102 lines
2.2 KiB
Bash
Executable file
102 lines
2.2 KiB
Bash
Executable file
#!/bin/rc
|
|
|
|
# Serve Unix u9fs over SSH
|
|
#
|
|
# Basically, try each of the following until you find one that works:
|
|
#
|
|
# srvssh unix
|
|
# srvssh -r unix
|
|
# srvssh -R unix
|
|
# srvssh -r -s unix
|
|
# srvssh -R -s unix
|
|
#
|
|
# and then never look back. Note that "srvssh unix" should always
|
|
# work. It's just that if you're talking with certain sshd's, you'll get
|
|
# hit by Nagle's algorithm and need to explore the other flags.
|
|
|
|
# When using ssh to start u9fs, the only way to turn off
|
|
# Nagle's algorithm (which kills the performance of RPC-based
|
|
# protocols like 9P) is to allocate a pseudo-terminal. The
|
|
# command ssh -Rmp attempts to allocate a pseudo-terminal and
|
|
# then put it in a transparent mode. Especially when
|
|
# connected to older SSH daemons, the connection ends up not
|
|
# quite transparent. To get around this, we explicity set the tty
|
|
# mode on the command line as well. The hope is that -Rmp makes
|
|
# the connection transparent enough for the Tversion, and the stty
|
|
# command will do the rest. If -Rmp doesn't make the connection
|
|
# transparent enough for the Tversion (but the stty commands do
|
|
# make the connection fully transparent) then add "-s 5" to the srv
|
|
# command to tell it to wait 5 seconds before sending the Tversion.
|
|
# That should be enough time for the stty to take effect.
|
|
|
|
rfork e
|
|
|
|
fn usage {
|
|
echo 'usage: srvssh [-R] [-r] [-s] [-u u9fspath] system [srvname [mtpt]]' >[1=2]
|
|
exit usage
|
|
}
|
|
|
|
rawhack=''
|
|
sleephack=()
|
|
u9fspath=u9fs
|
|
rawflags=''
|
|
|
|
while(~ $1 -*){
|
|
switch($1){
|
|
case -r
|
|
rawflags='-Rmp'
|
|
shift
|
|
case -R
|
|
rawflags='-Rmp'
|
|
rawhack=('stty raw -echo '';''')
|
|
shift
|
|
case -s
|
|
sleephack=(-s 5)
|
|
shift
|
|
case -u
|
|
shift
|
|
u9fspath=$1
|
|
shift
|
|
case -u*
|
|
u9fspath=`{echo $1 | sed s/-u//}
|
|
shift
|
|
case *
|
|
usage
|
|
}
|
|
}
|
|
|
|
if(! ~ $#* 1 2 3)
|
|
usage
|
|
|
|
switch($#*){
|
|
case 1
|
|
srv=$1
|
|
mtpt=/n/$1
|
|
case 2
|
|
srv=$2
|
|
mtpt=/n/$1
|
|
case 3
|
|
srv=$2
|
|
mtpt=$3
|
|
}
|
|
|
|
x=(srv $sleephack -e \
|
|
'ssh '$rawflags' '$1' '$rawhack' '$u9fspath' -na none -u ''$''USER -l ''$''HOME/u9fs.log' \
|
|
$srv $mtpt)
|
|
$x
|
|
|
|
# Sometimes /srv/whatever can be a closed pipe, in which case
|
|
# srv will have been killed for writing to it, without a chance to
|
|
# defend itself. Rerun it in this case.
|
|
|
|
ss=$status
|
|
if(~ $ss *'write on closed pipe'*){
|
|
rm -f /srv/$srv
|
|
$x
|
|
ss=$status
|
|
}
|
|
|
|
if(! ~ $ss '')
|
|
echo srvssh: $ss >[1=2]
|
|
exit $ss
|