.TH MKFS 8
.SH NAME
mkfs, mkext \- archive or update a file system
.SH SYNOPSIS
.B disk/mkfs
.RB [ -aprvoxU ]
.RB [ -d
.IR root ]
.RB [ -s
.IR source ]
.RB [ -z
.IR n ]
.I proto ...
.PP
.B disk/mkext
.RB [ -d
.IR name ]
.RB [ -u ]
.RB [ -h ]
.RB [ -v ]
.RB [ -x ]
.RB [ -T ]
.I file ...
.SH DESCRIPTION
.I Mkfs
copies files from the file tree
.I source
(default
.BR / )
to a new file system
.I root
(default
.BR /n/newfs ).
The
.I proto
files are read
(see
.IR proto (2)
for their format)
and any files specified in them that are out of date are copied.
.PP
.I Mkfs
copies only those files that are out of date.
Such a file is first copied into a temporary
file in the appropriate destination directory
and then moved to the destination file.
Files that are not specified in the
.I proto
file
are not updated and not removed.
.PP
The options to
.I mkfs
are:
.TF "s source"
.TP
.B a
Instead of writing to new file system,
write an archive file to standard output, suitable for
.IR mkext .
All files in
.IR proto ,
not just those out of date, are archived.
.TP
.B x
For use with
.BR -a ,
this option writes a list of file names, dates, and sizes to standard output
rather than producing an archive file.
.TP
.B o
Similar to
.BR -x
above, but produces a list of source file names to standard output
rather than producing an archive file.
.TP
.BI "d " root
Copy files into the tree rooted at
.I root 
(default
.BR /n/newfs ).
This option suppresses setting the
.B uid
and
.B gid
fields when copying files.
Use
.B -U
to reenable it. 
.TP
.B p
Update the permissions of a file even if it is up to date.
.TP
.B U
Update of uid and gid of the target files.
.TP
.B r
Copy all files.
.TP
.BI "s " source
Copy from files rooted at the tree
.IR source .
.TP
.B v
Print the names of all of the files as they are copied.
.TP
.BI "z " n
Copy files assuming block size
.I n
(default 1024)
bytes long.
If a block contains only 0-valued bytes, it is not copied.
.PD
.PP
.I Mkext
unpacks archive files made by the
.B -a
option of
.IR mkfs .
Each file on the command line is unpacked in one pass through the archive.
If the file is a directory,
all files and subdirectories of that directory are also unpacked.
When a file is unpacked, the entire path is created if it
does not exist.
If no files are specified, the entire archive is unpacked;
in this case, missing intermediate directories are not created.
The options are:
.TP
.B d
specifies a directory (default
.BR / )
to serve as the root of the unpacked file system.
.TP
.B u
sets the owners of the files created to correspond to
those in the archive and restores the modification times of the files.
.TP
.B T
restores only the modification times of the files.
.TP
.B v
prints the names and sizes of files as they are extracted.
.TP
.B h
prints headers for the files on standard output
instead of unpacking the files.
.PD
.SH EXAMPLES
.PP
Make an archive to establish a new file system:
.IP
.EX
disk/mkfs -a -s dist proto > arch
.EE
.PP
Unpack that archive onto a new file system:
.IP
.EX
srv newfs
mount -c /srv/newfs /n/newfs
disk/mkext -u -d /n/newfs < arch
.EE
.SH SOURCE
.B /sys/src/cmd/disk/mkfs.c
.br
.B /sys/src/cmd/disk/mkext.c
.SH "SEE ALSO"
.IR prep (8),
.IR sd (3),
.IR tar (1)