From 7eca29daeee6b583f5394a45d8edfd41c15dbe6d Mon Sep 17 00:00:00 2001
From: Karl Gustav <kkgg84+git@gmail.com>
Date: Sat, 25 Jan 2020 20:43:37 +0100
Subject: [PATCH] Fix install_kustomize.sh so it works on alpine linux

The install script fails and thinks that alpine linux is in windows. This is because
`$OSTYPE` in alpine linux is linux-musl, not linux-gnu as this script assumes.

I tested these changes with this script:
```

set -euo pipefail

opsys=""
function check {
    opsys=windows
    if [[ "$OSTYPE" == linux* ]]; then
      opsys=linux
    elif [[ "$OSTYPE" == darwin* ]]; then
      opsys=darwin
    fi
}

OSTYPE="linux-gnu"
check
test "$opsys" == "linux" || echo $OSTYPE test failed

OSTYPE="linuxsomething"
check
test "$opsys" == "linux" || echo $OSTYPE test failed

OSTYPE="darwinsomething"
check
test "$opsys" == "darwin" || echo $OSTYPE test failed

OSTYPE="either"
check
test "$opsys" == "windows" || echo $OSTYPE test failed
```

ref: #2146
---
 hack/install_kustomize.sh | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/hack/install_kustomize.sh b/hack/install_kustomize.sh
index e17a317fc..6e152d6dc 100755
--- a/hack/install_kustomize.sh
+++ b/hack/install_kustomize.sh
@@ -26,9 +26,9 @@ trap cleanup EXIT
 pushd $tmpDir >& /dev/null
 
 opsys=windows
-if [[ "$OSTYPE" == "linux-gnu" ]]; then
+if [[ "$OSTYPE" == linux* ]]; then
   opsys=linux
-elif [[ "$OSTYPE" == "darwin"* ]]; then
+elif [[ "$OSTYPE" == darwin* ]]; then
   opsys=darwin
 fi