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# Let built package know its version.
# Usually, when a package uses setuptools-scm as a build-time dependency, it
# expects to get the package version from SCM data. However, while doing a nix
# build, the source tree doesn't contain SCM data, so we should almost always
# get the version from the derivation attribute.
version-pretend-hook() {
if [ -z "$dontPretendSetuptoolsSCMVersion" -a -z "$SETUPTOOLS_SCM_PRETEND_VERSION" ]; then
echo Setting SETUPTOOLS_SCM_PRETEND_VERSION to $version
export SETUPTOOLS_SCM_PRETEND_VERSION="$version"
fi
}
# Include all tracked files.
# When a package uses setuptools-scm as a build-time dependency, it usually
# expects it to include all scm-tracked files in the built package, by default.
# This is the official setuptools-scm behavior, documented in
# https://setuptools-scm.readthedocs.io/en/latest/usage/#file-finders-hook-makes-most-of-manifestin-unnecessary
# and https://setuptools.pypa.io/en/latest/userguide/datafiles.html.
# However, while doing a nix build, the source tree doesn't contain SCM data,
# so it would include only `.py` files by default.
# We generate a MANIFEST.in automatically that includes all tracked files to
# emulate this behavior of setuptools-scm.
include-tracked-files-hook() {
if [ -z "$dontIncludeSetuptoolsSCMTrackedFiles" ]; then
echo Including all tracked files automatically
old_manifest="$(if [ -f MANIFEST.in ]; then cat MANIFEST.in; fi)"
echo 'global-include **' > MANIFEST.in
echo "$old_manifest" >> MANIFEST.in
fi
}
preBuildHooks+=(version-pretend-hook include-tracked-files-hook)
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