The makefiles scripts create a variable with all the go files
that are part of the Kubernetes source tree, including staging.
As today, this variable has a size of < 100kb
wc .make/all_go_dirs.mk
2326 2326 98905 .make/all_go_dirs.mk
This variable is passed as argument in the Makefiles, where it
is expanded. In Linux, there is a limit to the max size of
the arguments MAX_ARG_STRLEN.
If the arguments go above 128k, you get a nice:
execvp: /usr/bin/env: Argument list too long
If you, for whatever reason, do some go mod vendor inside the
hack/tools folder, these files will be added to the variable
and most probably you'll go above the limit and get that error.
Then, you'll learn a lot about Makefils, shell expansion, strace,
execpve, ARG_MAX and MAX_ARG_STRLEN,until you realize what is
the real problem :).
Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.
Update all script shebangs to use /usr/bin/env interpreter instead of /bin/interpreter
This is required to support systems where bash doesn't reside in /bin (such as NixOS, or the *BSD family) and allow users to specify a different interpreter version through $PATH manipulation.
https://www.cyberciti.biz/tips/finding-bash-perl-python-portably-using-env.html
```release-note
Use /usr/bin/env in all script shebangs to increase portability.
```
Don't revert, change boundingdirs in Makefile for deepcopy-gen
manually fix pkg/client/clientset_generated/clientset/typed/core/v1/pod_expansion.go because external policy types are moved now
Lots of places used sort (or sort -u) but didn't set LC_ALL=C. This
means it could be slightly different on different people's systems. Make
it deterministic.
This operation takes 2-5 seconds on every build, but doesn't actually need to
run most of the time. Now we cache it and see if it needs a rebuild (fast)
before actually rebuilding (slow).
