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#!/usr/bin/env bash
set -e
die() {
echo "$0: error: $1" >&2
exit 1
}
# Usage: update-source-hash <attr> <version> [<new-source-hash>]
attr=$1
newVersion=$2
newHash=$3
nixFile=$(nix-instantiate --eval --strict -A "$attr.meta.position" | sed -re 's/^"(.*):[0-9]+"$/\1/')
if [ ! -f "$nixFile" ]; then
die "Couldn't evaluate '$attr.meta.position' to locate the .nix file!"
fi
oldHashAlgo=$(nix-instantiate --eval --strict -A "$attr.src.drvAttrs.outputHashAlgo" | tr -d '"')
oldHash=$(nix-instantiate --eval --strict -A "$attr.src.drvAttrs.outputHash" | tr -d '"')
if [ -z "$oldHashAlgo" -o -z "$oldHash" ]; then
die "Couldn't evaluate old source hash from '$attr.src'!"
fi
if [ $(grep -c "$oldHash" "$nixFile") != 1 ]; then
die "Couldn't locate old source hash '$oldHash' (or it appeared more than once) in '$nixFile'!"
fi
drvName=$(nix-instantiate --eval -E "with import ./. {}; (builtins.parseDrvName $attr.name).name" | tr -d '"')
oldVersion=$(nix-instantiate --eval -E "with import ./. {}; $attr.version or (builtins.parseDrvName $attr.name).version" | tr -d '"')
if [ -z "$drvName" -o -z "$oldVersion" ]; then
die "Couldn't evaluate name and version from '$attr.name'!"
fi
if [ "$oldVersion" = "$newVersion" ]; then
echo "$0: New version same as old version, nothing to do." >&2
exit 0
fi
# Escape regex metacharacter that are allowed in store path names
oldVersion=$(echo "$oldVersion" | sed -re 's|[.+]|\\&|g')
if [ $(grep -c -E "^\s*(let\b)?\s*version\s*=\s*\"$oldVersion\"" "$nixFile") = 1 ]; then
pattern="/\bversion\b\s*=/ s|\"$oldVersion\"|\"$newVersion\"|"
elif [ $(grep -c -E "^\s*(let\b)?\s*name\s*=\s*\"[^\"]+-$oldVersion\"" "$nixFile") = 1 ]; then
pattern="/\bname\b\s*=/ s|-$oldVersion\"|-$newVersion\"|"
else
die "Couldn't figure out where out where to patch in new version in '$attr'!"
fi
# Replace new version
sed -i.bak "$nixFile" -re "$pattern"
if cmp -s "$nixFile" "$nixFile.bak"; then
die "Failed to replace version '$oldVersion' to '$newVersion' in '$attr'!"
fi
case "$oldHashAlgo" in
sha256) hashLength=64 ;;
sha512) hashLength=128 ;;
*) die "Unhandled hash algorithm '$oldHashAlgo' in '$attr'!" ;;
esac
# Make a temporary all-zeroes hash of $hashLength characters
tempHash=$(printf '%0*d' "$hashLength" 0)
sed -i "$nixFile" -re "s|\"$oldHash\"|\"$tempHash\"|"
if cmp -s "$nixFile" "$nixFile.bak"; then
die "Failed to replace source hash of '$attr' to a temporary hash!"
fi
# If new hash not given on the command line, recalculate it ourselves.
if [ -z "$newHash" ]; then
nix-build --no-out-link -A "$attr.src" 2>"$attr.fetchlog" >/dev/null || true
# FIXME: use nix-build --hash here once https://github.com/NixOS/nix/issues/1172 is fixed
newHash=$(egrep -v "killing process|dependencies couldn't be built" "$attr.fetchlog" | tail -n2 | sed "s~output path .* has .* hash \(.*\) when .* was expected|fixed-output derivation produced path '.*' with .* hash '\(.*\)' instead of the expected hash '.*'~\1\2~" | head -n1)
fi
if [ -z "$newHash" ]; then
cat "$attr.fetchlog" >&2
die "Couldn't figure out new hash of '$attr.src'!"
fi
if [ "$oldVersion" != "$newVersion" ] && [ "$oldHash" = "$newHash" ]; then
mv "$nixFile.bak" "$nixFile"
die "Both the old and new source hashes of '$attr.src' were equivalent. Please fix the package's source URL to be dependent on '\${version}'!"
fi
sed -i "$nixFile" -re "s|\"$tempHash\"|\"$newHash\"|"
if cmp -s "$nixFile" "$nixFile.bak"; then
die "Failed to replace temporary source hash of '$attr' to the final source hash!"
fi
rm -f "$nixFile.bak"
rm -f "$attr.fetchlog"
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