Merge topic 'update_common_latest_version'

80e5f274 Update update-common.sh to the SHA1: b094fcba
Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !1669

vtkm/thirdparty/update-common.sh

@@ -56,7 +56,7 @@ disable_custom_gitattributes() {
     pushd "${extractdir}/${name}-reduced"
     # Git does not allow custom attributes in a subdirectory where we
     # are about to merge the `.gitattributes` file, so disable them.
-    sed -i '/^\[attr\]/ {s/^/#/}' .gitattributes
+    sed -i '/^\[attr\]/ {s/^/#/;}' .gitattributes
     popd
 }
 
@@ -71,8 +71,9 @@ warn () {
 
 readonly regex_date='20[0-9][0-9]-[0-9][0-9]-[0-9][0-9]'
 readonly basehash_regex="$name $regex_date ([0-9a-f]*)"
-readonly basehash="$( git rev-list --author="$ownership" --grep="$basehash_regex" -n 1 HEAD )"
-readonly upstream_old_short="$( git cat-file commit "$basehash" | sed -n '/'"$basehash_regex"'/ {s/.*(//;s/)//;p}' | egrep '^[0-9a-f]+$' )"
+readonly toplevel_dir="$( git rev-parse --show-toplevel )"
+
+cd "$toplevel_dir"
 
 ########################################################################
 # Sanity checking
@@ -87,6 +88,18 @@ readonly upstream_old_short="$( git cat-file commit "$basehash" | sed -n '/'"$ba
     die "'repo' is empty"
 [ -n "$tag" ] || \
     die "'tag' is empty"
+
+# Check for an empty destination directory on disk.  By checking on disk and
+# not in the repo it allows a library to be freshly re-inialized in a single
+# commit rather than first deleting the old copy in one commit and adding the
+# new copy in a seperate commit.
+if [ ! -d "$(git rev-parse --show-toplevel)/$subtree" ]; then
+    readonly basehash=""
+else
+    readonly basehash="$( git rev-list --author="$ownership" --grep="$basehash_regex" -n 1 HEAD )"
+fi
+readonly upstream_old_short="$( git cat-file commit "$basehash" | sed -n '/'"$basehash_regex"'/ {s/.*(//;s/)//;p;}' | egrep '^[0-9a-f]+$' )"
+
 [ -n "$basehash" ] || \
     warn "'basehash' is empty; performing initial import"
 readonly do_shortlog="${shortlog-false}"
@@ -104,6 +117,8 @@ trap "rm -rf '$workdir'" EXIT
 git clone "$repo" "$upstreamdir"
 
 if [ -n "$basehash" ]; then
+    # Remove old worktrees
+    git worktree prune
     # Use the existing package's history
     git worktree add "$extractdir" "$basehash"
     # Clear out the working tree
@@ -163,8 +178,8 @@ popd
 if [ -n "$basehash" ]; then
     git merge --log -s recursive "-Xsubtree=$subtree/" --no-commit "upstream-$name"
 else
-    # Note: on Windows 'git merge' will open a browser, and the check will fail,
-    # so use the flag by default.
+    # Note: on Windows 'git merge --help' will open a browser, and the check
+    # will fail, so use the flag by default.
     unrelated_histories_flag=""
     if git --version | grep -q windows; then
         unrelated_histories_flag="--allow-unrelated-histories "