dsh 0.2.0-rc.2: in-container update (experimental channel), path-agnostic compose, upstream patches adapted to 0.1.x/0.2.x

upstream/container/platform/lib/atomic.mjs

@@ -0,0 +1,46 @@
+import { link, mkdir, open, rename, rm } from 'node:fs/promises'
+import { randomUUID } from 'node:crypto'
+import { dirname } from 'node:path'
+
+async function syncDirectory(path) {
+  const handle = await open(path, 'r')
+  try {
+    await handle.sync()
+  } finally {
+    await handle.close()
+  }
+}
+
+async function temporaryFile(path, bytes, mode) {
+  await mkdir(dirname(path), { recursive: true })
+  const temporary = `${path}.${randomUUID()}.tmp`
+  const handle = await open(temporary, 'wx', mode)
+  try {
+    await handle.writeFile(bytes)
+    await handle.sync()
+  } finally {
+    await handle.close()
+  }
+  return temporary
+}
+
+export async function durableReplace(path, bytes, mode = 0o600) {
+  const temporary = await temporaryFile(path, bytes, mode)
+  try {
+    await rename(temporary, path)
+    await syncDirectory(dirname(path))
+  } catch (error) {
+    await rm(temporary, { force: true })
+    throw error
+  }
+}
+
+export async function durableCreate(path, bytes, mode = 0o600) {
+  const temporary = await temporaryFile(path, bytes, mode)
+  try {
+    await link(temporary, path)
+    await syncDirectory(dirname(path))
+  } finally {
+    await rm(temporary, { force: true })
+  }
+}