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# This is a sample Makeflow script that retrieves an image from the web,
# creates four variations of it, and then combines them into an animation
{
# Makeflow will set $CONVERT and $CURL in the environment when executing the tasks.
# We repeat the variables here so there's only one place to change the paths.
# In the rules, we can run $CONVERT rather than hardcoding paths.
"environment": {
"CONVERT": CONVERT,
"CURL": CURL
},
# This is the meat of the Makeflow, the actual production rules
"rules": [
# Once the files are generated, this rule combines them into the final output.
{
"command": "$CONVERT -delay 10 -loop 0 capitol.jpg capitol.90.jpg capitol.180.jpg capitol.270.jpg capitol.360.jpg capitol.270.jpg capitol.180.jpg capitol.90.jpg capitol.montage.gif",
"outputs": ["capitol.montage.gif"],
"inputs": [
CONVERT,
"capitol.jpg",
format("capitol.%d.jpg", i) for i in ANGLES,
],
},
# This rule downloads the input data.
{
# We could have let the shell substitute $CURL rather than concatenating
# the strings ourselves. Also note that we need to escape the double quotes
# around $URL so that it's properly quoted in the shell.
"command": CURL + " -o capitol.jpg \"$URL\"",
"outputs": ["capitol.jpg"],
# Makeflow requires programs to be specified as inputs as well.
"inputs": [CURL],
# Environment variables here apply only to the current rule.
"environment": {
"URL": "http://ccl.cse.nd.edu/images/capitol.jpg"
},
# If a rule is specified with local_job, it executes at the local site
"local_job": true
}, {
# The current angle will be bound to `i`, so we can concatenate
# to build the command line and output.
"command": format("$CONVERT -swirl %d capitol.jpg capitol.%d.jpg", i, i),
"outputs": [format("capitol.%d.jpg", i)],
"inputs": [CONVERT, "capitol.jpg"]
} for i in ANGLES,
# the list comprehension here will repeat the previous expression for each angle
]
}
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