unshare: support for systemd-nsresourced, --map-foreign option - #4560
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Skyb0rg007 wants to merge 1 commit into
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unshare: support for systemd-nsresourced, --map-foreign option#4560Skyb0rg007 wants to merge 1 commit into
--map-foreign option#4560Skyb0rg007 wants to merge 1 commit into
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Adds the `--map-foreign` option, which uses systemd-nsresourced to setup the uid and gid maps, additionally asking the service to map the foreign UID range. The `--map-current-user` and `--map-root-user` options are also compatible.
Skyb0rg007
marked this pull request as draft
August 13, 2026 23:14
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Adds the
--map-foreignoption, which usessystemd-nsresourced.service(8)to setup the uid and gid maps, specifically for asking the service to map the foreign UID range. The--map-current-userand--map-root-useroptions are also compatible:--map-current-useris the default, and--map-root-usertranslates into"target": 0.systemd-nsresourcedhas other options, but the primary use case that I envisionunshareto be used for is to manage files owned by theforeign-0-foreign-65534UIDs and GIDs.Specifically, running
unshare --map-foreign --map-root-user -- rm -rf ./dirto delete local files that were created usingsystemd-nspawn(1)orsystemd-mountfsd.service(8)'sio.systemd.MountFileSystem.MakeDirectoryVarlink method.The important thing to note is that the foreign UID range is a systemd concept, so
newuidmapis not usually able to map those uids into the user namespace.This is a draft PR to garner feedback, as this is a new idea.