Add retry to brew calls (#111)

Author: alugowski

.github/workflows/wheels.yml

@@ -126,11 +126,11 @@ jobs:
         # GitHub actions comes with libomp already installed, but for its native arch only. Must build universal one
         # manually so that both x86 and arm builds can be built.
         run: |
-          brew install coreutils
-          brew install libomp
+          brew fetch --retry coreutils && brew install coreutils
+          brew fetch --retry libomp && brew install libomp
           if [[ ${{ matrix.cibw_archs }} == "arm64" ]] ; then
             echo "Building universal libomp manually"
-            sh add_arm_to_libomp_dylib.sh
+            sh add_arm_to_libomp_dylib.sh || exit 1
           fi
 
       - uses: pypa/cibuildwheel@v2.16

add_arm_to_libomp_dylib.sh

@@ -20,13 +20,14 @@ if [ "$(arch)" != "x86_64" ] && [ "$(arch)" != "i386" ]; then
 fi
 
 set -x  # echo on
+set -e  # fail fast
 
 #mkdir x86lib
 mkdir armlib
 
 # download and unzip both x86 and arm libomp tarballs
-#brew fetch --force --bottle-tag=x86_64_monterey libomp
-brew fetch --force --bottle-tag=arm64_big_sur libomp
+#brew fetch --retry --force --bottle-tag=x86_64_monterey libomp
+brew fetch --retry --force --bottle-tag=arm64_big_sur libomp
 
 # untar
 #tar -xzf $(brew --cache --bottle-tag=x86_64_monterey libomp) --strip-components 2 -C x86lib