determine_haiku_revision: Properly get rid of the commit hash.

Change-Id: I3f57b1cd4d819e7f531001d747bf7b103954a918
Reviewed-on: https://review.haiku-os.org/581
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

determine_haiku_revision: Rework "no tag on HEAD" output.

When HEAD is tagged, the output will be identical to what it was
before (the latest hrev tag and nothing else.) When HEAD is not tagged,
and the most recent tag is further back, we now use a format like this:

hrevXXXXX+N(+dirty)

... where N is the number of commits since hrevXXXXX, and +dirty is added
if the working tree is dirty. This is significantly shorter than the
previous model (as it does not have the Git revision.)

Fixes #14445.

Change-Id: Ide7f66cf0ac1c1f05402afc52b6be3b68b66d6dc
Reviewed-on: https://review.haiku-os.org/566
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

Improve handling of Haiku clone without any tags.

* Error out early with a hint about how to solve the problem (by setting
HAIKU_REVISION explicitly).

Rework rule CopySetHaikuRevision

* Remove support for VCSs other than git.
* Make the haiku-revision file a regular build target and make sure it
is built only once.
* Make determine_haiku_revision an actual shell script and simplify
it a bit.

If can't find hrev tags set the version to the short hash

If no hrev tags are found the revision is blank and shows up as
0 in About System. This commit updates the revision function so that
it falls back to the current short hash instead. Only affects devel
builds and only if you've deleted your tags.

Simplify haiku-revision for git, now that we provide revision-tags in our central git repo:
* instead of describing the changeset from perspective of the current branch's root,
we describe it relative to the last reachable hrev-tag


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@41979 a95241bf-73f2-0310-859d-f6bbb57e9c96

Replace the $(...) syntax with backticks instead.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@41721 a95241bf-73f2-0310-859d-f6bbb57e9c96

Use gsed instead of sed on Mac OS X as the builtin sed doesn't support all the
options we need. This still requires gsed to be installed from ports.
Fixes #7563.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@41719 a95241bf-73f2-0310-859d-f6bbb57e9c96

Adjusted code for determining the revision in order to hopefully work on FreeBSD, too
* convert determine_haiku_revision to only contain functions and now pass the arguments
via function call


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@41539 a95241bf-73f2-0310-859d-f6bbb57e9c96

Fix and improve code for determining Haiku revision from a git repo
* break out most of the CopySetHaikuRevision action into a separate script:
determine_haiku_revision
* fix git branch detection such that it'll actually work for local branches (thanks to
Andreas Färber for the hint)
* add some sanity checks


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@41520 a95241bf-73f2-0310-859d-f6bbb57e9c96

Improve handling of Haiku clone without any tags.

* Error out early with a hint about how to solve the problem (by setting
HAIKU_REVISION explicitly).

Rework rule CopySetHaikuRevision

* Remove support for VCSs other than git.
* Make the haiku-revision file a regular build target and make sure it
is built only once.
* Make determine_haiku_revision an actual shell script and simplify
it a bit.

If can't find hrev tags set the version to the short hash

If no hrev tags are found the revision is blank and shows up as
0 in About System. This commit updates the revision function so that
it falls back to the current short hash instead. Only affects devel
builds and only if you've deleted your tags.

Simplify haiku-revision for git, now that we provide revision-tags in our central git repo:
* instead of describing the changeset from perspective of the current branch's root,
we describe it relative to the last reachable hrev-tag


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@41979 a95241bf-73f2-0310-859d-f6bbb57e9c96

Replace the $(...) syntax with backticks instead.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@41721 a95241bf-73f2-0310-859d-f6bbb57e9c96

Use gsed instead of sed on Mac OS X as the builtin sed doesn't support all the
options we need. This still requires gsed to be installed from ports.
Fixes #7563.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@41719 a95241bf-73f2-0310-859d-f6bbb57e9c96

Adjusted code for determining the revision in order to hopefully work on FreeBSD, too
* convert determine_haiku_revision to only contain functions and now pass the arguments
via function call


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@41539 a95241bf-73f2-0310-859d-f6bbb57e9c96

Fix and improve code for determining Haiku revision from a git repo
* break out most of the CopySetHaikuRevision action into a separate script:
determine_haiku_revision
* fix git branch detection such that it'll actually work for local branches (thanks to
Andreas Färber for the hint)
* add some sanity checks


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@41520 a95241bf-73f2-0310-859d-f6bbb57e9c96