find-outdated-patches

#!/usr/bin/env bash

# file      : find-outdated-patches
# license   : MIT

# Print the names of files under downstream/ that have changed upstream since
# the specified git revision.
#

owd="$(pwd)"
trap "{ cd '$owd'; exit 1; }" ERR
set -o errtrace     # Trap in functions and subshells.
set -o pipefail     # Fail if any pipeline command fails.
shopt -s lastpipe   # Execute last pipeline command in the current shell.
shopt -s nullglob   # Expand no-match globs to nothing rather than themselves.

function info () { echo "$*" 1>&2; }
function error () { info "$*"; exit 1; }

rev="$1" # The git revision.

if [[ -z "$rev" ]]; then
  error "usage: $(basename "$0") <git-revision>"
fi

# For each file in downstream/, use git-diff to check whether it has changed
# since the specified revision.
#
for f in $(find downstream/ -type f); do
  f="${f/'downstream/qtbase/'/}" # Path relative to upstream/qtbase/.
  f="${f%.in}"                   # Strip .in suffix, if present.

  if [[ "$(git -C upstream/qtbase/ diff --name-only "$rev" -- "$f")" ]]; then
    echo "qtbase/$f"
  fi
done