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GitHub Repository: sagemathinc/cocalc
 Path: blob/master/src/dev/minimal/start_postgres.py
Views: 687
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#!/usr/bin/env python

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"""

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This is a script for starting postgres for development purposes on a laptop.

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"""

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import os, sys, time, util

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path = os.path.split(os.path.realpath(__file__))[0]; os.chdir(path); sys.path.insert(0, path)

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PG_DATA = os.path.join(path, "postgres_data")

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if not os.path.exists(PG_DATA):

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    util.cmd("pg_ctl init -D '%s'"%PG_DATA)

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    # Lock down authentication so it is ONLY via unix socket

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    open(os.path.join(PG_DATA,'pg_hba.conf'), 'w').write(

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"""

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# This is safe since we only enable a socket protected by file system permissions:

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local all all trust

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# You can uncomment this and comment out the above if you want to test password auth.

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#local all all md5

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""")

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    # Make it so the socket is in this subdirectory, so that it is

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    # protected by UNIX permissions.  This approach avoids any need

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    # for accounts/passwords for development and the Docker image.

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    conf = os.path.join(PG_DATA, 'postgresql.conf')

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    s = open(conf).read()

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    s += '\n'

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    # Move the default directory where the socket is from /tmp to right here.

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    socket_dir = os.path.join(PG_DATA, 'socket')

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    s += "unix_socket_directories = '%s'\nlisten_addresses=''\n"%socket_dir

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    os.makedirs(socket_dir)

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    util.cmd("chmod og-rwx '%s'"%PG_DATA)  # just in case -- be paranoid...

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    open(conf,'w').write(s)

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    # Create script so that clients will know where socket dir is.

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    open("postgres-env", 'w').write("""#!/bin/sh

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export PGUSER='smc'

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export PGHOST='%s'

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"""%socket_dir)

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    util.cmd('chmod +x postgres-env')

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    # Start database running in background as daemon

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    util.cmd("postgres -D '%s' >%s/postgres.log 2>&1 &"%(PG_DATA, PG_DATA))

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    time.sleep(5)

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    # Create the smc user with no password (not needed since we are using local file permissions)

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    util.cmd("unset PGUSER; unset PGHOST; createuser -h '%s' -sE smc"%socket_dir)

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    # Stop database daemon

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    util.cmd("kill %s"%(open(os.path.join(PG_DATA, 'postmaster.pid')).read().split()[0]))

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    # Let it die and remove lock file.

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    time.sleep(3)

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util.cmd("postgres -D '%s'"%PG_DATA)

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