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# Copyright 2020 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
# @ECLASS: eapi8-dosym.eclass
# @MAINTAINER:
# PMS team <pms@gentoo.org>
# @AUTHOR:
# Ulrich Müller <ulm@gentoo.org>
# @SUPPORTED_EAPIS: 5 6 7
# @BLURB: Testing implementation of EAPI 8 dosym -r option
# @DESCRIPTION:
# A stand-alone implementation of the dosym command aimed for EAPI 8.
# Intended to be used for wider testing of the proposed option and to
# allow ebuilds to switch to the new model early, with minimal change
# needed for actual EAPI 8.
#
# https://bugs.gentoo.org/708360
case ${EAPI} in
5|6|7) ;;
*) die "${ECLASS}: EAPI=${EAPI:-0} not supported" ;;
esac
# @FUNCTION: _dosym8_canonicalize
# @USAGE: <path>
# @INTERNAL
# @DESCRIPTION:
# Transparent bash-only replacement for GNU "realpath -m -s".
# Resolve references to "/./", "/../" and remove extra "/" characters
# from <path>, without touching any actual file.
_dosym8_canonicalize() {
local path slash i prev out IFS=/
path=( $1 )
[[ $1 == /* ]] && slash=/
while true; do
# Find first instance of non-".." path component followed by "..",
# or as a special case, "/.." at the beginning of the path.
# Also drop empty and "." path components as we go along.
prev=
for i in ${!path[@]}; do
if [[ -z ${path[i]} || ${path[i]} == . ]]; then
unset "path[i]"
elif [[ ${path[i]} != .. ]]; then
prev=${i}
elif [[ ${prev} || ${slash} ]]; then
# Found, remove path components and reiterate
[[ ${prev} ]] && unset "path[prev]"
unset "path[i]"
continue 2
fi
done
# No (further) instance found, so we're done
break
done
out="${slash}${path[*]}"
echo "${out:-.}"
}
# @FUNCTION: dosym8
# @USAGE: [-r] <target> <link>
# @DESCRIPTION:
# Create a symbolic link <link>, pointing to <target>. If the
# directory containing the new link does not exist, create it.
#
# If called with option -r, expand <target> relative to the apparent
# path of the directory containing <link>. For example, "dosym8 -r
# /bin/foo /usr/bin/foo" will create a link named "../../bin/foo".
dosym8() {
local option_r
case $1 in
-r) option_r=t; shift ;;
esac
[[ $# -eq 2 ]] || die "${FUNCNAME}: bad number of arguments"
local target=$1 link=$2
if [[ ${option_r} ]]; then
local linkdir comp
# Expansion makes sense only for an absolute target path
[[ ${target} == /* ]] \
|| die "${FUNCNAME}: -r specified but no absolute target path"
target=$(_dosym8_canonicalize "${target}")
linkdir=$(_dosym8_canonicalize "/${link#/}")
linkdir=${linkdir%/*} # poor man's dirname(1)
linkdir=${linkdir:-/} # always keep the initial "/"
local ifs_save=${IFS-$' \t\n'} IFS=/
for comp in ${linkdir}; do
if [[ ${target%%/*} == "${comp}" ]]; then
target=${target#"${comp}"}
target=${target#/}
else
target=..${target:+/}${target}
fi
done
IFS=${ifs_save}
target=${target:-.}
fi
dosym "${target}" "${link}"
}
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