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manifest.go
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manifest.go
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package main
import (
"encoding/json"
"os"
"github.com/Masterminds/semver"
log "github.com/sirupsen/logrus"
)
// ManifestRepositoryInfo -
type ManifestRepositoryInfo struct {
SrcType string
SrcValue string
Values map[string]interface{}
}
// Manifest - decribes repositories and packages we want to use.
type Manifest struct {
Wants map[string]string
Repositories map[string]ManifestRepositoryInfo
Packages map[string]map[string]map[string]interface{}
OutPackages map[string]map[string]interface{}
}
// ParseManifest - parses a manifest file
func ParseManifest(filename string) Manifest {
log.WithFields(log.Fields{"From": filename}).Info("Loading manifest")
file, err := os.Open(filename)
defer file.Close()
if err != nil {
log.Panic(err)
}
var data map[string]interface{}
jsonParser := json.NewDecoder(file)
err = jsonParser.Decode(&data)
if err != nil {
log.Panic(err)
}
mWants := map[string]string{}
mRepositories := map[string]ManifestRepositoryInfo{}
if wants, ok := data["wants"]; ok {
wants := wants.(map[string]interface{})
for w, v := range wants {
mWants[w] = v.(string)
}
}
if repositories, ok := data["repositories"]; ok {
repositories := repositories.(map[string]interface{})
for reponame, repo := range repositories {
repo := repo.([]interface{})
repopath := repo[0].(map[string]interface{})
repovals := repo[1].(map[string]interface{})
var r = ManifestRepositoryInfo{
Values: repovals,
}
if _, ok := repopath["file"]; ok {
r.SrcType = "file"
r.SrcValue = repopath["file"].(string)
}
for k, v := range repovals {
r.Values[k] = v.(string)
}
mRepositories[reponame] = r
}
}
manifest := Manifest{
Wants: mWants,
Repositories: mRepositories,
Packages: map[string]map[string]map[string]interface{}{},
OutPackages: map[string]map[string]interface{}{},
}
for rn, rv := range manifest.Repositories {
log.WithFields(log.Fields{"Name": rn}).Info("Loading repository")
r := RepositoryFromInfo(rv)
for pn, pf := range r.PackageFiles {
for pv, p := range pf.Packages {
if l, ok := manifest.Packages[pn]; ok {
l[pv] = p
manifest.Packages[pn] = l
} else {
manifest.Packages[pn] = map[string]map[string]interface{}{pv: p}
}
}
}
}
for pn, pc := range manifest.Wants {
manifest.Filter(pn, pc)
}
for pn := range manifest.Wants {
manifest.Resolve(pn, []string{})
}
for pn := range manifest.Wants {
manifest.Merge(pn, []string{})
}
manifest.Dump()
return manifest
}
func strSliceHas(sl []string, s string) bool {
for _, ss := range sl {
if ss == s {
return true
}
}
return false
}
// Latest - gets latest version of a package
func (m *Manifest) Latest(pn string) *map[string]interface{} {
var v *semver.Version
var ap *map[string]interface{}
for pv, p := range m.Packages[pn] {
nv, err := semver.NewVersion(pv)
if err != nil {
log.Panic(err)
}
if v == nil || nv.GreaterThan(nv) {
v = nv
ap = &p
}
}
return ap
}
// Filter - filters packages by version
func (m *Manifest) Filter(pn string, vc string) {
c, err := semver.NewConstraint(vc)
if err != nil {
log.Panic(err)
}
del := []string{}
for pv := range m.Packages[pn] {
v, err := semver.NewVersion(pv)
if err != nil {
log.Panic(err)
}
if !c.Check(v) {
del = append(del, pv)
}
}
for _, pv := range del {
delete(m.Packages[pn], pv)
}
if len(m.Packages[pn]) == 0 {
log.WithFields(log.Fields{"Package": pn}).Panic("No versions of package left")
}
}
// Resolve - resolves packages' dependencies
func (m *Manifest) Resolve(pn string, parents []string) {
if strSliceHas(parents, pn) {
return
}
p := m.Latest(pn)
if wants, ok := (*p)["wants"]; ok {
wants := wants.(map[string]interface{})
for dn, dv := range wants {
dv := dv.(string)
m.Filter(dn, dv)
}
for dn := range wants {
m.Resolve(dn, append(parents, pn))
}
}
}
// Merge - merges package and their deps into manifest out
func (m *Manifest) Merge(pn string, parents []string) {
if strSliceHas(parents, pn) {
return
}
p := m.Latest(pn)
m.OutPackages[pn] = *p
if wants, ok := (*p)["wants"]; ok {
wants := wants.(map[string]interface{})
for dn := range wants {
m.Merge(dn, append(parents, pn))
}
}
}
// Dump - dumps the manifest to a file
func (m *Manifest) Dump() {
out := map[string]interface{}{}
wants := []string{}
for pn := range m.Wants {
wants = append(wants, pn)
}
out["wants"] = wants
packages := map[string]interface{}{}
for pn, p := range m.OutPackages {
if wants, ok := p["wants"]; ok {
wants := wants.(map[string]interface{})
nw := []string{}
for dn := range wants {
nw = append(nw, dn)
}
p["wants"] = nw
}
packages[pn] = p
}
out["packages"] = packages
file, err := os.Create("./airbuild.json")
defer file.Close()
if err != nil {
log.Panic(err)
}
e := json.NewEncoder(file)
e.SetIndent("", " ")
err = e.Encode(out)
if err != nil {
log.Panic(err)
}
log.Info("Generated airbuild.json")
}