[BLD] Add script that fails build if git tags do not exist (#27770)

Author: qwhelan

.travis.yml

@@ -21,7 +21,7 @@ env:
 
 git:
  # for cloning
- depth: 2000
+ depth: false
 
 matrix:
  fast_finish: true
@@ -63,7 +63,7 @@ before_install:
  - pwd
  - uname -a
  - git --version
- - git tag
+ - ./ci/check_git_tags.sh
  # Because travis runs on Google Cloud and has a /etc/boto.cfg,
  # it breaks moto import, see:
  # https://github.com/spulec/moto/issues/1771

ci/check_git_tags.sh

@@ -0,0 +1,28 @@
+set -e
+
+if [[ ! $(git tag) ]]; then
+ echo "No git tags in clone, please sync your git tags with upstream using:"
+ echo " git fetch --tags upstream"
+ echo " git push --tags origin"
+ echo ""
+ echo "If the issue persists, the clone depth needs to be increased in .travis.yml"
+ exit 1
+fi
+
+# This will error if there are no tags and we omit --always
+DESCRIPTION=$(git describe --long --tags)
+echo "$DESCRIPTION"
+
+if [[ "$DESCRIPTION" == *"untagged"* ]]; then
+ echo "Unable to determine most recent tag, aborting build"
+ exit 1
+else
+ if [[ "$DESCRIPTION" != *"g"* ]]; then
+# A good description will have the hash prefixed by g, a bad one will be
+# just the hash
+echo "Unable to determine most recent tag, aborting build"
+exit 1
+ else
+echo "$(git tag)"
+ fi
+fi

pandas/tests/test_common.py

@@ -1,4 +1,5 @@
 import collections
+from distutils.version import LooseVersion
 from functools import partial
 import string
 
@@ -117,3 +118,13 @@ def test_git_version():
  git_version = pd.__git_version__
  assert len(git_version) == 40
  assert all(c in string.hexdigits for c in git_version)
+
+
+def test_version_tag():
+ version = pd.__version__
+ try:
+ version > LooseVersion("0.0.1")
+ except TypeError:
+ raise ValueError(
+ "No git tags exist, please sync tags between upstream and your repo"
+ )