The real issue here was that I needed to log in so the FUSE filesystem would be available again.
Error: Unknown system error -126: Unknown system error -126, mkdir '<redacted>'
at Error (native)
at Object.fs.mkdirSync (fs.js:842:18)
at Function.sync (/usr/share/atom/resources/app.asar/node_modules/fs-plus/node_modules/mkdirp/index.js:55:12)
at Object.fsPlus.writeFileSync (/usr/share/atom/resources/app.asar/node_modules/fs-plus/lib/fs-plus.js:278:14)
at File.module.exports.File.writeFileSync (/usr/share/atom/resources/app.asar/node_modules/text-buffer/node_modules/pathwatcher/lib/file.js:285:19)
at File.module.exports.File.writeFileWithPrivilegeEscalationSync (/usr/share/atom/resources/app.asar/node_modules/text-buffer/node_modules/pathwatcher/lib/file.js:463:21)
at File.module.exports.File.writeSync (/usr/share/atom/resources/app.asar/node_modules/text-buffer/node_modules/pathwatcher/lib/file.js:380:12)
at TextBuffer.module.exports.TextBuffer.saveAs (/usr/share/atom/resources/app.asar/node_modules/text-buffer/lib/text-buffer.js:1142:19)
at TextBuffer.module.exports.TextBuffer.save (/usr/share/atom/resources/app.asar/node_modules/text-buffer/lib/text-buffer.js:1126:19)
at TextEditor.module.exports.TextEditor.save (/usr/share/atom/resources/app.asar/src/text-editor.js:743:26)
at Pane.module.exports.Pane.saveItem (/usr/share/atom/resources/app.asar/src/pane.js:734:18)
at Pane.saveItem (/usr/share/atom/resources/app.asar/src/pane.js:3:61)
at Pane.module.exports.Pane.saveActiveItem (/usr/share/atom/resources/app.asar/src/pane.js:717:19)
at Workspace.module.exports.Workspace.saveActivePaneItem (/usr/share/atom/resources/app.asar/src/workspace.js:699:35)
at atom-workspace.commandRegistry.add.core:save (/usr/share/atom/resources/app.asar/src/register-default-commands.js:220:32)
at CommandRegistry.module.exports.CommandRegistry.handleCommandEvent (/usr/share/atom/resources/app.asar/src/command-registry.js:260:29)
at /usr/share/atom/resources/app.asar/src/command-registry.js:3:61
at KeymapManager.module.exports.KeymapManager.dispatchCommandEvent (/usr/share/atom/resources/app.asar/node_modules/atom-keymap/lib/keymap-manager.js:580:16)
at KeymapManager.module.exports.KeymapManager.handleKeyboardEvent (/usr/share/atom/resources/app.asar/node_modules/atom-keymap/lib/keymap-manager.js:388:22)
at WindowEventHandler.module.exports.WindowEventHandler.handleDocumentKeyEvent (/usr/share/atom/resources/app.asar/src/window-event-handler.js:98:36)
at HTMLDocument.<anonymous> (/usr/share/atom/resources/app.asar/src/window-event-handler.js:3:61)
The real issue here was that I needed to log in so the FUSE filesystem would be available again.