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The prune option uninstalled all managed Python versions (and tools) and reinstalled them on every activation, which is slow. Instead, resolve each requested version to the install target uv would produce and uninstall only the difference; already-correct versions are left untouched. Resolving to the install target (not every installed match) also prunes superseded patch releases, which uv retains on upgrade. Tools are diffed by PEP 503-normalized package name: requested names are extracted and normalized at build time, and the installed set is read from uv's tool directory, whose entries are already normalized, so no uv output is parsed. Pruning to an empty set still removes everything.
50 lines
1.9 KiB
Nix
50 lines
1.9 KiB
Nix
{
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programs.uv = {
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enable = true;
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python = {
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versions = [
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"3.12"
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"3.13"
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];
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default = "3.13";
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prune = true;
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};
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};
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test.stubs.uv.name = "uv";
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nmt.script = ''
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# With prune the set is fully declarative, but only the diff is touched:
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# each requested version is resolved to the key uv would install (matching is
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# delegated to uv, `--managed-python` keeps system Pythons out of reach). We
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# keep the install target (`.[0]`, newest match), not every installed match,
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# so superseded patch releases uv retains on upgrade are still pruned.
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assertFileContains activate \
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'for uvReq in 3.12 3.13; do'
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assertFileContains activate \
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'@uv@/bin/uv python list "$uvReq" --managed-python --output-format json'
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assertFileContains activate \
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"done | jq -s 'map(.[0].key // empty)'"
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# …then managed installs outside that target set are uninstalled, one by one,
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# via a set difference (jq's `-` operator) against the kept keys.
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assertFileContains activate \
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'@uv@/bin/uv python list --only-installed --managed-python --output-format json'
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assertFileContains activate \
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"jq -r --argjson keep \"\$uvKeep\" '([.[].key] | unique) - \$keep | .[]'"
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assertFileContains activate \
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'run @uv@/bin/uv python uninstall $VERBOSE_ARG "$uvKey"'
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# The old brute-force `uninstall --all` reinstall churn is gone; kept
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# versions are only installed/upgraded, never uninstalled and reinstalled.
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assertFileNotRegex activate 'python uninstall \$VERBOSE_ARG --all'
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# A bare string for `default` is coerced to a single-element list, installed
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# with `--default`. Both requests are major/minor, so they install with
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# `--upgrade`.
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assertFileContains activate \
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'run @uv@/bin/uv python install $VERBOSE_ARG --default --upgrade 3.13'
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assertFileContains activate \
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'run @uv@/bin/uv python install $VERBOSE_ARG --upgrade 3.12'
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'';
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}
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