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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 (
"bytes"
"errors"
"fmt"
"os"
"os/exec"
"path/filepath"
"regexp"
"strings"
)
//RootPath is the directory below which all repositories are located. Its value
//is $GOPATH/src to match the repository layout created by `go get`.
var RootPath string
func init() {
gopath := os.Getenv("GOPATH")
if gopath == "" {
FatalIfError(errors.New("$GOPATH is not set (rtree needs the GOPATH variable to know where to look for and place repos)"))
}
RootPath = filepath.Join(gopath, "src")
}
//Repo describes the entry for a repository in the index file.
type Repo struct {
//CheckoutPath shall be relative to the RootPath.
CheckoutPath string `yaml:"path"`
//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 []Remote `yaml:"remotes"`
}
//Remote describes a remote that is configured in a Repo.
type Remote struct {
Name string `yaml:"name"`
URL string `yaml:"url"`
}
//AbsolutePath returns the absolute CheckoutPath of this repo.
func (r Repo) AbsolutePath() string {
return filepath.Join(RootPath, r.CheckoutPath)
}
//NewRepoFromAbsolutePath initializes a Repo instance by scanning the existing
//checkout at the given path.
func NewRepoFromAbsolutePath(path string) (repo Repo, err error) {
repo.CheckoutPath, err = filepath.Rel(RootPath, path)
if err != nil {
return
}
//list remotes
cmd := exec.Command("git", "-C", path, "config", "-l")
var buf bytes.Buffer
cmd.Stdout = &buf
cmd.Stderr = os.Stderr
err = cmd.Run()
if err != nil {
return repo, fmt.Errorf("exec `git config -l` in %s: %s", path, err.Error())
}
for _, line := range strings.Split(string(buf.Bytes()), "\n") {
match := remoteConfigRx.FindStringSubmatch(line)
if match == nil {
continue
}
repo.Remotes = append(repo.Remotes, Remote{
Name: match[1],
URL: match[2],
})
}
return
}
var remoteConfigRx = regexp.MustCompile(`remote\.([^=]+)\.url=(.+)`)
//ForeachPhysicalRepo walks over the repository tree, executing the action
//function once for every repo encountered (but *not* for repos contained
//within other repos, e.g. submodules).
func ForeachPhysicalRepo(action func(repo Repo) error) error {
return filepath.Walk(RootPath, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
//look for repos, i.e. directories containing a .git directory
if !info.IsDir() {
return nil
}
_, err = os.Stat(filepath.Join(path, ".git"))
if err != nil {
return nil
}
//appears to be a repo
repo, err := NewRepoFromAbsolutePath(path)
if err == nil {
err = action(repo)
}
if err != nil {
return err
}
//do not traverse further down into submodules etc.
return filepath.SkipDir
})
}
//Checkout creates the repo in the given path with the given remotes. The
//working copy will only be initialized if there is an "origin" remote.
func (r Repo) Checkout() error {
//check if we have an "origin" remote to clone from
var originURL string
for _, remote := range r.Remotes {
if remote.Name == "origin" {
originURL = remote.URL
break
}
}
if originURL == "" {
cmd := exec.Command("git", "init", r.AbsolutePath())
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
err := cmd.Run()
if err != nil {
return err
}
fmt.Fprintln(os.Stderr, "warning: will not checkout anything since there is no remote named \"origin\"")
} else {
cmd := exec.Command("git", "clone", originURL, r.AbsolutePath())
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
err := cmd.Run()
if err != nil {
return err
}
}
remotesAdded := false
for _, remote := range r.Remotes {
if remote.Name != "origin" {
cmd := exec.Command("git", "-C", r.AbsolutePath(), "remote", "add", remote.Name, remote.URL)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
err := cmd.Run()
if err != nil {
return err
}
remotesAdded = true
}
}
if remotesAdded {
cmd := exec.Command("git", "-C", r.AbsolutePath(), "remote", "update")
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
return cmd.Run()
}
return nil
}
//InteractiveExec implements the meat of the `rtree exec` command. It returns
//true iff the command exited successfully.
func (r Repo) InteractiveExec(command string, args ...string) (ok bool) {
fmt.Fprintf(os.Stdout, "\x1B[1;36m>> \x1B[0;36m%s\x1B[0m\n", r.AbsolutePath())
cmd := exec.Command(command, args...)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
cmd.Dir = r.AbsolutePath()
err := cmd.Run()
if err != nil {
fmt.Fprintf(os.Stderr, "\x1B[1;31m!! \x1B[0;31m%s\x1B[0m\n", err.Error())
return false
}
return true
}
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