Merge pull request EESSI#37 from EESSI/host_symlinks

Add Ansible task for making symlinks to host files/directories

Author: peterstol

.github/workflows/ansible-lint.yml

@@ -27,9 +27,9 @@ jobs:
         # [optional]
         # Arguments to override a package and its version to be set explicitly.
         # Must follow the example syntax.
-        override-deps: |
-          ansible==2.9
-          ansible-lint==4.2.0
+        #override-deps: |
+        #  ansible==2.9
+        #  ansible-lint==4.2.0
         # [optional]
         # Arguments to be passed to the ansible-lint
 

ansible/playbooks/README.md

@@ -3,7 +3,7 @@
 
 # Ansible role/playbooks for installing the compatibility layer
 
-This directory contains an Ansible role (`compatibility-layer`) in the subdirectory `roles` which has
+This directory contains an Ansible role (`compatibility_layer`) in the subdirectory `roles` which has
 all functionality for installing the compatibility layer into an existing Gentoo Prefix installation.
 It adds a given overlay to the installation and installs a list of package sets and list of additional packages.
 The playbook `install.yml` will execute this role on a given server. 

ansible/playbooks/install.yml

@@ -8,5 +8,5 @@
     BPREFIX: "{{ gentoo_prefix_path }}"
     LC_ALL: C
   roles:
-    - compatibility-layer
+    - compatibility_layer
   become: True

ansible/playbooks/roles/compatibility-layer/defaults/main.yml

@@ -0,0 +1,53 @@
+# Defaults file for the compatibility layer role.
+---
+custom_overlay_name: eessi
+custom_overlay_source: git
+custom_overlay_url: https://github.com/EESSI/gentoo-overlay.git
+
+cvmfs_start_transaction: False
+cvmfs_publish_transaction: False
+cvmfs_abort_transaction_on_failures: False
+cvmfs_repository: pilot.eessi-hpc.org
+
+gentoo_prefix_path: /cvmfs/pilot.eessi-hpc.org/2020.09/compat/x86_64
+
+package_sets: 
+  - 2020.08
+
+prefix_packages:
+
+# List of locations that should get a symlink $EPREFIX/$LOCATION -> $LOCATION.
+# This ensures that things like user/group ids are correct/looked up in the right way in the Prefix environment.
+symlinks_to_host:
+  # required to ensure local user groups are known
+  - /etc/group 
+
+  # required to ensure local users are known (see https://github.com/EESSI/compatibility-layer/issues/15)
+  - /etc/passwd 
+
+  # required to ensure name-service information is taken from the right source (e.g. ldap)
+  - /etc/nsswitch.conf
+
+  # required to use the DNS resolver from the host (should be done automatically)
+  - /etc/resolv.conf
+
+  # required if Centrify is used in nsswitch.conf
+  - /lib64/libnss_centrifydc.so.2
+
+  # required if LDAP is used in nsswitch.conf
+  - /lib64/libnss_ldap.so.2
+
+  # required if SSSD is used in nsswitch.conf
+  - /lib64/libnss_sss.so.2
+
+#  - /etc/hosts
+#  - /var/lib/munge
+#  - /var/lib/unbound
+#  - /var/lib/VirtualGL
+#  - /var/log/munge
+#  - /var/log/wtmp
+#  - /var/run
+#  - /var/spool
+#  - /var/tmp
+#  - /run/dbus
+#  - /tmp

ansible/playbooks/roles/compatibility_layer/defaults/main.yml

@@ -0,0 +1,26 @@
+# Replace a list of files/directories in Gentoo Prefix installation by symlinks to corresponding files/directories
+# on the host in order to solve some common issues.
+---
+
+- name: Check type of original files/directories
+  stat:
+    path: "{{ gentoo_prefix_path }}{{ item }}"
+  with_items: "{{ symlinks_to_host }}"
+  register: orig_types
+
+- name: Remove original files/directories
+  file:
+    path: "{{ gentoo_prefix_path }}{{ item.item }}"
+    state: absent
+  with_items: "{{ orig_types.results }}"
+  when:
+    - item.stat.exists
+    - not item.stat.islnk
+
+- name: Make symlinks
+  file:
+    src: "{{ item }}"
+    dest: "{{ gentoo_prefix_path }}{{ item }}"
+    state: link
+    force: yes
+  with_items: "{{ symlinks_to_host }}"

ansible/playbooks/roles/compatibility-layer/tasks/add_overlay.yml renamed to ansible/playbooks/roles/compatibility_layer/tasks/add_overlay.yml

@@ -21,6 +21,8 @@
   when: cvmfs_start_transaction
 
 - block:
+  - include_tasks: create_host_symlinks.yml
+
   - include_tasks: add_overlay.yml
 
   - include_tasks: install_packages.yml