Support features with "pub global activate".

Partially addresses #1593

This more clearly indicates the type of data the class contains. We
were already using in more places than just dependencies, so it makes
sense to have a name that reflects that.

These classes are largely independent of the Package class.

Closes #1539

Throws UnimplementedError if passing dartdevc today

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

See #1473
See #1477

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 .

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 allows PackageName equality to include description equality, and it
substantially cleans up other logic dealing with sources.

See #912

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//2079303003 .

This splits Source into two classes, Source and LiveSource. The former
is completely independent of the system cache directory, and mostly
contains source metadata and logic about manipulating descriptions.

SourceRegistry now deals strictly in Sources, with LiveSources being
handled by SystemCache. This means that classes like Pubspec and
LockFile no longer have transitive references to the system cache
directory.

This will also make it possible to clean up PackageName equality logic
by making PackageNames track their concrete Sources rather than just
their source names.

See #912

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//2044253003 .

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//1585513002 .

This considers the lockfile stale if the intersection of all selected
packages' SDK constraints don't match the current SDK, or if it contains
a path dependency whose own dependencies don't match the lockfile.

Closes #1091
Closes #1101

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//1534093002 .

This folds the distinction between "resolved" and "unresolved"
descriptions into the distinction between PackageIds and PackageRefs. In
other words, all PackageIds now have resolved descriptions and all
PackageRefs now have unresolved descriptions. This makes it easier to
track which descriptions are resolved and express resolution constraints
via the type system.

This also restricts the creation of PackageRefs and PackageIds to source
classes, which helps ensure that the description format—which is an
implementation detail—doesn't leak into surrounding code.

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//1528523003 .

Previously, "pub global run" would happily try to run an executable with
an SDK constraint that doesn't match the current SDK, even though it
probably wouldn't work (and could fail in confusing ways). Now it errors
out with a user-friendly message instead.

Closes #1353

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//1427523005 .

When we tried to run a global script that didn't exist, we would try to
load an AssetEnvironment, which would try to compute the transformers
for it. Because the script doesn't exist, the computation would
conservatively assume that all transformers had to run in case one of
them generated it.

To find all the scripts, it iterated through the package's dependencies.
Since it's notionally the entrypoint, it tried to include its dev
dependencies, but this broke because dev dependencies aren't installed
for globally-activated packages.

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//1413713010 .

We were assuming that all globally-activated packages have a .packages
file, but this isn't true for packages that were activated by earlier
versions of pub.

Closes #1316

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//1292003005 .

Previously, several commands automatically ran "pub get" implicitly before doing
their work. We've determined that this behavior is confusing, and for "pub run"
in particular, makes the executables seem much slower than they actually are.

This also allows us to make access to the entrypoint's package graph
synchronous.

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//1282533003 .

The spec doesn't actually need all the data loaded from the package
graph; all it needs are the locations of packages which can be looked up
using their IDs and a SourceRegistry.

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//1282083002 .

This also has it store its SourceRegistry, so that various methods don't
need to re-supply it.

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//1281043004 .

It never really made sense for this to be asynchronous; most sources
didn't even do any IO to determine the directory. The only exception was
the git source, which would actually *clone a repository* if one didn't
exist yet. This heavyweight behavior wasn't a good fit for what looks
like a lightweight method anyway.

Making this synchronous has a ripple effect of making a bunch of other
methods synchronous, too. Hooray for synchrony!

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//1276673006 .

Closes pub#22

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//1277773002 .

Fixes #1230.

R=nweiz@google.com

Review URL: https://codereview.chromium.org//1272813003 .

Closes #1304

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//1248483003 .

Now instead of just saying how many packages failed to be
reinstalled/reactivated, "pub cache repair" will print a list of those
packages.

This also fixes an issue where "pub cache repair" would incorrectly
return a 0 exit code when packages failed to reactivate.

Closes #1301

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//1239623005 .

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//1101343004

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@45508 260f80e4-7a28-3924-810f-c04153c831b5

R=rnystrom@google.com
BUG=22076

Review URL: https://codereview.chromium.org//899373002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@43737 260f80e4-7a28-3924-810f-c04153c831b5

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//868463003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@43057 260f80e4-7a28-3924-810f-c04153c831b5

Previously, binstubs used [[ ]], which is a bash-specific construct.

R=rnystrom@google.com
BUG=21854

Review URL: https://codereview.chromium.org//800733003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@42308 260f80e4-7a28-3924-810f-c04153c831b5

BUG=
R=ricow@google.com

Review URL: https://codereview.chromium.org//753063003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@42063 260f80e4-7a28-3924-810f-c04153c831b5

This also makes "pub cache repair" repair activated packages, including updating
the binstub format.

R=rnystrom@google.com
BUG=21463

Review URL: https://codereview.chromium.org//745153002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@42055 260f80e4-7a28-3924-810f-c04153c831b5

R=nweiz@google.com

Review URL: https://codereview.chromium.org//602253002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@40849 260f80e4-7a28-3924-810f-c04153c831b5

Review URL: https://codereview.chromium.org//599343003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@40667 260f80e4-7a28-3924-810f-c04153c831b5

TBR.

Review URL: https://codereview.chromium.org//600313002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@40666 260f80e4-7a28-3924-810f-c04153c831b5

R=rnystrom@google.com
TBR

Review URL: https://codereview.chromium.org//601973002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@40664 260f80e4-7a28-3924-810f-c04153c831b5

R=nweiz@google.com

Review URL: https://codereview.chromium.org//601933002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@40662 260f80e4-7a28-3924-810f-c04153c831b5

A package's executables may not use all of that package's transformers. This is
especially true for browser frameworks where there's a clear divide between
client-side and server-side code. This uses pub's existing dependency-sniffing
infrastructure to figure out which transformers can be omitted.

This takes "pub run polymer:new_element --help" from 1.52s to 0.96s.

R=rnystrom@google.com
BUG=20859

Review URL: https://codereview.chromium.org//599993004

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@40659 260f80e4-7a28-3924-810f-c04153c831b5

BUG=
R=rnystrom@google.com

Review URL: https://codereview.chromium.org//600583003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@40643 260f80e4-7a28-3924-810f-c04153c831b5