Add extrastatic publishing

To publish into ExtraStatic the CI file has a bunch of SSH configuration that looks messy. This PR aims to replace that with a a single yarn publish command.

svekyll/cli.js

@@ -4,12 +4,12 @@ import { viteSingleFile } from 'vite-plugin-singlefile';
 import { build } from 'vite';
 import tailwindcss from 'tailwindcss';
 
-import { spawn } from 'child_process';
+import { spawn, spawnSync } from 'child_process';
 import fsExtra from 'fs-extra';
 
 const { version } = JSON.parse(
   fs
-    .readFileSync("./node_modules/svekyll-cli/package.json")
+    .readFileSync(process.env.OVERRIDE_PACKAGE_JSON || "./node_modules/svekyll-cli/package.json")
     .toString());
 
 import pkg from 'yaml';
@@ -183,7 +183,7 @@ function interpolatePostsAndStyle( { svekyllCss, userCss }, contents, _imports)
              userCss );
 }
 
-async function getDiffList(filename) {
+export async function getDiffList(filename) {
   return new Promise( (resolve, reject) => {
     const cmd = spawn('git', ['log',
 			      '--format="%h -- %d -- %cd -- %s"',
@@ -300,10 +300,10 @@ async function getDiffContent(sha1, sha2, filename) {
   });
 }
 
-async function getDiff({ metadata, config, filename, revisions } ) {
+export async function getDiff({ metadata, config, filename, revisions } ) {
   return new Promise( async (resolve, reject) => {
     process.env.VERBOSE && console.log('YFM', metadata );
-    if (metadata.revisions_disabled) {
+    if (metadata && metadata.revisions_disabled) {
       process.env.VERBOSE && console.log('Revisions disabled for this post');
       resolve();
     } else {
@@ -928,6 +928,45 @@ export async function getVersion() {
   return `Built with svekyll-cli v${version}${sha ? ",sha:" + sha : ""}`;
 }
 
+export function publish() {
+  const host = process.env.PUBLISHING_HOST || 'pages.extrastatic.com';
+  const jobId = process.env.CI_JOB_ID;
+  const path = `pages/${process.env.CI_PROJECT_NAMESPACE}/${process.env.CI_PROJECT_NAME}/${jobId}`;
+  const mkdirCmd = ['ssh',
+		    [ '-i',
+		      '/ssh/extrastatic-ssh',
+		      `pages@${host}`,
+		      `mkdir -p ${path}`
+		   ];
+  const scpCmd = [ 'scp',  [ '-r',
+			     '-o',
+			     'StrictHostKeyChecking=no',
+			     '-o',
+			     'UserKnownHostsFile=/dev/null',
+			     '-i',
+			     '/ssh/extrastatic-ssh',
+			     'public',
+			     `pages@${host}:${path}`
+			   ]
+		 ];
+  metafile();
+  const copyManifestCmd = ['scp',
+			   [ '-r', '-o',
+			     'StrictHostKeyChecking=no',
+			     '-o',
+			     'UserKnownHostsFile=/dev/null',
+			     '-i',
+			     '/ssh/extrastatic-ssh',
+			     `${jobId}.json`,
+			     `pages@${host}:manifests/${$jobId}.json`
+			   ]
+			  ];
+  
+  [ mkdirCmd, scpCmd, copyManifestCmd ].forEach( [cmd,...rest] => {
+    spawnSync( cmd, rest );
+  });
+}
+
 export function renameIndex() {
   fs.renameSync("./build/page/0/index.html", "./build/index.html");
 }