Move all git maintenance scripts to separate directory

scripts/git/pre-push.git-hook

@@ -0,0 +1,82 @@
+#!/bin/bash
+
+# git pre-push hook script to:
+# 1) prevent "fixup!" and "squash!" commit from ending up in master, release-*
+#    or maint-*
+# 2) Disallow pushing branches other than master, release-*
+#    and maint-* to origin (e.g. gitweb.torproject.org).
+#
+# To install this script, copy it into .git/hooks/pre-push path in your
+# local copy of git repository. Make sure it has permission to execute.
+#
+# The following sample script was used as starting point:
+# https://github.com/git/git/blob/master/templates/hooks--pre-push.sample
+
+echo "Running pre-push hook"
+
+z40=0000000000000000000000000000000000000000
+
+remote="$1"
+
+ref_is_upstream_branch() {
+        if [ "$1" == "refs/heads/master" ] ||
+                [[ "$1" == refs/heads/release-* ]] ||
+                [[ "$1" == refs/heads/maint-* ]]
+        then
+                return 1
+        fi
+}
+
+# shellcheck disable=SC2034
+while read -r local_ref local_sha remote_ref remote_sha
+do
+	if [ "$local_sha" = $z40 ]
+	then
+		# Handle delete
+		:
+	else
+		if [ "$remote_sha" = $z40 ]
+		then
+			# New branch, examine all commits
+			range="$local_sha"
+		else
+			# Update to existing branch, examine new commits
+			range="$remote_sha..$local_sha"
+		fi
+
+                if (ref_is_upstream_branch "$local_ref" == 0 ||
+                        ref_is_upstream_branch "$remote_ref"  == 0) &&
+                        [ "$local_ref" != "$remote_ref" ]
+                then
+                        if [ "$remote" == "origin" ]
+                        then
+                                echo >&2 "Not pushing: $local_ref to $remote_ref"
+			        echo >&2 "If you really want to push this, use --no-verify."
+                                exit 1
+                        else
+                                continue
+                        fi
+                fi
+
+                # Check for fixup! commit
+                commit=$(git rev-list -n 1 --grep '^fixup!' "$range")
+		if [ -n "$commit" ]
+		then
+			echo >&2 "Found fixup! commit in $local_ref, not pushing"
+			echo >&2 "If you really want to push this, use --no-verify."
+			exit 1
+		fi
+
+                # Check for squash! commit
+                commit=$(git rev-list -n 1 --grep '^squash!' "$range")
+		if [ -n "$commit" ]
+		then
+			echo >&2 "Found squash! commit in $local_ref, not pushing"
+			echo >&2 "If you really want to push this, use --no-verify."
+			exit 1
+		fi
+	fi
+done
+
+exit 0
+