#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
# perf archive
# Arnaldo Carvalho de Melo <acme@redhat.com>

PERF_DATA=perf.data
PERF_SYMBOLS=perf.symbols
PERF_ALL=perf.all
ALL=0
UNPACK=0

while [ $# -gt 0 ] ; do
	if [ $1 == "--all" ]; then
		ALL=1
		shift
	elif [ $1 == "--unpack" ]; then
		UNPACK=1
		shift
	elif [ $1 == "--exclude-buildids" ]; then
		EXCLUDE_BUILDIDS="$2"
		if [ ! -e "$EXCLUDE_BUILDIDS" ]; then
			echo "Provided exclude-buildids file $EXCLUDE_BUILDIDS does not exist"
			exit 1
		fi
		shift 2
	else
		PERF_DATA=$1
		UNPACK_TAR=$1
		shift
	fi
done

if [ $UNPACK -eq 1 ]; then
	if [ ! -z "$UNPACK_TAR" ]; then					# tar given as an argument
		if [ ! -e "$UNPACK_TAR" ]; then
			echo "Provided file $UNPACK_TAR does not exist"
			exit 1
		fi
		TARGET="$UNPACK_TAR"
	else																# search for perf tar in the current directory
		TARGET=`find . -regex "\./perf.*\.tar\.bz2"`
		TARGET_NUM=`echo -n "$TARGET" | grep -c '^'`

		if [ -z "$TARGET" ] || [ $TARGET_NUM -gt 1 ]; then
			echo -e "Error: $TARGET_NUM files found for unpacking:\n$TARGET"
			echo "Provide the requested file as an argument"
			exit 1
		else
			echo "Found target file for unpacking: $TARGET"
		fi
	fi

	if [[ "$TARGET" =~ (\./)?$PERF_ALL.*.tar.bz2 ]]; then				# perf tar generated by --all option
		TAR_CONTENTS=`tar tvf "$TARGET" | tr -s " " | cut -d " " -f 6`
		VALID_TAR=`echo "$TAR_CONTENTS" | grep "$PERF_SYMBOLS.tar.bz2" | wc -l`		# check if it contains a sub-tar perf.symbols
		if [ $VALID_TAR -ne 1 ]; then
			echo "Error: $TARGET file is not valid (contains zero or multiple sub-tar files with debug symbols)"
			exit 1
		fi

		INTERSECT=`comm -12 <(ls) <(echo "$TAR_CONTENTS") | tr "\n" " "`	# check for overwriting
		if [ ! -z "$INTERSECT" ]; then										# prompt if file(s) already exist in the current directory
			echo "File(s) ${INTERSECT::-1} already exist in the current directory."
			while true; do
				read -p 'Do you wish to overwrite them? ' yn
				case $yn in
					[Yy]* ) break;;
					[Nn]* ) exit 1;;
					* ) echo "Please answer yes or no.";;
				esac
			done
		fi

		# unzip the perf.data file in the current working directory	and debug symbols in ~/.debug directory
		tar xvf $TARGET && tar xvf $PERF_SYMBOLS.tar.bz2 -C ~/.debug

	else																# perf tar generated by perf archive (contains only debug symbols)
		tar xvf $TARGET -C ~/.debug
	fi
	exit 0
fi

#
# PERF_BUILDID_DIR environment variable set by perf
# path to buildid directory, default to $HOME/.debug
#
if [ -z $PERF_BUILDID_DIR ]; then
	PERF_BUILDID_DIR=~/.debug/
else
        # append / to make substitutions work
        PERF_BUILDID_DIR=$PERF_BUILDID_DIR/
fi

BUILDIDS=$(mktemp /tmp/perf-archive-buildids.XXXXXX)

#
# EXCLUDE_BUILDIDS is an optional file that contains build-ids to be excluded from the
# archive. It is a list of build-ids, one per line, without any leading or trailing spaces.
# If the file is empty, all build-ids will be included in the archive. To create a exclude-
# buildids file, you can use the following command:
# 	perf buildid-list -i perf.data --with-hits | grep -v "^ " > exclude_buildids.txt
# You can edit the file to remove the lines that you want to keep in the archive, then:
# 	perf archive --exclude-buildids exclude_buildids.txt
#
if [ -s "$EXCLUDE_BUILDIDS" ]; then
	perf buildid-list -i $PERF_DATA --with-hits | grep -v "^ " | grep -Fv -f $EXCLUDE_BUILDIDS > $BUILDIDS
	if [ ! -s "$BUILDIDS" ] ; then
		echo "perf archive: no build-ids found after applying exclude-buildids file"
		rm $BUILDIDS || true
		exit 1
	fi
else
	perf buildid-list -i $PERF_DATA --with-hits | grep -v "^ " > $BUILDIDS
	if [ ! -s "$BUILDIDS" ] ; then
		echo "perf archive: no build-ids found"
		rm $BUILDIDS || true
		exit 1
	fi
fi

MANIFEST=$(mktemp /tmp/perf-archive-manifest.XXXXXX)
PERF_BUILDID_LINKDIR=$(readlink -f $PERF_BUILDID_DIR)/

cut -d ' ' -f 1 $BUILDIDS | \
while read build_id ; do
	linkname=$PERF_BUILDID_DIR.build-id/${build_id:0:2}/${build_id:2}
	filename=$(readlink -f $linkname)
	echo ${linkname#$PERF_BUILDID_DIR} >> $MANIFEST
	echo ${filename#$PERF_BUILDID_LINKDIR} >> $MANIFEST
done

if [ $ALL -eq 1 ]; then						# pack perf.data file together with tar containing debug symbols
	HOSTNAME=$(hostname)
	DATE=$(date '+%Y%m%d-%H%M%S')
	tar cjf $PERF_SYMBOLS.tar.bz2 -C $PERF_BUILDID_DIR -T $MANIFEST
	tar cjf	$PERF_ALL-$HOSTNAME-$DATE.tar.bz2 $PERF_DATA $PERF_SYMBOLS.tar.bz2
	rm $PERF_SYMBOLS.tar.bz2 $MANIFEST $BUILDIDS || true
else										# pack only the debug symbols
	tar cjf $PERF_DATA.tar.bz2 -C $PERF_BUILDID_DIR -T $MANIFEST
	rm $MANIFEST $BUILDIDS || true
fi

echo -e "Now please run:\n"
echo -e "$ perf archive --unpack\n"
echo "or unpack the tar manually wherever you need to run 'perf report' on."
exit 0