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# Copyright 1999-2019 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
# @ECLASS: vcs-snapshot.eclass
# @MAINTAINER:
# mgorny@gentoo.org
# @SUPPORTED_EAPIS: 0 1 2 3 4 5 6 7
# @BLURB: support eclass for unpacking VCS snapshot tarballs
# @DESCRIPTION:
# THIS ECLASS IS NOT NECESSARY FOR MODERN GITHUB AND GITLAB SNAPSHOTS.
# THEIR DIRECTORY STRUCTURE IS ENTIRELY PREDICTABLE, SO UPDATE YOUR
# EBUILD TO USE /ARCHIVE/ URI AND SET S IF NECESSARY.
#
# This eclass provides a convenience src_unpack() which does unpack all
# the tarballs in SRC_URI to locations matching their (local) names,
# discarding the original parent directory.
#
# The typical use case are VCS tag snapshots coming from BitBucket
# (but not GitHub or GitLab). They have hash appended to the directory
# name which makes extracting them a painful experience. But if you are
# using a SRC_URI arrow to rename them (which quite likely you have to
# do anyway), vcs-snapshot will just extract them into matching
# directories.
#
# Please note that this eclass handles only tarballs (.tar, .tar.gz,
# .tar.bz2 & .tar.xz). For any other file format (or suffix) it will
# fall back to regular unpack. Support for additional formats may be
# added in the future if necessary.
#
# @EXAMPLE:
#
# @CODE
# EAPI=7
# inherit vcs-snapshot
#
# SRC_URI="
# https://bitbucket.org/foo/bar/get/${PV}.tar.bz2 -> ${P}.tar.bz2
# https://bitbucket.org/foo/bar-otherstuff/get/${PV}.tar.bz2
# -> ${P}-otherstuff.tar.bz2"
# @CODE
#
# and however the tarballs were originally packed, all files will appear
# in ${WORKDIR}/${P} and ${WORKDIR}/${P}-otherstuff respectively.
case ${EAPI:-0} in
0|1|2|3|4|5|6|7) ;;
*) die "vcs-snapshot.eclass API in EAPI ${EAPI} not yet established."
esac
EXPORT_FUNCTIONS src_unpack
# @FUNCTION: vcs-snapshot_src_unpack
# @DESCRIPTION:
# Extract all the archives from ${A}. The .tar, .tar.gz, .tar.bz2
# and .tar.xz archives will be unpacked to directories matching their
# local names. Other archive types will be passed down to regular
# unpack.
vcs-snapshot_src_unpack() {
debug-print-function ${FUNCNAME} "${@}"
local renamed_any=
local f
for f in ${A}
do
case "${f}" in
*.tar|*.tar.gz|*.tar.bz2|*.tar.xz)
local destdir=${WORKDIR}/${f%.tar*}
debug-print "${FUNCNAME}: unpacking ${f} to ${destdir}"
local l topdirs=()
while read -r l; do
topdirs+=( "${l}" )
done < <(tar -t -f "${DISTDIR}/${f}" | cut -d/ -f1 | sort -u)
if [[ ${#topdirs[@]} -gt 1 ]]; then
eerror "The archive ${f} contains multiple or no top directory."
eerror "It is impossible for vcs-snapshot to unpack this correctly."
eerror "Top directories found:"
local d
for d in "${topdirs[@]}"; do
eerror " ${d}"
done
die "${FUNCNAME}: Invalid directory structure in archive ${f}"
fi
[[ ${topdirs[0]} != ${f%.tar*} ]] && renamed_any=1
mkdir "${destdir}" || die
# -o (--no-same-owner) to avoid restoring original owner
einfo "Unpacking ${f}"
tar -C "${destdir}" -x -o --strip-components 1 \
-f "${DISTDIR}/${f}" || die
;;
*)
debug-print "${FUNCNAME}: falling back to unpack for ${f}"
# fall back to the default method
unpack "${f}"
;;
esac
done
if [[ ! ${renamed_any} ]]; then
local w=eerror
[[ ${EAPI} == [0123456] ]] && w=eqawarn
"${w}" "${FUNCNAME} did not find any archives that needed renaming."
"${w}" "Please verify that its usage is really necessary, and remove"
"${w}" "the inherit if it is not."
[[ ${w} == eerror ]] && die "${FUNCNAME}: Unnecessary usage detected"
fi
}
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