contrib: remove "persistent-https" remote helper

The "persistent-https" remote helper supposedly speeds up SSL operations
by running a daemon that keeps a connection open to a remote server. It
is effectively unmaintained nowadays: the last time it received an
update was in accb613afd2 (contrib/persistent-https: use Git version for
build label, 2016-07-20) and its parent commits to make it compile with
Go 1.7+.

This Go toolchain is somewhat dated by now though and unsupported. The
oldest still-supported toolchain is Go 1.23, which was released in
August 2024. It is not possible to compile the remote helper with that
Go version anymore:

    $ go version
    go version go1.23.8 linux/amd64
    $ make
    case $(go version) in \
    "go version go"1.[0-5].*) EQ=" " ;; *) EQ="=" ;; esac && \
    go build -o git-remote-persistent-https \
            -ldflags "-X main._BUILD_EMBED_LABEL${EQ}GIT_VERSION=2.49.0.943.g965a70ebf62"
    go: cannot find main module, but found .git/config in /home/pks/Development/git
            to create a module there, run:
            cd ../.. && go mod init
    make: *** [Makefile:31: git-remote-persistent-https] Error 1

The problem is that modern Go toolchains require a "go.mod" file, but we
don't have any such files. This requirement exists since quite a while
already, so it's clear that nobody has tried to use this remote helper
anytime recent.

Remove the remote helper.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 0 insertions, 97 deletions

diff --git a/contrib/persistent-https/socket.go b/contrib/persistent-https/socket.go
deleted file mode 100644
index 193b911dd1..0000000000
--- a/contrib/persistent-https/socket.go
+++ /dev/null
@@ -1,97 +0,0 @@
-// Copyright 2012 Google Inc. All Rights Reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package main
-
-import (
-	"fmt"
-	"log"
-	"net"
-	"os"
-	"path/filepath"
-	"syscall"
-)
-
-// A Socket is a wrapper around a Unix socket that verifies directory
-// permissions.
-type Socket struct {
-	Dir string
-}
-
-func defaultDir() string {
-	sockPath := ".git-credential-cache"
-	if home := os.Getenv("HOME"); home != "" {
-		return filepath.Join(home, sockPath)
-	}
-	log.Printf("socket: cannot find HOME path. using relative directory %q for socket", sockPath)
-	return sockPath
-}
-
-// DefaultSocket is a Socket in the $HOME/.git-credential-cache directory.
-var DefaultSocket = Socket{Dir: defaultDir()}
-
-// Listen announces the local network address of the unix socket. The
-// permissions on the socket directory are verified before attempting
-// the actual listen.
-func (s Socket) Listen() (net.Listener, error) {
-	network, addr := "unix", s.Path()
-	if err := s.mkdir(); err != nil {
-		return nil, &net.OpError{Op: "listen", Net: network, Addr: &net.UnixAddr{Name: addr, Net: network}, Err: err}
-	}
-	return net.Listen(network, addr)
-}
-
-// Dial connects to the unix socket. The permissions on the socket directory
-// are verified before attempting the actual dial.
-func (s Socket) Dial() (net.Conn, error) {
-	network, addr := "unix", s.Path()
-	if err := s.checkPermissions(); err != nil {
-		return nil, &net.OpError{Op: "dial", Net: network, Addr: &net.UnixAddr{Name: addr, Net: network}, Err: err}
-	}
-	return net.Dial(network, addr)
-}
-
-// Path returns the fully specified file name of the unix socket.
-func (s Socket) Path() string {
-	return filepath.Join(s.Dir, "persistent-https-proxy-socket")
-}
-
-func (s Socket) mkdir() error {
-	if err := s.checkPermissions(); err == nil {
-		return nil
-	} else if !os.IsNotExist(err) {
-		return err
-	}
-	if err := os.MkdirAll(s.Dir, 0700); err != nil {
-		return err
-	}
-	return s.checkPermissions()
-}
-
-func (s Socket) checkPermissions() error {
-	fi, err := os.Stat(s.Dir)
-	if err != nil {
-		return err
-	}
-	if !fi.IsDir() {
-		return fmt.Errorf("socket: got file, want directory for %q", s.Dir)
-	}
-	if fi.Mode().Perm() != 0700 {
-		return fmt.Errorf("socket: got perm %o, want 700 for %q", fi.Mode().Perm(), s.Dir)
-	}
-	if st := fi.Sys().(*syscall.Stat_t); int(st.Uid) != os.Getuid() {
-		return fmt.Errorf("socket: got uid %d, want %d for %q", st.Uid, os.Getuid(), s.Dir)
-	}
-	return nil
-}