We used to name these after the package itself, but that makes it
difficult to share repositories between sub-packages.

These classes are largely independent of the Package class.

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

Closes #1479

R=rnystrom@google.com

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

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 .

Closes #1368

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//1555133002 .

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 .

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 .

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
BUG=

Review URL: https://codereview.chromium.org//848363003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@42938 260f80e4-7a28-3924-810f-c04153c831b5

R=rnystrom@google.com
BUG=20947

Review URL: https://codereview.chromium.org//831983005

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@42936 260f80e4-7a28-3924-810f-c04153c831b5

Previously, the binaries were only updated if the version number had
changed. Now they're updated if just the commit changes. This also
improves the output of "pub upgrade" if a git dependency changes its
commit but not its version number.

R=rnystrom@google.com
BUG=21971

Review URL: https://codereview.chromium.org//844263004

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@42883 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=rnystrom@google.com

Review URL: https://codereview.chromium.org//581283003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@40559 260f80e4-7a28-3924-810f-c04153c831b5

BUG=https://code.google.com/p/dart/issues/detail?id=19902
R=nweiz@google.com

Review URL: https://codereview.chromium.org//448933002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@39279 260f80e4-7a28-3924-810f-c04153c831b5

This change does three things:
* Splits out a WrappedException class from ApplicationException.
* Uses fail() pervasively rather than new ApplicationException() everywhere.
* Moves exception classes from utils.dart to exceptions.dart.

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//354663008

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@37713 260f80e4-7a28-3924-810f-c04153c831b5

This is prep work for global packages, which need to ensure their
dependencies are local, but do not want to create symlinks for them.

R=nweiz@google.com

Review URL: https://codereview.chromium.org//357483004

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@37672 260f80e4-7a28-3924-810f-c04153c831b5

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//341643002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@37425 260f80e4-7a28-3924-810f-c04153c831b5

R=rnystrom@google.com
BUG=19067

Review URL: https://codereview.chromium.org//308793016

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@36910 260f80e4-7a28-3924-810f-c04153c831b5

R=nweiz@google.com

Review URL: https://codereview.chromium.org//243683002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@35344 260f80e4-7a28-3924-810f-c04153c831b5

BUG=https://code.google.com/p/dart/issues/detail?id=5391
RELNOTE=Add "pub cache repair" command to re-install cached packages.
R=nweiz@google.com

Review URL: https://codereview.chromium.org//228703006

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@35111 260f80e4-7a28-3924-810f-c04153c831b5

When looking into issue 17854, I noticed that when installing without a locked
git revision, "pub get" was running "git fetch" over and over again on the same
repository. This avoids doing so and increases the speed of "pub get" with git
repositories considerably.

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//221733002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@34671 260f80e4-7a28-3924-810f-c04153c831b5

R=rnystrom@google.com
BUG=

Review URL: https://codereview.chromium.org//221713003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@34630 260f80e4-7a28-3924-810f-c04153c831b5

R=rnystrom@google.com
BUG=17854
RELNOTE=Don't fetch git repository unnecessarily when running "pub get".

Review URL: https://codereview.chromium.org//221383002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@34626 260f80e4-7a28-3924-810f-c04153c831b5

Previously, if a git dependency's version was locked but its repo
wasn't available locally, attempting to download it would crash pub.

This also enhances some logging infrastructure around git and other
processes.

R=alanknight@google.com
BUG=16470

Review URL: https://codereview.chromium.org//145633008

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@32264 260f80e4-7a28-3924-810f-c04153c831b5

BUG=https://code.google.com/p/dart/issues/detail?id=12211
R=nweiz@google.com

Review URL: https://codereview.chromium.org//114193010

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@31249 260f80e4-7a28-3924-810f-c04153c831b5

Specifically, when run with "--trace" or "--verbose", pub will capture its stack
chains and report them along with errors. Otherwise it should behave identically
to before.

R=rnystrom@google.com
BUG=8842

Review URL: https://codereview.chromium.org//113453005

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@31176 260f80e4-7a28-3924-810f-c04153c831b5

R=floitsch@google.com, nweiz@google.com, rnystrom@google.com

Review URL: https://codereview.chromium.org//94843002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@30809 260f80e4-7a28-3924-810f-c04153c831b5

Review URL: https://codereview.chromium.org//94593002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@30758 260f80e4-7a28-3924-810f-c04153c831b5

BUG=
R=nweiz@google.com

Review URL: https://codereview.chromium.org//89493002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@30682 260f80e4-7a28-3924-810f-c04153c831b5

BUG=https://code.google.com/p/dart/issues/detail?id=7351
R=nweiz@google.com

Review URL: https://codereview.chromium.org//26284002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@28330 260f80e4-7a28-3924-810f-c04153c831b5

BUG=
R=nweiz@google.com

Review URL: https://codereview.chromium.org//22941002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@26040 260f80e4-7a28-3924-810f-c04153c831b5

R=ajohnsen@google.com

Review URL: https://codereview.chromium.org//18356011

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@24964 260f80e4-7a28-3924-810f-c04153c831b5

R=nweiz@google.com

Review URL: https://codereview.chromium.org//18143002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@24555 260f80e4-7a28-3924-810f-c04153c831b5