Doesn't install on arm64

[nicholaswilde]

I tried using krew using the script from the installation documentation on an RPi4.

(
  set -x; cd "$(mktemp -d)" &&
  curl -fsSLO "https://github.com/kubernetes-sigs/krew/releases/latest/download/krew.tar.gz" &&
  tar zxvf krew.tar.gz &&
  KREW=./krew-"$(uname | tr '[:upper:]' '[:lower:]')_$(uname -m | sed -e 's/x86_64/amd64/' -e 's/arm.*$/arm/')" &&
  "$KREW" install krew
)

Output

++ mktemp -d
+ cd /tmp/tmp.DXwzAkWdyQ
+ curl -fsSLO https://github.com/kubernetes-sigs/krew/releases/latest/download/krew.tar.gz
+ tar zxvf krew.tar.gz
./LICENSE
./krew-darwin_amd64
./krew-linux_amd64
./krew-linux_arm
./krew-windows_amd64.exe
++ uname
++ tr '[:upper:]' '[:lower:]'
++ uname -m
++ sed -e s/x86_64/amd64/ -e 's/arm.*$/arm/'
+ KREW=./krew-linux_aarch64
+ ./krew-linux_aarch64 install krew
bash: ./krew-linux_aarch64: No such file or directory

I know that there isn't an arm64/aarch64 executable in the release packages, but it does seem to work by manually running ./krew-linux_arm install krew

$ cat /etc/os-release 
PRETTY_NAME="Debian GNU/Linux 10 (buster)"
NAME="Debian GNU/Linux"
VERSION_ID="10"
VERSION="10 (buster)"
VERSION_CODENAME=buster
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"

$ uname -a
Linux pi-04 5.4.72-v8+ #1356 SMP PREEMPT Thu Oct 22 13:58:52 BST 2020 aarch64 GNU/Linux

[ahmetb]

I suspect we need to throw another -e 's/aarch64/arm/' in the sed command there.

[ahmetb]

/kind bug
/priority p2
/area distribution

[ahmetb]

So the sed command mentioned above works, but this has unrevealed another bug.

On an arm64 environment (per go env GOARCH), Krew successfully installs plugins with selector arch: arm however it doesn't install plugins with arch: arm64. So I suspect there's something wrong with how we interpret os/arch pairs on arm64 specifically.

Opening #688 to track.