fix: keep conda and virtualenv activation across session restore by JJLiebig · Pull Request #4022 · herdrdev/herdr

JJLiebig · 2026-09-13T00:22:15Z

Takes over #2367 by @happysnehal111-del, rebased onto current master with review fixes.

Restore spawned panes with an empty PaneLaunchEnv and the snapshot had nowhere to record an activation, so a pane working in conda/venv came back on the shell default. At save, herdr now reads the foreground process's launch environment (/proc/<pid>/environ, KERN_PROCARGS2, or the Windows PEB) and stores only the prefix and display name; PATH is rebuilt from the prefix on restore. The optional virtual_env field keeps SNAPSHOT_VERSION at 3. CONDA_AUTO_ACTIVATE/_BASE are disabled for restored panes so conda's rc hook cannot shadow the restored environment.

Changes on top of #2367:

Remember the last activation seen on a foreground command so an idle-prompt save keeps it; a successful read with no activation clears it, a failed read keeps it, and an observed absence drops the restored value.
Clear the other activation family (CONDA_* vs VIRTUAL_ENV*) before applying a restored environment.
Run the layout tests on Windows, drop the docs/next/CHANGELOG.md edit, and reuse merged fix(linux): avoid blocking proc reads for WSL agents #2179's WSL/proc helpers instead of duplicating them.

Known limitations: on WSL the #2179 policy skips an identified agent's environment read, so that activation is not captured there; non-UTF-8 prefixes are treated as absent because the JSON snapshot cannot represent them; 1-vs-15 capture scaling was not measured.

Validated with cargo fmt --check, cargo clippy -D warnings, targeted nextest, and full just check on Windows; Linux/macOS covered by CI.

kangal-bot · 2026-09-13T00:22:23Z

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coderabbitai · 2026-09-13T00:22:25Z

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src/platform/mod.rs

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📝 Walkthrough

Walkthrough

The change adds cross-platform virtual-environment detection and parsing. Pane launches apply activation variables and PATH entries. Runtime state retains activations for idle shells and exposes them through terminal and tab APIs. Workspace snapshots capture activations and restore valid environments. Agent resume shells inherit restored activation state.

Suggested reviewers: ogulcancelik

Priority: ➖ Normal

Merge Risk: ⚪ Minimal · up to 5fd68

Virtual-environment restoration preserves activation state while clearing conflicting inherited activation variables, so no current merge-blocking risk is identified.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 68.18% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 88 functions across 12 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly and concisely describes the primary change: preserving Conda and virtualenv activation across session restore.
Description check	✅ Passed	The description directly explains the session-restore changes, platform support, activation handling, known limitations, and validation performed.

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coderabbitai · 2026-09-13T00:22:51Z

@kangal-bot: I will review the changes in #4022.

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greptile-apps · 2026-09-13T00:25:27Z

Confidence Score: 5/5

The PR appears safe to merge with no outstanding blocking findings.

Summary

Captures activation state from readable foreground processes on Linux, macOS, and Windows.
Distinguishes unreadable process state from an observed absence so transient failures do not erase remembered activation.
Restores activation variables and rebuilds PATH from the effective launch environment while clearing stale variables from the other activation family.
Reverts raw-byte preservation for non-UTF-8 Unix prefixes so JSON serialization cannot fail for the entire session.
Adds cross-platform parsing, path-layout, restore, compatibility, and state-resolution coverage.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart LR
    A[Foreground pane command] --> B[Platform environment reader]
    B --> C{Observation}
    C -->|Activation| D[Remember activation]
    C -->|NoActivation| E[Clear remembered activation]
    C -->|Unknown| F[Keep remembered or restored value]
    D --> G[Pane snapshot]
    E --> G
    F --> G
    G --> H[Session restore]
    H --> I[Validate prefix directory]
    I --> J[Clear inherited activation variables]
    J --> K[Rebuild activation PATH]
    K --> L[Restored shell and agent resume]

_{Reviews (3) · Last reviewed commit: "fix: keep the last pane environment acro..."}

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Actionable comments posted: 1

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Inline comments:
In `@src/persist/snapshot.rs`:
- Around line 372-385: Update capture_tab’s virtual_env selection to distinguish
an observed foreground command with no activation from unavailable activation
detection. Preserve the cleared no-activation state returned by
PaneRuntime::foreground_virtual_env, and apply the TerminalState::virtual_env
fallback only when detection is unavailable so deactivated environments are not
saved and reactivated.

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src/app/agent_resume.rs
src/pane.rs
src/persist/restore.rs
src/persist/snapshot.rs
src/platform/fallback.rs
src/platform/linux.rs
src/platform/macos.rs
src/platform/mod.rs
src/platform/windows.rs
src/terminal/runtime.rs
src/terminal/state.rs
src/workspace/tab.rs

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JJLiebig · 2026-09-13T00:40:34Z

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The two read-failure/deactivation findings and the idle-prompt finding are addressed in cb91320 (three-state environment observation). Please re-review the current head.

coderabbitai · 2026-09-13T00:40:46Z

@Pimpmuckl: I will review the current head, including cb91320f.

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A pane working inside an activated conda environment or virtualenv came back from restore on the shell's default environment, so an agent resumed into that pane ran against the wrong interpreter. Panes now record the activation prefix alongside their cwd, and restore hands it back to the shell it spawns, including the deferred spawn that resumes an agent. PATH is rebuilt from the prefix instead of replayed from the snapshot so a restored pane follows the current machine, and an environment that has been removed since the save is dropped rather than re-entered. The restored shell re-runs the user's rc files, so conda's automatic base activation is suppressed for it; otherwise base lands on PATH ahead of whatever was restored. The activation is carried on PaneLaunchEnv rather than expanded into launch variables at the call site, so its PATH is built from the PATH the pane actually launches with instead of the server's own. Reading a foreground process environment on Linux now goes through the same state and WSL guards as the other remote-memory-backed proc reads.

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Inline comments:
In `@src/pane.rs`:
- Around line 176-177: Update the activation environment application around
activation.launch_env and cmd.env to first remove inherited variables from both
virtualenv and Conda activation families, then apply the selected restored
environment. Add a regression test that provides conflicting inherited
activation variables and verifies stale variables do not remain after
restoration.

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src/pane.rs
src/persist/snapshot.rs
src/platform/fallback.rs
src/platform/linux.rs
src/platform/macos.rs
src/platform/mod.rs
src/platform/windows.rs
src/terminal/runtime.rs
src/workspace/tab.rs

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JJLiebig · 2026-09-13T00:58:05Z

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Both findings from the previous review are addressed in 50a0d89, and this head also rebases onto the just-merged #2179 so the Linux WSL/proc safety helpers are now shared rather than duplicated. Please re-review.

coderabbitai · 2026-09-13T00:58:24Z

@Pimpmuckl: I will re-review the current head, including 50a0d898 and the shared Linux WSL and /proc safety helper changes.

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Remember the last activation observed on a foreground command so a save taken at an idle shell prompt keeps the environment. Distinguish a successful read with no activation from an unreadable process so a transient failure cannot forget a valid environment, and let a successfully observed absence drop the value the pane was restored into. Clear an inherited activation from the other family before applying a restored environment. Move the virtualenv layout tests out of the Unix-only test module so the Windows directory list is exercised on Windows. refs #2367 Co-authored-by: happysnehal <happysnehal111@gmail.com>

JJLiebig · 2026-09-13T01:05:41Z

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5fd6851 reverts the non-UTF-8 byte-preserving parse (it made the JSON snapshot unserializable) and keeps the inherited-activation clearing. Please re-review the current head.

coderabbitai · 2026-09-13T01:06:53Z

@Pimpmuckl: I will re-review the current head, including 5fd68515.

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JJLiebig · 2026-09-13T01:16:25Z

Got this merge ready but keeping intentionally unmerged.

While it's heavily reviewed, it does touch a few delicate areas where I'm genuinely not sure if the conda/virtualenv support warrants this. Call for @ogulcancelik to make.

JJLiebig mentioned this pull request Sep 13, 2026

fix: keep conda and virtualenv activation across session restore #2367

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JJLiebig force-pushed the takeover/2367-restore-pane-virtual-env branch from 1dfb061 to 9a00338 Compare September 13, 2026 00:25

greptile-apps Bot reviewed Sep 13, 2026

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Comment thread src/platform/linux.rs

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JJLiebig force-pushed the takeover/2367-restore-pane-virtual-env branch from 9a00338 to cb91320 Compare September 13, 2026 00:32

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Comment thread src/persist/snapshot.rs Outdated

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Comment thread src/pane.rs

JJLiebig force-pushed the takeover/2367-restore-pane-virtual-env branch from cb91320 to 50a0d89 Compare September 13, 2026 00:57

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Comment thread src/persist/snapshot.rs

JJLiebig force-pushed the takeover/2367-restore-pane-virtual-env branch from 50a0d89 to 5fd6851 Compare September 13, 2026 01:05

greptile-apps Bot approved these changes Sep 13, 2026

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JJLiebig requested a review from ogulcancelik September 13, 2026 01:14

SurfRid3r mentioned this pull request Sep 14, 2026

Panes inherit stale host-terminal session identity (ITERM_SESSION_ID / TERM_PROGRAM) from the server's originating session #4104

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