func (c *HelpToolCommand) Run(ctx *cmd.Context) error {
var hookctx dummyHookContext
if c.tool == "" {
// Ripped from SuperCommand. We could Run() a SuperCommand
// with "help commands", but then the implicit "help" command
// shows up.
names := jujuc.CommandNames()
cmds := make([]cmd.Command, 0, len(names))
longest := 0
for _, name := range names {
if c, err := jujuc.NewCommand(hookctx, name); err == nil {
if len(name) > longest {
longest = len(name)
}
cmds = append(cmds, c)
}
}
for _, c := range cmds {
info := c.Info()
fmt.Fprintf(ctx.Stdout, "%-*s %s\n", longest, info.Name, info.Purpose)
}
} else {
c, err := jujuc.NewCommand(hookctx, c.tool)
if err != nil {
return err
}
info := c.Info()
f := gnuflag.NewFlagSet(info.Name, gnuflag.ContinueOnError)
c.SetFlags(f)
ctx.Stdout.Write(info.Help(f))
}
return nil
}
func (s *ToolsSuite) TestEnsureJujucSymlinks(c *C) {
jujudPath := filepath.Join(s.toolsDir, "jujud")
err := ioutil.WriteFile(jujudPath, []byte("assume sane"), 0755)
c.Assert(err, IsNil)
assertLink := func(path string) time.Time {
target, err := os.Readlink(path)
c.Assert(err, IsNil)
c.Assert(target, Equals, "./jujud")
fi, err := os.Lstat(path)
c.Assert(err, IsNil)
return fi.ModTime()
}
// Check that EnsureJujucSymlinks writes appropriate symlinks.
err = uniter.EnsureJujucSymlinks(s.toolsDir)
c.Assert(err, IsNil)
mtimes := map[string]time.Time{}
for _, name := range jujuc.CommandNames() {
tool := filepath.Join(s.toolsDir, name)
mtimes[tool] = assertLink(tool)
}
// Check that EnsureJujucSymlinks doesn't overwrite things that don't need to be.
err = uniter.EnsureJujucSymlinks(s.toolsDir)
c.Assert(err, IsNil)
for tool, mtime := range mtimes {
c.Assert(assertLink(tool), Equals, mtime)
}
}
// EnsureJujucSymlinks creates a symbolic link to jujuc within dir for each
// hook command. If the commands already exist, this operation does nothing.
func EnsureJujucSymlinks(dir string) (err error) {
for _, name := range jujuc.CommandNames() {
// The link operation fails when the target already exists,
// so this is a no-op when the command names already
// exist.
err := os.Symlink("./jujuc", filepath.Join(dir, name))
if err == nil {
continue
}
// TODO(rog) drop LinkError check when fix is released (see http://codereview.appspot.com/6442080/)
if e, ok := err.(*os.LinkError); !ok || !os.IsExist(e.Err) {
return fmt.Errorf("cannot initialize hook commands in %q: %v", dir, err)
}
}
return nil
}