"server" entry may not be added to /etc/hosts by screen.d/ldm script

Bug #1098349 reported by Phil Sharfstein on 2013-01-10
This bug affects 1 person
Affects Status Importance Assigned to Milestone

Bug Description

In screen.d/ldm if the ltsp client address begins with the ltsp server address, the grep check on line 92 of screen.d/ldm will return 0 and the "server" entry will not be added to /etc/hosts.

For example:
server IP =
Client IP =

Since is already in /etc/hosts the grep command will find a match.

92 if ! grep -q "$SRV" /etc/hosts ; then
93 echo "$SRV server-$SRV" >> /etc/hosts
94 fi

To fix this, change the grep command to:
92 if ! fgrep -qw "$SRV" /etc/hosts ; then

* fgrep ensures that no accidental pattern matching occurs on the '.' characters in the IP address
* -w only matches whole words (begins with whitespace or at the start of a line, ends with whitespace or at end of line)

Wim Muskee (wimmuskee) wrote :

Committed your fix: http://bazaar.launchpad.net/~ltsp-upstream/ltsp/ldm-trunk/revision/1459. Since fgrep is deprecated used the -F option.

Thanks for the report.

Changed in ltsp:
status: New → Fix Committed
Alkis Georgopoulos (alkisg) wrote :

Fix released in LTSP 5.4.5.

Changed in ltsp:
status: Fix Committed → Fix Released
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