ci: add script to update rootfs URL (#131)

Issue #, if available:

runfinch/finch#492

*Description of changes:*

for Finch on Windows runfinch/finch#492, we need to provide a rootfs to
WSL2. This rootfs lives in our dependencies bucket, and will be updated
from time-to-time for security patches, bug fixes, etc. This commit will
automatically pull the most recent rootfs from the depenedencies bucket
as part of the Update Deps action.

*Testing done:*

locally run script with FINCH_ROOTFS_URL ?=
https://deps.runfinch.com/finch-rootfs-production-amd64-000000000.tar.zst
set in Makefile, observe update.


- [x] I've reviewed the guidance in CONTRIBUTING.md


#### License Acceptance

By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 license.

Signed-off-by: Gavin Inglis <giinglis@amazon.com>

.github/workflows/rootfs.yaml

@@ -20,6 +20,7 @@ jobs:
     strategy:
       matrix:
         arch: ['amd64', 'arm64']
+        platform: ['common']
     steps:
       - name: Generate Timestamp
         id: timestamp
@@ -63,4 +64,9 @@ jobs:
 
           zstd -z -18 finch-rootfs-production-${{ matrix.arch }}.tar -o finch-rootfs-production-${{ matrix.arch }}-"$TIMESTAMP".tar.zst
 
-          aws s3 cp ./finch-rootfs-production-${{ matrix.arch }}-"$TIMESTAMP".tar.zst s3://${{ secrets.DEPENDENCY_BUCKET_NAME }} 
+          ARCHPATH="x86-64"
+          if [ ${{ matrix.arch }} == "arm64" ]; then
+            ARCHPATH="aarch64"
+          fi
+
+          aws s3 cp ./finch-rootfs-production-${{ matrix.arch }}-"$TIMESTAMP".tar.zst s3://${{ secrets.DEPENDENCY_BUCKET_NAME }}/${{ matrix.platform }}/$ARCHPATH/

.github/workflows/update-dependencies.yaml

@@ -29,6 +29,7 @@ jobs:
       - name: update dependencies url
         run: |
           ./bin/update-deps.sh -d ${{ secrets.DEPENDENCY_BUCKET_NAME }}
+          ./bin/update-rootfs.sh -d ${{ secrets.DEPENDENCY_BUCKET_NAME }}
 
       - name: create PR
         uses: peter-evans/create-pull-request@v5

Makefile

@@ -31,13 +31,19 @@ ifneq (,$(findstring arm64,$(ARCH)))
 	FINCH_OS_IMAGE_URL := $(FINCH_OS_AARCH64_URL)
 	FINCH_OS_DIGEST ?= $(FINCH_OS_AARCH64_DIGEST)
 	HOMEBREW_PREFIX ?= /opt/homebrew
+
+	# TODO: Use Finch rootfs in Finch on Windows testing
+	FINCH_ROOTFS_URL ?= https://deps.runfinch.com/common/aarch64/finch-rootfs-production-arm64-1690563031.tar.zst
 else ifneq (,$(findstring x86_64,$(ARCH)))
 	LIMA_ARCH = x86_64
 	LIMA_URL ?= https://deps.runfinch.com/x86-64/lima-and-qemu.macos-x86_64.1689037160.tar.gz
 	FINCH_OS_BASENAME := $(notdir $(FINCH_OS_x86_URL))
 	FINCH_OS_IMAGE_URL := $(FINCH_OS_x86_URL)
 	FINCH_OS_DIGEST ?= $(FINCH_OS_x86_DIGEST)
 	HOMEBREW_PREFIX ?= /usr/local
+
+	# TODO: Use Finch rootfs in Finch on Windows testing
+	FINCH_ROOTFS_URL ?= https://deps.runfinch.com/common/x86-64/finch-rootfs-production-amd64-1690563027.tar.zst
 endif
 
 FINCH_OS_IMAGE_LOCATION ?= $(OUTDIR)/os/$(FINCH_OS_BASENAME)

bin/update-rootfs.sh

@@ -0,0 +1,29 @@
+#!/bin/sh
+set -euxo pipefail
+
+DEPENDENCY_CLOUDFRONT_URL="https://deps.runfinch.com/"
+AARCH64_FILENAME_PATTERN="common/aarch64/finch-rootfs-production-arm64-[0-9].*\.tar.zst$"
+AMD64_FILENAME_PATTERN="common/x86-64/finch-rootfs-production-amd64-[0-9].*\.tar.zst$"
+PLATFORM="common"
+AARCH64="aarch64"
+X86_64="x86-64"
+
+while getopts d: flag
+do
+        case "${flag}" in
+            d) dependency_bucket=${OPTARG};;
+         esac
+done
+
+[[ -z "$dependency_bucket" ]] && { echo "Error: Dependency bucket not set"; exit 1; }
+
+aarch64Deps=$(aws s3 ls s3://${dependency_bucket}/${PLATFORM}/${AARCH64} | grep "$AARCH64_FILENAME_PATTERN" | sort | tail -n 1 | awk '{print $4}')
+
+[[ -z "$aarch64Deps" ]] && { echo "Error: aarch64 dependency not found"; exit 1; }
+
+amd64Deps=$(aws s3 ls s3://${dependency_bucket}/${PLATFORM}/${X86_64} | grep "$AMD64_FILENAME_PATTERN" | sort | tail -n 1 | awk '{print $4}')
+
+[[ -z "$amd64Deps" ]] && { echo "Error: x86_64 dependency not found"; exit 1; }
+
+sed -E  -i.bak  's|^([[:blank:]]*FINCH_ROOTFS_URL[[:blank:]]*\?=[[:blank:]]*'${DEPENDENCY_CLOUDFRONT_URL}')('${AARCH64_FILENAME_PATTERN}')|\1'$aarch64Deps'|' Makefile
+sed -E  -i.bak  's|^([[:blank:]]*FINCH_ROOTFS_URL[[:blank:]]*\?=[[:blank:]]*'${DEPENDENCY_CLOUDFRONT_URL}')('${AMD64_FILENAME_PATTERN}')|\1'$amd64Deps'|'  Makefile