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#!/usr/bin/env bash
#
# This script assumes a linux environment
set -e
# To be executed at the root of CDN repo
#
# It's not being hosted at CDN because that
# repo is also used as a website
VERSION=$1
if [[ -z $VERSION ]]; then
echo "Error: No version provided, aborting"
exit 1
fi
PATCHES_DIR=$2
if [[ -z $PATCHES_DIR ]]; then
echo "Error: patches directory is not provided, aborting"
exit 1
fi
PREVIOUS_VERSION=$(<version)
PREVIOUS_PATCH_FILE="$PATCHES_DIR/$PREVIOUS_VERSION.patch"
: > "$PREVIOUS_PATCH_FILE"
NEXT_PATCH_FILE="$PATCHES_DIR/$VERSION.patch"
# Temporary file to receive the RCS patch data
DIFF=$(mktemp)
FILES=( $(git diff --name-only) )
for FILE in "${FILES[@]}"; do
# Reference:
# https://github.com/ameshkov/diffupdates
if (head "$FILE" | grep -q '^! Version: '); then
sed -Ei "1,10s;^! Version: .+$;! Version: $VERSION;" "$FILE"
fi
# Patches are for filter lists supporting differential updates
if (head "$FILE" | grep -q '^! Diff-Path: '); then
# Extract diff name from `! Diff-Path:` field
DIFF_NAME=$(grep -m 1 -oP '^! Diff-Path: [^#]+#?\K.*' "$FILE")
# Fall back to `! Diff-Name:` field if no name found
# Remove once `! Diff-Name:` is no longer needed after transition
if [[ -z $DIFF_NAME ]]; then
DIFF_NAME=$(grep -m 1 -oP '^! Diff-Name: \K.+' "$FILE")
fi
echo "Info: Diff name for ${FILE} is ${DIFF_NAME}"
# We need a patch name to generate a valid patch
if [[ -n $DIFF_NAME ]]; then
# Compute relative patch path
PATCH_PATH="$(realpath --relative-to="$(dirname "$FILE")" "$NEXT_PATCH_FILE")"
# Fill in patch path to next version (do not clobber hash portion)
sed -Ei "1,10s;^! Diff-Path: [^#]+(#.+)?$;! Diff-Path: $PATCH_PATH\1;" "$FILE"
# Compute the RCS diff between current version and new version
git show "HEAD:$FILE" | diff -n - "$FILE" > "$DIFF" || true
FILE_CHECKSUM="$(sha1sum "$FILE")"
FILE_CHECKSUM=${FILE_CHECKSUM:0:10}
DIFF_LINES=$(wc -l < "$DIFF")
echo "Info: Computed patch for ${FILE} has ${DIFF_LINES} lines"
# Populate output file with patch information
echo "Info: Adding patch data of ${FILE} to ${PREVIOUS_PATCH_FILE}"
echo "diff name:$DIFF_NAME lines:$DIFF_LINES checksum:$FILE_CHECKSUM" >> "$PREVIOUS_PATCH_FILE"
cat "$DIFF" >> "$PREVIOUS_PATCH_FILE"
else
echo "Error: Diff name not found, skipping"
fi
fi
# Stage changed file
echo "Info: Staging $FILE"
git add -u "$FILE"
done
# Create a patch only if there was a previous version
if [[ -n $PREVIOUS_VERSION ]]; then
echo "Info: Staging $PREVIOUS_PATCH_FILE"
git add "$PREVIOUS_PATCH_FILE"
fi
echo -n "$VERSION" > version
git add version
rm -f "$DIFF"
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