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zcashd
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Re-download parameters if they already exist but don't have correct sums 

We change the help text to allude to this behavior as well.
This commit is contained in:
sasha 2023-02-16 17:01:14 -08:00
parent 862c52c48b
commit a0869d6a35
1 changed files with 44 additions and 4 deletions
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48
zcutil/fetch-params.sh
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@ -163,6 +163,43 @@ EOF
unset -v expectedhash
}
check_and_fetch_params() {
# We only set these variables inside this function,
# and unset them at the end of the function.
filename="$1"
output="$2"
dlname="${output}.dl"
expectedhash="$3"
if ! [ -f "$output" ]
then
fetch_params "$filename" "$output" "$expectedhash"
else
# The file in question exists, so we verify its checksum.
# If it's not valid, we delete it and fetch it
set +e
"$SHA256CMD" $SHA256ARGS -c <<EOF
$expectedhash $output
EOF
# Check the exit code of the shasum command:
CHECKSUM_RESULT=$?
set -e
if [ $CHECKSUM_RESULT -eq 0 ]; then
echo "Parameter file ${filename} has a valid checksum, continuing."
else
echo "Parameter file ${filename} has a invalid checksum, deleting and re-downloading." >&2
rm "$output"
fetch_params "$filename" "$output" "$expectedhash"
fi
fi
unset -v filename
unset -v output
unset -v dlname
unset -v expectedhash
}
# Use flock to prevent parallel execution.
lock() {
if [ "$uname_S" = "Darwin" ]; then
@ -199,7 +236,10 @@ Zcash - ${SCRIPT_NAME}
This script will fetch the Zcash zkSNARK parameters and verify their
integrity with sha256sum.
If they already exist locally, it will exit now and do nothing else.
If the files are already present and have the correct sha256sum, no
networking is used. Parameter files with incorrect sha256sums are
deleted and re-downloaded.
EOF
# Now create PARAMS_DIR and insert a README if necessary:
@ -236,9 +276,9 @@ EOF
#fetch_params "$SPROUT_VKEY_NAME" "$PARAMS_DIR/$SPROUT_VKEY_NAME" "4bd498dae0aacfd8e98dc306338d017d9c08dd0918ead18172bd0aec2fc5df82"
# Sapling parameters:
fetch_params "$SAPLING_SPEND_NAME" "$PARAMS_DIR/$SAPLING_SPEND_NAME" "8e48ffd23abb3a5fd9c5589204f32d9c31285a04b78096ba40a79b75677efc13"
fetch_params "$SAPLING_OUTPUT_NAME" "$PARAMS_DIR/$SAPLING_OUTPUT_NAME" "2f0ebbcbb9bb0bcffe95a397e7eba89c29eb4dde6191c339db88570e3f3fb0e4"
fetch_params "$SAPLING_SPROUT_GROTH16_NAME" "$PARAMS_DIR/$SAPLING_SPROUT_GROTH16_NAME" "b685d700c60328498fbde589c8c7c484c722b788b265b72af448a5bf0ee55b50"
check_and_fetch_params "$SAPLING_SPEND_NAME" "$PARAMS_DIR/$SAPLING_SPEND_NAME" "8e48ffd23abb3a5fd9c5589204f32d9c31285a04b78096ba40a79b75677efc13"
check_and_fetch_params "$SAPLING_OUTPUT_NAME" "$PARAMS_DIR/$SAPLING_OUTPUT_NAME" "2f0ebbcbb9bb0bcffe95a397e7eba89c29eb4dde6191c339db88570e3f3fb0e4"
check_and_fetch_params "$SAPLING_SPROUT_GROTH16_NAME" "$PARAMS_DIR/$SAPLING_SPROUT_GROTH16_NAME" "b685d700c60328498fbde589c8c7c484c722b788b265b72af448a5bf0ee55b50"
}
if [ "${1:-}" = '--testnet' ]