gentoo-x86/eclass/eutils.eclass

# Copyright 1999-2012 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: /var/cvsroot/gentoo-x86/eclass/eutils.eclass,v 1.405 2012/09/28 15:18:04 ulm Exp $

# @ECLASS: eutils.eclass
# @MAINTAINER:
# base-system@gentoo.org
# @BLURB: many extra (but common) functions that are used in ebuilds
# @DESCRIPTION:
# The eutils eclass contains a suite of functions that complement
# the ones that ebuild.sh already contain.  The idea is that the functions
# are not required in all ebuilds but enough utilize them to have a common
# home rather than having multiple ebuilds implementing the same thing.
#
# Due to the nature of this eclass, some functions may have maintainers
# different from the overall eclass!

if [[ ${___ECLASS_ONCE_EUTILS} != "recur -_+^+_- spank" ]] ; then
___ECLASS_ONCE_EUTILS="recur -_+^+_- spank"

inherit multilib toolchain-funcs user

if has "${EAPI:-0}" 0 1 2; then

# @FUNCTION: epause
# @USAGE: [seconds]
# @DESCRIPTION:
# Sleep for the specified number of seconds (default of 5 seconds).  Useful when
# printing a message the user should probably be reading and often used in
# conjunction with the ebeep function.  If the EPAUSE_IGNORE env var is set,
# don't wait at all. Defined in EAPIs 0 1 and 2.
epause() {
        [[ -z ${EPAUSE_IGNORE} ]] && sleep ${1:-5}
}

# @FUNCTION: ebeep
# @USAGE: [number of beeps]
# @DESCRIPTION:
# Issue the specified number of beeps (default of 5 beeps).  Useful when
# printing a message the user should probably be reading and often used in
# conjunction with the epause function.  If the EBEEP_IGNORE env var is set,
# don't beep at all. Defined in EAPIs 0 1 and 2.
ebeep() {
        local n
        if [[ -z ${EBEEP_IGNORE} ]] ; then
                for ((n=1 ; n <= ${1:-5} ; n++)) ; do
                        echo -ne "\a"
                        sleep 0.1 &>/dev/null ; sleep 0,1 &>/dev/null
                        echo -ne "\a"
                        sleep 1
                done
        fi
}

else

ebeep() {
        ewarn "QA Notice: ebeep is not defined in EAPI=${EAPI}, please file a bug at http://bugs.gentoo.org"
}

epause() {
        ewarn "QA Notice: epause is not defined in EAPI=${EAPI}, please file a bug at http://bugs.gentoo.org"
}

fi

# @FUNCTION: eqawarn
# @USAGE: [message]
# @DESCRIPTION:
# Proxy to ewarn for package managers that don't provide eqawarn and use the PM
# implementation if available. Reuses PORTAGE_ELOG_CLASSES as set by the dev
# profile.
if ! declare -F eqawarn >/dev/null ; then
        eqawarn() {
                has qa ${PORTAGE_ELOG_CLASSES} && ewarn "$@"
                :
        }
fi

# @FUNCTION: ecvs_clean
# @USAGE: [list of dirs]
# @DESCRIPTION:
# Remove CVS directories recursiveley.  Useful when a source tarball contains
# internal CVS directories.  Defaults to $PWD.
ecvs_clean() {
        [[ -z $* ]] && set -- .
        find "$@" -type d -name 'CVS' -prune -print0 | xargs -0 rm -rf
        find "$@" -type f -name '.cvs*' -print0 | xargs -0 rm -rf
}

# @FUNCTION: esvn_clean
# @USAGE: [list of dirs]
# @DESCRIPTION:
# Remove .svn directories recursiveley.  Useful when a source tarball contains
# internal Subversion directories.  Defaults to $PWD.
esvn_clean() {
        [[ -z $* ]] && set -- .
        find "$@" -type d -name '.svn' -prune -print0 | xargs -0 rm -rf
}

# @FUNCTION: estack_push
# @USAGE: <stack> [items to push]
# @DESCRIPTION:
# Push any number of items onto the specified stack.  Pick a name that
# is a valid variable (i.e. stick to alphanumerics), and push as many
# items as you like onto the stack at once.
#
# The following code snippet will echo 5, then 4, then 3, then ...
# @CODE
#               estack_push mystack 1 2 3 4 5
#               while estack_pop mystack i ; do
#                       echo "${i}"
#               done
# @CODE
estack_push() {
        [[ $# -eq 0 ]] && die "estack_push: incorrect # of arguments"
        local stack_name="__ESTACK_$1__" ; shift
        eval ${stack_name}+=\( \"\$@\" \)
}

# @FUNCTION: estack_pop
# @USAGE: <stack> [variable]
# @DESCRIPTION:
# Pop a single item off the specified stack.  If a variable is specified,
# the popped item is stored there.  If no more items are available, return
# 1, else return 0.  See estack_push for more info.
estack_pop() {
        [[ $# -eq 0 || $# -gt 2 ]] && die "estack_pop: incorrect # of arguments"

        # We use the fugly __estack_xxx var names to avoid collision with
        # passing back the return value.  If we used "local i" and the
        # caller ran `estack_pop ... i`, we'd end up setting the local
        # copy of "i" rather than the caller's copy.  The __estack_xxx
        # garbage is preferable to using $1/$2 everywhere as that is a
        # bit harder to read.
        local __estack_name="__ESTACK_$1__" ; shift
        local __estack_retvar=$1 ; shift
        eval local __estack_i=\${#${__estack_name}\[@\]}
        # Don't warn -- let the caller interpret this as a failure
        # or as normal behavior (akin to `shift`)
        [[ $(( --__estack_i )) -eq -1 ]] && return 1

        if [[ -n ${__estack_retvar} ]] ; then
                eval ${__estack_retvar}=\"\${${__estack_name}\[${__estack_i}\]}\"
        fi
        eval unset ${__estack_name}\[${__estack_i}\]
}

# @FUNCTION: eshopts_push
# @USAGE: [options to `set` or `shopt`]
# @DESCRIPTION:
# Often times code will want to enable a shell option to change code behavior.
# Since changing shell options can easily break other pieces of code (which
# assume the default state), eshopts_push is used to (1) push the current shell
# options onto a stack and (2) pass the specified arguments to set.
#
# If the first argument is '-s' or '-u', we assume you want to call `shopt`
# rather than `set` as there are some options only available via that.
#
# A common example is to disable shell globbing so that special meaning/care
# may be used with variables/arguments to custom functions.  That would be:
# @CODE
#               eshopts_push -s noglob
#               for x in ${foo} ; do
#                       if ...some check... ; then
#                               eshopts_pop
#                               return 0
#                       fi
#               done
#               eshopts_pop
# @CODE
eshopts_push() {
        if [[ $1 == -[su] ]] ; then
                estack_push eshopts "$(shopt -p)"
                [[ $# -eq 0 ]] && return 0
                shopt "$@" || die "${FUNCNAME}: bad options to shopt: $*"
        else
                estack_push eshopts $-
                [[ $# -eq 0 ]] && return 0
                set "$@" || die "${FUNCNAME}: bad options to set: $*"
        fi
}

# @FUNCTION: eshopts_pop
# @USAGE:
# @DESCRIPTION:
# Restore the shell options to the state saved with the corresponding
# eshopts_push call.  See that function for more details.
eshopts_pop() {
        local s
        estack_pop eshopts s || die "${FUNCNAME}: unbalanced push"
        if [[ ${s} == "shopt -"* ]] ; then
                eval "${s}" || die "${FUNCNAME}: sanity: invalid shopt options: ${s}"
        else
                set +$-     || die "${FUNCNAME}: sanity: invalid shell settings: $-"
                set -${s}   || die "${FUNCNAME}: sanity: unable to restore saved shell settings: ${s}"
        fi
}

# @FUNCTION: eumask_push
# @USAGE: <new umask>
# @DESCRIPTION:
# Set the umask to the new value specified while saving the previous
# value onto a stack.  Useful for temporarily changing the umask.
eumask_push() {
        estack_push eumask "$(umask)"
        umask "$@" || die "${FUNCNAME}: bad options to umask: $*"
}

# @FUNCTION: eumask_pop
# @USAGE:
# @DESCRIPTION:
# Restore the previous umask state.
eumask_pop() {
        [[ $# -eq 0 ]] || die "${FUNCNAME}: we take no options"
        local s
        estack_pop eumask s || die "${FUNCNAME}: unbalanced push"
        umask ${s} || die "${FUNCNAME}: sanity: could not restore umask: ${s}"
}

# @VARIABLE: EPATCH_SOURCE
# @DESCRIPTION:
# Default directory to search for patches.
EPATCH_SOURCE="${WORKDIR}/patch"
# @VARIABLE: EPATCH_SUFFIX
# @DESCRIPTION:
# Default extension for patches (do not prefix the period yourself).
EPATCH_SUFFIX="patch.bz2"
# @VARIABLE: EPATCH_OPTS
# @DESCRIPTION:
# Options to pass to patch.  Meant for ebuild/package-specific tweaking
# such as forcing the patch level (-p#) or fuzz (-F#) factor.  Note that
# for single patch tweaking, you can also pass flags directly to epatch.
EPATCH_OPTS=""
# @VARIABLE: EPATCH_COMMON_OPTS
# @DESCRIPTION:
# Common options to pass to `patch`.  You probably should never need to
# change these.  If you do, please discuss it with base-system first to
# be sure.
# @CODE
#       -g0 - keep RCS, ClearCase, Perforce and SCCS happy #24571
#       --no-backup-if-mismatch - do not leave .orig files behind
#       -E - automatically remove empty files
# @CODE
EPATCH_COMMON_OPTS="-g0 -E --no-backup-if-mismatch"
# @VARIABLE: EPATCH_EXCLUDE
# @DESCRIPTION:
# List of patches not to apply.  Note this is only file names,
# and not the full path.  Globs accepted.
EPATCH_EXCLUDE=""
# @VARIABLE: EPATCH_SINGLE_MSG
# @DESCRIPTION:
# Change the printed message for a single patch.
EPATCH_SINGLE_MSG=""
# @VARIABLE: EPATCH_MULTI_MSG
# @DESCRIPTION:
# Change the printed message for multiple patches.
EPATCH_MULTI_MSG="Applying various patches (bugfixes/updates) ..."
# @VARIABLE: EPATCH_FORCE
# @DESCRIPTION:
# Only require patches to match EPATCH_SUFFIX rather than the extended
# arch naming style.
EPATCH_FORCE="no"

# @FUNCTION: epatch
# @USAGE: [options] [patches] [dirs of patches]
# @DESCRIPTION:
# epatch is designed to greatly simplify the application of patches.  It can
# process patch files directly, or directories of patches.  The patches may be
# compressed (bzip/gzip/etc...) or plain text.  You generally need not specify
# the -p option as epatch will automatically attempt -p0 to -p5 until things
# apply successfully.
#
# If you do not specify any patches/dirs, then epatch will default to the
# directory specified by EPATCH_SOURCE.
#
# Any options specified that start with a dash will be passed down to patch
# for this specific invocation.  As soon as an arg w/out a dash is found, then
# arg processing stops.
#
# When processing directories, epatch will apply all patches that match:
# @CODE
#       if ${EPATCH_FORCE} != "yes"
#               ??_${ARCH}_foo.${EPATCH_SUFFIX}
#       else
#               *.${EPATCH_SUFFIX}
# @CODE
# The leading ?? are typically numbers used to force consistent patch ordering.
# The arch field is used to apply patches only for the host architecture with
# the special value of "all" means apply for everyone.  Note that using values
# other than "all" is highly discouraged -- you should apply patches all the
# time and let architecture details be detected at configure/compile time.
#
# If EPATCH_SUFFIX is empty, then no period before it is implied when searching
# for patches to apply.
#
# Refer to the other EPATCH_xxx variables for more customization of behavior.
epatch() {
        _epatch_draw_line() {
                # create a line of same length as input string
                [[ -z $1 ]] && set "$(printf "%65s" '')"
                echo "${1//?/=}"
        }

        unset P4CONFIG P4PORT P4USER # keep perforce at bay #56402

        # First process options.  We localize the EPATCH_OPTS setting
        # from above so that we can pass it on in the loop below with
        # any additional values the user has specified.
        local EPATCH_OPTS=( ${EPATCH_OPTS[*]} )
        while [[ $# -gt 0 ]] ; do
                case $1 in
                -*) EPATCH_OPTS+=( "$1" ) ;;
                *) break ;;
                esac
                shift
        done

        # Let the rest of the code process one user arg at a time --
        # each arg may expand into multiple patches, and each arg may
        # need to start off with the default global EPATCH_xxx values
        if [[ $# -gt 1 ]] ; then
                local m
                for m in "$@" ; do
                        epatch "${m}"
                done
                return 0
        fi

        local SINGLE_PATCH="no"
        # no args means process ${EPATCH_SOURCE}
        [[ $# -eq 0 ]] && set -- "${EPATCH_SOURCE}"

        if [[ -f $1 ]] ; then
                SINGLE_PATCH="yes"
                set -- "$1"
                # Use the suffix from the single patch (localize it); the code
                # below will find the suffix for us
                local EPATCH_SUFFIX=$1

        elif [[ -d $1 ]] ; then
                # Some people like to make dirs of patches w/out suffixes (vim)
                set -- "$1"/*${EPATCH_SUFFIX:+."${EPATCH_SUFFIX}"}

        elif [[ -f ${EPATCH_SOURCE}/$1 ]] ; then
                # Re-use EPATCH_SOURCE as a search dir
                epatch "${EPATCH_SOURCE}/$1"
                return $?

        else
                # sanity check ... if it isn't a dir or file, wtf man ?
                [[ $# -ne 0 ]] && EPATCH_SOURCE=$1
                echo
                eerror "Cannot find \$EPATCH_SOURCE!  Value for \$EPATCH_SOURCE is:"
                eerror
                eerror "  ${EPATCH_SOURCE}"
                eerror "  ( ${EPATCH_SOURCE##*/} )"
                echo
                die "Cannot find \$EPATCH_SOURCE!"
        fi

        # Now that we know we're actually going to apply something, merge
        # all of the patch options back in to a single variable for below.
        EPATCH_OPTS="${EPATCH_COMMON_OPTS} ${EPATCH_OPTS[*]}"

        local PIPE_CMD
        case ${EPATCH_SUFFIX##*\.} in
                xz)      PIPE_CMD="xz -dc"    ;;
                lzma)    PIPE_CMD="lzma -dc"  ;;
                bz2)     PIPE_CMD="bzip2 -dc" ;;
                gz|Z|z)  PIPE_CMD="gzip -dc"  ;;
                ZIP|zip) PIPE_CMD="unzip -p"  ;;
                *)       ;;
        esac

        [[ ${SINGLE_PATCH} == "no" ]] && einfo "${EPATCH_MULTI_MSG}"

        local x
        for x in "$@" ; do
                # If the patch dir given contains subdirs, or our EPATCH_SUFFIX
                # didn't match anything, ignore continue on
                [[ ! -f ${x} ]] && continue

                local patchname=${x##*/}

                # Apply single patches, or forced sets of patches, or
                # patches with ARCH dependant names.
                #       ???_arch_foo.patch
                # Else, skip this input altogether
                local a=${patchname#*_} # strip the ???_
                a=${a%%_*}              # strip the _foo.patch
                if ! [[ ${SINGLE_PATCH} == "yes" || \
                                ${EPATCH_FORCE} == "yes" || \
                                ${a} == all     || \
                                ${a} == ${ARCH} ]]
                then
                        continue
                fi

                # Let people filter things dynamically
                if [[ -n ${EPATCH_EXCLUDE} ]] ; then
                        # let people use globs in the exclude
                        eshopts_push -o noglob

                        local ex
                        for ex in ${EPATCH_EXCLUDE} ; do
                                if [[ ${patchname} == ${ex} ]] ; then
                                        eshopts_pop
                                        continue 2
                                fi
                        done

                        eshopts_pop
                fi

                if [[ ${SINGLE_PATCH} == "yes" ]] ; then
                        if [[ -n ${EPATCH_SINGLE_MSG} ]] ; then
                                einfo "${EPATCH_SINGLE_MSG}"
                        else
                                einfo "Applying ${patchname} ..."
                        fi
                else
                        einfo "  ${patchname} ..."
                fi

                # most of the time, there will only be one run per unique name,
                # but if there are more, make sure we get unique log filenames
                local STDERR_TARGET="${T}/${patchname}.out"
                if [[ -e ${STDERR_TARGET} ]] ; then
                        STDERR_TARGET="${T}/${patchname}-$$.out"
                fi

                printf "***** %s *****\nPWD: %s\n\n" "${patchname}" "${PWD}" > "${STDERR_TARGET}"

                # Decompress the patch if need be
                local count=0
                local PATCH_TARGET
                if [[ -n ${PIPE_CMD} ]] ; then
                        PATCH_TARGET="${T}/$$.patch"
                        echo "PIPE_COMMAND:  ${PIPE_CMD} ${x} > ${PATCH_TARGET}" >> "${STDERR_TARGET}"

                        if ! (${PIPE_CMD} "${x}" > "${PATCH_TARGET}") >> "${STDERR_TARGET}" 2>&1 ; then
                                echo
                                eerror "Could not extract patch!"
                                #die "Could not extract patch!"
                                count=5
                                break
                        fi
                else
                        PATCH_TARGET=${x}
                fi

                # Check for absolute paths in patches.  If sandbox is disabled,
                # people could (accidently) patch files in the root filesystem.
                # Or trigger other unpleasantries #237667.  So disallow -p0 on
                # such patches.
                local abs_paths=$(egrep -n '^[-+]{3} /' "${PATCH_TARGET}" | awk '$2 != "/dev/null" { print }')
                if [[ -n ${abs_paths} ]] ; then
                        count=1
                        printf "NOTE: skipping -p0 due to absolute paths in patch:\n%s\n" "${abs_paths}" >> "${STDERR_TARGET}"
                fi
                # Similar reason, but with relative paths.
                local rel_paths=$(egrep -n '^[-+]{3} [^ ]*[.][.]/' "${PATCH_TARGET}")
                if [[ -n ${rel_paths} ]] ; then
                        eqawarn "QA Notice: Your patch uses relative paths '../'."
                        eqawarn " In the future this will cause a failure."
                        eqawarn "${rel_paths}"
                fi

                # Dynamically detect the correct -p# ... i'm lazy, so shoot me :/
                local patch_cmd
                while [[ ${count} -lt 5 ]] ; do
                        patch_cmd="${BASH_ALIASES[patch]:-patch} -p${count} ${EPATCH_OPTS}"

                        # Generate some useful debug info ...
                        (
                        _epatch_draw_line "***** ${patchname} *****"
                        echo
                        echo "PATCH COMMAND:  ${patch_cmd} < '${PATCH_TARGET}'"
                        echo
                        _epatch_draw_line "***** ${patchname} *****"
                        ${patch_cmd} --dry-run -f < "${PATCH_TARGET}" 2>&1
                        ret=$?
                        echo
                        echo "patch program exited with status ${ret}"
                        exit ${ret}
                        ) >> "${STDERR_TARGET}"

                        if [ $? -eq 0 ] ; then
                                (
                                _epatch_draw_line "***** ${patchname} *****"
                                echo
                                echo "ACTUALLY APPLYING ${patchname} ..."
                                echo
                                _epatch_draw_line "***** ${patchname} *****"
                                ${patch_cmd} < "${PATCH_TARGET}" 2>&1
                                ret=$?
                                echo
                                echo "patch program exited with status ${ret}"
                                exit ${ret}
                                ) >> "${STDERR_TARGET}"

                                if [ $? -ne 0 ] ; then
                                        echo
                                        eerror "A dry-run of patch command succeeded, but actually"
                                        eerror "applying the patch failed!"
                                        #die "Real world sux compared to the dreamworld!"
                                        count=5
                                fi
                                break
                        fi

                        : $(( count++ ))
                done

                # if we had to decompress the patch, delete the temp one
                if [[ -n ${PIPE_CMD} ]] ; then
                        rm -f "${PATCH_TARGET}"
                fi

                if [[ ${count} -ge 5 ]] ; then
                        echo
                        eerror "Failed Patch: ${patchname} !"
                        eerror " ( ${PATCH_TARGET} )"
                        eerror
                        eerror "Include in your bugreport the contents of:"
                        eerror
                        eerror "  ${STDERR_TARGET}"
                        echo
                        die "Failed Patch: ${patchname}!"
                fi

                # if everything worked, delete the full debug patch log
                rm -f "${STDERR_TARGET}"

                # then log away the exact stuff for people to review later
                cat <<-EOF >> "${T}/epatch.log"
                PATCH: ${x}
                CMD: ${patch_cmd}
                PWD: ${PWD}

                EOF
                eend 0
        done

        [[ ${SINGLE_PATCH} == "no" ]] && einfo "Done with patching"
        : # everything worked
}

# @FUNCTION: epatch_user
# @USAGE:
# @DESCRIPTION:
# Applies user-provided patches to the source tree. The patches are
# taken from /etc/portage/patches/<CATEGORY>/<PF|P|PN>[:SLOT]/, where the first
# of these three directories to exist will be the one to use, ignoring
# any more general directories which might exist as well. They must end
# in ".patch" to be applied.
#
# User patches are intended for quick testing of patches without ebuild
# modifications, as well as for permanent customizations a user might
# desire. Obviously, there can be no official support for arbitrarily
# patched ebuilds. So whenever a build log in a bug report mentions that
# user patches were applied, the user should be asked to reproduce the
# problem without these.
#
# Not all ebuilds do call this function, so placing patches in the
# stated directory might or might not work, depending on the package and
# the eclasses it inherits and uses. It is safe to call the function
# repeatedly, so it is always possible to add a call at the ebuild
# level. The first call is the time when the patches will be
# applied.
#
# Ideally, this function should be called after gentoo-specific patches
# have been applied, so that their code can be modified as well, but
# before calls to e.g. eautoreconf, as the user patches might affect
# autotool input files as well.
epatch_user() {
        [[ $# -ne 0 ]] && die "epatch_user takes no options"

        # Allow multiple calls to this function; ignore all but the first
        local applied="${T}/epatch_user.log"
        [[ -e ${applied} ]] && return 2

        # don't clobber any EPATCH vars that the parent might want
        local EPATCH_SOURCE check base=${PORTAGE_CONFIGROOT%/}/etc/portage/patches
        for check in ${CATEGORY}/{${P}-${PR},${P},${PN}}{,:${SLOT}}; do
                EPATCH_SOURCE=${base}/${CTARGET}/${check}
                [[ -r ${EPATCH_SOURCE} ]] || EPATCH_SOURCE=${base}/${CHOST}/${check}
                [[ -r ${EPATCH_SOURCE} ]] || EPATCH_SOURCE=${base}/${check}
                if [[ -d ${EPATCH_SOURCE} ]] ; then
                        EPATCH_SOURCE=${EPATCH_SOURCE} \
                        EPATCH_SUFFIX="patch" \
                        EPATCH_FORCE="yes" \
                        EPATCH_MULTI_MSG="Applying user patches from ${EPATCH_SOURCE} ..." \
                        epatch
                        echo "${EPATCH_SOURCE}" > "${applied}"
                        return 0
                fi
        done
        echo "none" > "${applied}"
        return 1
}

# @FUNCTION: emktemp
# @USAGE: [temp dir]
# @DESCRIPTION:
# Cheap replacement for when debianutils (and thus mktemp)
# does not exist on the users system.
emktemp() {
        local exe="touch"
        [[ $1 == -d ]] && exe="mkdir" && shift
        local topdir=$1

        if [[ -z ${topdir} ]] ; then
                [[ -z ${T} ]] \
                        && topdir="/tmp" \
                        || topdir=${T}
        fi

        if ! type -P mktemp > /dev/null ; then
                # system lacks `mktemp` so we have to fake it
                local tmp=/
                while [[ -e ${tmp} ]] ; do
                        tmp=${topdir}/tmp.${RANDOM}.${RANDOM}.${RANDOM}
                done
                ${exe} "${tmp}" || ${exe} -p "${tmp}"
                echo "${tmp}"
        else
                # the args here will give slightly wierd names on BSD,
                # but should produce a usable file on all userlands
                if [[ ${exe} == "touch" ]] ; then
                        TMPDIR="${topdir}" mktemp -t tmp.XXXXXXXXXX
                else
                        TMPDIR="${topdir}" mktemp -dt tmp.XXXXXXXXXX
                fi
        fi
}

# @FUNCTION: edos2unix
# @USAGE: <file> [more files ...]
# @DESCRIPTION:
# A handy replacement for dos2unix, recode, fixdos, etc...  This allows you
# to remove all of these text utilities from DEPEND variables because this
# is a script based solution.  Just give it a list of files to convert and
# they will all be changed from the DOS CRLF format to the UNIX LF format.
edos2unix() {
        [[ $# -eq 0 ]] && return 0
        sed -i 's/\r$//' -- "$@" || die
}

# @FUNCTION: make_desktop_entry
# @USAGE: make_desktop_entry(<command>, [name], [icon], [type], [fields])
# @DESCRIPTION:
# Make a .desktop file.
#
# @CODE
# binary:   what command does the app run with ?
# name:     the name that will show up in the menu
# icon:     the icon to use in the menu entry
#           this can be relative (to /usr/share/pixmaps) or
#           a full path to an icon
# type:     what kind of application is this?
#           for categories:
#           http://standards.freedesktop.org/menu-spec/latest/apa.html
#           if unset, function tries to guess from package's category
# fields:       extra fields to append to the desktop file; a printf string
# @CODE
make_desktop_entry() {
        [[ -z $1 ]] && die "make_desktop_entry: You must specify the executable"

        local exec=${1}
        local name=${2:-${PN}}
        local icon=${3:-${PN}}
        local type=${4}
        local fields=${5}

        if [[ -z ${type} ]] ; then
                local catmaj=${CATEGORY%%-*}
                local catmin=${CATEGORY##*-}
                case ${catmaj} in
                        app)
                                case ${catmin} in
                                        accessibility) type="Utility;Accessibility";;
                                        admin)         type=System;;
                                        antivirus)     type=System;;
                                        arch)          type="Utility;Archiving";;
                                        backup)        type="Utility;Archiving";;
                                        cdr)           type="AudioVideo;DiscBurning";;
                                        dicts)         type="Office;Dictionary";;
                                        doc)           type=Documentation;;
                                        editors)       type="Utility;TextEditor";;
                                        emacs)         type="Development;TextEditor";;
                                        emulation)     type="System;Emulator";;
                                        laptop)        type="Settings;HardwareSettings";;
                                        office)        type=Office;;
                                        pda)           type="Office;PDA";;
                                        vim)           type="Development;TextEditor";;
                                        xemacs)        type="Development;TextEditor";;
                                esac
                                ;;

                        dev)
                                type="Development"
                                ;;

                        games)
                                case ${catmin} in
                                        action|fps) type=ActionGame;;
                                        arcade)     type=ArcadeGame;;
                                        board)      type=BoardGame;;
                                        emulation)  type=Emulator;;
                                        kids)       type=KidsGame;;
                                        puzzle)     type=LogicGame;;
                                        roguelike)  type=RolePlaying;;
                                        rpg)        type=RolePlaying;;
                                        simulation) type=Simulation;;
                                        sports)     type=SportsGame;;
                                        strategy)   type=StrategyGame;;
                                esac
                                type="Game;${type}"
                                ;;

                        gnome)
                                type="Gnome;GTK"
                                ;;

                        kde)
                                type="KDE;Qt"
                                ;;

                        mail)
                                type="Network;Email"
                                ;;

                        media)
                                case ${catmin} in
                                        gfx)
                                                type=Graphics
                                                ;;
                                        *)
                                                case ${catmin} in
                                                        radio) type=Tuner;;
                                                        sound) type=Audio;;
                                                        tv)    type=TV;;
                                                        video) type=Video;;
                                                esac
                                                type="AudioVideo;${type}"
                                                ;;
                                esac
                                ;;

                        net)
                                case ${catmin} in
                                        dialup) type=Dialup;;
                                        ftp)    type=FileTransfer;;
                                        im)     type=InstantMessaging;;
                                        irc)    type=IRCClient;;
                                        mail)   type=Email;;
                                        news)   type=News;;
                                        nntp)   type=News;;
                                        p2p)    type=FileTransfer;;
                                        voip)   type=Telephony;;
                                esac
                                type="Network;${type}"
                                ;;

                        sci)
                                case ${catmin} in
                                        astro*)  type=Astronomy;;
                                        bio*)    type=Biology;;
                                        calc*)   type=Calculator;;
                                        chem*)   type=Chemistry;;
                                        elec*)   type=Electronics;;
                                        geo*)    type=Geology;;
                                        math*)   type=Math;;
                                        physics) type=Physics;;
                                        visual*) type=DataVisualization;;
                                esac
                                type="Education;Science;${type}"
                                ;;

                        sys)
                                type="System"
                                ;;

                        www)
                                case ${catmin} in
                                        client) type=WebBrowser;;
                                esac
                                type="Network;${type}"
                                ;;

                        *)
                                type=
                                ;;
                esac
        fi
        if [ "${SLOT}" == "0" ] ; then
                local desktop_name="${PN}"
        else
                local desktop_name="${PN}-${SLOT}"
        fi
        local desktop="${T}/$(echo ${exec} | sed 's:[[:space:]/:]:_:g')-${desktop_name}.desktop"
        #local desktop=${T}/${exec%% *:-${desktop_name}}.desktop

        # Don't append another ";" when a valid category value is provided.
        type=${type%;}${type:+;}

        eshopts_push -s extglob
        if [[ -n ${icon} && ${icon} != /* ]] && [[ ${icon} == *.xpm || ${icon} == *.png || ${icon} == *.svg ]]; then
                ewarn "As described in the Icon Theme Specification, icon file extensions are not"
                ewarn "allowed in .desktop files if the value is not an absolute path."
                icon=${icon%.@(xpm|png|svg)}
        fi
        eshopts_pop

        cat <<-EOF > "${desktop}"
        [Desktop Entry]
        Name=${name}
        Type=Application
        Comment=${DESCRIPTION}
        Exec=${exec}
        TryExec=${exec%% *}
        Icon=${icon}
        Categories=${type}
        EOF

        if [[ ${fields:-=} != *=* ]] ; then
                # 5th arg used to be value to Path=
                ewarn "make_desktop_entry: update your 5th arg to read Path=${fields}"
                fields="Path=${fields}"
        fi
        [[ -n ${fields} ]] && printf '%b\n' "${fields}" >> "${desktop}"

        (
                # wrap the env here so that the 'insinto' call
                # doesn't corrupt the env of the caller
                insinto /usr/share/applications
                doins "${desktop}"
        ) || die "installing desktop file failed"
}

# @FUNCTION: validate_desktop_entries
# @USAGE: [directories]
# @MAINTAINER:
# Carsten Lohrke <carlo@gentoo.org>
# @DESCRIPTION:
# Validate desktop entries using desktop-file-utils
validate_desktop_entries() {
        if [[ -x /usr/bin/desktop-file-validate ]] ; then
                einfo "Checking desktop entry validity"
                local directories=""
                for d in /usr/share/applications $@ ; do
                        [[ -d ${D}${d} ]] && directories="${directories} ${D}${d}"
                done
                if [[ -n ${directories} ]] ; then
                        for FILE in $(find ${directories} -name "*\.desktop" \
                                                        -not -path '*.hidden*' | sort -u 2>/dev/null)
                        do
                                local temp=$(desktop-file-validate ${FILE} | grep -v "warning:" | \
                                                                sed -e "s|error: ||" -e "s|${FILE}:|--|g" )
                                [[ -n $temp ]] && elog ${temp/--/${FILE/${D}/}:}
                        done
                fi
                echo ""
        else
                einfo "Passing desktop entry validity check. Install dev-util/desktop-file-utils, if you want to help to improve Gentoo."
        fi
}

# @FUNCTION: make_session_desktop
# @USAGE: <title> <command> [command args...]
# @DESCRIPTION:
# Make a GDM/KDM Session file.  The title is the file to execute to start the
# Window Manager.  The command is the name of the Window Manager.
#
# You can set the name of the file via the ${wm} variable.
make_session_desktop() {
        [[ -z $1 ]] && eerror "$0: You must specify the title" && return 1
        [[ -z $2 ]] && eerror "$0: You must specify the command" && return 1

        local title=$1
        local command=$2
        local desktop=${T}/${wm:-${PN}}.desktop
        shift 2

        cat <<-EOF > "${desktop}"
        [Desktop Entry]
        Name=${title}
        Comment=This session logs you into ${title}
        Exec=${command} $*
        TryExec=${command}
        Type=XSession
        EOF

        (
        # wrap the env here so that the 'insinto' call
        # doesn't corrupt the env of the caller
        insinto /usr/share/xsessions
        doins "${desktop}"
        )
}

# @FUNCTION: domenu
# @USAGE: <menus>
# @DESCRIPTION:
# Install the list of .desktop menu files into the appropriate directory
# (/usr/share/applications).
domenu() {
        (
        # wrap the env here so that the 'insinto' call
        # doesn't corrupt the env of the caller
        local i j ret=0
        insinto /usr/share/applications
        for i in "$@" ; do
                if [[ -f ${i} ]] ; then
                        doins "${i}"
                        ((ret+=$?))
                elif [[ -d ${i} ]] ; then
                        for j in "${i}"/*.desktop ; do
                                doins "${j}"
                                ((ret+=$?))
                        done
                else
                        ((++ret))
                fi
        done
        exit ${ret}
        )
}

# @FUNCTION: newmenu
# @USAGE: <menu> <newname>
# @DESCRIPTION:
# Like all other new* functions, install the specified menu as newname.
newmenu() {
        (
        # wrap the env here so that the 'insinto' call
        # doesn't corrupt the env of the caller
        insinto /usr/share/applications
        newins "$@"
        )
}

# @FUNCTION: _iconins
# @INTERNAL
# @DESCRIPTION:
# function for use in doicon and newicon
_iconins() {
        (
        # wrap the env here so that the 'insinto' call
        # doesn't corrupt the env of the caller
        local funcname=$1; shift
        local size dir
        local context=apps
        local theme=hicolor

        while [[ $# -gt 0 ]] ; do
                case $1 in
                -s|--size)
                        if [[ ${2%%x*}x${2%%x*} == "$2" ]] ; then
                                size=${2%%x*}
                        else
                                size=${2}
                        fi
                        case ${size} in
                        16|22|24|32|36|48|64|72|96|128|192|256)
                                size=${size}x${size};;
                        scalable)
                                ;;
                        *)
                                eerror "${size} is an unsupported icon size!"
                                exit 1;;
                        esac
                        shift 2;;
                -t|--theme)
                        theme=${2}
                        shift 2;;
                -c|--context)
                        context=${2}
                        shift 2;;
                *)
                        if [[ -z ${size} ]] ; then
                                insinto /usr/share/pixmaps
                        else
                                insinto /usr/share/icons/${theme}/${size}/${context}
                        fi

                        if [[ ${funcname} == doicon ]] ; then
                                if [[ -f $1 ]] ; then
                                        doins "${1}"
                                elif [[ -d $1 ]] ; then
                                        shopt -s nullglob
                                        doins "${1}"/*.{png,svg}
                                        shopt -u nullglob
                                else
                                        eerror "${1} is not a valid file/directory!"
                                        exit 1
                                fi
                        else
                                break
                        fi
                        shift 1;;
                esac
        done
        if [[ ${funcname} == newicon ]] ; then
                newins "$@"
        fi
        ) || die
}

# @FUNCTION: doicon
# @USAGE: [options] <icons>
# @DESCRIPTION:
# Install icon into the icon directory /usr/share/icons or into
# /usr/share/pixmaps if "--size" is not set.
# This is useful in conjunction with creating desktop/menu files.
#
# @CODE
#  options:
#  -s, --size
#    !!! must specify to install into /usr/share/icons/... !!!
#    size of the icon, like 48 or 48x48
#    supported icon sizes are:
#    16 22 24 32 36 48 64 72 96 128 192 256 scalable
#  -c, --context
#    defaults to "apps"
#  -t, --theme
#    defaults to "hicolor"
#
# icons: list of icons
#
# example 1: doicon foobar.png fuqbar.svg suckbar.png
# results in: insinto /usr/share/pixmaps
#             doins foobar.png fuqbar.svg suckbar.png
#
# example 2: doicon -s 48 foobar.png fuqbar.png blobbar.png
# results in: insinto /usr/share/icons/hicolor/48x48/apps
#             doins foobar.png fuqbar.png blobbar.png
# @CODE
doicon() {
        _iconins ${FUNCNAME} "$@"
}

# @FUNCTION: newicon
# @USAGE: [options] <icon> <newname>
# @DESCRIPTION:
# Like doicon, install the specified icon as newname.
#
# @CODE
# example 1: newicon foobar.png NEWNAME.png
# results in: insinto /usr/share/pixmaps
#             newins foobar.png NEWNAME.png
#
# example 2: newicon -s 48 foobar.png NEWNAME.png 
# results in: insinto /usr/share/icons/hicolor/48x48/apps
#             newins foobar.png NEWNAME.png
# @CODE
newicon() {
        _iconins ${FUNCNAME} "$@"
}

# @FUNCTION: strip-linguas
# @USAGE: [<allow LINGUAS>|<-i|-u> <directories of .po files>]
# @DESCRIPTION:
# Make sure that LINGUAS only contains languages that
# a package can support.  The first form allows you to
# specify a list of LINGUAS.  The -i builds a list of po
# files found in all the directories and uses the
# intersection of the lists.  The -u builds a list of po
# files found in all the directories and uses the union
# of the lists.
strip-linguas() {
        local ls newls nols
        if [[ $1 == "-i" ]] || [[ $1 == "-u" ]] ; then
                local op=$1; shift
                ls=$(find "$1" -name '*.po' -exec basename {} .po ';'); shift
                local d f
                for d in "$@" ; do
                        if [[ ${op} == "-u" ]] ; then
                                newls=${ls}
                        else
                                newls=""
                        fi
                        for f in $(find "$d" -name '*.po' -exec basename {} .po ';') ; do
                                if [[ ${op} == "-i" ]] ; then
                                        has ${f} ${ls} && newls="${newls} ${f}"
                                else
                                        has ${f} ${ls} || newls="${newls} ${f}"
                                fi
                        done
                        ls=${newls}
                done
        else
                ls="$@"
        fi

        nols=""
        newls=""
        for f in ${LINGUAS} ; do
                if has ${f} ${ls} ; then
                        newls="${newls} ${f}"
                else
                        nols="${nols} ${f}"
                fi
        done
        [[ -n ${nols} ]] \
                && einfo "Sorry, but ${PN} does not support the LINGUAS:" ${nols}
        export LINGUAS=${newls:1}
}

# @FUNCTION: preserve_old_lib
# @USAGE: <libs to preserve> [more libs]
# @DESCRIPTION:
# These functions are useful when a lib in your package changes ABI SONAME.
# An example might be from libogg.so.0 to libogg.so.1.  Removing libogg.so.0
# would break packages that link against it.  Most people get around this
# by using the portage SLOT mechanism, but that is not always a relevant
# solution, so instead you can call this from pkg_preinst.  See also the
# preserve_old_lib_notify function.
preserve_old_lib() {
        if [[ ${EBUILD_PHASE} != "preinst" ]] ; then
                eerror "preserve_old_lib() must be called from pkg_preinst() only"
                die "Invalid preserve_old_lib() usage"
        fi
        [[ -z $1 ]] && die "Usage: preserve_old_lib <library to preserve> [more libraries to preserve]"

        # let portage worry about it
        has preserve-libs ${FEATURES} && return 0

        local lib dir
        for lib in "$@" ; do
                [[ -e ${ROOT}/${lib} ]] || continue
                dir=${lib%/*}
                dodir ${dir} || die "dodir ${dir} failed"
                cp "${ROOT}"/${lib} "${D}"/${lib} || die "cp ${lib} failed"
                touch "${D}"/${lib}
        done
}

# @FUNCTION: preserve_old_lib_notify
# @USAGE: <libs to notify> [more libs]
# @DESCRIPTION:
# Spit helpful messages about the libraries preserved by preserve_old_lib.
preserve_old_lib_notify() {
        if [[ ${EBUILD_PHASE} != "postinst" ]] ; then
                eerror "preserve_old_lib_notify() must be called from pkg_postinst() only"
                die "Invalid preserve_old_lib_notify() usage"
        fi

        # let portage worry about it
        has preserve-libs ${FEATURES} && return 0

        local lib notice=0
        for lib in "$@" ; do
                [[ -e ${ROOT}/${lib} ]] || continue
                if [[ ${notice} -eq 0 ]] ; then
                        notice=1
                        ewarn "Old versions of installed libraries were detected on your system."
                        ewarn "In order to avoid breaking packages that depend on these old libs,"
                        ewarn "the libraries are not being removed.  You need to run revdep-rebuild"
                        ewarn "in order to remove these old dependencies.  If you do not have this"
                        ewarn "helper program, simply emerge the 'gentoolkit' package."
                        ewarn
                fi
                ewarn "  # revdep-rebuild --library '${lib}' && rm '${lib}'"
        done
}

# @FUNCTION: built_with_use
# @USAGE: [--hidden] [--missing <action>] [-a|-o] <DEPEND ATOM> <List of USE flags>
# @DESCRIPTION:
#
# Deprecated: Use EAPI 2 use deps in DEPEND|RDEPEND and with has_version calls.
#
# A temporary hack until portage properly supports DEPENDing on USE
# flags being enabled in packages.  This will check to see if the specified
# DEPEND atom was built with the specified list of USE flags.  The
# --missing option controls the behavior if called on a package that does
# not actually support the defined USE flags (aka listed in IUSE).
# The default is to abort (call die).  The -a and -o flags control
# the requirements of the USE flags.  They correspond to "and" and "or"
# logic.  So the -a flag means all listed USE flags must be enabled
# while the -o flag means at least one of the listed IUSE flags must be
# enabled.  The --hidden option is really for internal use only as it
# means the USE flag we're checking is hidden expanded, so it won't be found
# in IUSE like normal USE flags.
#
# Remember that this function isn't terribly intelligent so order of optional
# flags matter.
built_with_use() {
        local hidden="no"
        if [[ $1 == "--hidden" ]] ; then
                hidden="yes"
                shift
        fi

        local missing_action="die"
        if [[ $1 == "--missing" ]] ; then
                missing_action=$2
                shift ; shift
                case ${missing_action} in
                        true|false|die) ;;
                        *) die "unknown action '${missing_action}'";;
                esac
        fi

        local opt=$1
        [[ ${opt:0:1} = "-" ]] && shift || opt="-a"

        local PKG=$(best_version $1)
        [[ -z ${PKG} ]] && die "Unable to resolve $1 to an installed package"
        shift

        local USEFILE=${ROOT}/var/db/pkg/${PKG}/USE
        local IUSEFILE=${ROOT}/var/db/pkg/${PKG}/IUSE

        # if the IUSE file doesn't exist, the read will error out, we need to handle
        # this gracefully
        if [[ ! -e ${USEFILE} ]] || [[ ! -e ${IUSEFILE} && ${hidden} == "no" ]] ; then
                case ${missing_action} in
                        true)   return 0;;
                        false)  return 1;;
                        die)    die "Unable to determine what USE flags $PKG was built with";;
                esac
        fi

        if [[ ${hidden} == "no" ]] ; then
                local IUSE_BUILT=( $(<"${IUSEFILE}") )
                # Don't check USE_EXPAND #147237
                local expand
                for expand in $(echo ${USE_EXPAND} | tr '[:upper:]' '[:lower:]') ; do
                        if [[ $1 == ${expand}_* ]] ; then
                                expand=""
                                break
                        fi
                done
                if [[ -n ${expand} ]] ; then
                        if ! has $1 ${IUSE_BUILT[@]#[-+]} ; then
                                case ${missing_action} in
                                        true)  return 0;;
                                        false) return 1;;
                                        die)   die "$PKG does not actually support the $1 USE flag!";;
                                esac
                        fi
                fi
        fi

        local USE_BUILT=$(<${USEFILE})
        while [[ $# -gt 0 ]] ; do
                if [[ ${opt} = "-o" ]] ; then
                        has $1 ${USE_BUILT} && return 0
                else
                        has $1 ${USE_BUILT} || return 1
                fi
                shift
        done
        [[ ${opt} = "-a" ]]
}

# @FUNCTION: epunt_cxx
# @USAGE: [dir to scan]
# @DESCRIPTION:
# Many configure scripts wrongly bail when a C++ compiler could not be
# detected.  If dir is not specified, then it defaults to ${S}.
#
# http://bugs.gentoo.org/73450
epunt_cxx() {
        local dir=$1
        [[ -z ${dir} ]] && dir=${S}
        ebegin "Removing useless C++ checks"
        local f
        find "${dir}" -name configure | while read f ; do
                patch --no-backup-if-mismatch -p0 "${f}" "${PORTDIR}/eclass/ELT-patches/nocxx/nocxx.patch" > /dev/null
        done
        eend 0
}

# @FUNCTION: make_wrapper
# @USAGE: <wrapper> <target> [chdir] [libpaths] [installpath]
# @DESCRIPTION:
# Create a shell wrapper script named wrapper in installpath
# (defaults to the bindir) to execute target (default of wrapper) by
# first optionally setting LD_LIBRARY_PATH to the colon-delimited
# libpaths followed by optionally changing directory to chdir.
make_wrapper() {
        local wrapper=$1 bin=$2 chdir=$3 libdir=$4 path=$5
        local tmpwrapper=$(emktemp)
        # We don't want to quote ${bin} so that people can pass complex
        # things as $bin ... "./someprog --args"
        cat << EOF > "${tmpwrapper}"
#!/bin/sh
cd "${chdir:-.}"
if [ -n "${libdir}" ] ; then
        if [ "\${LD_LIBRARY_PATH+set}" = "set" ] ; then
                export LD_LIBRARY_PATH="\${LD_LIBRARY_PATH}:${libdir}"
        else
                export LD_LIBRARY_PATH="${libdir}"
        fi
fi
exec ${bin} "\$@"
EOF
        chmod go+rx "${tmpwrapper}"
        if [[ -n ${path} ]] ; then
                (
                exeinto "${path}"
                newexe "${tmpwrapper}" "${wrapper}"
                ) || die
        else
                newbin "${tmpwrapper}" "${wrapper}" || die
        fi
}

# @FUNCTION: path_exists
# @USAGE: [-a|-o] <paths>
# @DESCRIPTION:
# Check if the specified paths exist.  Works for all types of paths
# (files/dirs/etc...).  The -a and -o flags control the requirements
# of the paths.  They correspond to "and" and "or" logic.  So the -a
# flag means all the paths must exist while the -o flag means at least
# one of the paths must exist.  The default behavior is "and".  If no
# paths are specified, then the return value is "false".
path_exists() {
        local opt=$1
        [[ ${opt} == -[ao] ]] && shift || opt="-a"

        # no paths -> return false
        # same behavior as: [[ -e "" ]]
        [[ $# -eq 0 ]] && return 1

        local p r=0
        for p in "$@" ; do
                [[ -e ${p} ]]
                : $(( r += $? ))
        done

        case ${opt} in
                -a) return $(( r != 0 )) ;;
                -o) return $(( r == $# )) ;;
        esac
}

# @FUNCTION: in_iuse
# @USAGE: <flag>
# @DESCRIPTION:
# Determines whether the given flag is in IUSE. Strips IUSE default prefixes
# as necessary.
#
# Note that this function should not be used in the global scope.
in_iuse() {
        debug-print-function ${FUNCNAME} "${@}"
        [[ ${#} -eq 1 ]] || die "Invalid args to ${FUNCNAME}()"

        local flag=${1}
        local liuse=( ${IUSE} )

        has "${flag}" "${liuse[@]#[+-]}"
}

# @FUNCTION: use_if_iuse
# @USAGE: <flag>
# @DESCRIPTION:
# Return true if the given flag is in USE and IUSE.
#
# Note that this function should not be used in the global scope.
use_if_iuse() {
        in_iuse $1 || return 1
        use $1
}

# @FUNCTION: usex
# @USAGE: <USE flag> [true output] [false output] [true suffix] [false suffix]
# @DESCRIPTION:
# Proxy to declare usex for package managers or EAPIs that do not provide it
# and use the package manager implementation when available (i.e. EAPI >= 5).
# If USE flag is set, echo [true output][true suffix] (defaults to "yes"),
# otherwise echo [false output][false suffix] (defaults to "no").
if has "${EAPI:-0}" 0 1 2 3 4; then
        usex() { use "$1" && echo "${2-yes}$4" || echo "${3-no}$5" ; } #382963
fi

# @FUNCTION: prune_libtool_files
# @USAGE: [--all]
# @DESCRIPTION:
# Locate unnecessary libtool files (.la) and libtool static archives
# (.a) and remove them from installation image.
#
# By default, .la files are removed whenever the static linkage can
# either be performed using pkg-config or doesn't introduce additional
# flags.
#
# If '--all' argument is passed, all .la files are removed. This is
# usually useful when the package installs plugins and does not use .la
# files for loading them.
#
# The .a files are only removed whenever corresponding .la files state
# that they should not be linked to, i.e. whenever these files
# correspond to plugins.
#
# Note: if your package installs both static libraries and .pc files,
# you need to add pkg-config to your DEPEND.
prune_libtool_files() {
        debug-print-function ${FUNCNAME} "$@"

        local removing_all opt
        for opt; do
                case "${opt}" in
                        --all)
                                removing_all=1
                                ;;
                        *)
                                die "Invalid argument to ${FUNCNAME}(): ${opt}"
                esac
        done

        local f
        while IFS= read -r -d '' f; do # for all .la files
                local archivefile=${f/%.la/.a}

                [[ ${f} != ${archivefile} ]] || die 'regex sanity check failed'

                # Remove static libs we're not supposed to link against.
                if grep -q '^shouldnotlink=yes$' "${f}"; then
                        if [[ -f ${archivefile} ]]; then
                                einfo "Removing unnecessary ${archivefile#${D%/}} (static plugin)"
                                rm -f "${archivefile}"
                        fi

                        # The .la file may be used by a module loader, so avoid removing it
                        # unless explicitly requested.
                        [[ ${removing_all} ]] || continue
                fi

                # Remove .la files when:
                # - user explicitly wants us to remove all .la files,
                # - respective static archive doesn't exist,
                # - they are covered by a .pc file already,
                # - they don't provide any new information (no libs & no flags).
                local reason pkgconfig_scanned
                if [[ ${removing_all} ]]; then
                        reason='requested'
                elif [[ ! -f ${archivefile} ]]; then
                        reason='no static archive'
                elif [[ ! $(sed -nre \
                                "s/^(dependency_libs|inherited_linker_flags)='(.*)'$/\2/p" \
                                "${f}") ]]; then
                        reason='no libs & flags'
                else
                        if [[ ! ${pkgconfig_scanned} ]]; then
                                # Create a list of all .pc-covered libs.
                                local pc_libs=()
                                if [[ ! ${removing_all} ]]; then
                                        local f
                                        local tf=${T}/prune-lt-files.pc
                                        local pkgconf=$(tc-getPKG_CONFIG)

                                        while IFS= read -r -d '' f; do # for all .pc files
                                                local arg

                                                sed -e '/^Requires:/d' "${f}" > "${tf}"
                                                for arg in $("${pkgconf}" --libs "${tf}"); do
                                                        [[ ${arg} == -l* ]] && pc_libs+=( lib${arg#-l}.la )
                                                done
                                        done < <(find "${D}" -type f -name '*.pc' -print0)

                                        rm -f "${tf}"
                                fi

                                pkgconfig_scanned=1
                        fi

                        has "${f##*/}" "${pc_libs[@]}" && reason='covered by .pc'
                fi

                if [[ ${reason} ]]; then
                        einfo "Removing unnecessary ${f#${D%/}} (${reason})"
                        rm -f "${f}"
                fi
        done < <(find "${D}" -type f -name '*.la' -print0)
}

check_license() { die "you no longer need this as portage supports ACCEPT_LICENSE itself"; }

fi