Mac m1电脑brew装不上的问题。

主要问题是
1：brew command not found
2：fatal: unable to access ‘https://github.com/Homebrew/brew/‘: Failed to connect to githu
根据网上提示，使用命令：
/usr/bin/ruby -e "$(curl -fsSLhttps://raw.githubusercontent.com/Homebrew/install/master/install)"
各种操作还是不行。

问题导致原因：
1，因为访问不了“外网”，（按照网上说的修改hosts文件试了没用）。
2，因为m1芯片的电脑这个homebrew目录和其他Mac电脑不同
参考文章

解决办法（亲试有效）
步骤1：拷贝brew_install.sh脚本文件到本地。
步骤2：通过命令 /bin/bash brew_install 执行脚本。
步骤3：通过命令 export PATH=$PATH:/opt/homebrew/bin 配置环境变量。

步骤1：

下面的brew_install.sh 文件已按照文章说明配置好了，直接拷贝并保存本地待运行即可。

#!/bin/bash
set -u

abort() {
  printf "%s\n" "$@"
  exit 1
}

if [ -z "${BASH_VERSION:-}" ]; then
  abort "Bash is required to interpret this script."
fi

# Check if script is run non-interactively (e.g. CI)
# If it is run non-interactively we should not prompt for passwords.
if [[ ! -t 0 || -n "${CI-}" ]]; then
  NONINTERACTIVE=1
fi

# First check OS.
OS="$(uname)"
if [[ "$OS" == "Linux" ]]; then
  HOMEBREW_ON_LINUX=1
elif [[ "$OS" != "Darwin" ]]; then
  abort "Homebrew is only supported on macOS and Linux."
fi

# Required installation paths. To install elsewhere (which is unsupported)
# you can untar https://github.com/Homebrew/brew/tarball/master
# anywhere you like.
if [[ -z "${HOMEBREW_ON_LINUX-}" ]]; then
  UNAME_MACHINE="$(/usr/bin/uname -m)"

  if [[ "$UNAME_MACHINE" == "arm64" ]]; then
    # On ARM macOS, this script installs to /opt/homebrew only
    HOMEBREW_PREFIX="/opt/homebrew"
    HOMEBREW_REPOSITORY="${HOMEBREW_PREFIX}"
  else
    # On Intel macOS, this script installs to /usr/local only
    HOMEBREW_PREFIX="/usr/local"
    HOMEBREW_REPOSITORY="${HOMEBREW_PREFIX}/Homebrew"
  fi
  HOMEBREW_CACHE="${HOME}/Library/Caches/Homebrew"
  HOMEBREW_CORE_DEFAULT_GIT_REMOTE="https://mirrors.ustc.edu.cn/homebrew-core.git"

  STAT="stat -f"
  PERMISSION_FORMAT="%A"
  CHOWN="/usr/sbin/chown"
  CHGRP="/usr/bin/chgrp"
  GROUP="admin"
  TOUCH="/usr/bin/touch"
else
  UNAME_MACHINE="$(uname -m)"

  # On Linux, it installs to /home/linuxbrew/.linuxbrew if you have sudo access
  # and ~/.linuxbrew (which is unsupported) if run interactively.
  HOMEBREW_PREFIX_DEFAULT="/home/linuxbrew/.linuxbrew"
  HOMEBREW_CACHE="${HOME}/.cache/Homebrew"
  HOMEBREW_CORE_DEFAULT_GIT_REMOTE="https://mirrors.ustc.edu.cn/homebrew-core.git"

  STAT="stat --printf"
  PERMISSION_FORMAT="%a"
  CHOWN="/bin/chown"
  CHGRP="/bin/chgrp"
  GROUP="$(id -gn)"
  TOUCH="/bin/touch"
fi
HOMEBREW_BREW_DEFAULT_GIT_REMOTE="https://mirrors.ustc.edu.cn/brew.git"

# Use remote URLs of Homebrew repositories from environment if set.
HOMEBREW_BREW_GIT_REMOTE="${HOMEBREW_BREW_GIT_REMOTE:-"${HOMEBREW_BREW_DEFAULT_GIT_REMOTE}"}"
HOMEBREW_CORE_GIT_REMOTE="${HOMEBREW_CORE_GIT_REMOTE:-"${HOMEBREW_CORE_DEFAULT_GIT_REMOTE}"}"
# The URLs with and without the '.git' suffix are the same Git remote. Do not prompt.
if [[ "$HOMEBREW_BREW_GIT_REMOTE" == "${HOMEBREW_BREW_DEFAULT_GIT_REMOTE}.git" ]]; then
  HOMEBREW_BREW_GIT_REMOTE="${HOMEBREW_BREW_DEFAULT_GIT_REMOTE}"
fi
if [[ "$HOMEBREW_CORE_GIT_REMOTE" == "${HOMEBREW_CORE_DEFAULT_GIT_REMOTE}.git" ]]; then
  HOMEBREW_CORE_GIT_REMOTE="${HOMEBREW_CORE_DEFAULT_GIT_REMOTE}"
fi
export HOMEBREW_{BREW,CORE}_GIT_REMOTE

# TODO: bump version when new macOS is released or announced
MACOS_NEWEST_UNSUPPORTED="12.0"
# TODO: bump version when new macOS is released
MACOS_OLDEST_SUPPORTED="10.14"

# For Homebrew on Linux
REQUIRED_RUBY_VERSION=2.6  # https://github.com/Homebrew/brew/pull/6556
REQUIRED_GLIBC_VERSION=2.13  # https://docs.brew.sh/Homebrew-on-Linux#requirements
REQUIRED_CURL_VERSION=7.41.0 # HOMEBREW_MINIMUM_CURL_VERSION in brew.sh in Homebrew/brew
REQUIRED_GIT_VERSION=2.7.0 # HOMEBREW_MINIMUM_GIT_VERSION in brew.sh in Homebrew/brew

# no analytics during installation
export HOMEBREW_NO_ANALYTICS_THIS_RUN=1
export HOMEBREW_NO_ANALYTICS_MESSAGE_OUTPUT=1

# string formatters
if [[ -t 1 ]]; then
  tty_escape() { printf "\033[%sm" "$1"; }
else
  tty_escape() { :; }
fi
tty_mkbold() { tty_escape "1;$1"; }
tty_underline="$(tty_escape "4;39")"
tty_blue="$(tty_mkbold 34)"
tty_red="$(tty_mkbold 31)"
tty_bold="$(tty_mkbold 39)"
tty_reset="$(tty_escape 0)"

have_sudo_access() {
  local -a args
  if [[ -n "${SUDO_ASKPASS-}" ]]; then
    args=("-A")
  elif [[ -n "${NONINTERACTIVE-}" ]]; then
    args=("-n")
  fi

  if [[ -z "${HAVE_SUDO_ACCESS-}" ]]; then
    if [[ -n "${args[*]-}" ]]; then
      SUDO="/usr/bin/sudo ${args[*]}"
    else
      SUDO="/usr/bin/sudo"
    fi
    if [[ -n "${NONINTERACTIVE-}" ]]; then
      ${SUDO} -l mkdir &>/dev/null
    else
      ${SUDO} -v && ${SUDO} -l mkdir &>/dev/null
    fi
    HAVE_SUDO_ACCESS="$?"
  fi

  if [[ -z "${HOMEBREW_ON_LINUX-}" ]] && [[ "$HAVE_SUDO_ACCESS" -ne 0 ]]; then
    abort "Need sudo access on macOS (e.g. the user $USER needs to be an Administrator)!"
  fi

  return "$HAVE_SUDO_ACCESS"
}

shell_join() {
  local arg
  printf "%s" "$1"
  shift
  for arg in "$@"; do
    printf " "
    printf "%s" "${arg// /\ }"
  done
}

chomp() {
  printf "%s" "${1/"$'\n'"/}"
}

ohai() {
  printf "${tty_blue}==>${tty_bold} %s${tty_reset}\n" "$(shell_join "$@")"
}

warn() {
  printf "${tty_red}Warning${tty_reset}: %s\n" "$(chomp "$1")"
}

execute() {
  if ! "$@"; then
    abort "$(printf "Failed during: %s" "$(shell_join "$@")")"
  fi
}

execute_sudo() {
  local -a args=("$@")
  if have_sudo_access; then
    if [[ -n "${SUDO_ASKPASS-}" ]]; then
      args=("-A" "${args[@]}")
    fi
    ohai "/usr/bin/sudo" "${args[@]}"
    execute "/usr/bin/sudo" "${args[@]}"
  else
    ohai "${args[@]}"
    execute "${args[@]}"
  fi
}

getc() {
  local save_state
  save_state=$(/bin/stty -g)
  /bin/stty raw -echo
  IFS= read -r -n 1 -d '' "$@"
  /bin/stty "$save_state"
}

ring_bell() {
  # Use the shell's audible bell.
  if [[ -t 1 ]]; then
    printf "\a"
  fi
}

wait_for_user() {
  local c
  echo
  echo "Press RETURN to continue or any other key to abort"
  getc c
  # we test for \r and \n because some stuff does \r instead
  if ! [[ "$c" == $'\r' || "$c" == $'\n' ]]; then
    exit 1
  fi
}

major_minor() {
  echo "${1%%.*}.$(x="${1#*.}"; echo "${x%%.*}")"
}

version_gt() {
  [[ "${1%.*}" -gt "${2%.*}" ]] || [[ "${1%.*}" -eq "${2%.*}" && "${1#*.}" -gt "${2#*.}" ]]
}
version_ge() {
  [[ "${1%.*}" -gt "${2%.*}" ]] || [[ "${1%.*}" -eq "${2%.*}" && "${1#*.}" -ge "${2#*.}" ]]
}
version_lt() {
  [[ "${1%.*}" -lt "${2%.*}" ]] || [[ "${1%.*}" -eq "${2%.*}" && "${1#*.}" -lt "${2#*.}" ]]
}

should_install_command_line_tools() {
  if [[ -n "${HOMEBREW_ON_LINUX-}" ]]; then
    return 1
  fi

  if version_gt "$macos_version" "10.13"; then
    ! [[ -e "/Library/Developer/CommandLineTools/usr/bin/git" ]]
  else
    ! [[ -e "/Library/Developer/CommandLineTools/usr/bin/git" ]] ||
      ! [[ -e "/usr/include/iconv.h" ]]
  fi
}

get_permission() {
  $STAT "${PERMISSION_FORMAT}" "$1"
}

user_only_chmod() {
  [[ -d "$1" ]] && [[ "$(get_permission "$1")" != 75[0145] ]]
}

exists_but_not_writable() {
  [[ -e "$1" ]] && ! [[ -r "$1" && -w "$1" && -x "$1" ]]
}

get_owner() {
  $STAT "%u" "$1"
}

file_not_owned() {
  [[ "$(get_owner "$1")" != "$(id -u)" ]]
}

get_group() {
  $STAT "%g" "$1"
}

file_not_grpowned() {
  [[ " $(id -G "$USER") " != *" $(get_group "$1") "* ]]
}

# Please sync with 'test_ruby()' in 'Library/Homebrew/utils/ruby.sh' from Homebrew/brew repository.
test_ruby() {
  if [[ ! -x $1 ]]
  then
    return 1
  fi

  "$1" --enable-frozen-string-literal --disable=gems,did_you_mean,rubyopt -rrubygems -e \
    "abort if Gem::Version.new(RUBY_VERSION.to_s.dup).to_s.split('.').first(2) != \
              Gem::Version.new('$REQUIRED_RUBY_VERSION').to_s.split('.').first(2)" 2>/dev/null
}

test_curl() {
  if [[ ! -x $1 ]]; then
    return 1
  fi

  local curl_version_output curl_name_and_version
  curl_version_output=$("$1" --version 2>/dev/null)
  curl_name_and_version="${curl_version_output%% (*}"
  version_ge "$(major_minor "${curl_name_and_version##* }")" "$(major_minor "$REQUIRED_CURL_VERSION")"
}

test_git() {
  if [[ ! -x $1 ]]; then
    return 1
  fi

  local git_version_output
  git_version_output=$("$1" --version 2>/dev/null)
  version_ge "$(major_minor "${git_version_output##* }")" "$(major_minor "$REQUIRED_GIT_VERSION")"
}

# Search PATH for the specified program that satisfies Homebrew requirements
find_tool() {
  if [[ $# -ne 1 ]]; then
    return
  fi

  local executable
  IFS=$'\n' # Do word splitting on new lines only
  for executable in $(which -a "$1" 2>/dev/null); do
    if "test_$1" "$executable"; then
      echo "$executable"
      break
    fi
  done
  IFS=$' \t\n' # Restore IFS to its default value
}

no_usable_ruby() {
  [[ -z $(find_tool ruby) ]]
}

outdated_glibc() {
  local glibc_version
  glibc_version=$(ldd --version | head -n1 | grep -o '[0-9.]*$' | grep -o '^[0-9]\+\.[0-9]\+')
  version_lt "$glibc_version" "$REQUIRED_GLIBC_VERSION"
}

if [[ -n "${HOMEBREW_ON_LINUX-}" ]] && no_usable_ruby && outdated_glibc
then
    abort "$(cat <<-EOFABORT
    Homebrew requires Ruby $REQUIRED_RUBY_VERSION which was not found on your system.
    Homebrew portable Ruby requires Glibc version $REQUIRED_GLIBC_VERSION or newer,
    and your Glibc version is too old.
    See ${tty_underline}https://docs.brew.sh/Homebrew-on-Linux#requirements${tty_reset}
    Install Ruby $REQUIRED_RUBY_VERSION and add its location to your PATH.
    EOFABORT
    )"
fi

# USER isn't always set so provide a fall back for the installer and subprocesses.
if [[ -z "${USER-}" ]]; then
  USER="$(chomp "$(id -un)")"
  export USER
fi

# Invalidate sudo timestamp before exiting (if it wasn't active before).
if ! /usr/bin/sudo -n -v 2>/dev/null; then
  trap '/usr/bin/sudo -k' EXIT
fi

# Things can fail later if `pwd` doesn't exist.
# Also sudo prints a warning message for no good reason
cd "/usr" || exit 1

####################################################################### script
if ! command -v git >/dev/null; then
    abort "$(cat </dev/null; then
    abort "$(cat </dev/null; then
      ohai "Select the Homebrew installation directory"
      echo "- ${tty_bold}Enter your password${tty_reset} to install to ${tty_underline}${HOMEBREW_PREFIX_DEFAULT}${tty_reset} (${tty_bold}recommended${tty_reset})"
      echo "- ${tty_bold}Press Control-D${tty_reset} to install to ${tty_underline}$HOME/.linuxbrew${tty_reset}"
      echo "- ${tty_bold}Press Control-C${tty_reset} to cancel installation"
    fi
    if have_sudo_access; then
      HOMEBREW_PREFIX="$HOMEBREW_PREFIX_DEFAULT"
    else
      HOMEBREW_PREFIX="$HOME/.linuxbrew"
    fi
    trap - SIGINT
  fi
  HOMEBREW_REPOSITORY="${HOMEBREW_PREFIX}/Homebrew"
fi
HOMEBREW_CORE="${HOMEBREW_REPOSITORY}/Library/Taps/homebrew/homebrew-core"

if [[ "${EUID:-${UID}}" == "0" ]]; then
  # Allow Azure Pipelines/GitHub Actions/Docker/Concourse/Kubernetes to do everything as root (as it's normal there)
  if ! [[ -f /proc/1/cgroup ]] ||
     ! grep -E "azpl_job|actions_job|docker|garden|kubepods" -q /proc/1/cgroup; then
    abort "Don't run this as root!"
  fi
fi

if [[ -d "${HOMEBREW_PREFIX}" && ! -x "${HOMEBREW_PREFIX}" ]]; then
  abort "$(cat </dev/null || return

  # we do it in four steps to avoid merge errors when reinstalling
  execute "git" "init" "-q"

  # "git remote add" will fail if the remote is defined in the global config
  execute "git" "config" "remote.origin.url" "${HOMEBREW_BREW_GIT_REMOTE}"
  execute "git" "config" "remote.origin.fetch" "+refs/heads/*:refs/remotes/origin/*"

  # ensure we don't munge line endings on checkout
  execute "git" "config" "core.autocrlf" "false"

  execute "git" "fetch" "--force" "origin"
  execute "git" "fetch" "--force" "--tags" "origin"

  execute "git" "reset" "--hard" "origin/master"

  if [[ "${HOMEBREW_REPOSITORY}" != "${HOMEBREW_PREFIX}" ]]; then
    execute "ln" "-sf" "${HOMEBREW_REPOSITORY}/bin/brew" "${HOMEBREW_PREFIX}/bin/brew"
  fi

  if [[ ! -d "${HOMEBREW_CORE}" ]]; then
    ohai "Tapping homebrew/core"
    (
      execute "/bin/mkdir" "-p" "${HOMEBREW_CORE}"
      cd "${HOMEBREW_CORE}" >/dev/null || return

      execute "git" "init" "-q"
      execute "git" "config" "remote.origin.url" "${HOMEBREW_CORE_GIT_REMOTE}"
      execute "git" "config" "remote.origin.fetch" "+refs/heads/*:refs/remotes/origin/*"
      execute "git" "config" "core.autocrlf" "false"
      execute "git" "fetch" "--force" "origin" "refs/heads/master:refs/remotes/origin/master"
      execute "git" "remote" "set-head" "origin" "--auto" >/dev/null
      execute "git" "reset" "--hard" "origin/master"

      cd "${HOMEBREW_REPOSITORY}" >/dev/null || return
    ) || exit 1
  fi

  execute "${HOMEBREW_PREFIX}/bin/brew" "update" "--force" "--quiet"
) || exit 1

if [[ ":${PATH}:" != *":${HOMEBREW_PREFIX}/bin:"* ]]; then
  warn "${HOMEBREW_PREFIX}/bin is not in your PATH.
  Instructions on how to configure your shell for Homebrew
  can be found in the 'Next steps' section below."
fi

ohai "Installation successful!"
echo

ring_bell

# Use an extra newline and bold to avoid this being missed.
ohai "Homebrew has enabled anonymous aggregate formulae and cask analytics."
echo "$(cat </dev/null || return
  execute "git" "config" "--replace-all" "homebrew.analyticsmessage" "true"
  execute "git" "config" "--replace-all" "homebrew.caskanalyticsmessage" "true"
) || exit 1

ohai "Next steps:"
case "$SHELL" in
  */bash*)
    if [[ -r "$HOME/.bash_profile" ]]; then
      shell_profile="$HOME/.bash_profile"
    else
      shell_profile="$HOME/.profile"
    fi
    ;;
  */zsh*)
    shell_profile="$HOME/.zprofile"
    ;;
  *)
    shell_profile="$HOME/.profile"
    ;;
esac
if [[ "$UNAME_MACHINE" == "arm64" ]] || [[ -n "${HOMEBREW_ON_LINUX-}" ]]; then
  cat <> ${shell_profile}
    eval "\$(${HOMEBREW_PREFIX}/bin/brew shellenv)"
EOS
fi
if [[ -n "${non_default_repos}" ]]; then
  s=""
  if [[ "${#additional_shellenv_commands[@]}" -gt 1 ]]; then
    s="s"
  fi
  echo "- Run these commands in your terminal to add the non-default Git remote${s} for ${non_default_repos}:"
  printf "    echo '%s' >> ${shell_profile}\n" "${additional_shellenv_commands[@]}"
  printf "    %s\n" "${additional_shellenv_commands[@]}"
fi

echo "- Run \`brew help\` to get started"
echo "- Further documentation: "
echo "    ${tty_underline}https://docs.brew.sh${tty_reset}"

if [[ -n "${HOMEBREW_ON_LINUX-}" ]]; then
  echo "- Install the Homebrew dependencies if you have sudo access:"

  if [[ $(command -v apt-get) ]]; then
    echo "    sudo apt-get install build-essential"
  elif [[ $(command -v yum) ]]; then
    echo "    sudo yum groupinstall 'Development Tools'"
  elif [[ $(command -v pacman) ]]; then
    echo "    sudo pacman -S base-devel"
  elif [[ $(command -v apk) ]]; then
    echo "    sudo apk add build-base"
  fi

  cat <

步骤2，通过命令/bin/bash brew_install，执行脚本：

运行脚本

运行脚本后.png

步骤3，通过命令 export PATH=$PATH:/opt/homebrew/bin，配置环境变量：

配置环境变量.png

这里非常感谢:
参考文章1
参考文章2

有什么错误欢迎批评指正 。