[Fix] enable curl compression only on curl >=7.21.0

curl < 7.21.0 will output redirection reponse body to the output when compressed, which will cause tarball is prepended with redirection reponse body and leads to checksum mismatch.

 - add `nvm_curl_use_compression` and `nvm_curl_version`

nvm.sh

@@ -79,11 +79,15 @@ nvm_curl_libz_support() {
   curl -V 2>/dev/null | nvm_grep "^Features:" | nvm_grep -q "libz"
 }
 
+nvm_curl_use_compression() {
+  nvm_curl_libz_support && nvm_version_greater_than_or_equal_to "$(nvm_curl_version)" 7.21.0;
+}
+
 nvm_get_latest() {
   local NVM_LATEST_URL
   local CURL_COMPRESSED_FLAG
   if nvm_has "curl"; then
-    if nvm_curl_libz_support; then
+    if nvm_curl_use_compression; then
       CURL_COMPRESSED_FLAG="--compressed"
     fi
     NVM_LATEST_URL="$(curl "${CURL_COMPRESSED_FLAG:-}" -q -w "%{url_effective}\n" -L -s -S http://latest.nvm.sh -o /dev/null)"
@@ -103,7 +107,7 @@ nvm_get_latest() {
 nvm_download() {
   local CURL_COMPRESSED_FLAG
   if nvm_has "curl"; then
-    if nvm_curl_libz_support; then
+    if nvm_curl_use_compression; then
       CURL_COMPRESSED_FLAG="--compressed"
     fi
     curl "${CURL_COMPRESSED_FLAG:-}" -q "$@"
@@ -221,6 +225,10 @@ nvm_clang_version() {
   clang --version | command awk '{ if ($2 == "version") print $3; else if ($3 == "version") print $4 }' | command sed 's/-.*$//g'
 }
 
+nvm_curl_version() {
+  curl -V | command awk '{ if ($1 == "curl") print $2 }' | command sed 's/-.*$//g'
+}
+
 nvm_version_greater() {
   command awk 'BEGIN {
     if (ARGV[1] == "" || ARGV[2] == "") exit(1)
@@ -3284,7 +3292,7 @@ nvm() {
         nvm_version_greater nvm_version_greater_than_or_equal_to \
         nvm_print_npm_version nvm_npm_global_modules \
         nvm_has_system_node nvm_has_system_iojs \
-        nvm_download nvm_get_latest nvm_has nvm_install_default_packages \
+        nvm_download nvm_get_latest nvm_has nvm_install_default_packages nvm_curl_use_compression nvm_curl_version \
         nvm_supports_source_options nvm_auto nvm_supports_xz \
         nvm_echo nvm_err nvm_grep nvm_cd \
         nvm_die_on_prefix nvm_get_make_jobs nvm_get_minor_version \

test/fast/Unit tests/nvm_curl_use_compression

@@ -0,0 +1,38 @@
+#!/bin/sh
+
+cleanup () {
+  unset -f die
+}
+
+die () { echo -e "$@" ; cleanup ;  exit 1; }
+
+NVM_ENV=testing \. ../../../nvm.sh
+
+curl() {
+  if [ "$1" = "-V" ]; then
+    echo "${VERSION_MESSAGE}"
+  fi
+}
+
+CURL_VERSION_ON_ARCHLINUX_WITH_LIBZ="curl 7.54.0 (x86_64-pc-linux-gnu) libcurl/7.54.0 OpenSSL/1.1.0f zlib/1.2.11 libpsl/0.17.0 (+libicu/59.1) libssh2/1.8.0 nghttp2/1.22.0
+Protocols: dict file ftp ftps gopher http https imap imaps pop3 pop3s rtsp scp sftp smb smbs smtp smtps telnet tftp
+Features: AsynchDNS IPv6 Largefile GSS-API Kerberos SPNEGO NTLM NTLM_WB SSL libz TLS-SRP HTTP2 UnixSockets HTTPS-proxy PSL"
+
+CURL_VERSION_ON_ARCHLINUX_WITHOUT_LIBZ="curl 7.54.0 (x86_64-pc-linux-gnu) libcurl/7.54.0 OpenSSL/1.1.0f zlib/1.2.11 libpsl/0.17.0 (+libicu/59.1) libssh2/1.8.0 nghttp2/1.22.0
+Protocols: dict file ftp ftps gopher http https imap imaps pop3 pop3s rtsp scp sftp smb smbs smtp smtps telnet tftp
+Features: AsynchDNS IPv6 Largefile GSS-API Kerberos SPNEGO NTLM NTLM_WB SSL TLS-SRP HTTP2 UnixSockets HTTPS-proxy PSL"
+
+CURL_VERSION_ON_CENTOS6_WITH_LIBZ="curl 7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.19.1 Basic ECC zlib/1.2.3 libidn/1.18 libssh2/1.4.2
+Protocols: tftp ftp telnet dict ldap ldaps http file https ftps scp sftp
+Features: GSS-Negotiate IDN IPv6 Largefile NTLM SSL libz"
+
+VERSION_MESSAGE="${CURL_VERSION_ON_ARCHLINUX_WITH_LIBZ}"
+nvm_curl_use_compression || die "nvm_curl_use_compression should return 0"
+
+VERSION_MESSAGE="${CURL_VERSION_ON_ARCHLINUX_WITHOUT_LIBZ}"
+! nvm_curl_use_compression || die "nvm_curl_use_compression should return 1 without libz support"
+
+VERSION_MESSAGE="${CURL_VERSION_ON_CENTOS6_WITH_LIBZ}"
+! nvm_curl_use_compression || die "nvm_curl_use_compression should return 1 when curl < 7.21.0"
+
+cleanup

test/fast/Unit tests/nvm_curl_version

@@ -0,0 +1,32 @@
+#!/bin/sh
+
+cleanup () {
+  unset -f die
+  unset -f curl
+}
+
+die () { echo -e "$@" ; cleanup ;  exit 1; }
+
+NVM_ENV=testing \. ../../../nvm.sh
+
+curl() {
+  if [ "$1" = "-V" ]; then
+    echo "${VERSION_MESSAGE}"
+  fi
+}
+
+assert_version_is() {
+  if [ "${1}" != "${2}" ]; then
+    die "Expected ${2}, got ${1}, origin version message:\n${VERSION_MESSAGE}"
+    return 1
+  fi
+}
+
+CURL_VERSION_MESSAGE="curl 7.54.0 (x86_64-pc-linux-gnu) libcurl/7.54.0 OpenSSL/1.1.0f zlib/1.2.11 libpsl/0.17.0 (+libicu/59.1) libssh2/1.8.0 nghttp2/1.22.0
+Protocols: dict file ftp ftps gopher http https imap imaps pop3 pop3s rtsp scp sftp smb smbs smtp smtps telnet tftp
+Features: AsynchDNS IPv6 Largefile GSS-API Kerberos SPNEGO NTLM NTLM_WB SSL libz TLS-SRP HTTP2 UnixSockets HTTPS-proxy PSL"
+
+VERSION_MESSAGE="${CURL_VERSION_MESSAGE}"
+assert_version_is "$(nvm_curl_version)" "7.54.0"
+
+cleanup