## Summary
- Bundles the glibc dynamic linker that `sharun` needs inside the Linux AppImage when the post-build AppImage cleanup runs.
- Repackages and re-signs AppImage artifacts when the only mutation is adding the missing loader, not just when graphics libraries were stripped.
- Keeps the existing Mesa/libdrm/libva stripping behavior intact and adds a release smoke item for the Ubuntu 24.04 `Interpreter not found!` regression.
## Problem
- `OpenHuman_0.54.0_amd64.AppImage` can exit immediately on Ubuntu 24.04 with `Interpreter not found!` because the AppImage contains a `sharun` launcher but no `lib/ld-linux-x86-64.so.2`.
- The existing post-processing script only repacked when graphics libraries were removed, so it had no guard for a missing `sharun` interpreter.
## Solution
- Detect `sharun`-style launchers by checking the extracted AppDir launcher binaries for the `Interpreter not found!` marker.
- Resolve the expected loader from the build target architecture and copy it into `squashfs-root/lib/` when missing.
- Fail the post-processing step if the AppImage uses `sharun` but the build host cannot provide the required loader.
- Track all modified AppImages, whether modified by stripping graphics libs or by adding the loader, so updater tarballs and signatures stay in sync.
## Submission Checklist
- [x] Tests added or updated (happy path + at least one failure / edge case) per [Testing Strategy](../gitbooks/developing/testing-strategy.md#failure-path-requirement) — release smoke checklist updated; local function smoke covers loader injection path.
- [x] **Diff coverage >= 80%** — N/A: shell release packaging script and docs are not covered by Vitest/cargo diff coverage.
- [x] Coverage matrix updated — N/A: release packaging behavior, not a product feature row.
- [x] All affected feature IDs from the matrix are listed in the PR description under `## Related` — N/A: no feature matrix row.
- [x] No new external network dependencies introduced (mock backend used per [Testing Strategy](../gitbooks/developing/testing-strategy.md#mock-policy))
- [x] Manual smoke checklist updated if this touches release-cut surfaces ([`docs/RELEASE-MANUAL-SMOKE.md`](../docs/RELEASE-MANUAL-SMOKE.md))
- [x] Linked issue closed via `Closes #NNN` in the `## Related` section
## Impact
- Linux AppImage release artifacts should launch on clean Ubuntu 24.04 hosts without requiring users to extract the AppImage and manually copy `ld-linux-x86-64.so.2`.
- Packaging fails earlier if a future build cannot locate the required loader, preventing a known-broken AppImage from shipping.
## Related
- Closes#2297
- Follow-up PR(s)/TODOs: N/A
---
## AI Authored PR Metadata (required for Codex/Linear PRs)
### Linear Issue
- Key: N/A
- URL: N/A
### Commit & Branch
- Branch: `codex/2297-appimage-sharun-loader`
- Commit SHA: `4260df24f5355a63df02e748e276586ebed0c53a`
### Validation Run
- [x] `pnpm --filter openhuman-app format:check` — N/A: no frontend files changed.
- [x] `pnpm typecheck` — N/A: no TypeScript files changed.
- [x] Focused tests: Git Bash smoke test for `ensure_sharun_interpreter` copies `ld-linux-x86-64.so.2` into a synthetic sharun AppDir.
- [x] Rust fmt/check (if changed): N/A: no Rust files changed.
- [x] Tauri fmt/check (if changed): N/A: no Tauri Rust files changed.
- [x] Shell syntax/check: `C:\Program Files\Git\bin\bash.exe -n scripts/release/strip-appimage-graphics-libs.sh`; `git diff --check`.
### Validation Blocked
- `command:` Full AppImage rebuild and launch on Ubuntu 24.04.
- `error:` No produced Linux AppImage artifact is available in this local Windows workspace.
- `impact:` CI release packaging will exercise the changed script; manual release smoke checklist now covers the Ubuntu 24.04 launch regression.
### Behavior Changes
- Intended behavior change: AppImage post-processing now bundles the missing `sharun` dynamic linker when needed.
- User-visible effect: Linux users should no longer hit `Interpreter not found!` on affected AppImages.
### Parity Contract
- Legacy behavior preserved: existing graphics-library stripping, re-signing, and updater tarball rebuild behavior remain intact.
- Guard/fallback/dispatch parity checks: AppImages unchanged by stripping or loader injection are still left untouched; missing host loader now fails packaging instead of shipping a broken artifact.
### Duplicate / Superseded PR Handling
- Duplicate PR(s): N/A
- Canonical PR: this PR
- Resolution (closed/superseded/updated): N/A
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
* **Bug Fixes**
* AppImages now remove incompatible host graphics libraries and auto-include a missing bundled dynamic loader when needed, preventing "Interpreter not found" failures on clean Ubuntu 24.04 hosts.
* **Chores**
* Added a smoke-test checklist item to validate AppImage launches on Ubuntu 24.04.
* Release tooling now only repacks and re-signs AppImages that were actually modified.
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<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Co-authored-by: aqilaziz <gonzes7@gmail.com>
Co-authored-by: Steven Enamakel <enamakel@tinyhumans.ai>
