go/src/all.bash: Mac OS X TMP directory not writable

[odysseus9672]

Go version

go version go1.26-devel_dfac972233 Thu Oct 23 14:44:03 2025 -0700 darwin/arm64

Output of go env in your module/workspace:

go env
go: creating work dir: mkdir /var/folders/zz/zyxvpxvq6csfxvn_n0000000000000/T/go-build4233801866: permission denied

What did you do?

I ran this script on Mac OS X 15.7.1 to update my go install in ~/goLang/go:

#!/usr/bin/env bash
trap 'echo goupdate.sh exited with error; exit 1;' ERR

export GOROOT_BOOTSTRAP=$HOME/golang/go1.25.0
export OLDGOMAXPROCS=$GOMAXPROCS
export GOMAXPROCS=8

curdir=`pwd`
cd $HOME/golang/go/src
git fetch
#git checkout master
git -c pull.rebase=false pull
./all.bash
#./sudo.bash
cd $curdir

export GOMAXPROCS=$OLDGOMAXPROCS
unset OLDGOMAXPROCS
unset GOROOT_BOOTSTRAP

What did you see happen?

I get this output:

Already up to date.
Building Go cmd/dist using /Users/sean/golang/go1.25.0. (go1.25.0 darwin/arm64)
go: creating work dir: mkdir /var/folders/zz/zyxvpxvq6csfxvn_n0000000000000/T/go-build3639827534: permission denied
goupdate.sh exited with error

What did you expect to see?

The build and test process from running all.bash.

[seankhliao]

This looks like a problem local to your machine, if something is denying the ability to write into tmp.

[odysseus9672]

So, if all.bash isn't the script to compile go from source on OS X, what is?

For what it's worth, it may be hallucinating, but ChatGPT thinks that this is caused by active changes in how Apple manages temp directory protection.
https://chatgpt.com/share/69001024-9140-800f-a7f2-b56faedb827f

[seankhliao]

you need a usable temporary directory, why yours is broken is out of scope for the Go project.

[odysseus9672]

For future searchers: updating to Mac OS X 15.7.2 fixed the issue.

[khanakia]

@odysseus9672 you saved my day 🙌