macOS: move-to-Applications prompt + fix Sparkle helper permissions#12
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Sparkle cannot update an app running from Downloads, a mounted DMG, or an App Translocation path. Prompt once at startup, copy the bundle to /Applications (falling back to ~/Applications), strip quarantine so Gatekeeper does not translocate the copy, trash the old copy when deletable, and relaunch from the new location.
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install(DIRECTORY) defaults every file to 644, which stripped the execute bits from Sparkle's Autoupdate, Updater.app, and XPC helpers. launchd then refused to run them (errno 13) and every macOS update died with Sparkle's generic updater error.
johnqherman
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Two macOS updater fixes:
1. Move to Applications prompt. Sparkle refuses to update an app running from its download location (Downloads, mounted DMG, App Translocation path). On launch, when the bundle is outside /Applications, offer to move it: copy to /Applications (fallback ~/Applications), strip quarantine so the copy is not translocated, trash the old bundle when deletable, relaunch. Declining is remembered.
2. Sparkle helpers shipped non-executable. install(DIRECTORY) defaults files to 644, stripping execute bits from Sparkle's Autoupdate, Updater.app, and XPC services. launchd refused to exec them (errno 13, confirmed in Console logs) and every update failed with Sparkle's generic updater error. Fixed with USE_SOURCE_PERMISSIONS.