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Break action preference #8205
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Interesting idea but I would have expected this functionality to be part of |
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@rkeithhill That approach would be more complicated to implement. We already have a framework for message processing with ActionPreference variables and the common -ErrorAction and -WarningAction parameters. This is just additional message processing that extends that framework. It fits quite naturally into what is already there, and is intended to supercede ActionPreference.Inquire, which is antiquated and of questionable value (but can remain around as a museum artifact to remind us of how we could debug in PowerShell 1.0). Plus for the most common use case, entering the debugger on error, possibly for a specific command that is deep in a call stack, you can either use -ErrorAction Break at the top level or set -ErrorAction on the specific command where you want to break using $PSDefaultParameterValues. No new breakpoint types were required, and based on personal experience evangelizing the debugger to the community and gathering feedback from the community, I think this approach will get much more use than a new Set-PSBreakpoint parameter set would. It's much more visual and easier to digest for scripters. |
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All good points but consider that if |
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Tracing isn't really an advantage in the case of stream messages though, is it? Messages provide that naturally (they are messages sent through a stream, after all). Also, with so many scripters who don't use the debugger, the simple UX that this provides feels like a win to me. But you're right, you don't get conditional breakpointing with this approach. I was looking at this again this morning, and could add a new type of breakpoint so that either |
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@PaulHigin Even though this is only marked WIP for now (mostly because I want to make sure I have adequate test coverage once this is all hashed out), I'd really like your thoughts on what I've done here so far. |
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Overall I like this a lot. Please be sure to test with remote debugging, debugging runspaces (nested), job debugging, etc. We have tests for this, but they haven't been ported yet because they are c# tests requiring "friend" test assemblies. But we should add test hooks at some point. For the short term, manual testing is probably Ok.
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Regarding ActionPreference versus new breakpoint type, I think I prefer the current ActionPreference. This is different than breakpoints, more like Wait-Debugger, and I feel adding a new breakpoint type that really isn't a breakpoint could be confusing. OTOH it would be nice to also include a "break on exception (terminating error)", and I am not sure how that would be set ... breakpoint type or new built-in variable. It is worth thinking about and discussing. |
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At first look users can understand that If I remember right there is a problem with propagating the preference variables ($DebugPreference, $ErrorActionPreference, $InformationPreference, $ProgressPreference, $VerbosePreference, $WarningPreference) to local and module scopes. This may somehow affect this enhancement. |
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@iSazonov Regarding the suggestion for I also thought about the possible confusion between Can you share more details about the problem with propagating preference variables that you mentioned so that I'm aware of the details? |
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@KirkMunro My understanding of it is that pref variables ( For example:
Result: module A sees the value you set, but However, it is my understanding that it manages to work correctly when (in the above example) calling a command from module A with Please correct me if my understanding is lacking @iSazonov 😄 |
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@vexx32 Thanks! You are right. |
This change should have been made with the last commit
…o/PowerShell into break-action-preference
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@PowerShell/powershell-committee summary: @KirkMunro could you elaborate more on your reasoning for not adding this functionality to Given a concern about the proliferation of trivial type accelerators, instead of adding a new accelerator, we should just fix our tab completion to complete the same way that parameters like As for the |
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Great questions @joeyaiello. Answers below.
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One more thought regarding the "proliferation of trivial type accelerators": what if PowerShell automatically worked as if you had invoked the equivalent of the snippet below at the top of every script/script module? using namespace System.Management.Automation
using namespace System.Management.Automation.Language
using namespace System.Management.Automation.RunspacesI think that, plus type acceleration for aliases/shorthand type names and outliers that are in namespaces from which you only care about a few types, would make working with the .NET side of PowerShell much easier. Is there a downside to automatically using some core namespaces that are among the most frequently used in PowerShell? |
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I'm fine not making the ActionPreference.Break support an experimental feature.
It's doable if we really want, by making the -ErrorAction, -WarningAction and preference variables not accept the Break value when the feature is disabled, but I don't think that will really provides a useful experience.
Now we just need the committee's decision on the new accelerator.
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@daxian-dbw Not directly related to this PR being merged, I have a question about experimental features. Is the experimental part of a feature strictly defined by interface changes? For example, with this PR, it adds a new
Contrast that with a new cmdlet that experimental or a new parameter/parameter set on a cmdlet that is experimental, where it is much easier to isolate the experimental code such that it doesn't do anything at all when the experimental feature is disabled. This may be a better side-bar discussion, but it's something I find very confusing and it's the key point that makes me question the value of experimental features, when the bulk of the change is applied regardless... |
No, it's not. It's about the functionality/behavior before and after introducing a new feature.
For changes like this PR -- mostly updating engine code that are hard to co-exist with the old engine code, I personally think it shouldn't be targeted as an experimental feature. (if the engine code changes caused any change in existing behavior, it will be noticed too even with the feature enabled). |
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Thanks for that reply, @daxian-dbw, that was helpful.
Does @SteveL-MSFT's reply here satisfy that need? Or does this still require being put in front of the committee again? |
Steve's opinion is very important for driving the committee's conclusion, but we still need the committee's approval on this. We're having a meeting this afternoon, so it should be done today :) |
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@KirkMunro to help make the @PowerShell/powershell-committee meetings more efficient, we're trying to add individual opinions on items for review rather than having the discussion entirely within the meeting. So don't be surprised if you start seeing more of this. |
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@PowerShell/powershell-committee reviewed this and do not support adding the type accelerator as |
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Just to add a little more context: we don't want to open the doors for more low-use type accelerators in the future. And in my opinion, "[actionpreference]" is just as difficult to get right sans tab as "SilentlyContinue". I'm sure there's more out there that I'm not aware of, but I'm also not at all a fan of an all-lowercase, two-word accelerator like that. Accelerators like "[string]" and "[int]" fit a lot better with what folks are used to seeing from a non-PS type perspective. |
@joeyaiello I removed the accelerator, but I disagree with the committee decision on this and will point a few things out highlighting why I disagree:
I only made it all lowercase to follow the format of other accelerators. My preference would have been for an All of this aside, the accelerator is out and this PR is ready for merge. |
src/Microsoft.PowerShell.Commands.Utility/commands/utility/EnableDisableRunspaceDebugCommand.cs
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The updates about reverting actionpreference accelerator look good to me.
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@KirkMunro Please update the PR description. |
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@iSazonov Done. |
* Build(deps): Bump Microsoft.PowerShell.Archive from 1.2.2.0 to 1.2.3.0 in /src/Modules (PowerShell#9593) * Support line continuance with pipe at the start of a line (PowerShell#8938) Expands line continuance for pipelines to allow lines to continue automatically without backticks with the pipe symbol at the start of a line. 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Signed-off-by: dependabot-preview[bot] <support@dependabot.com> * add performance tag to change log command * Bump PowerShellGet from 2.1.5 to 2.2 in /src/Modules (PowerShell#10085) Bumps [PowerShellGet](https://github.com/PowerShell/PowerShellGet) from 2.1.5 to 2.2. - [Release notes](https://github.com/PowerShell/PowerShellGet/releases) - [Changelog](https://github.com/PowerShell/PowerShellGet/blob/development/CHANGELOG.md) - [Commits](https://github.com/PowerShell/PowerShellGet/commits) Signed-off-by: dependabot-preview[bot] <support@dependabot.com> * Move some of the creations of `WildcardPattern` in outer loop to avoid unnecessary allocation (PowerShell#10053) * Add another fast path to `WildcardPattern.IsMatch` for patterns that only have an asterisk in the end (PowerShell#10054) * Update change log generation tool to deal with private commits (PowerShell#10096) * Bump System.Text.Encoding.CodePages (PowerShell#10112) Bumps System.Text.Encoding.CodePages from 4.6.0-preview6.19303.8 to 4.6.0-preview.19113.10. Signed-off-by: dependabot-preview[bot] <support@dependabot.com> * Bump System.Security.AccessControl (PowerShell#10100) Bumps System.Security.AccessControl from 4.6.0-preview6.19303.8 to 4.6.0-preview.19113.10. Signed-off-by: dependabot-preview[bot] <support@dependabot.com> * Bump System.Threading.AccessControl (PowerShell#10106) Bumps System.Threading.AccessControl from 4.6.0-preview6.19303.8 to 4.6.0-preview.19113.10. Signed-off-by: dependabot-preview[bot] <support@dependabot.com> * Bump System.Data.SqlClient (PowerShell#10109) Bumps System.Data.SqlClient from 4.7.0-preview6.19303.8 to 4.7.0-preview.19113.10. Signed-off-by: dependabot-preview[bot] <support@dependabot.com> * Bump System.Management (PowerShell#10110) Bumps System.Management from 4.6.0-preview6.19303.8 to 4.6.0-preview.19113.10. Signed-off-by: dependabot-preview[bot] <support@dependabot.com> * Bump System.DirectoryServices (PowerShell#10105) Bumps System.DirectoryServices from 4.6.0-preview6.19303.8 to 4.6.0-preview.19113.10. Signed-off-by: dependabot-preview[bot] <support@dependabot.com> * Bump System.Security.Cryptography.Pkcs (PowerShell#10107) Bumps System.Security.Cryptography.Pkcs from 4.6.0-preview6.19303.8 to 4.6.0-preview.19113.10. Signed-off-by: dependabot-preview[bot] <support@dependabot.com> * Bump System.IO.Packaging (PowerShell#10108) Bumps System.IO.Packaging from 4.6.0-preview6.19303.8 to 4.6.0-preview.19113.10. Signed-off-by: dependabot-preview[bot] <support@dependabot.com> * Bump System.Security.Principal.Windows (PowerShell#10101) Bumps System.Security.Principal.Windows from 4.6.0-preview6.19303.8 to 4.6.0-preview.19113.10. Signed-off-by: dependabot-preview[bot] <support@dependabot.com> * Bump System.Security.AccessControl (PowerShell#10102) Bumps System.Security.AccessControl from 4.6.0-preview6.19303.8 to 4.6.0-preview.19113.10. Signed-off-by: dependabot-preview[bot] <support@dependabot.com> * Bump System.Configuration.ConfigurationManager (PowerShell#10111) Bumps System.Configuration.ConfigurationManager from 4.6.0-preview6.19303.8 to 4.6.0-preview.19113.10. Signed-off-by: dependabot-preview[bot] <support@dependabot.com> * Add -SecurityDescriptorSddl parameter to Set-Service (PowerShell#8626) * Bump System.Text.Encodings.Web (PowerShell#10123) Bumps System.Text.Encodings.Web from 4.6.0-preview6.19303.8 to 4.6.0-preview.19113.10. Signed-off-by: dependabot-preview[bot] <support@dependabot.com> * Revert "Bump System.IO.Packaging (PowerShell#10108)" (PowerShell#10125) This reverts commit 45edbd7. * Revert "Bump System.Data.SqlClient (PowerShell#10109)" (PowerShell#10126) This reverts commit 83d8ec4. * Revert "Bump System.Threading.AccessControl (PowerShell#10106)" (PowerShell#10127) This reverts commit a7f0c6d. * Revert "Bump System.Text.Encodings.Web (PowerShell#10123)" (PowerShell#10124) This reverts commit b9501d9. * Revert "Bump System.Management (PowerShell#10110)" (PowerShell#10129) This reverts commit e5990ed. * Revert "Bump System.Security.Cryptography.Pkcs (PowerShell#10107)" (PowerShell#10130) This reverts commit d33c906. * Revert "Bump System.Text.Encoding.CodePages (PowerShell#10112)" (PowerShell#10131) This reverts commit 958cdda. * Revert "Bump System.Security.AccessControl (PowerShell#10102)" (PowerShell#10132) This reverts commit 729a29a. * Revert "Bump System.Configuration.ConfigurationManager (PowerShell#10111)" (PowerShell#10128) This reverts commit c8fe894. * Revert "Bump System.Security.Principal.Windows (PowerShell#10101)" (PowerShell#10133) This reverts commit f75c635. * Cleanup workflow - remove PSProxyJob (PowerShell#10083) * Revert "Bump System.DirectoryServices (PowerShell#10105)" (PowerShell#10135) This reverts commit 2852efc. # Conflicts: # src/System.Management.Automation/System.Management.Automation.csproj * Fix test password generation rule to meet Windows complexity requirements (PowerShell#10143) * Cleanup CompiledScriptBlock.cs (PowerShell#9735) * Add alias for Service 'StartType' (PowerShell#9940) * Mark Set-Service tests with password as `Pending` (PowerShell#10146) * Split the fxdependent package on Windows into two packages (PowerShell#10134) * Remove 'kill' alias for Stop-Process cmdlet on Unix (PowerShell#10098) * Identify renaming a parameter set as non-breaking in the breaking change contract document (PowerShell#10113) * Identify renaming a parameter set as non-breaking Related discussion: PowerShell#10058. * Add note about S.M.A.Internal * Update DotNet Support links (PowerShell#10145) * Remove `markdownlint` tests due to security issues (PowerShell#10163) * Remove `markdownlint` tests due to security issues (PowerShell#10163) * Merged PR 5767: Fix RegEx DoS issues Fix RegEx DoS issues * Skip `JumpList` on `NanoServer` and `IoT` (PowerShell#10164) * Skip `JumpList` on `NanoServer` and `IoT` (PowerShell#10164) * Merged PR 9185: Update PowerShell SDK version for hosting tests Update PowerShell SDK version for hosting tests * Merged PR 9168: Disable Enter-PSHostProcess cmdlet when system in lock down mode This is based on an issue, where Enter-PSHostProcess on a locked down (WDAC enforced) machine allows any admin to connect to any another local hosted PowerShell process and execute commands as that user. This amounts to privilege escalation on the policy locked down machine and something we want to prevent. Fix is to check for system lock down and disable Enter-PSHostProcess cmdlet with an error message. * Update README.md and metadata.json for next releases (PowerShell#10087) * Add tooling section to PR template (PowerShell#10144) * Add .devcontainer configuration (PowerShell#10114) * Add the license header to `nanoserver.tests.ps1` (PowerShell#10171) * Refactor security policy documentation so that they appear in the Security policy tab of GitHub (PowerShell#9905) Co-Authored-By: Travis Plunk <travis.plunk@microsoft.com> * PSSA also includes formatting (PowerShell#10172) * Merged PR 9166: Update changelog for v7.0.0-preview.2 Update changelog for v7.0.0-preview.2 Updates are expected when STA / MTA change comes in. * Fix hungarian prefix 'my' (PowerShell#9976) * Update docs for `7.0.0-preview.2` release (PowerShell#10160) * Update release date for `v7.0.0-preview.2` (PowerShell#10176) * Reduce allocations in Escape() and Unescape() (PowerShell#10041) * Add -Raw switch to Select-String for convenience (PowerShell#9901) * Avoid boxing when passing value type arguments to `PSTraceSource.WriteLine` (PowerShell#10052) * Fix macOS build break (PowerShell#10207) * Use nameof() in LocationGlobber and PathInfo (PowerShell#10200) * Use nameof() in LocationGlobber * Use nameof() in PathInfo * Fix: Removed dependency file with Dependabot (PowerShell#10212) * Enable `-sta` and `-mta` switches for pwsh (PowerShell#10061) * Use 'Platform.IsWindowsDesktop' instead of checking both NanoServer and IoT (PowerShell#10205) * Special case the posix locale in WildcardPattern (PowerShell#10186) * Quote arguments in `.vscode/tasks.json` in case of spaces (PowerShell#10204) * Create`Distribution_Request` issue template (PowerShell#10253) * Fix spelling error in issue template (PowerShell#10256) * Revert the temporary change (PowerShell#10260) * Bump Microsoft.CodeAnalysis.CSharp from 3.1.0 to 3.2.0 (PowerShell#10273) Bumps [Microsoft.CodeAnalysis.CSharp](https://github.com/dotnet/roslyn) from 3.1.0 to 3.2.0. - [Release notes](https://github.com/dotnet/roslyn/releases) - [Changelog](https://github.com/dotnet/roslyn/blob/master/docs/Breaking%20API%20Changes.md) - [Commits](https://github.com/dotnet/roslyn/commits) Signed-off-by: dependabot-preview[bot] <support@dependabot.com> * Cleanup: ThreadAbortException is now in .Net Core 3.0 (PowerShell#10230) * Cleanup: ThreadAbortException is now in .Net Core 3.0 * Fix CodeFactor issue * Remove ThreadAbortException * Remove ThreadAbortException relared code * Remove stable and servicing branches from dependabot (PowerShell#10289) * Update dead links from powershell.com (PowerShell#10297) * Remove extra check that the system dll exists (PowerShell#10244) * Update PowerShell to build against .NET Core 3.0-preview7 (PowerShell#10227) * Fix debugger disable performance regression (PowerShell#10269) * Don't collect process starttime as it's not being used on consolehost startup (PowerShell#10294) * mark _readyForInputTimeInMS member as part of LEGACYTELEMETRY * move _interactiveCommandCount to LEGACYTELEMETRY * Cleanup Docker release testing (PowerShell#10310) * Update our language on our policy applying to security issues (PowerShell#10304) * Add tests for WildcardPattern.Escape() and Unescape() (PowerShell#10090) * Update 'Microsoft.PowerShell.CoreCLR.Eventing' to resolve conflict with 'System.Diagnostics.EventLog' (PowerShell#10305) * Update 'Microsoft.PowerShell.CoreCLR.Eventing' to resolve conflicts * Add reference to 'System.Diagnostics.EventLog' to build Microsoft.PowerShell.Commands.Diagnostics on Unix * Stop compiling Get/New-WinEvent on Unix * Enable Experimental Features by default on Preview builds (PowerShell#10228) * Bump Microsoft.CodeAnalysis.CSharp from 3.2.0 to 3.2.1 (PowerShell#10330) Bumps [Microsoft.CodeAnalysis.CSharp](https://github.com/dotnet/roslyn) from 3.2.0 to 3.2.1. - [Release notes](https://github.com/dotnet/roslyn/releases) - [Changelog](https://github.com/dotnet/roslyn/blob/master/docs/Breaking%20API%20Changes.md) - [Commits](https://github.com/dotnet/roslyn/commits) Signed-off-by: dependabot-preview[bot] <support@dependabot.com> * Expose PreRelease label in PSModuleInfo formatter (PowerShell#10316) * Reduce allocations in MakePath() method (PowerShell#10027) * Add `Microsoft.PowerShell.CoreCLR.Eventing.dll` to exception list for build fix (PowerShell#10337) * Add dispose of _runspaceDebugCompleteEvent event object. (PowerShell#10323) * Make module name matching for `get-module -FullyQualifiedName`… (PowerShell#10329) * Fix `#requires -version` for pwsh 7 to include 6.1 and 6.2 in `PSCompatibleVersions` (PowerShell#9943) * Implement ForEach-Object -Parallel feature (PowerShell#10229) * Add support for AppX reparse points (PowerShell#10331) * Make Get-DscResource work with class based resources (PowerShell#10350) * pwsh -Login support (PowerShell#10050) * Deprecate internal HelpCategory.Workflow enumeration (PowerShell#10319) * Fix style issues in InternalCommands.cs (PowerShell#10352) * Deprecate workflow debugging code (PowerShell#10321) * Bump NJsonSchema from 10.0.21 to 10.0.22 (PowerShell#10364) Bumps [NJsonSchema](https://github.com/RicoSuter/NJsonSchema) from 10.0.21 to 10.0.22. - [Release notes](https://github.com/RicoSuter/NJsonSchema/releases) - [Commits](https://github.com/RicoSuter/NJsonSchema/commits) Signed-off-by: dependabot-preview[bot] <support@dependabot.com> * Move to .NET Core 3.0 preview.8 (PowerShell#10351) * Update Microsoft.Management.Infrastructure version to 2.0.0-preview.2 (PowerShell#10366) * Mark `-parallel` and `-throttlelimit` reserved for `foreach` and `switch` statements (PowerShell#10328) * Fix minor breakpoint re-hydration bug (PowerShell#10339) * Additional Telemetry - Implementation of `RFC0036` (PowerShell#10336) * Formatting: Handle `XTPUSHSGR` and `XTPOPSGR` control sequences (PowerShell#10208) * .CPL should be added to PATHEXT (PowerShell#9828) * Add experimental check for `ForEach-Object -Parallel` tests (PowerShell#10354) * Bump `PackageManagement` from `1.4.3` to `1.4.4` (PowerShell#10383) Bumps PackageManagement from 1.4.3 to 1.4.4. Signed-off-by: dependabot-preview[bot] <support@dependabot.com> * Bump PowerShellGet from 2.2 to 2.2.1 in /src/Modules (PowerShell#10382) Bumps [PowerShellGet](https://github.com/PowerShell/PowerShellGet) from 2.2 to 2.2.1. - [Release notes](https://github.com/PowerShell/PowerShellGet/releases) - [Changelog](https://github.com/PowerShell/PowerShellGet/blob/development/CHANGELOG.md) - [Commits](https://github.com/PowerShell/PowerShellGet/commits) Signed-off-by: dependabot-preview[bot] <support@dependabot.com> * Merged PR 9744: Update changelog for preview.3 release Update changelog for preview.3 release * Update `README.md` and `metadata.json` for `7.0.0-preview.3` (PowerShell#10393) * Add `PSKoans` to Learning Resources documentation (PowerShell#10369) * Add some regular contributors to allow access to retry CI (PowerShell#10397) * Some dependencies for Alpine need `linux-x64` folder (PowerShell#10407) * Block type update in Add-Type cmdlet (PowerShell#9609) * Increase built-with-PowerShell module versions to 7.0.0.0 (PowerShell#10356) * Rename default ParameterSetName back to `Delimiter` for `ConvertTo-Csv` & `ConvertFrom-Csv` (PowerShell#10425) * rename default parameterset name back to `Delimiter` * also fix convertfrom-csv * rename parametersetname for UseCulture back to UseCulture since there is no path for ConvertFrom-Csv * Skip auto-loading PSReadLine on Windows if the NVDA screen reader is active (PowerShell#10385) * Bump NJsonSchema from 10.0.22 to 10.0.23 (PowerShell#10421) Bumps [NJsonSchema](https://github.com/RicoSuter/NJsonSchema) from 10.0.22 to 10.0.23. - [Release notes](https://github.com/RicoSuter/NJsonSchema/releases) - [Commits](https://github.com/RicoSuter/NJsonSchema/commits) Signed-off-by: dependabot-preview[bot] <support@dependabot.com> * Add support to `ActionPreference.Break` to break into debugger (PowerShell#8205) * Alpine validation changes (PowerShell#10428) * Remove yet another appveyor reference (PowerShell#10445) * Update the combined package build to release the daily builds (PowerShell#10449) * Cleanup `AutomationEngine` and remove extra `SetSessionStateDrive` method call (PowerShell#10416) * Make sure the daily coordinated build, knows it is a daily bui… (PowerShell#10464) * Minor fix for recursion into OneDrive - Change FindFirstFileEx() to use SafeFindHandle type (PowerShell#10405) * Update README.md (PowerShell#10465) Fix typo. * Make `ForEach-Object` faster for its commonly used scenarios (PowerShell#10454) * Fix global tool issues around exit code, command line parameters and path with spaces (PowerShell#10461)
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PR Summary
Added
ActionPreference.Break. This new ActionPreference value allows for scripters to break into the debugger anytime a message is to be sent to a stream. It can be used for specific commands via the-ErrorActionor-WarningActioncommon parameters, or across scripts using one of the preference variables ($DebugPreference,$ErrorActionPreference,$InformationPreference,$ProgressPreference,$VerbosePreference, or$WarningPreference).When a record for one of these message types is raised, if the corresponding preference variable is set to
ActionPreference.Break, PowerShell will immediately enter the debugger and add the appropriate message record to the $PSDebugContext variable in the new Trigger property.These changes also include the following:
PR Checklist
.h,.cpp,.cs,.ps1and.psm1files have the correct copyright headerWIP:to the beginning of the title and remove the prefix when the PR is ready.[feature]if the change is significant or affects feature tests