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package main
import (
"bytes"
"encoding/json"
"filelock"
"fmt"
"io"
"io/ioutil"
"os"
"path"
"sort"
"strconv"
"syscall"
"time"
)
type RepoLock struct{ *os.File }
func GetRepoLock(arch string) (*RepoLock, error) {
lpath := path.Join(arch, "memex/lock")
f, err := os.OpenFile(lpath, os.O_RDWR|os.O_CREATE, 0644)
if err != nil {
return nil, err
}
err = filelock.Lock(f)
if err != nil {
defer f.Close()
if err.(*os.PathError).Err == syscall.EWOULDBLOCK {
var buf bytes.Buffer
io.Copy(&buf, f)
pid, _ := strconv.Atoi(buf.String())
err = fmt.Errorf("%s: held by process %d", lpath, pid)
return nil, err
}
return nil, err
}
f.Truncate(0)
f.WriteString(strconv.Itoa(os.Getpid()))
f.Sync()
return &RepoLock{f}, nil
}
func (l *RepoLock) Unlock() {
l.Close()
}
func AllRefs(arch string) []string {
fs, err := ioutil.ReadDir(path.Join(arch, "memex/refs"))
if err != nil {
panic(err)
}
refs := make([]string, 0, len(fs))
for _, f := range fs {
if !f.IsDir() {
refs = append(refs, f.Name())
}
}
return refs
}
func ReadRef(arch, ref string) (Addr, error) {
rpath := path.Join(arch, "memex/refs", ref)
b, err := ioutil.ReadFile(rpath)
if err != nil {
return nil, err
}
if len(b) > 0 {
b = b[:len(b)-1]
}
if a := DecodeAddr(b); a != nil {
return a, nil
}
return nil, fmt.Errorf("invalid address '%s' in ref/%s", b, ref)
}
func Reflog(arch, ref string, addr Addr) {
lpath := path.Join(arch, "memex/reflog")
flags := os.O_WRONLY | os.O_APPEND | os.O_CREATE
f, err := os.OpenFile(lpath, flags, 0666)
if err != nil {
return
}
enc := json.NewEncoder(f)
enc.SetIndent("", "")
enc.SetEscapeHTML(false)
enc.Encode(map[string]string{
"ref": ref,
"addr": addr.String(),
"date": time.Now().Truncate(time.Second).String(),
"cmd": CmdLine(),
})
f.Close()
}
func NewRef(arch, ref string) error {
rpath := path.Join(arch, "memex/refs", ref)
f, err := os.OpenFile(rpath, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0666)
if err != nil {
return err
}
f.Close()
return nil
}
func WriteRef(arch, ref string, addr Addr) error {
Reflog(arch, ref, addr)
rpath := path.Join(arch, "memex/refs", ref)
return WriteFile(rpath, addr.String()+"\n")
}
func ReadCommitCache(arch string) []string {
cpath := path.Join(arch, "memex/commits")
b, err := ioutil.ReadFile(cpath)
if err != nil {
return nil
}
var s []string
for len(b) >= AddrDisplayLen+1 {
s = append(s, string(b[0:AddrDisplayLen]))
b = b[AddrDisplayLen+1:]
}
sort.Strings(s)
return s
}
func WriteCommitCache(arch string, cache []string) {
cpath := path.Join(arch, "memex/commits")
f, err := os.OpenFile(cpath, os.O_CREATE|os.O_WRONLY, 0600)
if err != nil {
return
}
f.Truncate(0)
for _, line := range cache {
f.WriteString(line + "\n")
}
f.Close()
}
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