ref: fc77a2d3d384c1ee854deebd4f1a97e751d7eaa2
dir: /sys/man/4/upasfs/
.TH UPASFS 4 .SH NAME upasfs, startupasfs \- mail file server .SH SYNOPSIS .B upas/fs [ .B -f .I mailbox ] [ .B -bnps ] [ .B -m .I mntpoint ] .PP .B startupasfs .SH DESCRIPTION .I Fs is a user level file system that reads mailboxes and presents them as a file system. A user normally starts .I fs in his/her profile after starting .IR plumber (4) and before starting a window system, such as .IR rio (1) or .IR acme (1). The file system is used by .I nedmail and .IR acme (1)'s mail reader to parse messages. .I Fs also generates plumbing messages used by .IR biff and .IR faces (1) to provide mail announcements. .PP .I Startupasfs is a shell script suitable for use in one's profile. It runs .B "fs -s" for the invoking user if none is already running, and always mounts the user's posted .I fs on .BR /mail/fs . .PP The mailbox itself becomes a directory under .BR /mail/fs . Each message in the mailbox becomes a numbered directory in the mailbox directory, and each attachment becomes a numbered directory in the message directory. Since an attachment may itself be a mail message, this structure can recurse ad nauseam. .PP Each message and attachment directory contains the files: .TP 1.4i .B body .PD 0 the message minus the RFC822 style headers .TP .B cc the address(es) from the CC: header .TP .B date the date in the message, or if none, the time of delivery .TP .B digest an SHA1 digest of the message contents .TP .B disposition .B inline or .B file .TP .B filename a name to use to file an attachment .TP .B from the from address in the From: header, or if none, the address on the envelope. .TP .B header the RFC822 headers .TP .B info described below, essentially a summary of the header info .TP .B inreplyto contents of the .B in-reply-to: header .TP .B mimeheader the mime headers .TP .B raw the undecoded MIME message .TP .B rawbody the undecoded message body .TP .B rawheader the undecoded message header .TP .B replyto the address to send any replies to. .TP .B subject the contents of the subject line .TP .B to the address(es) from the To: line. .TP .B type the MIME content type .TP .B unixheader the envelope header from the mailbox .PD .PP The .B info file contains the following information, one item per line. Lists of addresses are single-space separated. .LP .2C .PD 0 .LP .TP 2i .I "sender address .TP .I "recipient addresses .TP .I "cc addresses .TP .I "reply address .TP .I "envelope date .TP .I "subject .TP .I "MIME content type .TP .I "MIME disposition .TP .I filename .TP .I "SHA1 digest .TP .I "bcc addresses .TP .I "in-reply-to: contents .TP .I "RFC822 date .TP .I "message senders .TP .I "message id .TP .I "number of lines in body .LP .1C .PD .PP Deleting message directories causes the message to be removed from the mailbox. .PP The mailbox is reread and the structure updated whenever the mailbox changes. Message directories are not renumbered. .PP The file .B /mail/fs/ctl is used to direct .I fs to open/close new mailboxes or to delete groups of messages atomically. The messages that can be written to this file are: .TF "delete\fI mboxname number ...\fP .TP .BI open " path mboxname" opens a new mailbox. .I path is the file to open, and .I mboxname is the name that appears under .BR /mail/fs . .TP .BI close " mboxname" close .IR mboxname . The close takes affect only after all files open under .BI /mail/fs/ mboxname have been closed. .TP .BI delete " mboxname number ..." Delete the messages with the given numbers from .IR mboxname. .PD .PP The options are: .TF "-f\fI file .TP .BI -f file use .I file as the mailbox instead of the default, .BI /mail/box/ username /mbox. .PD 0 .TP .B -b stands for biffing. Each time new mail is received, a message is printed to standard output containing the sender address, subject, and number of bytes. It is intended for people telnetting in who want mail announcements. .TP .B -n Don't open a mailbox initially. Overridden by -f. .TP .B -p turn off plumbing. Unless this is specified, .I fs sends a message to the plumb port, .BR seemail , from source .B mailfs for each message received or deleted. The message contains the attributes .BI sender= "<contents of " from " file>," .BR filetype=mail , .BR "mailtype=deleted\fI or \fPnew" , and .BI length= "<message length in bytes>." The contents of the message is the full path name of the directory representing the message. .TP .B -s causes .I fs to post itself in .B /srv with a name of the form .BI /srv/upasfs. user. .TP .B -m specifies a mount point other than .BR /mail/fs . .PD .PP .I Fs will exit once all references to its directory have disappeared. .PP .I Fs interprets mailbox file names of the form .BI / proto / host / user to mean access an account on .I host using the given protocol. Authentication is delegated to .IR factotum (4). The final .BI / user may be omitted, in which case the user name is gleaned from the key held by .IR factotum . The following protocols are supported: .PP .TF apoptls .TP .B pop cleartext POP with password authentication .TP .B apop cleartext POP with challenge-response (APOP) authentication .TP .B pops .TP .B poptls TLS-encrypted POP with password authentication .TP .B apops .TP .B apoptls TLS-encrypted POP with challenge-response (APOP) authentication .TP .B imap cleartext IMAP .TP .B imaps TLS-encrypted IMAP .PD .PP The two IMAP protocols allow an optional fourth field specifying a mailbox name, for example .BR /imap/server/user/stored . .PP .B Poptls and .B apoptls connect to port 110 in plaintext and start TLS using the POP STLS command. .B Pops and .B apops connect to port 995 and start TLS before initiating the POP conversation. .B Imaps connects to port 993 and starts TLS before initiating the IMAP conversation. There should probably be an .B imaptls protocol as well. .RB ( Imaptls would connect to port 143 in plaintext and start TLS using the IMAP STARTTLS command. (That's the nice thing about standards\(emthere's so many to choose from.)) .SH FILES .TF /mail/box/*/dead.letter .TP .B /mail/box/* mail directories .TP .B /mail/box/*/mbox mailbox files .TP .B /mail/box/*/L.reading mutual exclusion lock for multiple mbox readers .TP .B /mail/box/*/L.mbox mutual exclusion lock for altering mbox .br .ne 3 .SH SOURCE .B /sys/src/cmd/upas/fs .br .B /rc/bin/startupasfs .SH "SEE ALSO" .IR aliasmail (8), .IR faces (1), .IR filter (1), .IR mail (1), .IR marshal (1), .IR mlmgr (1), .IR nedmail (1), .IR qer (8), .IR rewrite (6), .IR send (8), .IR upasfs (4)