hooks/pre-auto-gc: look in sysfs to see if a battery is known.

Barring any kernel bugs, if this directory exists and there is
a symlink in there (which will point to the battery object),
that means there is a battery known to the kernel.

No symlink should mean no battery as far as the kernel is concerned.

Change-Id: Ib12819a5bbb816f0ae5ca080e5812a2db08441e9
Pass http_proxy as -c http.proxy on Mac OS X

The system libcurl library seems to ignore http_proxy on Mac OS
X systems. Copy the http_proxy environment variable (if set) as
`git -c http.proxy` whenever running a Git command.

Change-Id: I0ab29336897178f70b85092601f9fcc306dd17e1
Detect git is not installed

Fix detection for Git not being in $PATH during the initial
run of `repo init` in a new directory.

Change-Id: I2b1fcce1fb8afc47271f5c3bd2a28369009b2fb7
Use gerrit.googlesource.com/git-repo as the default URL

This is basically the same repository, but may be slightly more
up-to-date than the one on code.google.com/p/git-repo.

Change-Id: I5c99539f53231958eefb6993f00997c9adf0a3c9
repo: Add option review.URL.uploadtopic support

This patch adds the option to include topic branches by adding the
following to a .gitconfig file:

    uploadtopic = true

This option is only read in when the -t option is not already
specified at the command line.

Change-Id: I0e0eea49438bb4e4a21c2ac5bd498b68b5a9a845
Use GIT_CONFIG_PARAMETERS instead of -c for http.proxy

Ancient versions of Git don't understand the -c command line flag
that we tried to use to pass http_proxy down into Git on Darwin.
Use the environment variable instead, to more gracefully degrade
with these old versions.

Change-Id: Iffffa32088c1fd803895b990b3377ecfec6a1b14
Restore include support.

Calculation of where the include file lives was broken by 23acdd3f14
since it resulted in looking for the first include in .repo, rather
than .repo/manifests.

While people can work around it via setting their includes to
manifests/<include-target>, that breaks down since each layer of
includes would then have to be relative.

As such, restore the behaviour back to 2644874d; manifests includes
are calculated relative to the manifest root (ie, .repo/manifests);
local manifests includes are calculated relative to .repo/ .

Change-Id: I74c19ba614c41d2f08cd3e9fd094f3c510e3bfd1
Fix switching manifest branches using repo init -b

See repo issue #46 :
	https://code.google.com/p/git-repo/issues/detail?id=46

When using repo init -b on an already existing repository,
the next sync will try to rebase changes coming from the old manifest
branch onto the new, leading in the best case scenario to conflicts
and in the worst case scenario to an incorrect "mixed up" manifest.

This patch fixes this by deleting the "default" branch in the local
manifest repository when the -d init switch is used, thus forcing
repo to perform a fresh checkout of the new manifest branch

Change-Id: I379e4875ec5357d8614d1197b6afbe58f9606751
Support automatically stashing local modifications during repo-rebase.

Currently repo-rebase requires that all modifications be committed
locally before it will allow the rebase. In high-velocity environments,
you may want to just pull in newer code without explicitly creating
local commits, which is typically achieved using git-stash.

If called with the --auto-stash command line argument, and it is
determined that the current index is dirty, the local modifications
are stashed, and the rebase continues.  If a stash was performed, that
stash is popped once the rebase completes.

Note that there is still a possibility that the git-stash pop will
result in a merge conflict.

Change-Id: Ibe3da96f0b4486cb7ce8d040639187e26501f6af
Detach branch even when already on the latest revision using sync -d

This patch fixes repo behaviour when running sync -d with unmodified
topic branches.

Prior to this patch sync -d would see the latest revision is already
checked out, thus staying on the branch. Since "-d" means detach we
should follow git's behaviour and actually detach from the branch in
that case.

Basic test case - after a fresh repo init + sync -
        * repo start --all testdetach
        * repo sync -d
        * repo status
-> status shows active topic branch "testdetach",
   should show :
nothing to commit (working directory clean)

Change-Id: Ic1351e6b5721b76557a51ab09f9dd42c38a4b415
Single quote http.proxy in GIT_CONFIG_PARAMETERS

Git requires the values in this environment variable to be
single quoted. repo must wrap the expression into '' before
adding it to the environment.

Change-Id: I20a1fb8772f9aa6e9fd5a0516c981c2ca020ef05