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# Copyright 1999-2020 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
# @ECLASS: unpacker.eclass
# @MAINTAINER:
# base-system@gentoo.org
# @BLURB: helpers for extraneous file formats and consistent behavior across EAPIs
# @DESCRIPTION:
# Some extraneous file formats are not part of PMS, or are only in certain
# EAPIs. Rather than worrying about that, support the crazy cruft here
# and for all EAPI versions.
# Possible todos:
# - merge rpm unpacking
# - support partial unpacks?
if [[ -z ${_UNPACKER_ECLASS} ]]; then
_UNPACKER_ECLASS=1
inherit toolchain-funcs
# @ECLASS-VARIABLE: UNPACKER_BZ2
# @DEFAULT_UNSET
# @DESCRIPTION:
# Utility to use to decompress bzip2 files. Will dynamically pick between
# `pbzip2` and `bzip2`. Make sure your choice accepts the "-dc" options.
# Note: this is meant for users to set, not ebuilds.
# @ECLASS-VARIABLE: UNPACKER_LZIP
# @DEFAULT_UNSET
# @DESCRIPTION:
# Utility to use to decompress lzip files. Will dynamically pick between
# `plzip`, `pdlzip` and `lzip`. Make sure your choice accepts the "-dc" options.
# Note: this is meant for users to set, not ebuilds.
# for internal use only (unpack_pdv and unpack_makeself)
find_unpackable_file() {
local src=$1
if [[ -z ${src} ]] ; then
src=${DISTDIR}/${A}
else
if [[ ${src} == ./* ]] ; then
: # already what we want
elif [[ -e ${DISTDIR}/${src} ]] ; then
src=${DISTDIR}/${src}
elif [[ -e ${PWD}/${src} ]] ; then
src=${PWD}/${src}
elif [[ -e ${src} ]] ; then
src=${src}
fi
fi
[[ ! -e ${src} ]] && return 1
echo "${src}"
}
unpack_banner() {
echo ">>> Unpacking ${1##*/} to ${PWD}"
}
# @FUNCTION: unpack_pdv
# @USAGE: <file to unpack> <size of off_t>
# @DESCRIPTION:
# Unpack those pesky pdv generated files ...
# They're self-unpacking programs with the binary package stuffed in
# the middle of the archive. Valve seems to use it a lot ... too bad
# it seems to like to segfault a lot :(. So lets take it apart ourselves.
#
# You have to specify the off_t size ... I have no idea how to extract that
# information out of the binary executable myself. Basically you pass in
# the size of the off_t type (in bytes) on the machine that built the pdv
# archive.
#
# One way to determine this is by running the following commands:
#
# @CODE
# strings <pdv archive> | grep lseek
# strace -elseek <pdv archive>
# @CODE
#
# Basically look for the first lseek command (we do the strings/grep because
# sometimes the function call is _llseek or something) and steal the 2nd
# parameter. Here is an example:
#
# @CODE
# $ strings hldsupdatetool.bin | grep lseek
# lseek
# $ strace -elseek ./hldsupdatetool.bin
# lseek(3, -4, SEEK_END) = 2981250
# @CODE
#
# Thus we would pass in the value of '4' as the second parameter.
unpack_pdv() {
local src=$(find_unpackable_file "$1")
local sizeoff_t=$2
[[ -z ${src} ]] && die "Could not locate source for '$1'"
[[ -z ${sizeoff_t} ]] && die "No idea what off_t size was used for this pdv :("
unpack_banner "${src}"
local metaskip=$(tail -c ${sizeoff_t} "${src}" | hexdump -e \"%i\")
local tailskip=$(tail -c $((${sizeoff_t}*2)) "${src}" | head -c ${sizeoff_t} | hexdump -e \"%i\")
# grab metadata for debug reasons
local metafile="${T}/${FUNCNAME}.meta"
tail -c +$((${metaskip}+1)) "${src}" > "${metafile}"
# rip out the final file name from the metadata
local datafile=$(tail -c +$((${metaskip}+1)) "${src}" | strings | head -n 1)
datafile=$(basename "${datafile}")
# now lets uncompress/untar the file if need be
local tmpfile="${T}/${FUNCNAME}"
tail -c +$((${tailskip}+1)) ${src} 2>/dev/null | head -c 512 > "${tmpfile}"
local iscompressed=$(file -b "${tmpfile}")
if [[ ${iscompressed:0:8} == "compress" ]] ; then
iscompressed=1
mv "${tmpfile}"{,.Z}
gunzip "${tmpfile}"
else
iscompressed=0
fi
local istar=$(file -b "${tmpfile}")
if [[ ${istar:0:9} == "POSIX tar" ]] ; then
istar=1
else
istar=0
fi
#for some reason gzip dies with this ... dd cant provide buffer fast enough ?
#dd if=${src} ibs=${metaskip} count=1 \
# | dd ibs=${tailskip} skip=1 \
# | gzip -dc \
# > ${datafile}
if [ ${iscompressed} -eq 1 ] ; then
if [ ${istar} -eq 1 ] ; then
tail -c +$((${tailskip}+1)) "${src}" 2>/dev/null \
| head -c $((${metaskip}-${tailskip})) \
| tar -xzf -
else
tail -c +$((${tailskip}+1)) "${src}" 2>/dev/null \
| head -c $((${metaskip}-${tailskip})) \
| gzip -dc \
> ${datafile}
fi
else
if [ ${istar} -eq 1 ] ; then
tail -c +$((${tailskip}+1)) "${src}" 2>/dev/null \
| head -c $((${metaskip}-${tailskip})) \
| tar --no-same-owner -xf -
else
tail -c +$((${tailskip}+1)) "${src}" 2>/dev/null \
| head -c $((${metaskip}-${tailskip})) \
> ${datafile}
fi
fi
true
#[ -s "${datafile}" ] || die "failure unpacking pdv ('${metaskip}' '${tailskip}' '${datafile}')"
#assert "failure unpacking pdv ('${metaskip}' '${tailskip}' '${datafile}')"
}
# @FUNCTION: unpack_makeself
# @USAGE: [file to unpack] [offset] [tail|dd]
# @DESCRIPTION:
# Unpack those pesky makeself generated files ...
# They're shell scripts with the binary package tagged onto
# the end of the archive. Loki utilized the format as does
# many other game companies.
#
# If the file is not specified, then ${A} is used. If the
# offset is not specified then we will attempt to extract
# the proper offset from the script itself.
unpack_makeself() {
local src_input=${1:-${A}}
local src=$(find_unpackable_file "${src_input}")
local skip=$2
local exe=$3
[[ -z ${src} ]] && die "Could not locate source for '${src_input}'"
unpack_banner "${src}"
if [[ -z ${skip} ]] ; then
local ver=$(grep -m1 -a '#.*Makeself' "${src}" | awk '{print $NF}')
local skip=0
exe=tail
case ${ver} in
1.5.*|1.6.0-nv*) # tested 1.5.{3,4,5} ... guessing 1.5.x series is same
skip=$(grep -a ^skip= "${src}" | cut -d= -f2)
;;
2.0|2.0.1)
skip=$(grep -a ^$'\t'tail "${src}" | awk '{print $2}' | cut -b2-)
;;
2.1.1)
skip=$(grep -a ^offset= "${src}" | awk '{print $2}' | cut -b2-)
(( skip++ ))
;;
2.1.2)
skip=$(grep -a ^offset= "${src}" | awk '{print $3}' | head -n 1)
(( skip++ ))
;;
2.1.3)
skip=`grep -a ^offset= "${src}" | awk '{print $3}'`
(( skip++ ))
;;
2.1.4|2.1.5|2.1.6|2.2.0|2.4.0)
skip=$(grep -a offset=.*head.*wc "${src}" | awk '{print $3}' | head -n 1)
skip=$(head -n ${skip} "${src}" | wc -c)
exe="dd"
;;
*)
eerror "I'm sorry, but I was unable to support the Makeself file."
eerror "The version I detected was '${ver}'."
eerror "Please file a bug about the file ${src##*/} at"
eerror "https://bugs.gentoo.org/ so that support can be added."
die "makeself version '${ver}' not supported"
;;
esac
debug-print "Detected Makeself version ${ver} ... using ${skip} as offset"
fi
case ${exe} in
tail) exe=( tail -n +${skip} "${src}" );;
dd) exe=( dd ibs=${skip} skip=1 if="${src}" );;
*) die "makeself cant handle exe '${exe}'"
esac
# lets grab the first few bytes of the file to figure out what kind of archive it is
local filetype tmpfile="${T}/${FUNCNAME}"
"${exe[@]}" 2>/dev/null | head -c 512 > "${tmpfile}"
filetype=$(file -b "${tmpfile}") || die
case ${filetype} in
*tar\ archive*)
"${exe[@]}" | tar --no-same-owner -xf -
;;
bzip2*)
"${exe[@]}" | bzip2 -dc | tar --no-same-owner -xf -
;;
gzip*)
"${exe[@]}" | tar --no-same-owner -xzf -
;;
compress*)
"${exe[@]}" | gunzip | tar --no-same-owner -xf -
;;
XZ*)
"${exe[@]}" | unxz | tar --no-same-owner -xf -
;;
*)
eerror "Unknown filetype \"${filetype}\" ?"
false
;;
esac
assert "failure unpacking (${filetype}) makeself ${src##*/} ('${ver}' +${skip})"
}
# @FUNCTION: unpack_deb
# @USAGE: <one deb to unpack>
# @DESCRIPTION:
# Unpack a Debian .deb archive in style.
unpack_deb() {
[[ $# -eq 1 ]] || die "Usage: ${FUNCNAME} <file>"
local deb=$(find_unpackable_file "$1")
unpack_banner "${deb}"
# on AIX ar doesn't work out as their ar used a different format
# from what GNU ar (and thus what .deb files) produce
if [[ -n ${EPREFIX} ]] ; then
{
read # global header
[[ ${REPLY} = "!<arch>" ]] || die "${deb} does not seem to be a deb archive"
local f timestamp uid gid mode size magic
while read f timestamp uid gid mode size magic ; do
[[ -n ${f} && -n ${size} ]] || continue # ignore empty lines
if [[ ${f} = "data.tar"* ]] ; then
head -c "${size}" > "${f}"
else
head -c "${size}" > /dev/null # trash it
fi
done
} < "${deb}"
else
$(tc-getBUILD_AR) x "${deb}" || die
fi
unpacker ./data.tar*
# Clean things up #458658. No one seems to actually care about
# these, so wait until someone requests to do something else ...
rm -f debian-binary {control,data}.tar*
}
# @FUNCTION: unpack_cpio
# @USAGE: <one cpio to unpack>
# @DESCRIPTION:
# Unpack a cpio archive, file "-" means stdin.
unpack_cpio() {
[[ $# -eq 1 ]] || die "Usage: ${FUNCNAME} <file>"
# needed as cpio always reads from stdin
local cpio_cmd=( cpio --make-directories --extract --preserve-modification-time )
if [[ $1 == "-" ]] ; then
unpack_banner "stdin"
"${cpio_cmd[@]}"
else
local cpio=$(find_unpackable_file "$1")
unpack_banner "${cpio}"
"${cpio_cmd[@]}" <"${cpio}"
fi
}
# @FUNCTION: unpack_zip
# @USAGE: <zip file>
# @DESCRIPTION:
# Unpack zip archives.
# This function ignores all non-fatal errors (i.e. warnings).
# That is useful for zip archives with extra crap attached
# (e.g. self-extracting archives).
unpack_zip() {
[[ $# -eq 1 ]] || die "Usage: ${FUNCNAME} <file>"
local zip=$(find_unpackable_file "$1")
unpack_banner "${zip}"
unzip -qo "${zip}"
[[ $? -le 1 ]] || die "unpacking ${zip} failed (arch=unpack_zip)"
}
# @FUNCTION: _unpacker
# @USAGE: <one archive to unpack>
# @INTERNAL
# @DESCRIPTION:
# Unpack the specified archive. We only operate on one archive here
# to keep down on the looping logic (that is handled by `unpacker`).
_unpacker() {
[[ $# -eq 1 ]] || die "Usage: ${FUNCNAME} <file>"
local a=$1
local m=$(echo "${a}" | tr '[:upper:]' '[:lower:]')
a=$(find_unpackable_file "${a}")
# first figure out the decompression method
local comp=""
case ${m} in
*.bz2|*.tbz|*.tbz2)
local bzcmd=${PORTAGE_BZIP2_COMMAND:-$(type -P pbzip2 || type -P bzip2)}
local bzuncmd=${PORTAGE_BUNZIP2_COMMAND:-${bzcmd} -d}
: ${UNPACKER_BZ2:=${bzuncmd}}
comp="${UNPACKER_BZ2} -c"
;;
*.z|*.gz|*.tgz)
comp="gzip -dc" ;;
*.lzma|*.xz|*.txz)
comp="xz -dc" ;;
*.lz)
: ${UNPACKER_LZIP:=$(type -P plzip || type -P pdlzip || type -P lzip)}
comp="${UNPACKER_LZIP} -dc" ;;
*.zst)
comp="zstd -dfc" ;;
esac
# then figure out if there are any archiving aspects
local arch=""
case ${m} in
*.tgz|*.tbz|*.tbz2|*.txz|*.tar.*|*.tar)
arch="tar --no-same-owner -xof" ;;
*.cpio.*|*.cpio)
arch="unpack_cpio" ;;
*.deb)
arch="unpack_deb" ;;
*.run)
arch="unpack_makeself" ;;
*.sh)
# Not all shell scripts are makeself
if head -n 30 "${a}" | grep -qs '#.*Makeself' ; then
arch="unpack_makeself"
fi
;;
*.bin)
# Makeself archives can be annoyingly named
if head -c 100 "${a}" | grep -qs '#.*Makeself' ; then
arch="unpack_makeself"
fi
;;
*.zip)
arch="unpack_zip" ;;
esac
# finally do the unpack
if [[ -z ${arch}${comp} ]] ; then
unpack "$1"
return $?
fi
[[ ${arch} != unpack_* ]] && unpack_banner "${a}"
if [[ -z ${arch} ]] ; then
# Need to decompress the file into $PWD #408801
local _a=${a%.*}
${comp} "${a}" > "${_a##*/}"
elif [[ -z ${comp} ]] ; then
${arch} "${a}"
else
${comp} "${a}" | ${arch} -
fi
assert "unpacking ${a} failed (comp=${comp} arch=${arch})"
}
# @FUNCTION: unpacker
# @USAGE: [archives to unpack]
# @DESCRIPTION:
# This works in the same way that `unpack` does. If you don't specify
# any files, it will default to ${A}.
unpacker() {
local a
[[ $# -eq 0 ]] && set -- ${A}
for a ; do _unpacker "${a}" ; done
}
# @FUNCTION: unpacker_src_unpack
# @DESCRIPTION:
# Run `unpacker` to unpack all our stuff.
unpacker_src_unpack() {
unpacker
}
# @FUNCTION: unpacker_src_uri_depends
# @USAGE: [archives that we will unpack]
# @RETURN: Dependencies needed to unpack all the archives
# @DESCRIPTION:
# Walk all the specified files (defaults to $SRC_URI) and figure out the
# dependencies that are needed to unpack things.
#
# Note: USE flags are not yet handled.
unpacker_src_uri_depends() {
local uri deps d
if [[ $# -eq 0 ]] ; then
# Disable path expansion for USE conditionals. #654960
set -f
set -- ${SRC_URI}
set +f
fi
for uri in "$@" ; do
case ${uri} in
*.cpio.*|*.cpio)
d="app-arch/cpio" ;;
*.deb)
# platforms like AIX don't have a good ar
d="kernel_AIX? ( app-arch/deb2targz )" ;;
*.rar|*.RAR)
d="app-arch/unrar" ;;
*.7z)
d="app-arch/p7zip" ;;
*.xz)
d="app-arch/xz-utils" ;;
*.zip)
d="app-arch/unzip" ;;
*.lz)
d="|| ( app-arch/plzip app-arch/pdlzip app-arch/lzip )" ;;
*.zst)
d="app-arch/zstd" ;;
esac
deps+=" ${d}"
done
echo "${deps}"
}
EXPORT_FUNCTIONS src_unpack
fi