In the Linux portion of drake_cmake_installed/setup/install_prereqs, the same maybe_sudo logic should be applied.

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drake_bazel_external/.github/setup line 6 at r1 (raw file):

set -euxo pipefail

maybe_sudo=

All of the files in the .github subdirectories are only called by CI. We control the CI environment so don't need to do the maybe_sudo check.

Fixed.

Reviewable status: 1 unresolved discussion, LGTM missing from assignee betsymcphail, platform LGTM missing (waiting on @BetsyMcPhail)

drake_bazel_external/.github/setup line 6 at r1 (raw file):

Fixed.

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drake_cmake_installed/setup/install_prereqs line 92 at r2 (raw file):

echo -e "\ndrake VERSION.TXT: $(cat /opt/drake/share/doc/drake/VERSION.TXT)\n"

/opt/drake/share/drake/setup/install_prereqs

When this is run locally, does this require sudo on Ubuntu?

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drake_cmake_installed/setup/install_prereqs line 92 at r2 (raw file):

I should have been more clear. I believe this will require sudo on Ubuntu but NOT on Mac. This PR needs a rebase after the /opt changes, which may make the changes in this file more clear.

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+@jwnimmer-tri - would you prefer to platform review this or assign it to the on-call reviewer?

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modulo open discussions.

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drake_cmake_installed/setup/install_prereqs line 6 at r4 (raw file):

# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without

BTW Yuck, I guess I missed this file in #361.

I just went back through the history of this file and the only non-relicenseable commit in its ancestry was #181, and I'll say it's been sufficiently rewritten since then that the commit is no longer relevant.

So either in this PR, or in a separate one, please delete this license text and replace with our standard SPDX MIT-0 line.

drake_cmake_installed/setup/install_prereqs line 41 at r4 (raw file):

      exit 1
    fi
    maybe_sudo= # assign empty for later call to install source prereqs

It seems to me like assigning the empty string should happen prior to the case ... beginning, since we need it to be defined no matter which branch was taken.

drake_cmake_installed/setup/install_prereqs line 76 at r4 (raw file):

    tar -xf drake.tar.gz -C $HOME

    ${maybe_sudo} apt-get update

nit This line is (was) redundant. We already apt-updated on line 56, above.

drake_cmake_installed/setup/install_prereqs line 88 at r4 (raw file):

# Install the source prereqs
${maybe_sudo} ${HOME}/drake/share/drake/setup/install_prereqs

See https://drake.mit.edu/from_source.html#building-with-cmake.

This command has bitrotted (no longer matches our documentation). The correct command is drake/setup/install_prereqs (without sudo).

drake_cmake_external/setup/install_prereqs line 26 at r4 (raw file):

# Install the source prereqs
${maybe_sudo} drake-master/setup/ubuntu/install_prereqs.sh

See https://drake.mit.edu/from_source.html#building-with-cmake.

This command has bitrotted (no longer matches our documentation). The correct command is drake/setup/install_prereqs (without sudo).

Reviewable status: 5 unresolved discussions, platform LGTM from [betsymcphail, jwnimmer-tri] (waiting on @jwnimmer-tri and @tyler-yankee)

drake_cmake_external/setup/install_prereqs line 26 at r4 (raw file):

Do the bazel_external and bazel_external_legacy examples need a similar update?

Reviewable status: 5 unresolved discussions, platform LGTM from [betsymcphail, jwnimmer-tri] (waiting on @BetsyMcPhail and @tyler-yankee)

drake_cmake_external/setup/install_prereqs line 26 at r4 (raw file):

Our https://drake.mit.edu/from_source.html section for bazel actually just points to the DEE code as the source of truth, so there isn't any defect with things being out of sync.

I'm thinking to just leave alone the bazel side for now, since it already has some TODOs with bazelisk which I'd rather just all solve at the same time.

Reviewable status: 5 unresolved discussions, platform LGTM from [betsymcphail, jwnimmer-tri] (waiting on @jwnimmer-tri and @tyler-yankee)

drake_cmake_external/setup/install_prereqs line 26 at r4 (raw file):

Sounds good to me.

Reviewable status: 5 unresolved discussions, platform LGTM from [betsymcphail, jwnimmer-tri] (waiting on @jwnimmer-tri)

drake_cmake_external/setup/install_prereqs line 26 at r4 (raw file):

Fixed (and verified locally).

drake_cmake_installed/setup/install_prereqs line 41 at r4 (raw file):

Good catch, this is cleaner; fixed.

drake_cmake_installed/setup/install_prereqs line 76 at r4 (raw file):

Fixed.

drake_cmake_installed/setup/install_prereqs line 88 at r4 (raw file):

Here, install_prereqs gets the latest nightly release of Drake. From the top-level, drake/setup/install_prereqs doesn't exist, and calling drake/share/drake/setup/install_prereqs requires running as root.

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drake_cmake_external/setup/install_prereqs line 26 at r4 (raw file):

I'm okay with de-sync. Or, if doing the same change to the bazel side actually succeeds, I'm okay changing bazel, too. (I only wanted to avoid complicated, novel changes on the bazel side.)

drake_cmake_installed/setup/install_prereqs line 88 at r4 (raw file):

Oops, right, this is cmake_installed not cmake_external. Withdrawn.

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a discussion (no related file):
The Jenkins error looks real.

Part of the problem is that the DEE examples that use bazel need to opt-in to installing it now. The new prereqs script has it off by default ...

https://github.com/RobotLocomotion/drake/blob/73c9b1061301b723481c6798ffc5c389aa1c3965/setup/install_prereqs#L31

... so we need --with-bazel in the DEE install_prereqs script (for the bazel_external only, not for the cmake_external).

The problem with cmake_external is actually a latent but in Drake's setup script. The prefetching ...

https://github.com/RobotLocomotion/drake/blob/73c9b1061301b723481c6798ffc5c389aa1c3965/setup/ubuntu/source_distribution/install_prereqs_user_environment.sh#L25-L27

... should be skipped if we're operating in --without-bazel mode.

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