install_python37_on_centos_7.sh

#!/bin/sh

# Run this script on Centos 7 to quickly install python 3 and relavent
# packages to run python 3 applications, including pip, virtualenv.
# Will use a local yum repository at `172.16.8.113` to speed up.

if ! grep -q "CentOS Linux release 7" /etc/redhat-release; then
  echo Not centos 7, will soon abort
  exit 1
fi

if python3.7 -c 'import zlib' 2>/dev/null && pip 2>/dev/null && gcc --version 2>/dev/null && virtualenv --version 2>/dev/null; then
  echo "Software already installed"
  exit 0
else
  echo "Software need to be installed"
fi

echo '--------------------------'
echo Will backup repo files in /etc/yum.repos.d/ to /etc/yum.repos.d/bak/

mkdir /etc/yum.repos.d/bak
mv /etc/yum.repos.d/*.repo /etc/yum.repos.d/bak/

cat <<EOF >/etc/yum.repos.d/local-repos.repo
[local-base]
name=CentOS Base
baseurl=http://172.16.8.87/base/
gpgcheck=0
enabled=1
[local-centosplus]
name=CentOS CentOSPlus
baseurl=http://172.16.8.87/centosplus/
gpgcheck=0
enabled=1
[local-extras]
name=CentOS Extras
baseurl=http://172.16.8.87/extras/
gpgcheck=0
enabled=1
[local-updates]
name=CentOS Updates
baseurl=http://172.16.8.87/updates/
gpgcheck=0
enabled=1
EOF

mkdir -p /root/.config/pip
cat <<EOF >/root/.config/pip/pip.conf
[global]
timeout = 60
index-url = http://pypi.douban.com/simple
trusted-host = pypi.douban.com
EOF


echo '--------------------------'
echo Will install packages for python3 environment

yum -y install python3 python3-pip # python3-devel
yum -y group install "Development Tools"
# tools for ordinary python package build
yum install -y openssl-devel bzip2-devel libffi-devel ncurses ncurses-devel readline readline-devel \
sqlite sqlite-devel


install_python3_7() {
  cd /usr/src
  tar tzf Python-3.7.4.tgz >/dev/null 2>&1 || curl -OL https://www.python.org/ftp/python/3.7.4/Python-3.7.4.tgz
  tar zxf Python-3.7.4.tgz
  cd Python-3.7.4
  
  # python 2 or 3 are both ok for following script
  python <<<"
with open('Modules/Setup.dist') as f1:
  cnt=f1.read()
  cnt=cnt.replace('#zlib zlibmodule.c -I\$(prefix)/include -L\$(exec_prefix)/lib -lz', 'zlib zlibmodule.c -I\$(prefix)/include -L\$(exec_prefix)/lib -lz')
  cnt=cnt.replace('#readline readline.c -lreadline -ltermcap', 'readline readline.c -lreadline -ltermcap')
  cnt=cnt.replace('#_curses _cursesmodule.c -lcurses -ltermcap', '_curses _cursesmodule.c -lcurses -ltermcap')
  cnt=cnt.replace('#syslog syslogmodule.c\t\t# syslog daemon interface', 'syslog syslogmodule.c          # syslog daemon interface')
  cnt=cnt.replace('#_curses_panel _curses_panel.c -lpanel -lncurses', '_curses_panel _curses_panel.c -lpanel -lncurses')
  with open('Modules/Setup.dist', 'w') as f2:
    f2.write(cnt)
"
  ./configure --enable-optimizations  # CPPFLAGS='-I/opt/zlib/include' LDFLAGS='-L/opt/zlib/lib'
  make altinstall
  # rm -f /usr/src/Python-3.7.4.tgz

  python3.7 -V
}

python3.7 -c 'import zlib' || install_python3_7

pip3 install virtualenv