1 files changed, 93 insertions, 0 deletions
diff --git a/dom/media/webrtc/third_party_build/detect_upstream_revert.sh b/dom/media/webrtc/third_party_build/detect_upstream_revert.sh
new file mode 100644
index 0000000000..2dc868952d
--- /dev/null
+++ b/dom/media/webrtc/third_party_build/detect_upstream_revert.sh
@@ -0,0 +1,93 @@
+#!/bin/bash
+
+function show_error_msg()
+{
+  echo "*** ERROR *** $? line $1 $0 did not complete successfully!"
+  echo "$ERROR_HELP"
+}
+ERROR_HELP=""
+
+# Print an Error message if `set -eE` causes the script to exit due to a failed command
+trap 'show_error_msg $LINENO' ERR
+
+source dom/media/webrtc/third_party_build/use_config_env.sh
+
+# If DEBUG_GEN is set all commands should be printed as they are executed
+if [ ! "x$DEBUG_GEN" = "x" ]; then
+  set -x
+fi
+
+if [ "x$MOZ_LIBWEBRTC_SRC" = "x" ]; then
+  echo "MOZ_LIBWEBRTC_SRC is not defined, see README.md"
+  exit
+fi
+
+if [ -d $MOZ_LIBWEBRTC_SRC ]; then
+  echo "MOZ_LIBWEBRTC_SRC is $MOZ_LIBWEBRTC_SRC"
+else
+  echo "Path $MOZ_LIBWEBRTC_SRC is not found, see README.md"
+  exit
+fi
+
+if [ "x$MOZ_LIBWEBRTC_BRANCH" = "x" ]; then
+  echo "MOZ_LIBWEBRTC_BRANCH is not defined, see README.md"
+  exit
+fi
+
+if [ "x$AUTO_FIX_REVERT_AS_NOOP" = "x" ]; then
+  AUTO_FIX_REVERT_AS_NOOP="0"
+fi
+
+find_base_commit
+find_next_commit
+
+MOZ_LIBWEBRTC_COMMIT_MSG=`cd $MOZ_LIBWEBRTC_SRC ; \
+git show --name-only --oneline $MOZ_LIBWEBRTC_NEXT_BASE \
+ | head -1 | sed 's/[^ ]* //'`
+
+echo "MOZ_LIBWEBRTC_BASE: $MOZ_LIBWEBRTC_BASE"
+echo "MOZ_LIBWEBRTC_NEXT_BASE: $MOZ_LIBWEBRTC_NEXT_BASE"
+echo "MOZ_LIBWEBRTC_COMMIT_MSG: $MOZ_LIBWEBRTC_COMMIT_MSG"
+export MOZ_LIBWEBRTC_REVERT_SHA=`cd $MOZ_LIBWEBRTC_SRC ; \
+git log --oneline -r $MOZ_LIBWEBRTC_BASE..$MOZ_TARGET_UPSTREAM_BRANCH_HEAD \
+ | grep -F "Revert \"$MOZ_LIBWEBRTC_COMMIT_MSG" \
+ | tail -1 | awk '{print $1;}' || true`
+
+echo "MOZ_LIBWEBRTC_REVERT_SHA: $MOZ_LIBWEBRTC_REVERT_SHA"
+
+if [ "x$MOZ_LIBWEBRTC_REVERT_SHA" == "x" ]; then
+  echo "no revert commit detected"
+  exit
+fi
+
+if [ "x$AUTO_FIX_REVERT_AS_NOOP" = "x1" ]; then
+  echo "AUTO_FIX_REVERT_AS_NOOP detected, fixing land/revert pair automatically"
+  bash $SCRIPT_DIR/make_upstream_revert_noop.sh
+  exit
+fi
+
+echo $"
+The next upstream commit has a corresponding future \"Revert\" commit.
+
+There are 2 common ways forward in this situation:
+1. If you're relatively certain there will not be rebase conflicts in the
+   github repo ($MOZ_LIBWEBRTC_SRC), simply run:
+       SKIP_NEXT_REVERT_CHK=1 bash $SCRIPT_DIR/loop-ff.sh
+
+2. The surer method for no rebase conflicts is to cherry-pick both the
+   next commit, and the commit that reverts the next commit onto the
+   bottom of our patch stack in github.  This pushes the likely rebase
+   conflict into the future when the upstream fix is relanded, but
+   ensures we only have to deal with the conflict once.  The following
+   commands will add the necessary commits to the bottom of our patch
+   stack in github, and leave indicator files in the home directory that
+   help loop-ff know when to invoke special no-op commit handling:
+
+       MOZ_LIBWEBRTC_BASE=$MOZ_LIBWEBRTC_BASE \\
+       MOZ_LIBWEBRTC_NEXT_BASE=$MOZ_LIBWEBRTC_NEXT_BASE \\
+       MOZ_LIBWEBRTC_REVERT_SHA=$MOZ_LIBWEBRTC_REVERT_SHA \\
+       bash $SCRIPT_DIR/make_upstream_revert_noop.sh
+
+       SKIP_NEXT_REVERT_CHK=1 bash $SCRIPT_DIR/loop-ff.sh
+"
+exit 1