/vendor/github.com/hashicorp/go-version/constraint.go b/vendor/github.com/hashicorp/go-version/constraint.go
new file mode 100644
index 0000000..8c73df0
--- /dev/null
+++ b/vendor/github.com/hashicorp/go-version/constraint.go
@@ -0,0 +1,178 @@
+package version
+
+import (
+        "fmt"
+        "regexp"
+        "strings"
+)
+
+// Constraint represents a single constraint for a version, such as
+// ">= 1.0".
+type Constraint struct {
+        f        constraintFunc
+        check    *Version
+        original string
+}
+
+// Constraints is a slice of constraints. We make a custom type so that
+// we can add methods to it.
+type Constraints []*Constraint
+
+type constraintFunc func(v, c *Version) bool
+
+var constraintOperators map[string]constraintFunc
+
+var constraintRegexp *regexp.Regexp
+
+func init() {
+        constraintOperators = map[string]constraintFunc{
+                "":   constraintEqual,
+                "=":  constraintEqual,
+                "!=": constraintNotEqual,
+                ">":  constraintGreaterThan,
+                "<":  constraintLessThan,
+                ">=": constraintGreaterThanEqual,
+                "<=": constraintLessThanEqual,
+                "~>": constraintPessimistic,
+        }
+
+        ops := make([]string, 0, len(constraintOperators))
+        for k := range constraintOperators {
+                ops = append(ops, regexp.QuoteMeta(k))
+        }
+
+        constraintRegexp = regexp.MustCompile(fmt.Sprintf(
+                `^\s*(%s)\s*(%s)\s*$`,
+                strings.Join(ops, "|"),
+                VersionRegexpRaw))
+}
+
+// NewConstraint will parse one or more constraints from the given
+// constraint string. The string must be a comma-separated list of
+// constraints.
+func NewConstraint(v string) (Constraints, error) {
+        vs := strings.Split(v, ",")
+        result := make([]*Constraint, len(vs))
+        for i, single := range vs {
+                c, err := parseSingle(single)
+                if err != nil {
+                        return nil, err
+                }
+
+                result[i] = c
+        }
+
+        return Constraints(result), nil
+}
+
+// Check tests if a version satisfies all the constraints.
+func (cs Constraints) Check(v *Version) bool {
+        for _, c := range cs {
+                if !c.Check(v) {
+                        return false
+                }
+        }
+
+        return true
+}
+
+// Returns the string format of the constraints
+func (cs Constraints) String() string {
+        csStr := make([]string, len(cs))
+        for i, c := range cs {
+                csStr[i] = c.String()
+        }
+
+        return strings.Join(csStr, ",")
+}
+
+// Check tests if a constraint is validated by the given version.
+func (c *Constraint) Check(v *Version) bool {
+        return c.f(v, c.check)
+}
+
+func (c *Constraint) String() string {
+        return c.original
+}
+
+func parseSingle(v string) (*Constraint, error) {
+        matches := constraintRegexp.FindStringSubmatch(v)
+        if matches == nil {
+                return nil, fmt.Errorf("Malformed constraint: %s", v)
+        }
+
+        check, err := NewVersion(matches[2])
+        if err != nil {
+                return nil, err
+        }
+
+        return &Constraint{
+                f:        constraintOperators[matches[1]],
+                check:    check,
+                original: v,
+        }, nil
+}
+
+//-------------------------------------------------------------------
+// Constraint functions
+//-------------------------------------------------------------------
+
+func constraintEqual(v, c *Version) bool {
+        return v.Equal(c)
+}
+
+func constraintNotEqual(v, c *Version) bool {
+        return !v.Equal(c)
+}
+
+func constraintGreaterThan(v, c *Version) bool {
+        return v.Compare(c) == 1
+}
+
+func constraintLessThan(v, c *Version) bool {
+        return v.Compare(c) == -1
+}
+
+func constraintGreaterThanEqual(v, c *Version) bool {
+        return v.Compare(c) >= 0
+}
+
+func constraintLessThanEqual(v, c *Version) bool {
+        return v.Compare(c) <= 0
+}
+
+func constraintPessimistic(v, c *Version) bool {
+        // If the version being checked is naturally less than the constraint, then there
+        // is no way for the version to be valid against the constraint
+        if v.LessThan(c) {
+                return false
+        }
+        // We'll use this more than once, so grab the length now so it's a little cleaner
+        // to write the later checks
+        cs := len(c.segments)
+
+        // If the version being checked has less specificity than the constraint, then there
+        // is no way for the version to be valid against the constraint
+        if cs > len(v.segments) {
+                return false
+        }
+
+        // Check the segments in the constraint against those in the version. If the version
+        // being checked, at any point, does not have the same values in each index of the
+        // constraints segments, then it cannot be valid against the constraint.
+        for i := 0; i < c.si-1; i++ {
+                if v.segments[i] != c.segments[i] {
+                        return false
+                }
+        }
+
+        // Check the last part of the segment in the constraint. If the version segment at
+        // this index is less than the constraints segment at this index, then it cannot
+        // be valid against the constraint
+        if c.segments[cs-1] > v.segments[cs-1] {
+                return false
+        }
+
+        // If nothing has rejected the version by now, it's valid
+        return true
+}
diff --git a/vendor/github.com/hashicorp/go-version/version.go b/vendor/github.com/hashicorp/go-version/version.go
new file mode 100644
index 0000000..ae2f6b6
--- /dev/null
+++ b/vendor/github.com/hashicorp/go-version/version.go
@@ -0,0 +1,308 @@
+package version
+
+import (
+        "bytes"
+        "fmt"
+        "reflect"
+        "regexp"
+        "strconv"
+        "strings"
+)
+
+// The compiled regular expression used to test the validity of a version.
+var versionRegexp *regexp.Regexp
+
+// The raw regular expression string used for testing the validity
+// of a version.
+const VersionRegexpRaw string = `v?([0-9]+(\.[0-9]+)*?)` +
+        `(-?([0-9A-Za-z\-]+(\.[0-9A-Za-z\-]+)*))?` +
+        `(\+([0-9A-Za-z\-]+(\.[0-9A-Za-z\-]+)*))?` +
+        `?`
+
+// Version represents a single version.
+type Version struct {
+        metadata string
+        pre      string
+        segments []int64
+        si       int
+}
+
+func init() {
+        versionRegexp = regexp.MustCompile("^" + VersionRegexpRaw + "$")
+}
+
+// NewVersion parses the given version and returns a new
+// Version.
+func NewVersion(v string) (*Version, error) {
+        matches := versionRegexp.FindStringSubmatch(v)
+        if matches == nil {
+                return nil, fmt.Errorf("Malformed version: %s", v)
+        }
+        segmentsStr := strings.Split(matches[1], ".")
+        segments := make([]int64, len(segmentsStr))
+        si := 0
+        for i, str := range segmentsStr {
+                val, err := strconv.ParseInt(str, 10, 64)
+                if err != nil {
+                        return nil, fmt.Errorf(
+                                "Error parsing version: %s", err)
+                }
+
+                segments[i] = int64(val)
+                si++
+        }
+
+        // Even though we could support more than three segments, if we
+        // got less than three, pad it with 0s. This is to cover the basic
+        // default usecase of semver, which is MAJOR.MINOR.PATCH at the minimum
+        for i := len(segments); i < 3; i++ {
+                segments = append(segments, 0)
+        }
+
+        return &Version{
+                metadata: matches[7],
+                pre:      matches[4],
+                segments: segments,
+                si:       si,
+        }, nil
+}
+
+// Must is a helper that wraps a call to a function returning (*Version, error)
+// and panics if error is non-nil.
+func Must(v *Version, err error) *Version {
+        if err != nil {
+                panic(err)
+        }
+
+        return v
+}
+
+// Compare compares this version to another version. This
+// returns -1, 0, or 1 if this version is smaller, equal,
+// or larger than the other version, respectively.
+//
+// If you want boolean results, use the LessThan, Equal,
+// or GreaterThan methods.
+func (v *Version) Compare(other *Version) int {
+        // A quick, efficient equality check
+        if v.String() == other.String() {
+                return 0
+        }
+
+        segmentsSelf := v.Segments64()
+        segmentsOther := other.Segments64()
+
+        // If the segments are the same, we must compare on prerelease info
+        if reflect.DeepEqual(segmentsSelf, segmentsOther) {
+                preSelf := v.Prerelease()
+                preOther := other.Prerelease()
+                if preSelf == "" && preOther == "" {
+                        return 0
+                }
+                if preSelf == "" {
+                        return 1
+                }
+                if preOther == "" {
+                        return -1
+                }
+
+                return comparePrereleases(preSelf, preOther)
+        }
+
+        // Get the highest specificity (hS), or if they're equal, just use segmentSelf length
+        lenSelf := len(segmentsSelf)
+        lenOther := len(segmentsOther)
+        hS := lenSelf
+        if lenSelf < lenOther {
+                hS = lenOther
+        }
+        // Compare the segments
+        // Because a constraint could have more/less specificity than the version it's
+        // checking, we need to account for a lopsided or jagged comparison
+        for i := 0; i < hS; i++ {
+                if i > lenSelf-1 {
+                        // This means Self had the lower specificity
+                        // Check to see if the remaining segments in Other are all zeros
+                        if !allZero(segmentsOther[i:]) {
+                                // if not, it means that Other has to be greater than Self
+                                return -1
+                        }
+                        break
+                } else if i > lenOther-1 {
+                        // this means Other had the lower specificity
+                        // Check to see if the remaining segments in Self are all zeros -
+                        if !allZero(segmentsSelf[i:]) {
+                                //if not, it means that Self has to be greater than Other
+                                return 1
+                        }
+                        break
+                }
+                lhs := segmentsSelf[i]
+                rhs := segmentsOther[i]
+                if lhs == rhs {
+                        continue
+                } else if lhs < rhs {
+                        return -1
+                }
+                // Otherwis, rhs was > lhs, they're not equal
+                return 1
+        }
+
+        // if we got this far, they're equal
+        return 0
+}
+
+func allZero(segs []int64) bool {
+        for _, s := range segs {
+                if s != 0 {
+                        return false
+                }
+        }
+        return true
+}
+
+func comparePart(preSelf string, preOther string) int {
+        if preSelf == preOther {
+                return 0
+        }
+
+        // if a part is empty, we use the other to decide
+        if preSelf == "" {
+                _, notIsNumeric := strconv.ParseInt(preOther, 10, 64)
+                if notIsNumeric == nil {
+                        return -1
+                }
+                return 1
+        }
+
+        if preOther == "" {
+                _, notIsNumeric := strconv.ParseInt(preSelf, 10, 64)
+                if notIsNumeric == nil {
+                        return 1
+                }
+                return -1
+        }
+
+        if preSelf > preOther {
+                return 1
+        }
+
+        return -1
+}
+
+func comparePrereleases(v string, other string) int {
+        // the same pre release!
+        if v == other {
+                return 0
+        }
+
+        // split both pre releases for analyse their parts
+        selfPreReleaseMeta := strings.Split(v, ".")
+        otherPreReleaseMeta := strings.Split(other, ".")
+
+        selfPreReleaseLen := len(selfPreReleaseMeta)
+        otherPreReleaseLen := len(otherPreReleaseMeta)
+
+        biggestLen := otherPreReleaseLen
+        if selfPreReleaseLen > otherPreReleaseLen {
+                biggestLen = selfPreReleaseLen
+        }
+
+        // loop for parts to find the first difference
+        for i := 0; i < biggestLen; i = i + 1 {
+                partSelfPre := ""
+                if i < selfPreReleaseLen {
+                        partSelfPre = selfPreReleaseMeta[i]
+                }
+
+                partOtherPre := ""
+                if i < otherPreReleaseLen {
+                        partOtherPre = otherPreReleaseMeta[i]
+                }
+
+                compare := comparePart(partSelfPre, partOtherPre)
+                // if parts are equals, continue the loop
+                if compare != 0 {
+                        return compare
+                }
+        }
+
+        return 0
+}
+
+// Equal tests if two versions are equal.
+func (v *Version) Equal(o *Version) bool {
+        return v.Compare(o) == 0
+}
+
+// GreaterThan tests if this version is greater than another version.
+func (v *Version) GreaterThan(o *Version) bool {
+        return v.Compare(o) > 0
+}
+
+// LessThan tests if this version is less than another version.
+func (v *Version) LessThan(o *Version) bool {
+        return v.Compare(o) < 0
+}
+
+// Metadata returns any metadata that was part of the version
+// string.
+//
+// Metadata is anything that comes after the "+" in the version.
+// For example, with "1.2.3+beta", the metadata is "beta".
+func (v *Version) Metadata() string {
+        return v.metadata
+}
+
+// Prerelease returns any prerelease data that is part of the version,
+// or blank if there is no prerelease data.
+//
+// Prerelease information is anything that comes after the "-" in the
+// version (but before any metadata). For example, with "1.2.3-beta",
+// the prerelease information is "beta".
+func (v *Version) Prerelease() string {
+        return v.pre
+}
+
+// Segments returns the numeric segments of the version as a slice of ints.
+//
+// This excludes any metadata or pre-release information. For example,
+// for a version "1.2.3-beta", segments will return a slice of
+// 1, 2, 3.
+func (v *Version) Segments() []int {
+        segmentSlice := make([]int, len(v.segments))
+        for i, v := range v.segments {
+                segmentSlice[i] = int(v)
+        }
+        return segmentSlice
+}
+
+// Segments64 returns the numeric segments of the version as a slice of int64s.
+//
+// This excludes any metadata or pre-release information. For example,
+// for a version "1.2.3-beta", segments will return a slice of
+// 1, 2, 3.
+func (v *Version) Segments64() []int64 {
+        return v.segments
+}
+
+// String returns the full version string included pre-release
+// and metadata information.
+func (v *Version) String() string {
+        var buf bytes.Buffer
+        fmtParts := make([]string, len(v.segments))
+        for i, s := range v.segments {
+                // We can ignore err here since we've pre-parsed the values in segments
+                str := strconv.FormatInt(s, 10)
+                fmtParts[i] = str
+        }
+        fmt.Fprintf(&buf, strings.Join(fmtParts, "."))
+        if v.pre != "" {
+                fmt.Fprintf(&buf, "-%s", v.pre)
+        }
+        if v.metadata != "" {
+                fmt.Fprintf(&buf, "+%s", v.metadata)
+        }
+
+        return buf.String()
+}
diff --git a/vendor/github.com/hashicorp/go-version/version_collection.go b/vendor/github.com/hashicorp/go-version/version_collection.go
new file mode 100644
index 0000000..cc888d4
--- /dev/null
+++ b/vendor/github.com/hashicorp/go-version/version_collection.go
@@ -0,0 +1,17 @@
+package version
+
+// Collection is a type that implements the sort.Interface interface
+// so that versions can be sorted.
+type Collection []*Version
+
+func (v Collection) Len() int {
+        return len(v)
+}
+
+func (v Collection) Less(i, j int) bool {
+        return v[i].LessThan(v[j])
+}
+
+func (v Collection) Swap(i, j int) {
+        v[i], v[j] = v[j], v[i]
+}