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/*
* Copyright 2015 Google Inc.
*
* 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; version 2 of the License.
*
* 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.
*/
package main
import (
"bufio"
"fmt"
"log"
"os"
"os/exec"
"path/filepath"
)
type subsystem struct {
name string
maintainer []string
file []string
}
var subsystems []subsystem
func get_git_files() ([]string, error) {
var files []string
/* Read in list of all files in the git repository */
cmd := exec.Command("git", "ls-files")
out, err := cmd.StdoutPipe()
if err != nil {
log.Fatalf("git ls-files failed: %v", err)
return files, err
}
if err := cmd.Start(); err != nil {
log.Fatalf("Could not start %v: %v", cmd, err)
return files, err
}
r := bufio.NewScanner(out)
for r.Scan() {
/* Cut out leading tab */
files = append(files, r.Text())
}
cmd.Wait()
return files, nil
}
func get_maintainers() ([]string, error) {
var maintainers []string
/* Read in all maintainers */
file, err := os.Open("MAINTAINERS")
if err != nil {
log.Fatalf("Can't open MAINTAINERS file: %v", err)
log.Fatalf("Are you running from the top-level directory?")
return maintainers, err
}
defer file.Close()
keep := false
s := bufio.NewScanner(file)
for s.Scan() {
/* Are we in the "data" section and have a non-empty line? */
if keep && s.Text() != "" {
maintainers = append(maintainers, s.Text())
}
/* Skip everything before the delimiter */
if s.Text() == "\t\t-----------------------------------" {
keep = true
}
}
return maintainers, nil
}
func build_maintainers(maintainers []string) {
var current *subsystem
for _, line := range maintainers {
if line[1] != ':' {
/* Create new subsystem entry */
var tmp subsystem
subsystems = append(subsystems, tmp)
current = &subsystems[len(subsystems)-1]
current.name = line
} else {
switch line[0] {
case 'R', 'M':
/* Add subsystem maintainer */
current.maintainer = append(current.maintainer, line[3:len(line)])
case 'F':
// add files
current.file = append(current.file, line[3:len(line)])
case 'L', 'S', 'T', 'W': // ignore
default:
fmt.Println("No such specifier: ", line)
}
}
}
}
func print_maintainers() {
for _, subsystem := range subsystems {
fmt.Println(subsystem.name)
fmt.Println(" ", subsystem.maintainer)
fmt.Println(" ", subsystem.file)
}
}
func match_file(fname string, files []string) (bool, error) {
var matched bool
var err error
for _, file := range files {
/* Direct match */
matched, err = filepath.Match(file, fname)
if err != nil {
return false, err
}
if matched {
return true, nil
}
/* There are three cases that match_file can handle:
*
* dirname/filename
* dirname/*
* dirname/
*
* The first case is an exact match, the second case is a
* direct match of everything in that directory, and the third
* is a direct match of everything in that directory and its
* subdirectories.
*
* The first two cases are handled above, the code below is
* only for that latter case, so if file doesn't end in /,
* skip to the next file.
*/
if file[len(file)-1] != '/' {
continue
}
/* Remove / because we add it again below */
file = file[:len(file)-1]
/* Maximum tree depth, as calculated by
* $(( `git ls-files | tr -d "[a-z][A-Z][0-9]\-\_\." | \
* sort -u | tail -1 | wc -c` - 1 ))
* 11
*/
max_depth := 11
for i := 0; i < max_depth; i++ {
/* Subdirectory match */
file += "/*"
if matched, err = filepath.Match(file, fname); err != nil {
return false, err
}
if matched {
return true, nil
}
}
}
return false, nil
}
func find_maintainer(fname string) {
for _, subsystem := range subsystems {
matched, err := match_file(fname, subsystem.file)
if err != nil {
log.Fatalf("match_file failed: %v", err)
return
}
if matched && subsystem.name != "THE REST" {
fmt.Println(fname, "is in subsystem",
subsystem.name)
fmt.Println("Maintainers: ", subsystem.maintainer)
return
}
}
fmt.Println(fname, "has no subsystem defined in MAINTAINERS")
}
func find_unmaintained(fname string) {
for _, subsystem := range subsystems {
matched, err := match_file(fname, subsystem.file)
if err != nil {
log.Fatalf("match_file failed: %v", err)
return
}
if matched && subsystem.name != "THE REST" {
fmt.Println(fname, "is in subsystem",
subsystem.name)
return
}
}
fmt.Println(fname, "has no subsystem defined in MAINTAINERS")
}
func main() {
var files []string
var maint bool
var debug bool
var err error
args := os.Args[1:]
if len(args) == 0 {
/* get the filenames */
files, err = get_git_files()
if err != nil {
log.Fatalf("Oops.")
return
}
maint = false
} else {
files = args
maint = true
}
maintainers, err := get_maintainers()
if err != nil {
log.Fatalf("Oops.")
return
}
/* build subsystem database */
build_maintainers(maintainers)
if debug {
print_maintainers()
}
if maint {
/* Find maintainers for each file */
for _, file := range files {
find_maintainer(file)
}
} else {
for _, file := range files {
find_unmaintained(file)
}
}
}
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