zed-industries/zed · error

failed to mount: {:?}

Error message

failed to mount: {:?}

What it means

macOS install step: the downloaded .dmg is mounted with `hdiutil attach -nobrowse -mountroot <temp>`; failure reports hdiutil's stderr, which typically names the cause (corrupt image, resource busy, unrecognized format).

Source

Thrown at crates/auto_update/src/auto_update.rs:1182

    let running_app_filename = running_app_path
        .file_name()
        .with_context(|| format!("invalid running app path {running_app_path:?}"))?;

    let mount_path = temp_dir.path().join("Zed");
    let mut mounted_app_path: OsString = mount_path.join(running_app_filename).into();

    mounted_app_path.push("/");
    let mut cmd = new_command("hdiutil");
    cmd.args(["attach", "-nobrowse"])
        .arg(&downloaded_dmg)
        .arg("-mountroot")
        .arg(temp_dir.path());
    let output = cmd
        .output()
        .await
        .with_context(|| "failed to mount: {cmd}")?;

    anyhow::ensure!(
        output.status.success(),
        "failed to mount: {:?}",
        String::from_utf8_lossy(&output.stderr)
    );

    let unmounter = MacOsUnmounter {
        mount_path: mount_path.clone(),
        background_executor,
    };

    let mut cmd = new_command("rsync");
    cmd.args(["-av", "--delete", "--exclude", "Icon?"])
        .arg(&mounted_app_path)
        .arg(&running_app_path);
    let rsync_output = cmd.output().await;

    // Await the unmount (even if rsync failed) so that the installer temp dir
    // can be deleted once this function returns.

View on GitHub (pinned to bc538def45)

Solutions

1. Retry the update to get a clean download.
2. Reproduce manually: `hdiutil attach -nobrowse <cached.dmg>` and read the error.
3. Check security software settings for disk-image interception.
4. Download the .dmg from zed.dev and install by hand if mounts keep failing.

on mount failure, discard the cached dmg and retry the full update once (a fresh download usually fixes corrupt images); report only if the second attempt fails.

When it happens

Trigger: hdiutil attach exits non-zero - corrupt or truncated dmg, another mount in flight, DiskArbitration denied, or a quarantine/Gatekeeper block on the downloaded image.

Common situations: Truncated downloads; security software intercepting disk mounts; macOS notarization/mount policy changes; concurrent updates racing mounts.

Related errors

• Could not auto-update because the required rsync utility was
• failed to copy app: {:?}
• Could not parse screen resolution
• failed to fetch release: {:?}
• failed to download remote server release: {:?}

AI-assisted analysis of zed-industries/zed@bc538def45 (2026-08-16). Data as JSON: /api/errors/a932c6518ed93ffb. Report an issue: GitHub.