Clarify error messages in roll_dep.py

Clarify error messages in roll_dep.py

If you specify a directory incorrectly to roll_dep then it may not be
obvious why it cannot be found. For instance, "roll-dep tools\gyp" vs.
"roll-dep src\tools\gyp". This change prints the full directory.

This change also clarifies what is meant by a clean tree to make that
error message easier to understand.

R=maruel@chromium.org

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=297875

[brucedawson, 2015-12-07 21:04:05]

While using roll-dep I got confused by both of these error messages. This change
tweaks them to avoid confusing me in the future.

Thoughts?

[M-A Ruel, 2015-12-07 21:15:50]

The CQ bit was checked by maruel@chromium.org

[M-A Ruel, 2015-12-07 21:15:51]

lgtm

Good idea.

[commit-bot: I haz the power, 2015-12-07 21:15:57]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1507623003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1507623003/1

[commit-bot: I haz the power, 2015-12-07 21:46:42]

Description was changed from

==========
Clarify error messages in roll_dep.py

If you specify a directory incorrectly to roll_dep then it may not be
obvious why it cannot be found. For instance, "roll-dep tools\gyp" vs.
"roll-dep src\tools\gyp". This change prints the full directory.

This change also clarifies what is meant by a clean tree to make that
error message easier to understand.

R=maruel@chromium.org
==========

to

==========
Clarify error messages in roll_dep.py

If you specify a directory incorrectly to roll_dep then it may not be
obvious why it cannot be found. For instance, "roll-dep tools\gyp" vs.
"roll-dep src\tools\gyp". This change prints the full directory.

This change also clarifies what is meant by a clean tree to make that
error message easier to understand.

R=maruel@chromium.org

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=297875
==========

[commit-bot: I haz the power, 2015-12-07 21:46:42]

Committed patchset #1 (id:1) as
http://src.chromium.org/viewvc/chrome?view=rev&revision=297875