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[PATCH v3 03/15] python: add VERSION file

From: John Snow
Subject: [PATCH v3 03/15] python: add VERSION file
Date: Tue, 20 Oct 2020 15:35:43 -0400

Python infrastructure as it exists today is not capable reliably of
single-sourcing a package version from a parent directory. The authors
of pip are working to correct this, but as of today this is not possible
to my knowledge.

The problem is that when using pip to build and install a python
package, it copies files over to a temporary directory and performs its
build there. This loses access to any information in the parent
directory, including git itself.

Further, Python versions have a standard (PEP 440) that may or may not
follow QEMU's versioning. In general, it does; but naturally QEMU does
not follow PEP 440. To avoid any automatically-generated conflict, a
manual version file is preferred.

I am proposing:

- Python tooling follows the QEMU version, indirectly, but with a major
  version of 0 to indicate that the API is not expected to be
  stable. This would mean version,,, etc.

- In the event that a Python package needs to be updated independently
  of the QEMU version, a pre-release alpha version should be preferred,
  but *only* after inclusion to the qemu development or stable branches.

  e.g.,, and so on should be preferred prior to
  5.2.0's release.

- The Python core tooling makes absolutely no version compatibility
  checks or constraints. It *may* work with releases of QEMU from the
  past or future, but it is not required to.

  i.e., "qemu.machine" will always remain in lock-step with QEMU.

- We reserve the right to split the qemu package into independently
  versioned subpackages at a later date. This might allow for us to
  begin versioning QMP independently from QEMU at a later date, if
  we so choose.

Implement this versioning scheme by adding a VERSION file and setting it

Signed-off-by: John Snow <jsnow@redhat.com>
 python/VERSION   | 1 +
 python/setup.cfg | 1 +
 2 files changed, 2 insertions(+)
 create mode 100644 python/VERSION

diff --git a/python/VERSION b/python/VERSION
new file mode 100644
index 0000000000..ceef7e1ad0
--- /dev/null
+++ b/python/VERSION
@@ -0,0 +1 @@
diff --git a/python/setup.cfg b/python/setup.cfg
index 12b99a796e..260f7f4e94 100755
--- a/python/setup.cfg
+++ b/python/setup.cfg
@@ -1,5 +1,6 @@
 name = qemu
+version = file:VERSION
 maintainer = QEMU Developer Team
 maintainer_email = qemu-devel@nongnu.org
 url = https://www.qemu.org/

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