#!/bin/sh

# Help create a deterministic distribution tarball with timestamps
# based on the time of the latest git commit.

set -eu

distdir="$1"

# This will work for git or for tarball
#
# Note: we give the .tarball file the exact same timestamp as the git commit,
# so producing a tarball from a tarball should also create the exact same
# output.

stamp="$(cd "${0%/*}/.." && git show --format=%ct --no-patch 2>/dev/null || stat -c %Y version.m4)"

test -n "${stamp}"

timestamp() {
    find "$@" -exec touch -d "@${stamp}" '{}' '+'
    stamp="$((stamp + 1))"
}

# we add the date of the release to the Cockpit Client metainfo
sed -i "s/@DATE@/$(date -d@${stamp} +'%Y-%m-%d')/" \
    "${distdir}/src/client/org.cockpit_project.CockpitClient.metainfo.xml"

# all files get the same timestamp as the commit date
timestamp "${distdir}"

# aclocal.m4 comes next
timestamp "${distdir}/aclocal.m4"

# then the other automake generated files
timestamp \
    "${distdir}/config.h.in" \
    "${distdir}/configure" \
    "${distdir}/Makefile.in"

# package-lock.json needs to be newer than package.json
timestamp "${distdir}/package-lock.json"

# and dist/ needs to be newer than that
timestamp "${distdir}/dist"

# finally, the directories should be newer than everything else
timestamp "${distdir}" -type d
