[shellprocess] Introduce configuration for verbosity

src/modules/shellprocess/shellprocess.conf

@@ -84,8 +84,20 @@
 ---
 # Set to true to run in host, rather than target system
 dontChroot: false
-# Tune this for the commands you're actually running
-# timeout: 10
+
+# Tune this for the commands you're actually running, or
+# use the list-of-items form of commands to tune the timeout
+# for each command individually.
+timeout: 10
+
+# This will copy the output from the command into the Calamares
+# log file. No processing is done beyond log-each-line-separately,
+# so this can introduce weirdness in the log if the script
+# outputs e.g. escape codes.
+#
+# The default is `false`. This can also be set for each
+# command individually.
+verbose: false
 
 # Script may be a single string (because false returns an error exit
 # code, this will trigger a failure in the installation):
@@ -109,6 +121,8 @@ script:
     - "/usr/bin/true"
     - command: "/usr/local/bin/slowloris"
       timeout: 3600
+    - command: "echo -e '\e[33;2mred\e[33;0m'"
+      verbose: true
 
 # You can change the description of the job (as it is displayed in the
 # progress bar during installation) by defining an *i18n* key, which

src/modules/shellprocess/shellprocess.schema.yaml

@@ -19,7 +19,10 @@ definitions:
       timeout:
         type: number
         description: the (optional) timeout for this specific command (differently
-          from the global setting)
+          from the global setting).
+      verbose:
+        type: boolean
+        description: when true, log output from the command to the Calamares log.
     required:
     - command
 type: object
@@ -34,6 +37,9 @@ properties:
     type: number
     description: The (global) timeout for the command list in seconds. If unset, defaults
       to 30 seconds.
+  verbose:
+    type: boolean
+    description: when true, log output from the command to the Calamares log.
   script:
     anyOf:
     - $ref: '#definitions/command'
@@ -55,3 +61,5 @@ properties:
         type: string
     required:
     - name
+required:
+  - script