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epriestley 426d648681 In Drydock, don't reset current branch to point at unrelated commit
Summary:
Fixes T10037. When we're building commit `aabbccdd`, we currently do this to check it out:

  git reset --hard aabbccdd

However, this has an undesirable side effect of moving the current branch pointer to point at `aabbccdd`. The current branch pointer may be some totally different branch which `aabbccdd` is not part of, so this is confusing and misleading.

Instead, use `git reset --hard HEAD` to get the primary effect we want (destroying staged changes) and then `git checkout aabbccdd` to checkout the commit in a detached HEAD state.

Test Plan:
  - Ran a build (a commit-focused operation) successfully.
  - Verified working copy was pointed at a detached HEAD afterward:

```
builder@sbuild001:/var/drydock/workingcopy-167/repo/git-test-ii$ git status
HEAD detached at ffc7635
nothing to commit, working directory clean
```

  - Ran a land (a branch-foused operation) successfully.
  - Verified working copy was pointed at a branch afterward:

```
builder@sbuild001:/core/data/drydock/workingcopy-168/repo/git-test$ git status
On branch master
Your branch is up-to-date with 'origin/master'.

nothing to commit, working directory clean
```

Reviewers: chad

Reviewed By: chad

Subscribers: yelirekim

Maniphest Tasks: T10037

Differential Revision: https://secure.phabricator.com/D14850
2015-12-22 06:47:47 -08:00
bin Provide bin/garbage for interacting with garbage collection 2015-10-02 09:17:24 -07:00
conf Mark some strings for translation 2015-06-09 23:06:52 +10:00
externals Remove skins from Phame 2015-12-11 08:14:12 -08:00
resources Allow index extensions to skip indexing if the object has not changed 2015-12-21 17:27:14 -08:00
scripts Add a lock to storage upgrade and adjustment 2015-12-02 06:18:28 +11:00
src In Drydock, don't reset current branch to point at unrelated commit 2015-12-22 06:47:47 -08:00
support Add a "Startup" to DarkConsole 2015-08-21 14:53:29 -07:00
webroot Add more NUX states 2015-12-21 11:15:54 -08:00
.arcconfig Use the configuration driven unit test engine 2015-08-11 07:57:11 +10:00
.arclint Apply phutil XHPAST linter standard 2015-11-13 07:09:12 +11:00
.arcunit Use the configuration driven unit test engine 2015-08-11 07:57:11 +10:00
.editorconfig Fix text lint issues 2015-02-12 07:00:13 +11:00
.gitignore Add custom Cows and Figlet directories to .gitignore 2015-10-08 20:23:05 -07:00
LICENSE Fix text lint issues 2015-02-12 07:00:13 +11:00
NOTICE Update Phabricator NOTICE file to reflect modern legal circumstances 2014-06-25 13:42:13 -07:00
README.md Remove push to IRC from "readme.md" too 2015-10-24 18:39:16 -07:00

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