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Fallbacks to wget if curl not installed #1373

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merged 2 commits into from
Mar 22, 2018
Merged

Fallbacks to wget if curl not installed #1373

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299427a
fallbacks to wget if curl not installed
ruihe774 Oct 21, 2017
faa08bd
Avoid duplication of command -v
t-botz Mar 8, 2018
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35 changes: 30 additions & 5 deletions rustup-init.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -9,8 +9,8 @@
# option. This file may not be copied, modified, or distributed
# except according to those terms.

# This is just a little script that can be curled from the internet to
# install rustup. It just does platform detection, curls the installer
# This is just a little script that can be downloaded from the internet to
# install rustup. It just does platform detection, downloads the installer
# and runs it.

set -u
Expand Down Expand Up @@ -41,8 +41,8 @@ EOF
}

main() {
downloader --check
need_cmd uname
need_cmd curl
need_cmd mktemp
need_cmd chmod
need_cmd mkdir
Expand Down Expand Up @@ -100,7 +100,7 @@ main() {
fi

ensure mkdir -p "$_dir"
ensure curl -sSfL "$_url" -o "$_file"
ensure downloader "$_url" "$_file"
ensure chmod u+x "$_file"
if [ ! -x "$_file" ]; then
printf '%s\n' "Cannot execute $_file (likely because of mounting /tmp as noexec)." 1>&2
Expand Down Expand Up @@ -331,11 +331,16 @@ err() {
}

need_cmd() {
if ! command -v "$1" > /dev/null 2>&1
if ! check_cmd "$1"
then err "need '$1' (command not found)"
fi
}

check_cmd() {
command -v "$1" > /dev/null 2>&1
return $?
}

need_ok() {
if [ $? != 0 ]; then err "$1"; fi
}
Expand All @@ -359,4 +364,24 @@ ignore() {
"$@"
}

# This wraps curl or wget. Try curl first, if not installed,
# use wget instead.
downloader() {
if check_cmd curl
then _dld=curl
elif check_cmd wget
then _dld=wget
else _dld='curl or wget' # to be used in error message of need_cmd
fi

if [ "$1" = --check ]
then need_cmd "$_dld"
elif [ "$_dld" = curl ]
then curl -sSfL "$1" -o "$2"
elif [ "$_dld" = wget ]
then wget "$1" -O "$2"
else err "Unknown downloader" # should not reach here
fi
}

main "$@" || exit 1