Retry gem compare ... commands and others (#3)

Try to make the action more stable (main issue is fedora-ruby/gem-compare#31)

Author: dentarg

action.yml

@@ -33,7 +33,7 @@ runs:
         echo "PR_NUMBER=${{ github.event.pull_request.number || inputs.pr_number }}" >> $GITHUB_ENV
         echo "PR_TITLE=${{ github.event.pull_request.title || inputs.pr_title }}" >> $GITHUB_ENV
 
-    # So the "parse_title" script can be found?
+    # Ensure our scripts can be found when running the action
     # https://docs.github.com/en/actions/creating-actions/creating-a-composite-action#creating-an-action-metadata-file
     - run: echo "${{ github.action_path }}" >> $GITHUB_PATH
       shell: bash
@@ -48,17 +48,17 @@ runs:
     - name: Run gem install gem-compare
       shell: bash
       run: |
-        gem install gem-compare --version ${{ inputs.gem_compare_version }}
+        with_retries gem install gem-compare --version ${{ inputs.gem_compare_version }}
 
     - name: Run gem compare
       shell: bash
       run: |
-        gem compare $COMPARE_GEM $COMPARE_FROM_VERSION $COMPARE_TO_VERSION > compare_output.txt
+        with_retries gem compare $COMPARE_GEM $COMPARE_FROM_VERSION $COMPARE_TO_VERSION > compare_output.txt
 
     - name: Run gem compare --diff
       shell: bash
       run: |
-        gem compare --diff $COMPARE_GEM $COMPARE_FROM_VERSION $COMPARE_TO_VERSION > compare_diff.txt
+        with_retries gem compare --diff $COMPARE_GEM $COMPARE_FROM_VERSION $COMPARE_TO_VERSION > compare_diff.txt
 
     - name: Run gh pr comment
       shell: bash
@@ -80,5 +80,5 @@ runs:
         echo '````'                    >> comment2.txt
         echo '</Details>'              >> comment2.txt
 
-        gh pr comment $PR_NUMBER --body-file comment1.txt --repo ${{ github.repository }}
+        with_retries gh pr comment $PR_NUMBER --body-file comment1.txt --repo ${{ github.repository }}
         gh pr comment $PR_NUMBER --body-file comment2.txt --repo ${{ github.repository }} || true

with_retries

@@ -0,0 +1,31 @@
+#!/bin/bash
+
+# Modified version of travis_retry
+# https://github.com/travis-ci/travis-build/blob/04a1963de816b8618bb3d7e2e22d873f05ab4091/lib/travis/build/bash/travis_retry.bash
+
+SLEEP_SECONDS=5
+RETRY_COUNT=5
+
+retry_command() {
+  local result=0
+  local count=1
+  while [[ "${count}" -le $RETRY_COUNT ]]; do
+    [[ "${result}" -ne 0 ]] && {
+      echo -e "\\n${ANSI_RED}The command \"${*}\" failed. Retrying, ${count} of ${RETRY_COUNT}.${ANSI_RESET}\\n" >&2
+    }
+    # run the command in a way that doesn't disable setting `errexit`
+    "${@}"
+    result="${?}"
+    if [[ $result -eq 0 ]]; then break; fi
+    count="$((count + 1))"
+    sleep $SLEEP_SECONDS
+  done
+
+  [[ "${count}" -gt ${RETRY_COUNT} ]] && {
+    echo -e "\\n${ANSI_RED}The command \"${*}\" failed ${RETRY_COUNT} times.${ANSI_RESET}\\n" >&2
+  }
+
+  return "${result}"
+}
+
+retry_command "$@"