kumquat-buildroot/support/download/helpers
Yann E. MORIN 6ec2b2cad4 support/download/helpers: use appropriate TAR
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>
(cherry picked from commit 86f6c7929e)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
2024-06-15 20:29:26 +02:00

99 lines
2.9 KiB
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Executable File

# Generate a reproducible archive from the content of a directory
#
# $1 : input directory
# $2 : leading component in archive
# $3 : ISO8601 date: YYYY-MM-DDThh:mm:ssZZ
# $4 : output file
# $5... : globs of filenames to exclude from the archive, suitable for
# find's -path option, and relative to the input directory $1
#
# Notes :
# - the timestamp is internally rounded to the highest entire second
# less than or equal to the timestamp (i.e. any sub-second fractional
# part is ignored)
# - must not be called with CWD as, or below, the input directory
# - some temporary files are created in CWD, and removed at the end
#
# Example:
# $ find /path/to/temp/dir
# /path/to/temp/dir/
# /path/to/temp/dir/some-file
# /path/to/temp/dir/some-dir/
# /path/to/temp/dir/some-dir/some-other-file
#
# $ mk_tar_gz /path/to/some/dir \
# foo_bar-1.2.3 \
# 1970-01-01T00:00:00Z \
# /path/to/foo.tar.gz \
# '.git/*' '.svn/*'
#
# $ tar tzf /path/to/foo.tar.gz
# foo_bar-1.2.3/some-file
# foo_bar-1.2.3/some-dir/some-other-file
#
mk_tar_gz() {
local in_dir="${1}"
local base_dir="${2}"
local date="${3}"
local out="${4}"
shift 4
local glob tmp pax_options
local -a find_opts
for glob; do
find_opts+=( -or -path "./${glob#./}" )
done
# Drop sub-second precision to play nice with GNU tar's valid_timespec check
date="$(date -d "${date}" -u +%Y-%m-%dT%H:%M:%S+00:00)"
pax_options="delete=atime,delete=ctime,delete=mtime"
pax_options+=",exthdr.name=%d/PaxHeaders/%f,exthdr.mtime={${date}}"
tmp="$(mktemp --tmpdir="$(pwd)")"
pushd "${in_dir}" >/dev/null
# Establish list
find . -not -type d -and -not \( -false "${find_opts[@]}" \) >"${tmp}.list"
# Sort list for reproducibility
LC_ALL=C sort <"${tmp}.list" >"${tmp}.sorted"
# Create POSIX tarballs, since that's the format the most reproducible
${TAR} cf - --transform="s#^\./#${base_dir}/#S" \
--numeric-owner --owner=0 --group=0 --mtime="${date}" \
--format=posix --pax-option="${pax_options}" \
-T "${tmp}.sorted" >"${tmp}.tar"
# Compress the archive
gzip -6 -n <"${tmp}.tar" >"${out}"
rm -f "${tmp}"{.list,.sorted,.tar}
popd >/dev/null
}
post_process_unpack() {
local dest="${1}"
local tarball="${2}"
local one_file
mkdir "${dest}"
${TAR} -C "${dest}" --strip-components=1 -xzf "${tarball}"
one_file="$(find "${dest}" -type f -print0 |LC_ALL=C sort -z |sed 's/\x0.*//')"
touch -r "${one_file}" "${dest}.timestamp"
}
post_process_repack() {
local in_dir="${1}"
local base_dir="${2}"
local out="${3}"
local date
date="@$(stat -c '%Y' "${in_dir}/${base_dir}.timestamp")"
mk_tar_gz "${in_dir}/${base_dir}" "${base_dir}" "${date}" "${out}"
}
# Keep this line and the following as last lines in this file.
# vim: ft=bash