** Description changed:
- When checking isc-dhcp-server unit file I saw isc-dhcp-server is being
- started by:
+ [Impact]
+
+ When checking isc-dhcp-server unit file it was seen that isc-dhcp-server
+ is being started by:
ConditionPathExists=/etc/default/isc-dhcp-server
ConditionPathExists=|/etc/ltsp/dhcpd.conf
ConditionPathExists=|/etc/dhcp/dhcpd.conf
[Service]
EnvironmentFile=/etc/default/isc-dhcp-server
RuntimeDirectory=dhcp-server
# The leases files need to be root:dhcpd even when dropping privileges
ExecStart=/bin/sh -ec '\
CONFIG_FILE=/etc/dhcp/dhcpd.conf; \
if [ -f /etc/ltsp/dhcpd.conf ]; then CONFIG_FILE=/etc/ltsp/dhcpd.conf;
fi; \
[ -e /var/lib/dhcp/dhcpd.leases ] || touch /var/lib/dhcp/dhcpd.leases; \
chown root:dhcpd /var/lib/dhcp /var/lib/dhcp/dhcpd.leases; \
chmod 775 /var/lib/dhcp ; chmod 664 /var/lib/dhcp/dhcpd.leases; \
exec dhcpd -user dhcpd -group dhcpd -f -4 -pf /run/dhcp-server/dhcpd.pid
-cf $CONFIG_FILE $INTERFACES'
But the /etc/default/isc-dhcp-server file sets $INTERFACESv4 and
$INTERFACESv6.
- This has only been working because cmdline sets -4 and subnet
- declaration in dhcpd.conf file makes dhcp-server to bind to the correct
- interfaces, as it looks like.
+ The previous upload(er) forgot to mention (and split) the INTERFACES
+ variable to v4 and v6 and as a result, it has been this way for so long.
+
+ The SRU would split the variables into respective names, thereby making
+ sure that what /etc/default/isc-dhcp-serve sets, is available in the
+ respective service file.
+
+
+ [Test Plan]
+
+ To reproduce, simply install isc-dhcp-server via apt.
+ Now, if you see the /etc/default/isc-dhcp-server file, it sets 2 variables,
namely, INTERFACESv4 and INTERFACESv6. However, if you check the respective
services file, that is, /lib/systemd/system/isc-dhcp-server.service and
/lib/systemd/system/isc-dhcp-server6.service, it is still using the INTERFACES
variable.
+
+ After the SRU is performed, the respective services files should use
+ INTERFACESv4 and INTERFACESv6 variable, instead of just INTERFACES.
+
+ To ensure smooth upgrade of this package, we'd check if the user hasn't
+ manually set a INTERFACESv{4,6} variable to workaround this bug. If they
+ have, then we simply check and make sure, we use the correct variable.
+
+
+ [Where problems could occur]
+
+ The problem could occur if the user has manually set some different
+ workaround this bug and so the usual upgrade could break some of their
+ old configuration.
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https://bugs.launchpad.net/bugs/1894172
Title:
isc-dhcp-server using wrong env variable for INTERFACES
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