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#!/bin/bash
# Packs and unpacks files for Travis CI cache.
#
# Copyright (C) 2019 Peter Wu <peter@lekensteyn.nl>
# SPDX-License-Identifier: GPL-2.0-or-later
#
# Travis CI currently has a bug that prevents absolute paths from being cached.
# See https://github.com/travis-ci/casher/pull/38
# As a workaround, manually pack directories into an uncompressed tarball
# (which will be bzip2-compressed by casher). An additional advantage is that
# casher has to check fewer files to determine whether it is out of date.
pre_restore() {
restored_files=()
echo "Contents of ${cachedir}:"
ls -la "$cachedir"
echo
}
do_restore() {
local tarball="$cachedir/$1" path="$2"
if [ -e "$tarball" ]; then
echo "Restoring ${path}..."
time tar -xPf "$tarball" "$path"
restored_files+=("$1")
fi
}
post_restore() {
# Remove old cache entries if any.
mkdir "${cachedir}.new"
for file in "${restored_files[@]}"; do
mv "$cachedir/$file" "${cachedir}.new/"
done
if oldfiles=$(ls -lA "$cachedir" | grep -v ^total); then
echo "Removed stale cache entries:"
echo "$oldfiles"
echo
fi
rm -rf "$cachedir"
mv "${cachedir}.new" "$cachedir"
}
pre_save() { :;}
do_save() {
local tarball="$cachedir/$1" path="$2"
if [ ! -e "$path" ]; then
echo "Cannot cache $path as it is missing."
return
fi
if [ -e "$tarball" ]; then
if ! [ "$path" -nt "$tarball" ]; then
echo "No changes detected in ${path}."
return
fi
echo "Saving new version of ${path}..."
else
echo "Saving $path for the first time..."
fi
time tar -cPf "$tarball" "$path"
}
post_save() {
echo "New contents of ${cachedir}:"
ls -la "$cachedir"
echo
}
main() {
# Cache directories are relative to this path.
cd "$TRAVIS_BUILD_DIR"
pwd
cachedir=travis-cache
mkdir -p "$cachedir"
"pre_$1"
"do_$1" wireshark-libs.tar "$WIRESHARK_BASE_DIR"
"do_$1" Qt.tar "$QT5_BASE_DIR"
"post_$1"
}
# Merge stderr to stdout to prevent stderr from ending up in future output.
main "$1" 2>&1
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