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Fix nil-sink panic in host.New when binding referenced plugins - #23647
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Schema binding instantiates a throwaway host with nil diagnostic sinks (see newBinder in pkg/codegen/schema/bind.go) when it needs to load a referenced package. If that reference points at an uninstalled plugin, the plugin download-progress callback logs through the host, which dereferenced a nil diag sink and panicked. This regressed in #23573, which moved the default host to pkg/host. The previous code routed through plugin.NewContext, which defaults nil sinks to a discarding sink before constructing the host; pkghost.New did not. Default nil sinks to a discarding sink in host.New, matching the documented contract of plugin.NewContextWithHost ("d, statusD ... may all be nil"). This also covers the other nil-sink call site in pkg/cmd/pulumi/plugin/plugin_run.go. Fixes #23646
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This PR has been shipped in release v3.248.0. |
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Fixes #23646
Problem
pulumi package get-schema(andpulumi package add,pulumi plugin run) panics with a nil pointer dereference when binding a schema that$refs a package whose plugin is not yet installed locally. Binding the reference triggers a plugin download, and the download-progress callback logs through a host whose diagnostic sink isnil:This is a regression in v3.247.0: v3.246.0 downloads the referenced plugin cleanly.
Root cause
Schema binding instantiates a throwaway host with
nildiagnostic sinks when it needs to load a referenced package (newBinderinpkg/codegen/schema/bind.go). The regression is #23573, which moved the default host intopkg/host. The previous code routed host construction throughplugin.NewContext, which defaultsnilsinks to a discarding sink before building the host.pkghost.Newdid not, leavinghost.diagnil — sohost.Logpanicked once the download callback fired.Fix
Default
nilsinks to a discarding sink inhost.New, matching the documented contract ofplugin.NewContextWithHost("d, statusD ... may all be nil"). This also covers the other nil-sink call site inpkg/cmd/pulumi/plugin/plugin_run.go.Test
TestLogWithNilSinkinpkg/host/host_test.goconstructs a host with nil sinks and asserts thatLog/LogStatusdo not panic. It reproduces the exact panic (host.go:170) without the fix and passes with it.