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|
#!/bin/sh -eu
# Copyright 2016-2018 Samuel Holland <samuel@sholland.org>
# SPDX-License-Identifier: 0BSD
ME=${0##*/}
VERSION=0.2.0
echo() {
printf '%s\n' "$*"
}
echo_lines() {
printf '%s\n' "$@"
}
msg() {
printf >&2 '%s: %s\n' "$ME" "$*"
}
musl_arch() {
$ROOT/usr/lib/libc.so 2>&1 | sed -n 's/^musl libc (\(.*\))$/\1/p'
}
musl_version() {
$ROOT/usr/lib/libc.so 2>&1 | sed -n 's/^Version //p'
}
read_ldso_conf() {
local conf="$*" d dir file glob line
# Start with the default "trusted" directories
set -- /lib /usr/lib
for file in $conf; do
test -r "$file" || continue
$VERBOSE && msg "Reading ${file}"
while read -r line; do
line=$(tokenize ${line%%#*})
if test "${line#include }" != "$line"; then
glob=${file%/*}/${line#include }
$VERBOSE && msg "Including ${glob}"
line=$(read_ldso_conf $glob)
fi
for dir in $line; do
# Ignore missing directories
test -d "$ROOT$dir" || continue
# Ignore duplicate directories
for d; do test "$d" = "$dir" && continue 2; done
set -- "$@" "$dir"
done
done < "$file"
done
echo_lines "$@"
}
tokenize() {
echo "$*" | sed 's/=libc[456]//g;y/:,/ /' | xargs
}
LDSO_CACHE="/etc/ld.so.cache"
LDSO_CONF="/etc/ld.so.conf"
LIBRARY_MODE=false
ONLYARG_MODE=false
PRINT_CACHE=false
PRINT_VERSION=false
ROOT=
UPDATE_CACHE=true
UPDATE_LINKS=true
VERBOSE=false
while getopts ":c:C:Df:ilnNpr:vVX" OPTION; do
case "$OPTION" in
C)
LDSO_CACHE=$OPTARG
;;
D)
UPDATE_CACHE=false
UPDATE_LINKS=false
;;
f)
LDSO_CONF=$OPTARG
;;
l)
LIBRARY_MODE=true
;;
n)
ONLYARG_MODE=true
;;
N)
UPDATE_CACHE=false
;;
p)
PRINT_CACHE=true
;;
r)
ROOT=$OPTARG
if ! test -x $ROOT/usr/lib/libc.so; then
msg "${ROOT} does not appear to be a valid root directory"
exit 1
fi
;;
v)
VERBOSE=true
;;
V)
PRINT_VERSION=true
;;
X)
UPDATE_LINKS=false
;;
c|i)
msg "Ignored option -${OPTION}"
;;
\?)
msg "Invalid option -${OPTARG}"
cat >&2 <<- EOF
Usage: $ME [-DnNvX] [-C cache] [-f conf] [-r root] [dir...]
$ME [-v] -l lib...
$ME [-v] [-C cache] [-r root] -p
$ME -V
EOF
exit 1
;;
esac
done
shift $((OPTIND-1))
BANNER="ldconfig ${VERSION} for musl $(musl_version)"
LDSO_CACHE="$ROOT$LDSO_CACHE"
LDSO_CONF="$ROOT$LDSO_CONF"
LDSO_PATH="$ROOT/etc/ld-musl-$(musl_arch).path"
LDSO_PATH_TMP="$LDSO_PATH.$$"
if $PRINT_VERSION; then
echo "$BANNER"
exit 0
elif $PRINT_CACHE; then
test -r "$LDSO_PATH" && cat "$LDSO_PATH"
exit 0
fi
$VERBOSE && echo "$BANNER"
if $LIBRARY_MODE; then
for lib; do
soname=$(scanelf -qS "$ROOT$lib")
soname=${soname%% *}
done
exit 0
fi
# Update musl's list of library paths
if ! test -w "${LDSO_PATH%/*}"; then
msg "You do not have permission to update ${LDSO_PATH}"
exit 0
fi
trap 'rm -f "$LDSO_PATH_TMP"' EXIT
read_ldso_conf "$LDSO_CONF" > "$LDSO_PATH_TMP"
$VERBOSE && msg "Writing ${LDSO_PATH}"
mv "$LDSO_PATH_TMP" "$LDSO_PATH"
trap - EXIT
# Read the updated list of library paths
$ONLYARG_MODE || set -- "$@" $(cat "$LDSO_PATH")
if $UPDATE_LINKS; then
for dir; do
# Packages are responsible for libraries in these directories
if test "$dir" = /lib || test "$dir" = /usr/lib; then
continue
fi
$VERBOSE && msg "Scanning ${ROOT}${dir}"
scanelf -qS "$ROOT$dir" | while read soname file; do
link=${file%/*}/$soname
test -f "$link" && continue
$VERBOSE && msg "Creating link ${link}"
ln -fns "${file##*/}" "$link"
done
done
fi
if $UPDATE_CACHE && test $# -gt 0; then
touch "$ROOT$LDSO_CACHE"
fi
|
