Give the mastodon user a /home/mastodon home

The mastodon user's home was /opt/mastodon, i.e. the clone destination, so writing the SSH deploy key into ~/.ssh made the directory non-empty and Chef's git resource silently skipped cloning (it only clones into an empty directory). Use a dedicated /home/mastodon home for the user and keep the clone destination separate. Also clear a non-git (partial) clone destination before cloning.

site-cookbooks/kosmos-mastodon/recipes/build.rb

@@ -13,6 +13,7 @@ postgresql_credentials = data_bag_item('credentials', 'postgresql')
 
 mastodon_path = node["kosmos-mastodon"]["directory"]
 mastodon_user = "mastodon"
+mastodon_home = "/home/#{mastodon_user}"
 
 ruby_version = node["kosmos-mastodon"]["ruby_version"]
 ruby_path = "/opt/ruby_build/builds/#{ruby_version}"
@@ -32,7 +33,7 @@ rails_env = node.chef_environment == "development" ? "development" : "production
 deploy_env = {
   # FIXME: /usr/bin was missing from PATH when running `yarn install`
   "PATH" => "#{ruby_path}/bin:/usr/bin:$PATH",
-  "HOME" => mastodon_path,
+  "HOME" => mastodon_home,
   "RAILS_ENV" => rails_env,
   "NODE_ENV" => rails_env,
   "COREPACK_ENABLE_DOWNLOAD_PROMPT" => "0"
@@ -44,14 +45,15 @@ build_uptodate = "test -f #{mastodon_path}/tmp/built-revision && " \
 
 credentials = data_bag_item('credentials', 'mastodon')
 
-# The repository is private; clone it with a read-only SSH deploy key.
-directory "#{mastodon_path}/.ssh" do
+# The repository is private; clone it with a read-only SSH deploy key kept in
+# the mastodon user's home (outside the clone destination).
+directory "#{mastodon_home}/.ssh" do
   owner mastodon_user
   group mastodon_user
   mode  "0700"
 end
 
-file "#{mastodon_path}/.ssh/id_ed25519" do
+file "#{mastodon_home}/.ssh/id_ed25519" do
   # OpenSSH's PEM parser rejects a private key without a trailing newline
   content lazy { credentials["repo_deploy_key"].to_s.chomp + "\n" }
   owner mastodon_user
@@ -60,26 +62,33 @@ file "#{mastodon_path}/.ssh/id_ed25519" do
   sensitive true
 end
 
-file "#{mastodon_path}/.ssh/known_hosts" do
+file "#{mastodon_home}/.ssh/known_hosts" do
   content "#{node['kosmos-mastodon']['gitea_ssh_host_key']}\n"
   owner mastodon_user
   group mastodon_user
   mode  "0644"
 end
 
-file "#{mastodon_path}/.ssh/config" do
+file "#{mastodon_home}/.ssh/config" do
   content <<-EOF
 Host gitea.kosmos.org
-  IdentityFile #{mastodon_path}/.ssh/id_ed25519
+  IdentityFile #{mastodon_home}/.ssh/id_ed25519
   IdentitiesOnly yes
   StrictHostKeyChecking yes
-  UserKnownHostsFile #{mastodon_path}/.ssh/known_hosts
+  UserKnownHostsFile #{mastodon_home}/.ssh/known_hosts
   EOF
   owner mastodon_user
   group mastodon_user
   mode  "0600"
 end
 
+# Chef's git resource silently skips cloning when the destination is non-empty
+# and not a git clone, so make sure we start from a clean directory.
+execute "clear non-git repository directory" do
+  command "find #{mastodon_path} -mindepth 1 -delete"
+  only_if { ::Dir.exist?(mastodon_path) && !::File.exist?("#{mastodon_path}/.git") }
+end
+
 git mastodon_path do
   user mastodon_user
   group mastodon_user
@@ -87,8 +96,8 @@ git mastodon_path do
   repository node["kosmos-mastodon"]["repo"]
   revision   node["kosmos-mastodon"]["revision"]
   environment "GIT_SSH_COMMAND" =>
-    "ssh -i #{mastodon_path}/.ssh/id_ed25519 -o IdentitiesOnly=yes " \
-    "-o StrictHostKeyChecking=yes -o UserKnownHostsFile=#{mastodon_path}/.ssh/known_hosts"
+    "ssh -i #{mastodon_home}/.ssh/id_ed25519 -o IdentitiesOnly=yes " \
+    "-o StrictHostKeyChecking=yes -o UserKnownHostsFile=#{mastodon_home}/.ssh/known_hosts"
 end
 
 ldap_config = {

site-cookbooks/kosmos-mastodon/recipes/dependencies.rb

@@ -49,6 +49,7 @@ elasticsearch_service 'elasticsearch'
 
 mastodon_path = node["kosmos-mastodon"]["directory"]
 mastodon_user = "mastodon"
+mastodon_home = "/home/#{mastodon_user}"
 
 group mastodon_user do
   gid 62786
@@ -59,7 +60,13 @@ user mastodon_user do
   uid 62786
   gid 62786
   shell "/bin/bash"
-  home mastodon_path
+  home mastodon_home
+end
+
+directory mastodon_home do
+  owner mastodon_user
+  group mastodon_user
+  mode  "0755"
 end
 
 directory mastodon_path do

site-cookbooks/kosmos-mastodon/recipes/deploy.rb

@@ -24,7 +24,7 @@ rails_env = node.chef_environment == "development" ? "development" : "production
 deploy_env = {
   # FIXME: /usr/bin was missing from PATH when running `yarn install`
   "PATH" => "#{ruby_path}/bin:/usr/bin:$PATH",
-  "HOME" => mastodon_path,
+  "HOME" => "/home/#{mastodon_user}",
   "RAILS_ENV" => rails_env,
   "NODE_ENV" => rails_env,
   "COREPACK_ENABLE_DOWNLOAD_PROMPT" => "0"