Dynamically calculating envar: My company uses GAR artifact repository where my company hosts packages(python wheels). Primarily google recommends using

keyrings

to authenticate to GAR's https://cloud.google.com/artifact-registry/docs/python/store-python#configure However pants doesn't support keyring. I also tried. adding

keyring

to

PATH

but that didn't work. i have another workaround though,

[python-repos]
indexes.add = [
  "<https://oauth2accesstoken>:%(env.GOOGLE_ACCESS_TOKEN)s@us-central1-python.pkg.dev/<project>/<repository>/simple",
]

however it needs google auth token, and the way i can generate these token is

gcloud auth print-access-token

which have a ttl of 5min(or so). So currently i have to run all pants related commands like

GOOGLE_ACCESS_TOKEN="$(gcloud auth print-access-token)" pants check ::

or

GOOGLE_ACCESS_TOKEN="$(gcloud auth print-access-token)" pants generate-lockfiles

. is it possible to have this

GOOGLE_ACCESS_TOKEN

also computed dynamically by

pants

itself ? maybe by definiting this as an

alias

?

Hi, the builtin alias support in pants is merely string substitution, so doesn’t lend itself to dynamic values. What you can do however, is use a

.pants.bootstrap

script:

export GOOGLE_ACCESS_TOKEN="$(gcloud auth print-access-token)"

that worked. Thanks @curved-television-6568 is there a document or link where i can find about

.pants.bootstrap

. ? I see

python-bootstrap

but not

.pants.bootstrap

It’s not mentioned in the regular docs, I believe, so it’s a little known well hidden gem, briefly presented here: https://github.com/pantsbuild/pants/discussions/17633

this is great. super useful, thanks.