[rush] Can update-autoinstallers write common/autoinstallers/rush-plugins/.rush/temp/last-install.flag?

[LPegasus]

Summary

After executing rush update-autoinstaller, the .rush/temp/last-install.flag file was not written, causing subsequent related commands to perform the installation again.

Repro steps

• Change any dependencies version in autoinstallers/*/package.json
• Run rush update-autoinstaller --name xxx.
• Run rush install-autoinstaller --name xxx. Expect to skip installation.

Standard questions

Please answer these questions to help us investigate your issue more quickly:

Question	Answer
@microsoft/rush globally installed version?	5.155.1
rushVersion from rush.json?	5.155.1
useWorkspaces from rush.json?	Yes
Operating system?	Mac
Would you consider contributing a PR?	Yes
Node.js version (node -v)?	22.20.0

[LPegasus]

Do I understand correctly that we just need to refer to the code logic in https://github.com/microsoft/rushstack/blob/1627a8386debc01fe198a2efcac0b8fa09fa5384/libraries/rush-lib/src/logic/Autoinstaller.ts#L106-L170 and implement the same generation logic for the last-install.flag file in https://github.com/microsoft/rushstack/blob/1627a8386debc01fe198a2efcac0b8fa09fa5384/libraries/rush-lib/src/logic/Autoinstaller.ts#L173?

[iclanton]

Looks like a simple oversight. @LPegasus, that seems like the right place.