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Message-ID: <4DF11C79.2000505@bednarz.ch>
Date: Thu, 09 Jun 2011 21:18:17 +0200
From: Thomas Bednarz <pub@bednarz.ch>
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To: pgsql-admin@postgresql.org
Subject: calling pg_dump from perl
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Hi everyone,

I try to do scheduled backups with a perl script on a windose box. For=20
some reason this does not work and I am to stupid to see the reason why. =

Maybe there is somebody out there who can help me.

Here is the relevant part of my perl script:

my $tm =3D localtime();
my $backupfile =3D sprintf("%s/PostgresDBBackup_%s_%s_%04s%02s%02s%02s%02=
s%02s.bak", $BackupPath, $hostname,
                          $DBName, $tm->year+1900, $tm->mon+1, $tm->mday,=
 $tm->hour, $tm->min, $tm->sec);
my $backupargs =3D sprintf("-f %s -F p --clean -U postgres -h localhost %=
s", $backupfile, $DBName);
my @args =3D ($pgbackup, $backupargs);
print "COMMAND: ".$pgbackup." ".$backupargs."\n";
my $status =3D system(@args);



The line starting with 'print "COMMAND: " '  outputs the command to the c=
onsole. It looks as follows:



COMMAND: E:\PostgreSQL\8.4SS\bin/pg_dump.exe -f=20
//nas-tb/DBBackups/PostgresDBBackup_TB-WS_misdwh_20110609151147.bak -F p =

--clean -U postgres -h localhost misdwh

If I execute this command on a Windows 'Shell' it works like a charm.=20
But when passed to the perl command system() it asks for a password!!! I =

guess that for whatever reason the command is not correctly formatted=20
when passed to the system() command, even though in the perl debugger=20
the values in the array @args look great!

The error message on the console looks as follows:


COMMAND: E:\PostgreSQL\8.4SS\bin/pg_dump.exe -f=20
//nas-tb/DBBackups/PostgresDBBackup_TB-WS_misdwh_20110609151147.bak -F p =

--clean -U postgres -h localhost misdwh
Passwort:
pg_dump: [Archivierer (DB)] Verbindung zur Datenbank =BBTB=AB=20
fehlgeschlagen: fe_sendauth: no password supplied
256

The interesting thing is, that it asks for a password for a database=20
named "TB". Only god knows where that comes from! The name of my=20
database is 'misdwh' and as can be seen on the command is passed as last =

parameter. When copy paste the command to a DOS box it works just fine=20
WITHOUT asking for a password, which means it finds it in the password fi=
le.

Does anybody see what the heck I am doing wrong here?

Many thanks for your help!

Thomas



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Content-Transfer-Encoding: 7bit

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>

    <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
  </head>
  <body bgcolor="#ffffff" text="#000000">
    Hi everyone,<br>
    <br>
    I try to do scheduled backups with a perl script on a windose box.
    For some reason this does not work and I am to stupid to see the
    reason why. Maybe there is somebody out there who can help me.<br>
    <br>
    Here is the relevant part of my perl script:<br>
    <br>
    <font color="black" face="Arial,Helvetica, sans-serif"><font
        color="black" face="Arial,Helvetica, sans-serif">
        <pre><big>my $tm = localtime(); 
my $backupfile = sprintf("%s/PostgresDBBackup_%s_%s_%04s%02s%02s%02s%02s%02s.bak", $BackupPath, $hostname, 
                         $DBName, $tm-&gt;year+1900, $tm-&gt;mon+1, $tm-&gt;mday, $tm-&gt;hour, $tm-&gt;min, $tm-&gt;sec); 
my $backupargs = sprintf("-f %s -F p --clean -U postgres -h localhost %s", $backupfile, $DBName); 
my @args = ($pgbackup, $backupargs); 
print "COMMAND: ".$pgbackup." ".$backupargs."\n"; 
my $status = system(@args);



The line starting with 'print "COMMAND: " '  outputs the command to the console. It looks as follows:


</big></pre>
      </font></font><font color="black" face="Arial,Helvetica,
      sans-serif"><font color="black" face="Arial,Helvetica, sans-serif">COMMAND:

        E:\PostgreSQL\8.4SS\bin/pg_dump.exe -f
        //nas-tb/DBBackups/PostgresDBBackup_TB-WS_misdwh_20110609151147.bak
        -F p --clean -U postgres -h localhost misdwh<br>
        <br>
        If I execute this command on a Windows 'Shell' it works like a
        charm. But when passed to the perl command system() it asks for
        a password!!! I guess that for whatever reason the command is
        not correctly formatted when passed to the system() command,
        even though in the perl debugger the values in the array @args
        look great!<br>
        <br>
        The error message on the console looks as follows:<br>
        <br>
        <br>
      </font></font><font color="black" face="Arial,Helvetica,
      sans-serif"><font color="black" face="Arial,Helvetica, sans-serif">COMMAND:

        E:\PostgreSQL\8.4SS\bin/pg_dump.exe -f
        //nas-tb/DBBackups/PostgresDBBackup_TB-WS_misdwh_20110609151147.bak
        -F p --clean -U postgres -h localhost misdwh <br>
        Passwort: <br>
        pg_dump: [Archivierer (DB)] Verbindung zur Datenbank &raquo;TB&laquo;
        fehlgeschlagen: fe_sendauth: no password supplied <br>
        256 <br>
        <br>
        The interesting thing is, that it asks for a password for a
        database named "TB". Only god knows where that comes from! The
        name of my database is 'misdwh' and as can be seen on the
        command is passed as last parameter. When copy paste the command
        to a DOS box it works just fine WITHOUT asking for a password,
        which means it finds it in the password file.<br>
        <br>
        Does anybody see what the heck I am doing wrong here?<br>
        <br>
        Many thanks for your help!<br>
        <br>
        Thomas<br>
        <br>
        <br>
      </font></font>
  </body>
</html>

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