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Support -u username option.  Loosely based on FreeBSD's changes.
I've also restructured things a bit to cut the number of master.passwd
parses in half from 6 to 3.  We can't really get away with fewer than
that without sacrificing locality in the .db files.

.\"	$OpenBSD: pwd_mkdb.8,v 1.11 2000/11/26 01:23:12 millert Exp $
.\"
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.\"	from: @(#)pwd_mkdb.8	8.1 (Berkeley) 6/6/93
.\"
.Dd June 6, 1993
.Dt PWD_MKDB 8
.Os
.Sh NAME
.Nm pwd_mkdb
.Nd "generate the password databases"
.Sh SYNOPSIS
.Nm pwd_mkdb
.Op Fl c
.Op Fl p
.Op Fl d Ar directory
.Op Fl u Ar username
.Ar file
.Sh DESCRIPTION
.Nm
creates
.Xr db 3
style secure and insecure databases for the specified file.
These databases are then installed into
.Pa /etc/spwd.db
and
.Pa /etc/pwd.db ,
respectively.
The file is installed into
.Pa /etc/master.passwd .
The file must be in the correct format (see
.Xr passwd 5 ) .
It is important to note that the format used in this system is
different from the historic Version 7 style format.
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl c
Check if the password file is in the correct format.
Do not change, add, or remove any files.
.It Fl p
Create a Version 7 style password file and install it into
.Pa /etc/passwd .
.It Fl d Ar directory
Operate in a base directory other than the default of
.Pa /etc .
+.It Fl u Ar username
Only update the record for the specified user.  Utilities that
operate on a single user can use this option to avoid the
overhead of rebuilding the entire database.  This option must
never be used if the line number of the user's record in
.Pa /etc/master.passwd
has changed.
.It Ar file
The absolute path to a file in
.Ar master.passwd
format, as described in
.Xr passwd 5 .
.El
.Pp
The two databases differ in that the secure version contains the user's
encrypted password and the insecure version has an asterisk
.Pq Sq \&* .
.Pp
The databases are used by the C library password routines (see
.Xr getpwent 3 ) .
.Pp
.Nm
exits zero on success, non-zero on failure.
.Sh FILES
.Bl -tag -width /etc/master.passwd -compact
.It Pa /etc/master.passwd
current password file
.It Pa /etc/passwd
a Version 7 format password file
.It Pa /etc/pwd.db
insecure password database file
.It Pa /etc/pwd.db.tmp
temporary file
.It Pa /etc/spwd.db
secure password database file
.It Pa /etc/spwd.db.tmp
temporary file
.El
.Sh BUGS
Because of the necessity for atomic update of the password files,
.Nm
uses
.Xr rename 2
to install them.
This, however, requires that the file specified on the command line live
on the same file system as the
.Pa /etc
directory.
.Pp
There are the obvious races with multiple people running
.Nm
on different password files at the same time.
The front-ends to
.Nm pwd_mkdb ,
.Xr chpass 1 ,
.Xr passwd 1 ,
and
.Xr vipw 8
handle the locking necessary to avoid this problem.
.Sh COMPATIBILITY
Previous versions of the system had a program similar to
.Nm pwd_mkdb ,
.Xr mkpasswd 8 ,
which built
.Xr dbm 3
style databases for the password file but depended on the calling programs
to install them.
The program was renamed in order that previous users of the program
not be surprised by the changes in functionality.
.Sh SEE ALSO
.Xr chpass 1 ,
.Xr passwd 1 ,
.Xr db 3 ,
.Xr getpwent 3 ,
.Xr passwd 5 ,
.Xr vipw 8