In the mysql/mariadb templates, set MYSQL_UNIX_PORT to a hardcoded short path (#2523)

..rather than plugin's project-relative path, to avoid triggering 'The
socket file path is too long (> 107)' error on start. Also specify the
(blank) password in 'test_db_setup'. Fixes #2521

## How was it tested?

Per the description in #2521, after this change `mysqld` should come up
in a >107 length path, e.g.:
```
cd ~/src/github.com/jetify-com/devbox/examples/databases/mysql
devbox services up -b
tail -1 .devbox/compose.log  # This shows the socket path, which should now be /tmp/devbox/mariadb/run/mysql.sock
devbox run mysql -u root -p   # Blank password - connects
```

Note: I have patched mysql and mariadb because they are essentially the
same. However whereas `mysql` respects the `MYSQL_UNIX_PORT` env
variable, `mysql` from the mariadb package does not (logged as #2522),
so the last step of this code fails:
```
cd ~/src/github.com/jetify-com/devbox/examples/databases/mariadb
devbox services up -b
tail -1 .devbox/compose.log  # This shows the socket path, which should now be /tmp/devbox/mariadb/run/mysql.sock
devbox run mysql -u root -p   # ERROR 2002 (HY000): Can't connect to local server through socket '/run/mysqld/mysqld.sock' (2)
```
Aside from testing, this mariadb bug is irrelevant to this patch. I just
thought I'd mention it.

---------

Signed-off-by: dependabot[bot] <support@github.com>
Signed-off-by: John Lago <750845+Lagoja@users.noreply.github.com>
Co-authored-by: Artem Klevtsov <a.a.klevtsov@gmail.com>
Co-authored-by: Greg Curtis <greg.curtis@jetify.com>
Co-authored-by: Daniel Loreto <279789+loreto@users.noreply.github.com>
Co-authored-by: Mike Landau <mikeland86@gmail.com>
Co-authored-by: John Lago <750845+Lagoja@users.noreply.github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Will Brennan <will@moondev.co.uk>

Author: 8 people

examples/databases/mariadb/README.md

@@ -3,7 +3,7 @@
 ## mariadb Notes
 
 1. Start the mariadb server using `devbox services up`
-1. Create a database using `"mysql -u root < setup_db.sql"`
+1. Create a database using `"mysql --socket-path=$MYSQL_UNIX_PORT --password='' < setup_db.sql"`
 1. You can now connect to the database from the command line by running `devbox run connect_db`
 
 ## Services
@@ -22,10 +22,4 @@ Use `devbox services start|stop [service]` to interact with services
 
 To show this information, run `devbox info mariadb`
 
-Note that the `.sock` filepath can only be maximum 100 characters long. You can point to a different path by setting the `MYSQL_UNIX_PORT` env variable in your `devbox.json` as follows:
-
-```
-"env": {
-    "MYSQL_UNIX_PORT": "/<some-other-path>/mysql.sock"
-}
-```
+Note that the `.sock` filepath can only be maximum 100 characters long. You can point to a different path by setting the `MYSQL_UNIX_PORT` env variable in your `devbox.json`.

examples/databases/mariadb/devbox.json

@@ -10,15 +10,17 @@
       ],
       "test_db_setup": [
         "mkdir -p /tmp/devbox/mariadb/run",
-        "export MYSQL_UNIX_PORT=/tmp/devbox/mariadb/run/mysql.sock",
         "devbox services up -b",
         "sleep 5",
-        "mysql -u root < setup_db.sql",
+        "mysql -u root --password='' < setup_db.sql",
         "devbox services stop"
       ]
     }
   },
   "nixpkgs": {
     "commit": "f80ac848e3d6f0c12c52758c0f25c10c97ca3b62"
-  }
+  },
+  "env": {
+    "MYSQL_UNIX_PORT": "/tmp/devbox/mariadb/run/mysql.sock"
+   }
 }

examples/databases/mysql/README.md

@@ -3,7 +3,7 @@
 ## mysql Notes
 
 1. Start the mysql server using `devbox services up`
-1. Create a database using `"mysql -u root < setup_db.sql"`
+1. Create a database using `"mysql -u root --password='' < setup_db.sql"`
 1. You can now connect to the database from the command line by running `devbox run connect_db`
 
 ## Services
@@ -22,10 +22,4 @@ Use `devbox services start|stop [service]` to interact with services
 
 To show this information, run `devbox info mysql`
 
-Note that the `.sock` filepath can only be maximum 100 characters long. You can point to a different path by setting the `MYSQL_UNIX_PORT` env variable in your `devbox.json` as follows:
-
-```json
-"env": {
-    "MYSQL_UNIX_PORT": "/<some-other-path>/mysql.sock"
-}
-```
+Note that the `.sock` filepath can only be maximum 100 characters long. You can point to a different path by setting the `MYSQL_UNIX_PORT` env variable in your `devbox.json`.

examples/databases/mysql/devbox.json

@@ -10,12 +10,14 @@
       ],
       "test_db_setup": [
         "mkdir -p /tmp/devbox/mariadb/run",
-        "export MYSQL_UNIX_PORT=/tmp/devbox/mariadb/run/mysql.sock",
         "devbox services up -b",
         "sleep 5",
-        "mysql -u root < setup_db.sql",
+        "mysql -u root --password='' < setup_db.sql",
         "devbox services stop"
       ]
     }
-  }
+  },
+  "env": {
+    "MYSQL_UNIX_PORT": "/tmp/devbox/mariadb/run/mysql.sock"
+   }
 }