prefetch-dependencies: Make the task fail if the input is empty

This change aims to make it clear that a successful execution of the
prefetch-dependencies task means that Cachi2 was executed successfully,
as opposed to the task being executed as a no-op.

Accepting an empty input was initially allowed because, previously, the
task execution was tied to hermetic builds, and we wanted to allow use
cases in which there could be a hermetic build but no prefetch. Since
this behavior is now changed, allowing the task to be a no-op is no
longer necessary.

Signed-off-by: Bruno Pimentel <[email protected]>

task/prefetch-dependencies-oci-ta/0.1/prefetch-dependencies-oci-ta.yaml

@@ -80,13 +80,6 @@ spec:
         mountPath: /mnt/trusted-ca
         readOnly: true
     script: |
-      if [ -z "${INPUT}" ]
-      then
-        # Confirm input was provided though it's likely the whole task would be skipped if it wasn't
-        echo "No prefetch will be performed because no input was provided for cachi2 fetch-deps"
-        exit 0
-      fi
-
       if [ "$DEV_PACKAGE_MANAGERS" = "true" ]; then
         dev_pacman_flag=--dev-package-managers
       else

task/prefetch-dependencies/0.1/prefetch-dependencies.yaml

@@ -51,13 +51,6 @@ spec:
         mountPath: /mnt/trusted-ca
         readOnly: true
     script: |
-      if [ -z "${INPUT}" ]
-      then
-        # Confirm input was provided though it's likely the whole task would be skipped if it wasn't
-        echo "No prefetch will be performed because no input was provided for cachi2 fetch-deps"
-        exit 0
-      fi
-
       if [ "$DEV_PACKAGE_MANAGERS" = "true" ]; then
         dev_pacman_flag=--dev-package-managers
       else