We had previously been running executables in sub-processes, which made
it difficult to ensure that those executables handled signals and
standard IO properly, and impossible to give them an accurate view of
the environment (for example via Stdout.hasTerminal).

Closes #1204

It seems like dart-lang/sdk#12617 got fixed at some point.

When writing to a symlinked file using dart:io, it defaults to
overwriting the contents of the target rather than replacing the
symlink. This is never what we want, so this works around the behavior
in our IO wrappers.

Closes #1493

Pub no longer outputs the "Loading source assets..." line in this case.

The test is failing on the buildbots, and locally.

This also changes tar creation on Linux to use "pub" as the user/group
rather than the ID 0, so people don't accidentally end up manually
extracting files with root ownership.

Closes #1442

3fa5df4d added new flags between the
"--directory" flag and the directory in question, which broke untarring.

In particular, "pub get --offline" and "pub cache repair" shouldn't
choke when there are parse failures in the version cache.

Closes #1479

Closes #1482.

Avoid barback for global operations.

Add two flags to `tar` invocation that will provide consistent behavior whether `pub` is executed as root or a normal user.

Closes #1486 

Closes #1477

Similarly 98ecbded, this provides better
error messages and faster installation times.

See #1473
See #1477

Previously we were always loading an AssetEnvironment when we
precompiled any executable. Now we only load that environment if some
package dependended on by some executable actually uses a transformer.
Otherwise, we precompile from disk. The new approach is substantially
faster and produces better error messages.

Closes #1473

Where /var/ is really /private/var/

Test package APIs rather than resource APIs.

Closes #1446

The actual change itself is tiny. However, almost all of pub's existing
integration tests validated the correct output by looking at the
contents of the generated "packages" dirs. :(

I fixed most of those to instead validate against the .packages file.

I didn't change the Git ones because the .packages files end up
containing paths that point to specific Git commits. Getting that
working felt like more work than it was worth right now.

When we fully remove support for packages directories, we'll want to
fix that.

Fix #1450.

R=nweiz@google.com

Review URL: https://codereview.chromium.org//2377063002 .

Closes #1118
Closes #1448

Rather than resetting the entire line each time with \r, just erase the
time.

BUG=https://github.com/dart-lang/pub/issues/1446
R=rnystrom@google.com

Review URL: https://codereview.chromium.org/2357263002 .

This allows packages that override only dev dependencies to be
published.

Closes #1444

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//2276143002 .

When a dependency is overridden, any dependency it has back on the root
package is now ignored. This makes it easier for users to develop one
portion of a circular dependency.

Closes #1443

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//2276943003 .

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//2256623003 .

This replaces the hidden --no-package-symlinks flag.

Closes #1340

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//2250643003 .

Fixes #1438

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//2233893004 .

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//2199183002 .

We had started using newer APIs without updating the dependencies
accordingly.

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//2198993003 .

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//2184303002 .

Closes #1430

R=floitsch@google.com, kevmoo@google.com

Review URL: https://codereview.chromium.org//2148413002 .

Currently Flutter is the only supported SDK.

Closes #1431

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//2174913002 .

Packages with Flutter constraints should only be published with SDK
constraints that restrict the SDK to versions that support Flutter
constraints.

Closes #1432

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//2172883002 .

We still need to verify that a Flutter SDK constraint is only
used with an appropriate Dart SDK constraint.

See #1432

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//2165423002 .

This brings these tests in line with others, making them integration
tests that invoke a pub process rather than testing the version solver
APIs directly. This will make it easier to add Flutter support in the
future (see #1431 and #1432).

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//2172523002 .

Change duration formatting in niceDuration