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git.go
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git.go
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/*
Copyright 2020 The Knative Authors
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package git
import (
"fmt"
"strings"
"github.com/blang/semver/v4"
"github.com/go-git/go-git/v5"
"github.com/go-git/go-git/v5/config"
"github.com/go-git/go-git/v5/storage/memory"
)
// Repo is a simplified git remote, containing only the list of tags, default
// branch and branches.
type Repo struct {
Ref string
DefaultBranch string
Tags []string
Branches []string
}
// GetRepo will fetch a git repo and process it into a Repo object.
func GetRepo(ref, url string) (*Repo, error) {
repo := new(Repo)
repo.Ref = ref
rem := git.NewRemote(memory.NewStorage(), &config.RemoteConfig{
Name: "origin",
URLs: []string{url},
})
refs, err := rem.List(&git.ListOptions{})
if err != nil {
return nil, err
}
for _, ref := range refs {
if ref.Name().IsTag() {
repo.Tags = append(repo.Tags, ref.Name().Short())
} else if ref.Name().IsBranch() {
repo.Branches = append(repo.Branches, ref.Name().Short())
} else if ref.Name() == "HEAD" { // Default branch.
repo.DefaultBranch = ref.Target().Short()
}
}
return repo, nil
}
type RefType int
const (
// BranchRef - branch
BranchRef RefType = iota
// DefaultBranchRef - default branch
DefaultBranchRef
// ReleaseBranchRef - release branch
ReleaseBranchRef
// ReleaseRef - tagged release
ReleaseRef
// NoRef - ref not found
NoRef
// UndefinedRef is not defined
UndefinedRef
)
var refTypeString = []string{"Branch", "Default Branch", "Release Branch", "Release", "No Ref"}
// String returns the string of RefType in human readable form.
func (rt RefType) String() string {
if rt >= DefaultBranchRef && rt <= NoRef {
return refTypeString[rt]
}
return ""
}
// BestRefFor Returns module@ref, isRelease based on the provided ruleset for
// a this release.
func (r *Repo) BestRefFor(release, moduleRelease semver.Version, ruleset RulesetType) (string, RefType) {
switch ruleset {
case AnyRule, ReleaseOrReleaseBranchRule, ReleaseRule:
var largest *semver.Version
// Look for a release.
for _, t := range r.Tags {
if sv, ok := normalizeTagVersion(t); ok {
v, _ := semver.Make(sv)
// Go does not understand how to fetch semver tags with pre or build tags, skip those.
if v.Pre != nil || v.Build != nil {
continue
}
if v.Major == moduleRelease.Major && v.Minor == moduleRelease.Minor {
if largest == nil || largest.LT(v) {
largest = &v
}
}
}
}
if largest != nil {
return fmt.Sprintf("%s@%s", r.Ref, ReleaseVersion(*largest)), ReleaseRef
}
}
switch ruleset {
case AnyRule, ReleaseOrReleaseBranchRule, ReleaseBranchRule:
var largest *semver.Version
// Look for a release branch.
for _, b := range r.Branches {
if bv, ok := normalizeBranchVersion(b); ok {
v, _ := semver.Make(bv)
if v.Major == release.Major && v.Minor == release.Minor {
if largest == nil || largest.LT(v) {
largest = &v
}
}
}
}
if largest != nil {
return fmt.Sprintf("%s@%s", r.Ref, ReleaseBranchVersion(*largest)), ReleaseBranchRef
}
}
switch ruleset {
case AnyRule:
// Look for a Return default branch.
return fmt.Sprintf("%s@%s", r.Ref, r.DefaultBranch), DefaultBranchRef
}
// No ref found with the provided rule
return r.Ref, NoRef
}
func normalizeTagVersion(v string) (string, bool) {
if strings.HasPrefix(v, "v") {
// No need to account for unicode widths.
return v[1:], true
}
return v, false
}
// ReleaseVersion returns a formatted release tag for a given version.
func ReleaseVersion(v semver.Version) string {
return fmt.Sprintf("v%d.%d.%d", v.Major, v.Minor, v.Patch)
}
func normalizeBranchVersion(v string) (string, bool) {
if strings.HasPrefix(v, "release-") {
// No need to account for unicode widths.
return v[len("release-"):] + ".0", true
}
return v, false
}
// ReleaseBranchVersion returns a formatted release branch for a given version.
func ReleaseBranchVersion(v semver.Version) string {
return fmt.Sprintf("release-%d.%d", v.Major, v.Minor)
}
// ParseRef takes a go module ref and converts it to the module name and RefType.
// ParseRef expects ref to be in the form "module@ref".
// Only release branches and
func ParseRef(ref string) (string, string, RefType) {
parts := strings.Split(ref, "@")
if len(parts) != 2 {
return ref, "", UndefinedRef
}
// Try ref as a tag.
if _, ok := normalizeTagVersion(parts[1]); ok {
return parts[0], parts[1], ReleaseRef
}
// Try ref as a release branch.
if _, ok := normalizeBranchVersion(parts[1]); ok {
return parts[0], parts[1], ReleaseBranchRef
}
// At this point we have to assume it is a branch.
return parts[0], parts[1], BranchRef
}