Fix regression in --allow-local-files option with Snapd Chromium

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Fixed
+
+- Fix regression in `--allow-local-files` option with Snapd Chromium ([#201](https://github.com/marp-team/marp-cli/issues/201), [#283](https://github.com/marp-team/marp-cli/pull/283))
+
 ## v0.21.0 - 2020-08-20
 
 ### Added

src/converter.ts

@@ -348,8 +348,6 @@ export class Converter {
     baseFile: File,
     processer: (page: puppeteer.Page, uri: string) => Promise<T>
   ) {
-    const { executablePath } = generatePuppeteerLaunchArgs()
-
     const tmpFile: File.TmpFileInterface | undefined = await (() => {
       if (!this.options.allowLocalFiles) return undefined
 
@@ -358,12 +356,11 @@ export class Converter {
       )
 
       // Snapd Chromium cannot access from sandbox container to user-land `/tmp`
-      // directory so create tmp file to home directory if executed Chromium was
-      // placed in `/snap`.
-      const home =
-        process.platform === 'linux' && executablePath?.startsWith('/snap/')
-
-      return baseFile.saveTmpFile({ home, extension: '.html' })
+      // directory so create tmp file to home directory if in Linux.
+      return baseFile.saveTmpFile({
+        home: process.platform === 'linux',
+        extension: '.html',
+      })
     })()
 
     const uri = await (async () => {
@@ -377,29 +374,28 @@ export class Converter {
     try {
       const browser = await Converter.runBrowser()
       const page = await browser.newPage()
-      const {
-        missingFileSet: missingTracker,
-        failedFileSet: failedTracker,
-      } = this.trackFailedLocalFileAccess(page)
+      const { missingFileSet, failedFileSet } = this.trackFailedLocalFileAccess(
+        page
+      )
 
       try {
         return await processer(page, uri)
       } finally {
-        if (missingTracker.size > 0) {
+        if (missingFileSet.size > 0) {
           warn(
-            `${missingTracker.size > 1 ? 'Some of t' : 'T'}he local file${
-              missingTracker.size > 1 ? 's are' : ' is'
+            `${missingFileSet.size > 1 ? 'Some of t' : 'T'}he local file${
+              missingFileSet.size > 1 ? 's are' : ' is'
             } missing and will be ignored. Make sure the file path${
-              missingTracker.size > 1 ? 's are' : ' is'
+              missingFileSet.size > 1 ? 's are' : ' is'
             } correct.`
           )
         }
-        if (failedTracker.size > 0) {
+        if (failedFileSet.size > 0) {
           warn(
             `Marp CLI has detected accessing to local file${
-              failedTracker.size > 1 ? 's' : ''
+              failedFileSet.size > 1 ? 's' : ''
             }. ${
-              failedTracker.size > 1 ? 'They are' : 'That is'
+              failedFileSet.size > 1 ? 'They are' : 'That is'
             } blocked by security reason. Instead we recommend using assets uploaded to online. (Or you can use ${chalk.yellow(
               '--allow-local-files'
             )} option if you are understood of security risk)`

src/file.ts

@@ -106,10 +106,9 @@ export class File {
   async saveTmpFile(
     opts: { extension?: string; home?: boolean } = {}
   ): Promise<File.TmpFileInterface> {
-    const tmp: string = await tmpNamePromise({
-      dir: opts.home ? os.homedir() : undefined,
-      postfix: opts.extension,
-    })
+    let tmp: string = await tmpNamePromise({ postfix: opts.extension })
+
+    if (opts.home) tmp = path.join(os.homedir(), path.basename(tmp))
 
     await this.saveToFile(tmp)