[Bug 2083529] [NEW] networkd-dispatcher: scripts not executed for renamed interfaces

[James Dingwall]

Public bug reported:

With the advent of predictable device naming in systemd then during
system boot interfaces get renamed, e.g. eth0->eno1, eth1->eno6np1 etc.
If a networkd-dispatcher script is testing for a specific renamed
device, e.g. eno6np1, it does not execute.  If in each of the
/etc/networkd-dispatcher/... directories we create a log message with
this script:

```
#!/bin/bash

set -eu

STAGE="$(basename "$(dirname "${BASH_SOURCE[0]}")")"

MESSAGE="${STAGE}: ${IFACE} - IP_ADDRS='${IP_ADDRS:-}'
IP6_ADDRS='${IP6_ADDRS:-}'"

/usr/bin/logger -t "[NET-DIS]" -p "local1.INFO" "${MESSAGE}"
```

Then checking syslog gives us:

```
Oct  2 13:47:59 router-00 [NET-DIS]: carrier.d: lo - IP_ADDRS='' IP6_ADDRS='::1'
Oct  2 13:47:59 router-00 [NET-DIS]: off.d: eth0 - IP_ADDRS='' IP6_ADDRS=''
Oct  2 13:47:59 router-00 [NET-DIS]: off.d: eth1 - IP_ADDRS='' IP6_ADDRS=''
Oct  2 13:48:00 router-00 [NET-DIS]: off.d: eth2 - IP_ADDRS='' IP6_ADDRS=''
Oct  2 13:48:00 router-00 [NET-DIS]: off.d: eth3 - IP_ADDRS='' IP6_ADDRS=''
Oct  2 13:48:00 router-00 [NET-DIS]: off.d: eth4 - IP_ADDRS='' IP6_ADDRS=''
Oct  2 13:48:01 router-00 [NET-DIS]: off.d: eth5 - IP_ADDRS='' IP6_ADDRS=''
Oct  2 13:48:01 router-00 [NET-DIS]: off.d: eth6 - IP_ADDRS='' IP6_ADDRS=''
Oct  2 13:48:01 router-00 [NET-DIS]: off.d: eth7 - IP_ADDRS='' IP6_ADDRS=''
Oct  2 13:48:10 router-00 [NET-DIS]: no-carrier.d: drbd - IP_ADDRS='' IP6_ADDRS=''
Oct  2 13:49:59 router-00 [NET-DIS]: configuring.d: eth0 - IP_ADDRS='' IP6_ADDRS=''
Oct  2 13:49:59 router-00 [NET-DIS]: carrier.d: eth0 - IP_ADDRS='' IP6_ADDRS=''
Oct  2 13:49:59 router-00 [NET-DIS]: routable.d: eth0 - IP_ADDRS='' IP6_ADDRS=''
Oct  2 13:50:01 router-00 [NET-DIS]: configured.d: eth0 - IP_ADDRS='' IP6_ADDRS=''
```

There are never any executions using the new name after the interface is
renamed.  The expected behaviour is that networkd-dispatcher runs the
scripts again for the predictable name.


# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 22.04.4 LTS
Release:        22.04
Codename:       jammy


# apt-cache policy networkd-dispatcher
networkd-dispatcher:
  Installed: 2.1-2ubuntu0.22.04.2
  Candidate: 2.1-2ubuntu0.22.04.2

** Affects: networkd-dispatcher (Ubuntu)
     Importance: Undecided
         Status: New

** Bug watch added: gitlab.com/craftyguy/networkd-dispatcher/-/issues #68
   https://gitlab.com/craftyguy/networkd-dispatcher/-/issues/68

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https://bugs.launchpad.net/bugs/2083529

Title:
  networkd-dispatcher: scripts not executed for renamed interfaces

Status in networkd-dispatcher package in Ubuntu:
  New

Bug description:
  With the advent of predictable device naming in systemd then during
  system boot interfaces get renamed, e.g. eth0->eno1, eth1->eno6np1
  etc.  If a networkd-dispatcher script is testing for a specific
  renamed device, e.g. eno6np1, it does not execute.  If in each of the
  /etc/networkd-dispatcher/... directories we create a log message with
  this script:

  ```
  #!/bin/bash

  set -eu

  STAGE="$(basename "$(dirname "${BASH_SOURCE[0]}")")"

  MESSAGE="${STAGE}: ${IFACE} - IP_ADDRS='${IP_ADDRS:-}'
  IP6_ADDRS='${IP6_ADDRS:-}'"

  /usr/bin/logger -t "[NET-DIS]" -p "local1.INFO" "${MESSAGE}"
  ```

  Then checking syslog gives us:

  ```
  Oct  2 13:47:59 router-00 [NET-DIS]: carrier.d: lo - IP_ADDRS='' IP6_ADDRS='::1'
  Oct  2 13:47:59 router-00 [NET-DIS]: off.d: eth0 - IP_ADDRS='' IP6_ADDRS=''
  Oct  2 13:47:59 router-00 [NET-DIS]: off.d: eth1 - IP_ADDRS='' IP6_ADDRS=''
  Oct  2 13:48:00 router-00 [NET-DIS]: off.d: eth2 - IP_ADDRS='' IP6_ADDRS=''
  Oct  2 13:48:00 router-00 [NET-DIS]: off.d: eth3 - IP_ADDRS='' IP6_ADDRS=''
  Oct  2 13:48:00 router-00 [NET-DIS]: off.d: eth4 - IP_ADDRS='' IP6_ADDRS=''
  Oct  2 13:48:01 router-00 [NET-DIS]: off.d: eth5 - IP_ADDRS='' IP6_ADDRS=''
  Oct  2 13:48:01 router-00 [NET-DIS]: off.d: eth6 - IP_ADDRS='' IP6_ADDRS=''
  Oct  2 13:48:01 router-00 [NET-DIS]: off.d: eth7 - IP_ADDRS='' IP6_ADDRS=''
  Oct  2 13:48:10 router-00 [NET-DIS]: no-carrier.d: drbd - IP_ADDRS='' IP6_ADDRS=''
  Oct  2 13:49:59 router-00 [NET-DIS]: configuring.d: eth0 - IP_ADDRS='' IP6_ADDRS=''
  Oct  2 13:49:59 router-00 [NET-DIS]: carrier.d: eth0 - IP_ADDRS='' IP6_ADDRS=''
  Oct  2 13:49:59 router-00 [NET-DIS]: routable.d: eth0 - IP_ADDRS='' IP6_ADDRS=''
  Oct  2 13:50:01 router-00 [NET-DIS]: configured.d: eth0 - IP_ADDRS='' IP6_ADDRS=''
  ```

  There are never any executions using the new name after the interface
  is renamed.  The expected behaviour is that networkd-dispatcher runs
  the scripts again for the predictable name.

  
  # lsb_release -a
  No LSB modules are available.
  Distributor ID: Ubuntu
  Description:    Ubuntu 22.04.4 LTS
  Release:        22.04
  Codename:       jammy

  
  # apt-cache policy networkd-dispatcher
  networkd-dispatcher:
    Installed: 2.1-2ubuntu0.22.04.2
    Candidate: 2.1-2ubuntu0.22.04.2

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