On 01/10/2013 04:01 PM, Wietse Venema wrote:
With the option to edit master.cf will come new opportunities
to destroy a configuration.
Below is a first design for a "backup before edit" option. If no
command is configured, then no backup will be made. If the backup
command fails, then the postconf command will not edit the file.
Wietse
postconf_backup_command (default: empty)
Optional external command that the postconf(1) command executes
before it attempts to modify the main.cf or master.cf file. The
macro "$file" is replaced by the absolute pathname of the file.
Note: the command is subject to $name expansion. Specify "$$"
to produce a single "$" character.
Example:
# This reuses the destination name when multiple edits are made
# within the same second.
backup_command = cp -p $file $file.saved.`date +%Y%m%d-%H%M%S`
I seem to recall that multi-line options are not supported and will not
be supported? And in master.cf, I see a lot of multi-line entries for
options for daemons. So I just had an interesting challenge with the
Dovecot addition. Here is the script that I was using:
cat <<EOF>>master.cf || exit 1
#
# Dovecot LDA
dovecot unix - n n - - pipe
flags=DRhu user=vmail:mail argv=/usr/libexec/dovecot/deliver -d ${recipient}
#
# Vacation mail
vacation unix - n n - - pipe
flags=Rq user=vacation argv=/var/spool/vacation/vacation.pl -f ${sender}
-- ${recipient}
EOF
And I was getting errors on sending emails until I REALLY looked at the
messages in maillog and figured out that I needed:
cat <<EOF>>master.cf || exit 1
#
# Dovecot LDA
dovecot unix - n n - - pipe
flags=DRhu user=vmail:mail argv=/usr/libexec/dovecot/deliver -d
\${recipient}
#
# Vacation mail
vacation unix - n n - - pipe
flags=Rq user=vacation argv=/var/spool/vacation/vacation.pl -f
\${sender} -- \${recipient}
EOF
So as you work on this feature, I really hope that multi-line will be
supported; or a way to add options to daemons. And also you will be able
to handle options that have $ in them and not like scripts handle them!
Boy did I feel dumb when I figured this one out....
