add option for makebuildsources to specify the style arguments for 'g…

…it describe'. (AMReX-Codes#2957)

Tools/C_scripts/makebuildinfo_C.py

@@ -186,11 +186,11 @@ def runcommand(command):
     out = p.stdout.read()
     return out.strip().decode("ascii")
 
-def get_git_hash(d):
+def get_git_hash(d, git_style):
     cwd = os.getcwd()
     os.chdir(d)
     try:
-        ghash = runcommand("git describe --always --tags --dirty")
+        ghash = runcommand("git describe " + git_style)
     except:
         ghash = ""
     os.chdir(cwd)
@@ -259,6 +259,10 @@ def get_git_hash(d):
                         help="the full path to the build directory that corresponds to build_git_name",
                         type=str, default="")
 
+    parser.add_argument("--GIT_STYLE",
+                        help="style options for the 'git describe' command used to construct hash strings",
+                        type=str, default="--always --tags --dirty")
+
 
     # parse and convert to a dictionary
     args = parser.parse_args()
@@ -281,7 +285,7 @@ def get_git_hash(d):
     git_hashes = []
     for d in GIT:
         if d and os.path.isdir(d):
-            git_hashes.append(get_git_hash(d))
+            git_hashes.append(get_git_hash(d, args.GIT_STYLE))
         else:
             git_hashes.append("")
 
@@ -291,7 +295,7 @@ def get_git_hash(d):
         except:
             build_git_hash = "directory not valid"
         else:
-            build_git_hash = get_git_hash(args.build_git_dir)
+            build_git_hash = get_git_hash(args.build_git_dir, args.GIT_STYLE)
             os.chdir(running_dir)
     else:
         build_git_hash = ""