Translate guest paths through the sysroot sidecar#242
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Documentation rewriting in progress. |
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Consolidate the sysroot path-translation handlers so guest-visible paths are reconstructed and reverse-mapped consistently across syscalls.
Cover the sysroot translation model end to end: - Add the sysroot path-translation matrix test and the exec-cwd regression test. - Run the path matrix on a case-sensitive volume and validate it against a real kernel. - Cover guest-private prefix classification, execveat /dev/shm nofollow, the absock namespace lifecycle, and PT_INTERP tokenized-parent fallback. - Add the sidecar-state check helper.
Describe how guest paths are translated through the sysroot and sidecar, including AF_UNIX socket addresses, and link it from the internals and usage docs.
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Consolidate the sysroot path-translation handlers so guest-visible paths are reconstructed and reverse-mapped consistently across syscalls.
Closes #233
Summary by cubic
Unifies sysroot path translation through the sidecar so all syscalls resolve and reverse-map guest paths consistently across fork/exec, networking, and inotify. Adds AF_UNIX pathname translation with safe over‑length handling, tighter loader fallback,
/dev/shmno‑follow/non‑block opens,AT_EMPTY_PATHsupport, and a full test suite and docs.path.cused by exec, fs/stat, inotify, and networking, with sysroot dispatch, containment, sidecar handling, a token‑awareAT_FDCWDfast path, anAT_EMPTY_PATHhelper, and/dev/shmopen flags (O_NOFOLLOW|O_NONBLOCK); inotify snapshots emit guest‑visible names and hide sidecar artifacts.PT_INTERPandexecveatshare translation; loader falls back to/lib/<basename>only if the rewritten interpreter both differs and exists;execveattranslates dirfd‑relative names and opens/dev/shmleaves withO_NOFOLLOW;getcwd,/proc/self/cwd, and/proc/self/exeare reverse‑mapped after fork/exec.sun_pathis shortened via a symlink in a private absock dir shared across the forked tree; socket addresses round‑trip guest↔host across bind/connect/sendmsg/accept/recvmsg; the namespace cleans up without leaks on exit.docs/sysroot.md; added the path‑translation matrix (casefold and case‑sensitive lanes) validated against a real kernel, the exec‑cwd regression test,/dev/shmexecveatno‑follow test, absock cleanup test, and a sidecar state checker wired intomake check.Written for commit 6a7cc5a. Summary will update on new commits.