[Bug 1832053] Re: systemd dhclient hook is causing md5sum cmds in inexistent files

[Rafael David Tinoco]

*** This bug is a duplicate of bug 1832050 ***
    https://bugs.launchpad.net/bugs/1832050

** Also affects: systemd (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: chrony (Ubuntu)
   Importance: Undecided
       Status: New

** No longer affects: Ubuntu Eoan

** Changed in: chrony (Ubuntu Eoan)
       Status: New => In Progress

** Changed in: systemd (Ubuntu Eoan)
       Status: New => In Progress

** This bug has been marked a duplicate of bug 1832050
   chrony autopkgtest "time-sources-from-dhcp-servers" fails (produces stderr)

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to systemd in Ubuntu.
https://bugs.launchpad.net/bugs/1832053

Title:
  systemd dhclient hook is causing md5sum cmds in inexistent files

Status in Ubuntu:
  Confirmed
Status in chrony package in Ubuntu:
  In Progress
Status in systemd package in Ubuntu:
  In Progress
Status in chrony source package in Eoan:
  In Progress
Status in systemd source package in Eoan:
  In Progress

Bug description:
  I have discovered this issue by doing investigation for the BUG:

  https://bugs.launchpad.net/ubuntu/+bug/1832050

  """
  I have reproduced the issue by hand doing:

  $ apt-get install isc-dhcp-server
  $ modprobe dummy

  $ ip link add name dummy0 type dummy
  $ ip address add 192.168.1.1/24 dev dummy0
  $ ip link set dev dummy0 up

  cat <<EOF > /etc/dhcp/dhcpd.conf
  default-lease-time 600;
  max-lease-time 7200;
  authorative;

  subnet 192.168.1.0 netmask 255.255.255.0 {
      option subnet-mask 255.255.255.0;
      option broadcast-address 192.168.1.255;
      option ntp-servers 192.168.1.50;
      range 192.168.1.42 192.168.1.100;
  }
  EOF

  $ sed -i 's/INTERFACESv4=""/INTERFACESv4="dummy0"/' /etc/default/isc-
  dhcp-server

  and

  $ systemctl restart isc-dhcp-server

  $ dhclient dummy0 <- problem happens here
  """

  When trying a simple dhclient running on a bridge called "teste":

  (c)inaddy at eoanchrony:~/work/sources/ubuntu/chrony/debian/tests$ sudo dhclient teste
  md5sum: /run/systemd/resolved.conf.d/isc-dhcp-v4-teste.conf: No such file or directory
  md5sum: /run/systemd/resolved.conf.d/isc-dhcp-v6-teste.conf: No such file or directory
  md5sum: /run/systemd/resolved.conf.d/isc-dhcp-v4-teste.conf: No such file or directory
  md5sum: /run/systemd/resolved.conf.d/isc-dhcp-v6-teste.conf: No such file or directory

  The problem is caused by the hook script:

  /etc/dhcp/dhclient-enter-hooks.d/resolved

  In the following line:

  md5sum $statedir/isc-dhcp-v4-$interface.conf $statedir/isc-
  dhcp-v6-$interface.conf &> $oldstate

  I believe commit

  +systemd (240-6ubuntu9) eoan; urgency=medium

  caused this issue with a patch to file "debian/extra/dhclient-enter-
  resolved-hook"

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+bug/1832053/+subscriptions