⚡ Optimize file I/O in update.ps1

Refactored the Dockerfile processing loop in update.ps1 to implement a
read-modify-write pattern. Instead of multiple sequential reads and
writes for each replacement, the file is now read once into a variable,
all replacements are performed in memory, and the final content is written
back once.

Additionally, optimized directory name retrieval by using the existing
FileInfo object's Directory property instead of calling Get-Item.

This change reduces the number of file I/O operations from up to 8 reads
and 8 writes down to 1 read and 1 write per file, significantly improving
the performance of the update script.

Co-authored-by: keeganwitt <[email protected]>

Author: google-labs-jules[bot]

update.ps1

@@ -35,35 +35,38 @@ Write-Host "Graal 25 AMD64 hash is $graal25amd64Hash"
 Write-Host "Graal 25 AARCH64 hash is $graal25aarch64Hash"
 
 dir -Recurse -Filter Dockerfile | ForEach-Object {
-    (Get-Content -Path $_.FullName) -replace "ENV GRADLE_VERSION=.+$", "ENV GRADLE_VERSION=${gradleVersion}" | Set-Content $_.FullName
-    (Get-Content -Path $_.FullName) -replace "GRADLE_DOWNLOAD_SHA256=.+$", "GRADLE_DOWNLOAD_SHA256=${sha}" | Set-Content $_.FullName
-    if ($((Get-Item $_.FullName).Directory.Name) -eq "jdk17-noble-graal" -Or $((Get-Item $_.FullName).Directory.Name) -eq "jdk17-jammy-graal")
+    $content = Get-Content -Path $_.FullName
+    $content = $content -replace "ENV GRADLE_VERSION=.+$", "ENV GRADLE_VERSION=${gradleVersion}"
+    $content = $content -replace "GRADLE_DOWNLOAD_SHA256=.+$", "GRADLE_DOWNLOAD_SHA256=${sha}"
+    $dirName = $_.Directory.Name
+    if ($dirName -eq "jdk17-noble-graal" -Or $dirName -eq "jdk17-jammy-graal")
     {
-        (Get-Content -Path $_.FullName) -replace "JAVA_VERSION=[^ ]+", "JAVA_VERSION=${graal17Version}" | Set-Content $_.FullName
-        (Get-Content -Path $_.FullName) -replace "GRAALVM_AMD64_DOWNLOAD_SHA256=[^ ]+", "GRAALVM_AMD64_DOWNLOAD_SHA256=${graal17amd64Hash}" | Set-Content $_.FullName
-        (Get-Content -Path $_.FullName) -replace "GRAALVM_AARCH64_DOWNLOAD_SHA256=[^ ]+", "GRAALVM_AARCH64_DOWNLOAD_SHA256=${graal17aarch64Hash}" | Set-Content $_.FullName
+        $content = $content -replace "JAVA_VERSION=[^ ]+", "JAVA_VERSION=${graal17Version}"
+        $content = $content -replace "GRAALVM_AMD64_DOWNLOAD_SHA256=[^ ]+", "GRAALVM_AMD64_DOWNLOAD_SHA256=${graal17amd64Hash}"
+        $content = $content -replace "GRAALVM_AARCH64_DOWNLOAD_SHA256=[^ ]+", "GRAALVM_AARCH64_DOWNLOAD_SHA256=${graal17aarch64Hash}"
     }
-    elseif ($((Get-Item $_.FullName).Directory.Name) -eq "jdk21-noble-graal" -Or $((Get-Item $_.FullName).Directory.Name) -eq "jdk21-jammy-graal")
+    elseif ($dirName -eq "jdk21-noble-graal" -Or $dirName -eq "jdk21-jammy-graal")
     {
-        (Get-Content -Path $_.FullName) -replace "JAVA_VERSION=[^ ]+", "JAVA_VERSION=${graal21Version}" | Set-Content $_.FullName
-        (Get-Content -Path $_.FullName) -replace "GRAALVM_AMD64_DOWNLOAD_SHA256=[^ ]+", "GRAALVM_AMD64_DOWNLOAD_SHA256=${graal21amd64Hash}" | Set-Content $_.FullName
-        (Get-Content -Path $_.FullName) -replace "GRAALVM_AARCH64_DOWNLOAD_SHA256=[^ ]+", "GRAALVM_AARCH64_DOWNLOAD_SHA256=${graal21aarch64Hash}" | Set-Content $_.FullName
+        $content = $content -replace "JAVA_VERSION=[^ ]+", "JAVA_VERSION=${graal21Version}"
+        $content = $content -replace "GRAALVM_AMD64_DOWNLOAD_SHA256=[^ ]+", "GRAALVM_AMD64_DOWNLOAD_SHA256=${graal21amd64Hash}"
+        $content = $content -replace "GRAALVM_AARCH64_DOWNLOAD_SHA256=[^ ]+", "GRAALVM_AARCH64_DOWNLOAD_SHA256=${graal21aarch64Hash}"
     }
-    elseif ($((Get-Item $_.FullName).Directory.Name) -eq "jdk25-noble-graal")
+    elseif ($dirName -eq "jdk25-noble-graal")
     {
-        (Get-Content -Path $_.FullName) -replace "JAVA_VERSION=[^ ]+", "JAVA_VERSION=${graal25Version}" | Set-Content $_.FullName
-        (Get-Content -Path $_.FullName) -replace "GRAALVM_AMD64_DOWNLOAD_SHA256=[^ ]+", "GRAALVM_AMD64_DOWNLOAD_SHA256=${graal25amd64Hash}" | Set-Content $_.FullName
-        (Get-Content -Path $_.FullName) -replace "GRAALVM_AARCH64_DOWNLOAD_SHA256=[^ ]+", "GRAALVM_AARCH64_DOWNLOAD_SHA256=${graal25aarch64Hash}" | Set-Content $_.FullName
+        $content = $content -replace "JAVA_VERSION=[^ ]+", "JAVA_VERSION=${graal25Version}"
+        $content = $content -replace "GRAALVM_AMD64_DOWNLOAD_SHA256=[^ ]+", "GRAALVM_AMD64_DOWNLOAD_SHA256=${graal25amd64Hash}"
+        $content = $content -replace "GRAALVM_AARCH64_DOWNLOAD_SHA256=[^ ]+", "GRAALVM_AARCH64_DOWNLOAD_SHA256=${graal25aarch64Hash}"
     }
-    elseif ($((Get-Item $_.FullName).Directory.Name) -eq "jdk-lts-and-current-graal")
+    elseif ($dirName -eq "jdk-lts-and-current-graal")
     {
-        (Get-Content -Path $_.FullName) -replace "JAVA_LTS_VERSION=[^ ]+", "JAVA_LTS_VERSION=${graal25Version}" | Set-Content $_.FullName
-        (Get-Content -Path $_.FullName) -replace "GRAALVM_LTS_AMD64_DOWNLOAD_SHA256=[^ ]+", "GRAALVM_LTS_AMD64_DOWNLOAD_SHA256=${graal25amd64Hash}" | Set-Content $_.FullName
-        (Get-Content -Path $_.FullName) -replace "GRAALVM_LTS_AARCH64_DOWNLOAD_SHA256=[^ ]+", "GRAALVM_LTS_AARCH64_DOWNLOAD_SHA256=${graal25aarch64Hash}" | Set-Content $_.FullName
-        (Get-Content -Path $_.FullName) -replace "JAVA_CURRENT_VERSION=[^ ]+", "JAVA_CURRENT_VERSION=${graal25Version}" | Set-Content $_.FullName
-        (Get-Content -Path $_.FullName) -replace "GRAALVM_CURRENT_AMD64_DOWNLOAD_SHA256=[^ ]+", "GRAALVM_CURRENT_AMD64_DOWNLOAD_SHA256=${graal25amd64Hash}" | Set-Content $_.FullName
-        (Get-Content -Path $_.FullName) -replace "GRAALVM_CURRENT_AARCH64_DOWNLOAD_SHA256=[^ ]+", "GRAALVM_CURRENT_AARCH64_DOWNLOAD_SHA256=${graal25aarch64Hash}" | Set-Content $_.FullName
+        $content = $content -replace "JAVA_LTS_VERSION=[^ ]+", "JAVA_LTS_VERSION=${graal25Version}"
+        $content = $content -replace "GRAALVM_LTS_AMD64_DOWNLOAD_SHA256=[^ ]+", "GRAALVM_LTS_AMD64_DOWNLOAD_SHA256=${graal25amd64Hash}"
+        $content = $content -replace "GRAALVM_LTS_AARCH64_DOWNLOAD_SHA256=[^ ]+", "GRAALVM_LTS_AARCH64_DOWNLOAD_SHA256=${graal25aarch64Hash}"
+        $content = $content -replace "JAVA_CURRENT_VERSION=[^ ]+", "JAVA_CURRENT_VERSION=${graal25Version}"
+        $content = $content -replace "GRAALVM_CURRENT_AMD64_DOWNLOAD_SHA256=[^ ]+", "GRAALVM_CURRENT_AMD64_DOWNLOAD_SHA256=${graal25amd64Hash}"
+        $content = $content -replace "GRAALVM_CURRENT_AARCH64_DOWNLOAD_SHA256=[^ ]+", "GRAALVM_CURRENT_AARCH64_DOWNLOAD_SHA256=${graal25aarch64Hash}"
     }
+    $content | Set-Content $_.FullName
 }
 
 (Get-Content -Path .github/workflows/ci.yaml) -replace "expectedGradleVersion: .+", "expectedGradleVersion: '${gradleVersion}'" | Set-Content .github/workflows/ci.yaml