Get version number w/o pkg_resources

This removes most of the usages of pkg_resources from the codebase, helping
the goal of getting rid of that completely.

With this change, version number is generated during install and embedded into
`__version__` which is then imported by root level `__init__`. From there,
it is used by other parts of the codebase when needed.

Generated `__version__` file is ignored and not tracked by git to prevent
unnecessary 'changes' messages and accidental commits of that file.

1 files changed, 2 insertions, 3 deletions

diff --git a/buildstream/_frontend/widget.py b/buildstream/_frontend/widget.py
index 1dccd0059..d61f338df 100644
--- a/buildstream/_frontend/widget.py
+++ b/buildstream/_frontend/widget.py
@@ -24,12 +24,12 @@ from contextlib import ExitStack
 from mmap import mmap
 
 import click
-import pkg_resources
 from ruamel import yaml
 
 from . import Profile
 from .. import Element, Scope, Consistency
 from .. import _yaml
+from .. import __version__ as bst_version
 from .._exceptions import ImplError
 from .._message import MessageType
 from ..plugin import _plugin_lookup
@@ -432,12 +432,11 @@ class LogLine(Widget):
         context = pipeline.context
         project = pipeline.project
         starttime = datetime.datetime.now()
-        bst = pkg_resources.require("buildstream")[0]
         text = ''
 
         # Main invocation context
         text += '\n'
-        text += self.content_profile.fmt("BuildStream Version {}\n".format(bst.version), bold=True)
+        text += self.content_profile.fmt("BuildStream Version {}\n".format(bst_version), bold=True)
         values = OrderedDict()
         values["Session Start"] = starttime.strftime('%A, %d-%m-%Y at %H:%M:%S')
         values["Project"] = "{} ({})".format(project.name, project.directory)