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ansible: build-host: configure email sending

Configure the hosts to forward e-mails addressed to "root", so we get
mdmonitor reports about failing raid devices.

Related: OS#7068
Change-Id: I22ea83de3417cbbb578345d34f18095c47441610
---
A ansible/roles/configure-email-sending/handlers/main.yml
A ansible/roles/configure-email-sending/tasks/main.yml
M ansible/setup-build-host.yml
3 files changed, 37 insertions(+), 0 deletions(-)

diff --git a/ansible/roles/configure-email-sending/handlers/main.yml b/ansible/roles/configure-email-sending/handlers/main.yml
new file mode 100644
index 0000000..cdbfca4
--- /dev/null
+++ b/ansible/roles/configure-email-sending/handlers/main.yml
@@ -0,0 +1,9 @@
+---
+- name: run newaliases
+  ansible.builtin.command:
+    cmd: newaliases
+
+- name: restart exim4
+  ansible.builtin.service:
+    name: exim4
+    state: restarted
diff --git a/ansible/roles/configure-email-sending/tasks/main.yml b/ansible/roles/configure-email-sending/tasks/main.yml
new file mode 100644
index 0000000..065c883
--- /dev/null
+++ b/ansible/roles/configure-email-sending/tasks/main.yml
@@ -0,0 +1,27 @@
+---
+- name: Set /etc/mailname
+  ansible.builtin.lineinfile:
+    path: /etc/mailname
+    regexp: '.*'
+    line: "{{ inventory_hostname }}"  # e.g. build4.osmocom.org
+
+- name: Set mail alias for root
+  ansible.builtin.lineinfile:
+    path: /etc/aliases
+    regexp: '^root:'
+    line: "root: root@osmocom.org"
+  notify: run newaliases
+
+- name: Configure exim4 dc_smarthost
+  ansible.builtin.lineinfile:
+    path: /etc/exim4/update-exim4.conf.conf
+    regexp: '^dc_smarthost='
+    line: "dc_smarthost='mail.osmocom.org'"
+  notify: restart exim4
+
+- name: Configure exim4 dc_eximconfig_configtype
+  ansible.builtin.lineinfile:
+    path: /etc/exim4/update-exim4.conf.conf
+    regexp: '^dc_eximconfig_configtype='
+    line: "dc_eximconfig_configtype='smarthost'"
+  notify: restart exim4
diff --git a/ansible/setup-build-host.yml b/ansible/setup-build-host.yml
index ed8def5..8107a01 100644
--- a/ansible/setup-build-host.yml
+++ b/ansible/setup-build-host.yml
@@ -18,3 +18,4 @@
         update_cache: yes
   roles:
     - name: apt-allow-relinfo-change
+    - name: configure-email-sending

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