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/*******************************************************************************
*
* Copyright 2017 Stefan Majewsky <majewsky@gmx.net>
*
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later
* version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*
*******************************************************************************/
package main
import (
"errors"
"fmt"
"io/ioutil"
"os"
"path/filepath"
yaml "gopkg.in/yaml.v2"
)
//Repo describes the entry for a repository in the index file.
type Repo struct {
//Remotes maps remote names (as noted in the .git/config of the repo) to
//remote URLs (as they appear in the .git/config of the repo, i.e. possibly
//abbreviated).
Remotes map[string]string `yaml:"remotes"`
//CheckoutPath shall be relative to the Index.RootPath.
CheckoutPath string `yaml:"path"`
}
//Index represents the contents of the index file.
type Index struct {
RootPath string `yaml:"root"`
Repos []Repo `yaml:"repos"`
}
func indexPath() string {
homeDir := os.Getenv("HOME")
if homeDir == "" {
FatalIfError(errors.New("$HOME is not set"))
}
return filepath.Join(homeDir, ".rtree/index.yaml")
}
//ReadIndex reads the index file.
func ReadIndex() *Index {
//read contents of index file
path := indexPath()
buf, err := ioutil.ReadFile(path)
if err != nil {
if os.IsNotExist(err) {
//initialize empty index
rootPath := os.Getenv("GOPATH")
if rootPath == "" {
FatalIfError(fmt.Errorf("cannot initialize %s ($GOPATH not set)", path))
}
return &Index{RootPath: rootPath}
}
FatalIfError(err)
}
//deserialize YAML
var index Index
FatalIfError(yaml.Unmarshal(buf, &index))
//validate YAML
valid := true
if index.RootPath == "" {
ShowError(errors.New("missing \"root\""))
valid = false
}
for idx, repo := range index.Repos {
if repo.CheckoutPath == "" {
ShowError(fmt.Errorf("missing \"repos[%d].path\"", idx))
valid = false
}
if len(repo.Remotes) == 0 {
ShowError(fmt.Errorf("missing \"repos[%d].remotes\"", idx))
valid = false
}
for remoteName, remoteURL := range repo.Remotes {
switch {
case remoteName == "":
ShowError(fmt.Errorf("empty remote name found in \"repos[%d]\"", idx))
valid = false
case remoteURL == "":
ShowError(fmt.Errorf("missing remote URL for remote \"%s\" in \"repos[%d]\"", idx, remoteName))
valid = false
}
}
}
if !valid {
FatalIfError(errors.New("index file is corrupted; see errors above"))
}
return &index
}
//Write writes the index file to disk.
func (i *Index) Write() {
buf, err := yaml.Marshal(i)
FatalIfError(err)
path := indexPath()
FatalIfError(os.MkdirAll(filepath.Dir(path), 0755))
FatalIfError(ioutil.WriteFile(path, buf, 0644))
}
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