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Set TMPDIR to $XDG_RUNTIME_DIR/app/com.visualstudio.code - #3
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/tmp is always a private, sandbox-local tmpfs in Flatpak regardless of --filesystem=host, so Node's os.tmpdir() (used by the devcontainers CLI) writes build contexts there where the host-side podman (run via host-spawn) can't see them. $XDG_RUNTIME_DIR/app/<app-id> is the directory Flatpak actually shares with the host for this purpose, per the Flatpak sandbox-permissions docs. Cherry-picked from flathub#606, fixes flathub#605. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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Summary
TMPDIRto$XDG_RUNTIME_DIR/app/${FLATPAK_ID:-com.visualstudio.code}when launching VS Code, so Node'sos.tmpdir()(used by the devcontainers CLI) writes to a directory Flatpak actually shares with the host, instead of the sandbox-private/tmp.TMPDIR, then handed topodman-remoterunning on the host viahost-spawn— which can't see the sandbox's private/tmpeven with--filesystem=host(that permission doesn't cover/tmp; Flatpak always gives every app its own isolated tmpfs there).Cherry-picked from flathub/com.visualstudio.code#606, which fixes flathub#605.
Test plan
org.freedesktop.Sdk.Extension.podman) and confirm the feature build context is found instead of failing withno such file or directory