harvey/sys/man/8/fossilcons

.TH FOSSILCONS 8
.SH NAME
fossilcons \- fossil console commands
.SH SYNOPSIS
.B
con /srv/fscons
.PP
.PD 0.1
.B .
.I file
.PP
.B 9p
.I T-message
...
.PP
.B dflag
.PP
.B echo
[
.B -n
]
[
.I arg
...
]
.PP
.B listen
[
.B -d
]
[
.I address
]
.PP
.B msg
[
.B -m
.I nmsg
]
[
.B -p
.I nproc
]
.PP
.B uname
.I uname
[
.I uid
|
.BI : uid
|
.BI % newname
|
.BI = leader
|
.BI + member
|
.BI - member
]
.PP
.B users
[
.B -dw
|
.I file
]
.PP
.B srv
[
.B -dp
]
.I name
.sp
.PP
.B fsys
.I name
.PP
.B fsys
.I name
.B config
.I device
.PP
.B fsys
.I name
.B venti
.B -d
|
[
.B -r
]
[
.I host
]
.PP
.B fsys
.I name
.B open
[
.B -APWr
]
[
.B -c
.I ncache
]
.PP
[
.B fsys
.I name
]
.B close
.PP
.B fsys
.I name
.B unconfig
.sp
.PP
[
.B fsys
.I name
]
.B bfree
.I addr
.PP
[
.B fsys
.I name
]
.B block
.I addr
.I offset
[
.I count
[
.I data
]]
.PP
[
.B fsys
.I name
]
.B clre
.I addr
.I offsets
\&...
.PP
[
.B fsys
.I name
]
.B clri
.I files
\&...
.PP
[
.B fsys
.I name
]
.B clrp
.I addr
.I offset
\&...
.PP
[
.B fsys
.I name
]
.B create
.I path
.I uid
.I gid
.I perm
.PP
[
.B fsys
.I name
]
.B epoch
[
.B -y
]
.I n
.PP
[
.B fsys
.I name
]
.B label
.I addr
[
.I type
.I state
.I epoch
.I epochclose
.I tag
]
.PP
[
.B fsys
.I name
]
.B remove
.I files
\&...
.PP
[
.B fsys
.I name
]
.B snap
[
.B -a
]
.PP
[
.B fsys
.I name
]
.B snaptime
[
.B -a
.I hhmm
]
[
.B -s
.I interval
]
.PP
[
.B fsys
.I name
]
.B stat
.IR files ...
.PP
[
.B fsys
.I name
]
.B sync
.PP
[
.B fsys
.I name
]
.B vac
.I dir
.PP
[
.B fsys
.I name
]
.B wstat
.I file
.I elem
.I uid
.I gid
.I perm
.I length
.SH DESCRIPTION
These are configuration and maintenance commands
executed at the console of a 
.IR fossil (4)
file server.
The commands are split into three groups above:
file server configuration,
file system configuration,
and file system maintenance.
This manual page is split in the same way.
.SS File server configuration
.PP
The
dot
.RI ( . )
command
reads
.IR file ,
treating each line as a command to be executed.
Blank lines and lines beginning with a 
.L #
character are ignored.
Note that
.I file
is a file in the name space in which
.I fossil
was started,
.I not
a file in any file system served by
.IR fossil .
.PP
.I 9p
executes a 9P transaction; the arguments
are in the same format used by
.IR 9pcon (8).
.PP
.I Dflag
toggles the debug flag and prints the new setting.
When the debug flag is set, all protocol messages
and information about authentication is printed to
standard error.
.PP
.I Echo
behaves identically to
.IR echo (1),
writing to the console.
.PP
.I Listen
manages the network addresses at which
fossil is listening.
With no arguments,
.I listen
prints the current list of addresses and their network directories.
With one argument, listen
.I address
starts a new listener at
.IR address ;
the
.B -d
flag causes 
.I listen
to remove the listener
at the given address.
.PP
.I Msg
prints the maximum internal 9P message queue size
and the maximum number of 9P processes to
allocate for serving the queue.
The
.B -m
and
.B -p
options set the two variables.
.PP
.I Uname
displays or edits one entry the in-memory user table.
If the in-memory table was read from a file
(see the
.I users
command below),
the new table is written to
.IR /active/adm/users .
There is no distinction between users and groups:
a user is a group with one member.
The user table records a mapping between
uids and unames, as well as recording the
leader and members of each group.
A
.I uid
is a string naming a user or group
and stored in the on-disk data structures.
A
.I uname
is the string naming a user or group and
used in 9P protocol messages.
There is a distinction so that unames can be
safely reused, even though uids cannot.
The first argument to
.I uname
is (confusingly) a
uname
.RI ` uname .'
The second argument is an optional verb, one of:
.TP
.I uid
add the user with uname
.RI ` uname '
and uid
.RI ` uid ,'
creating a home directory
.BI /active/usr/ uname \fR.
.TP
.BI : uid
add the user but do not create the home directory
.TP
.BI % newname
rename
.RI ` uname '
to
.RI ` newname ,'
throughout the user table
.TP
.BI = leader
set the group leader to the uname
.IR leader .
.TP
.BI + member
add the uname
.RI ` member '
to the group
.TP
.BI - member
remove the uname
.RI ` member '
from the group
.LP
If the verb is omitted, the entire entry for
.I uname
is printed, in the form:
.IP
.IB uid : uname : leader :\fImembers
.LP
where
.I members
is a comma-separated list of unames.
.PP
.I Users
reads
.IR file
from the file system named
.B main
and uses it to initialize the user table.
With no arguments,
.I users
prints the file name of the current user table.
.PP
The user table is a list of lines in the form printed
by the
.I uname
command.
The
.B -d
flag resets the user table to the default:
.IP
.EX
adm:adm:adm:sys
none:none::
noworld:noworld::
sys:sys::
.EE
.PP
These users are mandatory and must appear in all user files read.
It is not possible to rename these unames.
.PP
The
.B -w
flag causes the file
.I /active/adm/users
to be written with the current in-memory table.
The path
.I /active/adm
must exist.
.PP
.I Srv
behaves like listen but uses
.BI /srv/ name
rather than a network address.
With the
.B -p
flag, 
.I srv 
edits a list of console services rather than 9P services.
.SS File system configuration
.I Fsys
sets the current file system to
.IR name ,
which must be configured and open (q.v.).
The current file system name is
displayed as the file server prompt.
.PP
.I Fsys
takes as an optional argument
(after
.BR name )
a command to execute on the named file system.
Most commands require that the named file system
be configured and open; these commands can be invoked
without the
.BI fsys " name
prefix, in which case the current file system is used.
A few commands
.RB ( config ,
.BR open ,
and
.BR unconfig )
operate on unopened file systems; they require the prefix.
.PP
.I Config
creates a new file system named
.I name
using disk file
.I device .
This just adds an entry to fossil's internal table.
.PP
.I Venti
establishes a connection to the Venti server
.I host
(by default, the environment variable
.B $venti
or the network variable
.BR $venti )
for use by the named file system.
If no
.I venti
command is issued before
.IR open ,
the default Venti server will be used.
The
.B -d
flag closes the connection to the Venti server
and can only be used when the file system is closed.
The
.B -r
flag redials the Venti server and can only
be used when the file system is open;
.I host
must be given again.
.PP
.I Open
opens the file system, reading the
root and super blocks and allocating an in-memory
cache for disk and Venti blocks.
The options are:
.TP
.B -A
run with no authentication
.TP
.B -P
run with no permission checking
.TP
.B -W
allow wstat to make arbitrary changes to the user and group fields
.TP
.B -r
open the file system read-only
.TP
.BI -c " ncache
allocate an in-memory cache of 
.I ncache
(by default, 1000)
blocks
.PP
.I Close
flushes all dirty file system blocks to disk
and then closes the device file.
.PP
.I Unconfig
removes the named file system (which must be closed)
from fossil's internal table.
.SS File system maintenance
.I Bfree
marks the block at disk address
.I addr
as available for allocation.
Before doing so, it prints a
.I label
command (q.v.)
that can be used to restore the block to its previous state.
.PP
.I Block
displays (in hexadecimal)
the contents of the block at disk address
.IR addr ,
starting at
.I offset
and continuing for
.I count
bytes or until the end of the block.
If 
.I data
(also hexadecimal)
is given, the contents in that range are
replaced with data.
When writing to a block,
.I block
prints the old and new contents,
so that the change is easily undone.
Editing blocks is discouraged.
.PP
.I Clre
zeros an entry from a disk block.
Before doing so, it prints a
.I block
command that can be used 
to restore the entry.
.PP
.I Clri
removes the internal directory entry
and abandons storage associated with
.IR files .
It ignores the usual rules for sanity, such as checking against
removing a non-empty directory.
A subsequent
.I flchk
(see
.IR fossil (4))
will identify the abandoned storage so it can be reclaimed with
.I bfree
commands.
The
.I perm
is formatted as described in the
.I stat
command ;
creating files or directories with the
snapshot
.RB ( s )
bit set is not allowed.
.PP
.I Clrp
zeros a pointer in a disk block.
Before doing so, it prints a 
.I block
command that can be used to restore the entry.
.PP
.I Create
creates a file on the current file system.
.I Uid
and
.I gid
are uids
.RI ( not
unames;
see the discussion above, in the description
of the 
.I uname
command).
.I Perm
is the low 9 bits of the permission mode of the file,
in octal.
The 
.BR -a ,
.BR -d ,
and
.B -l
flags set the append-only, directory, and lock bits.
.PP
.I Epoch
sets the low file system epoch.
Snapshots in the file system are given increasing epoch numbers.
The file system maintains a low and a high epoch number,
and only allows access to snapshots in that range.
The low epoch number can be moved forward to discard old snapshots
and reclaim the disk space they occupy.
(The high epoch number is always the epoch of the currently
active file system.)
.PP
The command
``\fLepoch\fI n''\fR
is used to propose changing the low epoch to
.IR n .
In response, 
.I fossil
scans
.B /archive
and
.B /snapshot
for snapshots that would be discarded, printing their
epoch numbers and the
.I clri
commands necessary to remove them.
The epoch is changed only if no such paths are found.
The usual sequence of commands is (1) run epoch to
print the snapshots and their epochs, (2) clri some snapshots,
(3) run epoch again.
If the file system is completely full (there are no free blocks),
.I clri
may fail because it needs to allocate blocks.
For this situation,
the
.B -y
flag to epoch forces the epoch change even when
it means discarding currently accessible snapshots.
Note that when there are still snapshots in
.BR /archive ,
the archiver should take care
of those snapshots (moving the blocks from disk to Venti)
if you give it more time.
.PP
.I Label
displays and edits the label associated with a block.
When editing, a parameter of
.B -
means leave that field unchanged.
Editing labels is discouraged.
.PP
.I Remove
removes
.IR files .
.PP
.I Snap
takes a temporary snapshot of the current file system,
recording it in 
.BI /snapshot/ yyyy / mmdd / hhmm \fR,
as described in 
.IR fossil (4).
The
.B -a
flag causes 
.I snap
to take an archival snapshot, recording it in
.BI /archive/ yyyy / mmdd \fR,
also described in
.IR fossil (4).
.PP
.I Snaptime
displays and edits the times at which snapshots are automatically
taken.
An archival snapshot is taken once a day, at
.IR hhmm ,
while temporary snapshots are taken at multiples of
.I interval
minutes.
With no arguments,
.I snaptime
prints the current snapshot times.
The
.B -a
and
.B -s
options set the archive and snapshot times.
An
.I hhmm
or
.I interval
of
.L none
can be used to disable that kind of automatic snapshot.
By default, both are disabled.
.PP
.I Stat
displays metadata for each of the named
.IR files ,
in the form:
.IP
.EX
stat \fIfile elem uid gid perm length
.EE
.LP
(Replacing
.B stat
with
.B wstat
yields a valid command.)
The
.I perm
is an octal number less than or equal to 777,
prefixed with any of the following letters
to indicate additional bits.
.IP
.EX
.ta +4n
a	\fRappend only
d	\fRdirectory
l	\fRexclusive use
s	\fRis the root of a snapshot
A	\fRMS-DOS archive bit
G	\fRsetgid
H	\fRMS-DOS hidden bit
L	\fRsymbolic link
S	\fRMS-DOS system bit
T	\fRMS-DOS temporary bit
U	\fRsetuid
Y	\fRsticky
.EE
The bits denoted by capital letters are included
to support non-Plan 9 systems.
They are not made visible by the 9P protocol.
.PP
.I Sync
writes dirty blocks in memory to the disk.
.PP
.I Vac
prints the Venti score for a
.IR vac (1)
archive containing the tree rooted
at
.IR dir ,
which must already be archived to Venti
(typically
.IR dir
is a directory in the
.B /archive
tree).
.PP
.I Wstat
changes the metadata of the named
.IR file .
Specifying
.B -
for any of the fields means ``don't change.''
Attempts to change the
.B d
or
.B s
bits in the
.I perm
are silently ignored.
.SH EXAMPLE
.IR Sources ,
the Plan 9 distribution file server,
uses the following configuration file:
.IP
.EX
srv -p fscons.sources
srv -p fscons.sources.adduserd
srv sources
fsys main config /dev/sdC0/fossil.outside
fsys main open -c 25600
fsys main
users /active/adm/users
listen tcp!*!564
msg -m 40 -p 10
snaptime -a 0000 -s 15
.EE
.LP
The second console is used by the daemon
that creates new accounts.