A minimal example of DVC not using the cache

test_case.sh

#!/bin/bash

set -ex

rm -rf test_example
mkdir test_example
cd test_example

echo "Setup DVC"
dvc init --no-scm

echo "Add our basic input file"
echo "v1" > input
dvc add input

echo "Now setup a basic pipeline, just copy the file"
dvc run -d input -o output cp input output

echo "dvc status shows all good and up to date"
dvc status

echo "Now let's update the input"
echo "v2" > input

echo "Check DVC knows to update"
dvc status

echo "Recalculate our output"
dvc repro output.dvc
cat output

echo "Now go back to the original file contents"
echo "v1" > input

echo "Identifies something that needs rerunning"
dvc status

echo "This I want to *not* rerun, but use the cached data"
dvc repro output.dvc
cat output

cd ../