fix issue for the doeckerfile read and download worker path

lib/worker_multibuild.py

@@ -76,19 +76,19 @@ def _get_dockerfile_contents(jobname, os_codename='bionic'):
     res = ""
     with open(join(path + jobname), "r") as file:
         contents = file.read()
-        # accept any line containing FROM or RUN keywords
-        # re.match(r"(?m)^(FROM|RUN).*$", contents)
-
-        for i in range(len(contents)):
-            if re.match(r"(?m)^(FROM|RUN).*$", contents[i]):
-                res += contents[i]
-                j = i
-                while True:
-                    if "\\" in contents[j]:
-                        res += contents[j+1]
-                        j = j + 1
-                    else:
-                        break
+        # accept any line containing FROM and RUN keywords
+        res = ""
+        inside_allowed_command = False
+        for line in contents:
+            if re.match(r"(?m)^(FROM|RUN).*$", line):
+                inside_allowed_command = True
+            if inside_allowed_command:
+                res += line
+                l = line.strip()
+                if l.endswith("\\") or l.endswith("\\\n"):
+                    continue
+                else:
+                    inside_allowed_command = False
 
     return res + dockerfile_extra_contents[os_codename]
 

multibuild.py

@@ -41,7 +41,7 @@ def add_parent_step(build_factory):
 
     build_factory.addStep(steps.ShellCommand(
         name="download worker",
-        command=["sudo", "wget", "-O", "https://git.bitmessage.org/Bitmessage/buildbot_multibuild/raw/branch/master/lib/worker_multibuild.py", "worker_multibuild.py"]
+        command=["sudo", "wget", "-O", "https://git.bitmessage.org/Bitmessage/buildbot_multibuild/raw/branch/master/lib/worker_multibuild.py", ".local/bin/worker_multibuild.py"]
     ))
 
     # build_factory.addStep(