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# Copyright 1999-2019 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
DESCRIPTION="Manage the Rust compiler versions"
MAINTAINER="rust@gentoo.org"
VERSION="@VERSION@"
ENV_D_PATH="${EROOT%/}/etc/env.d"
BIN_DIR="${EROOT%/}/usr/bin"
inherit package-manager path-manipulation
# find a list of missing or broken symlinks
# each compiler installs a list of provided programs.
# this function checks if a symlink for a provided program
# is missing or broken for the current active Rust implementation
find_missing_broken_symlinks() {
local -a missing_symlinks
local required_symlinks=( "/usr/bin/rustc" $(get_last_set_symlinks) )
for i in "${required_symlinks[@]}"; do
local symlink="${EROOT%/}${i}"
if [[ -L "${symlink}" && -e "${symlink}" ]]; then
# existing symlink
continue
else
missing_symlinks+=( "${symlink}" )
fi
done
echo "${missing_symlinks[@]}"
}
# find a list of installed rust compilers
# each compiler provider should install
# a config file named provider-$pkgname-$pkgver
# in "${ENV_D_PATH}/rust" directory
# this function prints list of $pkgname-$pkgver values
find_targets() {
local f fn
local -a providers
local -a providers_unsorted
local -a providers_sorted
for f in "${ENV_D_PATH}"/rust/provider-*; do
[[ -f ${f} ]] || continue
fn="${f##*/provider-}"
if [[ "${fn}" == rust-bin-* ]]; then
providers_unsorted+=( "${fn##rust-bin-}-mysortA" )
elif [[ "${fn}" == rust-* ]]; then
providers_unsorted+=( "${fn##rust-}-mysortZ" )
else
die -q "Unsupported rust provider file '${f}' found."
fi
done
IFS=$'\n' LC_COLLATE=C providers_sorted=( $(sort <<<"${providers_unsorted[*]}") )
for fn in "${providers_sorted[@]}"; do
if [[ "${fn}" == *-mysortA ]]; then
providers+=( "rust-bin-${fn%%-mysortA}" )
else
providers+=( "rust-${fn%%-mysortZ}" )
fi
done
echo "${providers[@]}"
}
#get rustc postfix
get_postfix() {
local target=$1
echo "${target}" | cut -d- -f2-
}
#get current target
get_current_target() {
local i targets=( $(find_targets) )
for (( i = 0; i < ${#targets[@]}; i++ )); do
[[ rustc-$(get_postfix ${targets[i]}) = \
$(basename "$(canonicalise "${BIN_DIR}/rustc")") ]] \
&& echo $i && return 0
done
echo "NOT_SET"
}
#get symlinks list from file or the default value
get_symlinks_from_file() {
local filename=$1
local symlinks=()
local i
if [[ -e ${filename} ]]; then
for i in `cat "${filename}"`; do
symlinks+=($i)
done
fi
if [ ${#symlinks[@]} -eq 0 ]; then
echo /usr/bin/rustdoc
else
echo "${symlinks[@]}"
fi
}
#get last set symlinks
get_last_set_symlinks() {
local symlinks=( $(get_symlinks_from_file "${ENV_D_PATH}/rust/last-set") )
echo "${symlinks[@]}"
}
#get lists of symlinks
get_symlinks() {
local target=$1
if [ "${target}" == "NOT_SET" ]; then
echo /usr/bin/rustdoc
return
fi
if is_number "${target}"; then
local targets=( $(find_targets) )
target=${targets[target]}
fi
local symlinks=( $(get_symlinks_from_file "${ENV_D_PATH}/rust/provider-${target}") )
echo "${symlinks[@]}"
}
# remove symlink if exists
remove_symlink() {
local symlink=$1
if [[ -L ${symlink} ]]; then
# existing symlink
rm ${symlink} || die -q "Couldn't remove existing symlink ${symlink}"
elif [[ -e ${symlink} ]]; then
# we have something strange
die -q "${symlink} exists but is not a symlink"
fi
}
# set symlink if source exists
set_symlink() {
local source=$1
local dest=$2
remove_symlink "${dest}"
if [[ -e ${source} ]]; then
mkdir -p "$(dirname ${dest})" || die -q "directory creation failed for $(dirname ${dest})"
ln -s "${source}" "${dest}" || die -q "${dest} symlink setting failed"
else
false
fi
}
# unset the rust version
unset_version() {
local symlinks=( $(get_last_set_symlinks) )
for i in "${symlinks[@]}"; do
remove_symlink "${EROOT%/}${i}"
done
remove_symlink "${BIN_DIR}/rustc"
rm -f "${ENV_D_PATH}/rust/last-set" \
|| die -q "rm -f ${ENV_D_PATH}/rust/last-set failed"
}
# set the rust version
# each compiler provider should install
# files named rustc-$postfix and rustdoc-$postfix
# in ${BIN_DIR} directory
# $postfix is defined as the part of $pkgname-$pkgver after the first -
# for dev-lang/rust-bin-9999 ebuild it would be bin-9999
set_version() {
local target=$1
if is_number "${target}"; then
local targets=( $(find_targets) )
target=${targets[target-1]}
fi
target_postfix=$(get_postfix ${target})
[[ -z ${target_postfix} || ! -x "${BIN_DIR}/rustc-${target_postfix}" ]] \
&& die -q "Target \"$1\" doesn't appear to be valid!"
unset_version
set_symlink "${BIN_DIR}/rustc-${target_postfix}" "${BIN_DIR}/rustc"
local symlinks=( $(get_symlinks ${target}) )
for i in "${symlinks[@]}"; do
set_symlink "${EROOT%/}${i}-${target_postfix}" "${EROOT%/}${i}"
done
cp "${ENV_D_PATH}/rust/provider-${target}" \
"${ENV_D_PATH}/rust/last-set" || \
die -q "symlink list copying failed"
}
### cleanup action ###
describe_cleanup() {
echo "This action is not to be called manually."
}
do_cleanup() {
[[ -z ${@} ]] || die -q "This function does not expect any arguments"
# Do we need to clean up?
local missing_symlinks=( $(find_missing_broken_symlinks) )
if [[ ${#missing_symlinks[@]} -eq 0 ]]; then
echo "Nothing to clean up."
return
fi
unset_version
local targets=( $(find_targets) )
if [[ ${#targets[@]} -ne 0 ]]; then
echo "Marking the latest still installed version as default..."
do_set ${#targets[@]}
else
echo "No Rust profiles left on the system. Stale symlinks removed."
fi
}
### list action ###
describe_list() {
echo "List available Rust versions"
}
do_list() {
local i
local targets=( $(find_targets) )
local target=$(get_current_target)
if is_number "${target}"; then
targets[target]=$(highlight_marker "${targets[target]}")
fi
write_list_start "Available Rust versions:"
write_numbered_list -m "(none found)" "${targets[@]}"
}
### set action ###
describe_set() {
echo "Set active Rust version"
}
describe_set_parameters() {
echo "<target>"
}
describe_set_options() {
echo "target : Target number (from 'list' action)"
}
do_set() {
[[ -z $1 ]] && die -q "You didn't tell me what to set the version to"
[[ $# -gt 1 ]] && die -q "Too many parameters"
set_version "$1" || die -q "Couldn't set new active version"
}
### update action ###
describe_update() {
echo "Switch to the most recent Rust compiler"
}
describe_update_options() {
echo "--if-unset : Do not override existing implementation"
}
do_update() {
local if_unset="0"
while [[ $# > 0 ]]; do
case "$1" in
--if-unset)
if_unset="1"
;;
*)
die -q "Unrecognized argument '$1'"
;;
esac
shift
done
if [[ "${if_unset}" == "1" ]]; then
local missing_symlinks=( $(find_missing_broken_symlinks) )
if [[ ${#missing_symlinks[@]} -eq 0 ]]; then
return
else
echo "Not all symlinks set. Will switch to the most recent Rust compiler!"
fi
fi
local targets=( $(find_targets) )
do_set ${#targets[@]}
}
### unset action ###
describe_unset() {
echo 'DEPRECATED: Use "cleanup" action instead!'
}
do_unset() {
do_cleanup
}
# vim: set ft=eselect :
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