lotus/bin/dist_get

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2019-09-13 22:29:38 +00:00
#!/bin/sh
GOCC=${GOCC=go}
die() {
echo "$@" >&2
exit 1
}
have_binary() {
type "$1" > /dev/null 2> /dev/null
}
check_writable() {
printf "" > "$1" && rm "$1"
}
try_download() {
url="$1"
output="$2"
command="$3"
util_name="$(set -- $command; echo "$1")"
if ! have_binary "$util_name"; then
return 1
fi
printf '==> Using %s to download "%s" to "%s"\n' "$util_name" "$url" "$output"
if eval "$command"; then
echo "==> Download complete!"
return
else
echo "error: couldn't download with $util_name ($?)"
return 1
fi
}
download() {
dl_url="$1"
dl_output="$2"
test "$#" -eq "2" || die "download requires exactly two arguments, was given $@"
if ! check_writable "$dl_output"; then
die "download error: cannot write to $dl_output"
fi
try_download "$dl_url" "$dl_output" "wget '$dl_url' -O '$dl_output'" && return
try_download "$dl_url" "$dl_output" "curl --silent --fail --output '$dl_output' '$dl_url'" && return
try_download "$dl_url" "$dl_output" "fetch '$dl_url' -o '$dl_output'" && return
try_download "$dl_url" "$dl_output" "http '$dl_url' > '$dl_output'" && return
try_download "$dl_url" "$dl_output" "ftp -o '$dl_output' '$dl_url'" && return
die "Unable to download $dl_url. exiting."
}
unarchive() {
ua_archivetype="$1"
ua_infile="$2"
ua_outfile="$3"
ua_distname="$4"
ua_binpostfix=""
ua_os=$(uname -o)
if [ "$ua_os" = "Msys" ] || [ "$ua_os" = "Cygwin" ] ; then
ua_binpostfix=".exe"
fi
ua_outfile="$ua_outfile$ua_binpostfix"
if ! check_writable "$ua_outfile"; then
die "unarchive error: cannot write to $ua_outfile"
fi
case "$ua_archivetype" in
tar.gz)
if have_binary tar; then
echo "==> using 'tar' to extract binary from archive"
< "$ua_infile" tar -Ozxf - "$ua_distname/$ua_distname$ua_binpostfix" > "$ua_outfile" \
|| die "tar has failed"
else
die "no binary on system for extracting tar files"
fi
;;
zip)
if have_binary unzip; then
echo "==> using 'unzip' to extract binary from archive"
unzip -p "$ua_infile" "$ua_distname/$ua_distname$ua_binpostfix" > "$ua_outfile" \
|| die "unzip has failed"
else
die "no installed method for extracting .zip archives"
fi
;;
*)
die "unrecognized archive type '$ua_archivetype'"
esac
chmod +x "$ua_outfile" || die "chmod has failed"
}
get_go_vars() {
if [ ! -z "$GOOS" ] && [ ! -z "$GOARCH" ]; then
printf "%s-%s" "$GOOS" "$GOARCH"
elif have_binary go; then
printf "%s-%s" "$($GOCC env GOOS)" "$($GOCC env GOARCH)"
else
die "no way of determining system GOOS and GOARCH\nPlease manually set GOOS and GOARCH then retry."
fi
}
mkurl() {
m_root="$1"
m_name="$2"
m_vers="$3"
m_archive="$4"
m_govars=$(get_go_vars) || die "could not get go env vars"
echo "https://ipfs.io$m_root/$m_name/$m_vers/${m_name}_${m_vers}_$m_govars.$m_archive"
}
distroot="$1"
distname="$2"
outpath="$3"
version="$4"
if [ -z "$distroot" ] || [ -z "$distname" ] || [ -z "$outpath" ] || [ -z "$version" ]; then
die "usage: dist_get <distroot> <distname> <outpath> <version>"
fi
case $version in
v*)
# correct input
;;
*)
echo "invalid version '$version'" >&2
die "versions must begin with 'v', for example: v0.4.0"
;;
esac
# TODO: don't depend on the go tool being installed to detect this
goenv=$(get_go_vars) || die "could not get go env vars"
case $goenv in
linux-*)
archive="tar.gz"
;;
darwin-*)
archive="tar.gz"
;;
windows-*)
archive="zip"
;;
freebsd-*)
archive="tar.gz"
;;
openbsd-*)
archive="tar.gz"
;;
*)
echo "unrecognized system environment: $goenv" >&2
die "currently only linux, darwin, windows and freebsd are supported by this script"
esac
mkdir -p bin/tmp
url=$(mkurl "$distroot" "$distname" "$version" "$archive")
tmpfi="bin/tmp/$distname.$archive"
download "$url" "$tmpfi"
if [ $? -ne 0 ]; then
die "failed to download $url to $tmpfi"
fi
unarchive "$archive" "$tmpfi" "$outpath" "$distname"
if [ $? -ne 0 ]; then
die "failed to extract archive $tmpfi"
fi