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Add portable version of readlink -f

Browse source 
from https://github.com/ko1nksm/readlinkf/blob/master/readlinkf.sh
(license: CC0)

Mac readlink does not support the -f flag, which is not
in POSIX.
This commit is contained in:
Jeff Epler 2021-01-13 15:30:06 -06:00
parent 5d6d7a3248
commit 793eef4030
2 changed files with 72 additions and 2 deletions
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37
build-cp.sh
View file

@ -1,7 +1,42 @@
#!/bin/sh
set -e
# POSIX compliant version
readlinkf_posix() {
[ "${1:-}" ] || return 1
max_symlinks=40
CDPATH='' # to avoid changing to an unexpected directory
target=$1
[ -e "${target%/}" ] || target=${1%"${1##*[!/]}"} # trim trailing slashes
[ -d "${target:-/}" ] && target="$target/"
cd -P . 2>/dev/null || return 1
while [ "$max_symlinks" -ge 0 ] && max_symlinks=$((max_symlinks - 1)); do
if [ ! "$target" = "${target%/*}" ]; then
case $target in
/*) cd -P "${target%/*}/" 2>/dev/null || break ;;
*) cd -P "./${target%/*}" 2>/dev/null || break ;;
esac
target=${target##*/}
fi
if [ ! -L "$target" ]; then
target="${PWD%/}${target:+/}${target}"
printf '%s\n' "${target:-/}"
return 0
fi
# `ls -dl` format: "%s %u %s %s %u %s %s -> %s\n",
# <file mode>, <number of links>, <owner name>, <group name>,
# <size>, <date and time>, <pathname of link>, <contents of link>
# https://pubs.opengroup.org/onlinepubs/9699919799/utilities/ls.html
link=$(ls -dl -- "$target" 2>/dev/null) || break
target=${link#*" $target -> "}
done
return 1
}
nproc=$(python -c 'import multiprocessing; print(multiprocessing.cpu_count())')
HERE="$(dirname -- "$(readlink -f -- "${0}")" )"
HERE="$(dirname -- "$(readlinkf_posix -- "${0}")" )"
[ -e circuitpython/py/py.mk ] || (git clone --depth 100 --branch 6.0.x https://github.com/adafruit/circuitpython && cd circuitpython && git submodule update --init)
rm -rf circuitpython/extmod/ulab; ln -s "$HERE" circuitpython/extmod/ulab
make -C circuitpython/mpy-cross -j$nproc

37
build.sh
View file

@ -1,6 +1,41 @@
#!/bin/sh
# POSIX compliant version
readlinkf_posix() {
[ "${1:-}" ] || return 1
max_symlinks=40
CDPATH='' # to avoid changing to an unexpected directory
target=$1
[ -e "${target%/}" ] || target=${1%"${1##*[!/]}"} # trim trailing slashes
[ -d "${target:-/}" ] && target="$target/"
cd -P . 2>/dev/null || return 1
while [ "$max_symlinks" -ge 0 ] && max_symlinks=$((max_symlinks - 1)); do
if [ ! "$target" = "${target%/*}" ]; then
case $target in
/*) cd -P "${target%/*}/" 2>/dev/null || break ;;
*) cd -P "./${target%/*}" 2>/dev/null || break ;;
esac
target=${target##*/}
fi
if [ ! -L "$target" ]; then
target="${PWD%/}${target:+/}${target}"
printf '%s\n' "${target:-/}"
return 0
fi
# `ls -dl` format: "%s %u %s %s %u %s %s -> %s\n",
# <file mode>, <number of links>, <owner name>, <group name>,
# <size>, <date and time>, <pathname of link>, <contents of link>
# https://pubs.opengroup.org/onlinepubs/9699919799/utilities/ls.html
link=$(ls -dl -- "$target" 2>/dev/null) || break
target=${link#*" $target -> "}
done
return 1
}
set -e
HERE="$(dirname -- "$(readlink -f -- "${0}")" )"
HERE="$(dirname -- "$(readlinkf_posix -- "${0}")" )"
[ -e micropython/py/py.mk ] || git clone https://github.com/micropython/micropython
[ -e micropython/lib/libffi/autogen.sh ] || (cd micropython && git submodule update --init lib/libffi )
#git clone https://github.com/micropython/micropython