git-drover: Correctly resolve --parent_checkout

git-drover: Correctly resolve --parent_checkout

git rev-parse --git-dir returns a relative path, e.g. ".git". This
should be resolved relative to the cwd of the git command instead of the
current working dir. The cwd of the git command is set to _parent_repo
(=the absolute path after resolving --parent_checkout), so use that.

TEST=The following completes without errors.
$ cd /tmp
$ git init somegitrepo
$ cd somegitrepo
$ git drover --branch [branch] --cherry-pick [hash] -v --dry-run --parent_checkout /path/to/src
$ cd /path/to/src
$ git drover --branch [branch] --cherry-pick [hash] -v --dry-run

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=298416

[robwu, 2016-01-27 13:00:00]

rob@robwu.nl changed reviewers:
+ dpranke@chromium.org

[Dirk Pranke, 2016-01-27 17:58:15]

lgtm

[robwu, 2016-01-27 19:20:10]

The CQ bit was checked by rob@robwu.nl

[commit-bot: I haz the power, 2016-01-27 19:20:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1640233002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1640233002/1

[commit-bot: I haz the power, 2016-01-27 19:22:29]

Description was changed from

==========
git-drover: Correctly resolve --parent_checkout

git rev-parse --git-dir returns a relative path, e.g. ".git". This
should be resolved relative to the cwd of the git command instead of the
current working dir. The cwd of the git command is set to _parent_repo
(=the absolute path after resolving --parent_checkout), so use that.

TEST=The following completes without errors.
$ cd /tmp
$ git init somegitrepo
$ cd somegitrepo
$ git drover --branch [branch] --cherry-pick [hash] -v --dry-run
--parent_checkout /path/to/src
$ cd /path/to/src
$ git drover --branch [branch] --cherry-pick [hash] -v --dry-run
==========

to

==========
git-drover: Correctly resolve --parent_checkout

git rev-parse --git-dir returns a relative path, e.g. ".git". This
should be resolved relative to the cwd of the git command instead of the
current working dir. The cwd of the git command is set to _parent_repo
(=the absolute path after resolving --parent_checkout), so use that.

TEST=The following completes without errors.
$ cd /tmp
$ git init somegitrepo
$ cd somegitrepo
$ git drover --branch [branch] --cherry-pick [hash] -v --dry-run
--parent_checkout /path/to/src
$ cd /path/to/src
$ git drover --branch [branch] --cherry-pick [hash] -v --dry-run

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=298416
==========

[commit-bot: I haz the power, 2016-01-27 19:22:30]

Committed patchset #1 (id:1) as
http://src.chromium.org/viewvc/chrome?view=rev&revision=298416