make artifacts: remove dependency on GNU coreutils

Part of issue 81

Signed-off-by: Akihiro Suda <[email protected]>

Author: AkihiroSuda

.github/workflows/qemu.yaml

@@ -40,7 +40,7 @@ jobs:
         run: launchctl print system/io.github.lima-vm.socket_vmnet
       - name: Install test dependencies
         run: |
-          brew install qemu bash coreutils
+          brew install qemu bash
       - name: Test (shared mode)
         run: ./test/test.sh /var/run/socket_vmnet
       # Bridged mode cannot be tested on GHA

.github/workflows/release.yaml

@@ -32,9 +32,8 @@ jobs:
           fetch-depth: 0
           ref: ${{ github.event.pull_request.head.sha }}
       - name: "Install dependencies"
-        # coreutils:  For `gtouch -d @${SOURCE_DATE_EPOCH}`
         # diffoscope: For `make test.repro`
-        run: brew install coreutils diffoscope
+        run: brew install diffoscope
       - name: "Test reproducibility"
         run: |
           make test.repro

Makefile

@@ -5,9 +5,10 @@ PREFIX ?= /opt/socket_vmnet
 DEBUG ?=
 
 export SOURCE_DATE_EPOCH ?= $(shell git log -1 --pretty=%ct)
+SOURCE_DATE_EPOCH_ISO8601 := $(shell date -u -Iseconds -r $(SOURCE_DATE_EPOCH) | sed -e s/+00:00/Z/)
 # https://reproducible-builds.org/docs/archives/
 TAR ?= gtar --sort=name --mtime="@$(SOURCE_DATE_EPOCH)" --owner=0 --group=0 --numeric-owner --pax-option=exthdr.name=%d/PaxHeaders/%f,delete=atime,delete=ctime
-TOUCH ?= gtouch -d @$(SOURCE_DATE_EPOCH)
+TOUCH ?= touch -d $(SOURCE_DATE_EPOCH_ISO8601)
 # Not necessary to use GNU's gzip
 GZIP ?= gzip -9 -n
 DIFFOSCOPE ?= diffoscope