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343279110a
Previously our graph walker expected to recieve a data structure containing schemas for all of the provider and provisioner plugins used in the configuration and state. That made sense back when terraform.NewContext was responsible for loading all of the schemas before taking any other action, but it no longer has that responsiblity. Instead, we'll now make sure that the "contextPlugins" object reaches all of the locations where we need schema -- many of which already had access to that object anyway -- and then load the needed schemas just in time. The contextPlugins object memoizes schema lookups, so we can safely call it many times with the same provider address or provisioner type name and know that it'll still only load each distinct plugin once per Context object. As of this commit, the Context.Schemas method is now a public interface only and not used by logic in the "terraform" package at all. However, that does leave us in a rather tenuous situation of relying on the fact that all practical users of terraform.Context end up calling "Schemas" at some point in order to verify that we have all of the expected versions of plugins. That's a non-obvious implicit dependency, and so in subsequent commits we'll gradually move all responsibility for verifying plugin versions into the caller of terraform.NewContext, which'll heal a long-standing architectural wart whereby the caller is responsible for installing and locating the plugin executables but not for verifying that what's installed is conforming to the current configuration and dependency lock file.
86 lines
2.5 KiB
Go
86 lines
2.5 KiB
Go
package terraform
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import (
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"log"
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"github.com/hashicorp/terraform/internal/addrs"
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"github.com/hashicorp/terraform/internal/configs"
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"github.com/hashicorp/terraform/internal/states"
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"github.com/hashicorp/terraform/internal/tfdiags"
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)
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// ImportOpts are used as the configuration for Import.
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type ImportOpts struct {
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// Targets are the targets to import
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Targets []*ImportTarget
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// SetVariables are the variables set outside of the configuration,
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// such as on the command line, in variables files, etc.
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SetVariables InputValues
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}
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// ImportTarget is a single resource to import.
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type ImportTarget struct {
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// Addr is the address for the resource instance that the new object should
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// be imported into.
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Addr addrs.AbsResourceInstance
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// ID is the ID of the resource to import. This is resource-specific.
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ID string
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// ProviderAddr is the address of the provider that should handle the import.
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ProviderAddr addrs.AbsProviderConfig
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}
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// Import takes already-created external resources and brings them
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// under Terraform management. Import requires the exact type, name, and ID
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// of the resources to import.
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//
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// This operation is idempotent. If the requested resource is already
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// imported, no changes are made to the state.
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//
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// Further, this operation also gracefully handles partial state. If during
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// an import there is a failure, all previously imported resources remain
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// imported.
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func (c *Context) Import(config *configs.Config, prevRunState *states.State, opts *ImportOpts) (*states.State, tfdiags.Diagnostics) {
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var diags tfdiags.Diagnostics
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// Hold a lock since we can modify our own state here
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defer c.acquireRun("import")()
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// Don't modify our caller's state
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state := prevRunState.DeepCopy()
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log.Printf("[DEBUG] Building and walking import graph")
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// Initialize our graph builder
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builder := &ImportGraphBuilder{
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ImportTargets: opts.Targets,
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Config: config,
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Plugins: c.plugins,
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}
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// Build the graph
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graph, graphDiags := builder.Build(addrs.RootModuleInstance)
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diags = diags.Append(graphDiags)
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if graphDiags.HasErrors() {
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return state, diags
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}
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variables := mergeDefaultInputVariableValues(opts.SetVariables, config.Module.Variables)
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// Walk it
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walker, walkDiags := c.walk(graph, walkImport, &graphWalkOpts{
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Config: config,
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InputState: state,
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RootVariableValues: variables,
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})
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diags = diags.Append(walkDiags)
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if walkDiags.HasErrors() {
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return state, diags
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}
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newState := walker.State.Close()
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return newState, diags
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}
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