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|
#!/bin/sh
# srcdist.rawball: extract and repackage a subset of unmodified source files
# from a known upstream source distribution tarball, along with a manifest.
# this file is covered by COPYING.SRCDIST.
set -eu
mb_ruledir=
mb_rawball=
mb_tarball=
mb_tarball_sha256=
mb_script="$0"
mb_status=1
mb_manifest=MANIFEST.rawball
export LC_ALL=C
rawball_usage()
{
printf 'usage: %s\n' "$mb_script" >&2
printf '\t%s\n' \
'--ruledir=/path/to/rule/dir' \
'--tarball=/path/to/upstream.tar.xz' \
'--tarball-sha256=upstream-signature' \
'--rawball=output-tarball-name' \
>&2
printf '\nThis will extract and repackage a subset of unmodified source\n' >&2
printf ' files from a known upstream source distribution tarball,\n' >&2
printf ' along with a manifest.\n\n' >&2
printf '\nThe --ruledir argument should point to a directory containing the following files:\n' >&2
printf ' upstream.sha256.known\n' >&2
printf ' rawball.include.patterns (appropriate for pax)\n' >&2
printf ' rawball.exclude.patterns (appropriate for grep -v -f)\n\n' >&2
exit ${mb_status}
}
for arg ; do
case "$arg" in
--ruledir=*)
mb_ruledir=${arg#*=}
;;
--rawball=*)
mb_rawball=${arg#*=}
;;
--tarball=*)
mb_tarball=${arg#*=}
;;
--tarball-sha256=*)
mb_tarball_sha256=${arg#*=}
;;
*)
printf '\n*** %s: unsupported argument!' "$mb_script" >&2
printf '\n*** %s\n' "${arg#}" >&2
exit 2
esac
done
rawball_ruledir_error()
{
mb_status=2
printf '\n*** %s: a required file in %s is missing!\n\n' "$mb_script" "$mb_ruledir" >&2
rawball_usage
}
rawball_init_vars()
{
if [ -z ${mb_ruledir:-} ]; then
rawball_usage
fi
if [ -z ${mb_rawball:-} ] || [ -z ${mb_tarball:-} ] || [ -z ${mb_tarball_sha256:-} ]; then
rawball_usage
fi
eval mb_ruledir=$(printf '%s' "$mb_ruledir")
eval mb_tarball=$(printf '%s' "$mb_tarball")
stat "$mb_ruledir/upstream.sha256.known" > /dev/null || rawball_ruledir_error
stat "$mb_ruledir/rawball.include.patterns" > /dev/null || rawball_ruledir_error
stat "$mb_ruledir/rawball.exclude.patterns" > /dev/null || rawball_ruledir_error
mb_known_sha256=$(grep "$mb_tarball_sha256" "${mb_ruledir}/upstream.sha256.known" || true)
mb_known_sha256="${mb_known_sha256%% *}"
if [ "$mb_known_sha256" != "$mb_tarball_sha256" ]; then
printf '\n*** %s: %s is not a known sha-256 signature!\n\n' "$mb_script" "$mb_tarball_sha256" >&2
exit 2
fi
}
rawball_verify_sha256_signature()
{
mb_tarball_sha256_test=$(sha256sum "$mb_tarball")
mb_tarball_sha256_test="${mb_tarball_sha256_test%% *}"
if [ "$mb_tarball_sha256_test" != "$mb_tarball_sha256" ]; then
printf '\n*** %s: sha-256 signature does not match!\n\n' "$mb_script" >&2
exit 2
fi
}
rawball_extract_upstream_tarball()
{
mb_rawball_files=$(xz -d -c -f "$mb_tarball" \
| pax $(cat "$mb_ruledir/rawball.include.patterns") \
| grep -v -f "${mb_ruledir}/rawball.exclude.patterns" \
| sort)
mb_topdir=$(printf '%s\n' ${mb_rawball_files} | sed -n 1p)
mb_topdir=${mb_topdir%%/*}
mb_rawdir=${mb_topdir}.raw
if [ -d ${mb_rawdir} ]; then
printf '\n*** %s: the directory `%s already exists!\n\n' "$mb_script" "${mb_rawdir}'" >&2
exit 2
fi
mkdir ${mb_rawdir}
xz -d -c -f "$mb_tarball" | pax -d -r -s "/^${mb_topdir}/${mb_rawdir}/" ${mb_rawball_files}
mb_packed=$(find ${mb_rawdir} -type f | sort)
mb_refobj=$(find ${mb_rawdir} -type f -printf "%T@ %p\n" | sort -n | cut -d' ' -f 2- | tail -n 1)
mb_status=$(cd -- ${mb_rawdir}; sha256sum $(find . -type f | sort) > ${mb_manifest})
touch -a -c -m -r ${mb_refobj} $(find ${mb_rawdir} -type d)
touch -a -c -m -r ${mb_refobj} ${mb_rawdir}/${mb_manifest}
touch -a -c -m -r ${mb_refobj} ${mb_rawdir}
}
rawball_create_downstream_rawball()
{
pax -w -x tar ${mb_packed} ${mb_rawdir}/${mb_manifest} | xz -c > "$mb_rawball"
}
# init variables and verify arguments
rawball_init_vars
# validate input
rawball_verify_sha256_signature
# extract tarball (top-level directory must not exist)
rawball_extract_upstream_tarball
# create downstream rawball of unmodified source files
rawball_create_downstream_rawball
# all done
exit 0
|
