[gimp] build: allow giving several source prefixes to dll_link.py.

[Jehan <jehanp src gnome org>]

commit 31e52f07568c641bc7f23b2980cd252c853e50ea
Author: Jehan <jehan girinstud io>
Date:   Mon Oct 4 16:26:50 2021 +0200

    build: allow giving several source prefixes to dll_link.py.
    
    Also use it to fix packaging of GIMP for the Windows installer (native
    CI job). The CI was indeed failing to package libbrotlienc.dll,
    dependency of libjxl.dll, for the simple reason that they were on
    different prefixes. By calling dll_link.py on one prefix, then the
    other, we were failing to grab the deeper dependency. Now with this new
    ability to set several sources, the script is able to search everywhere
    (with first prefix given on the CLI call as priority).

 build/windows/gitlab-ci/dll_link.py           | 56 +++++++++++++++++----------
 build/windows/gitlab-ci/package-gimp-msys2.sh |  3 +-
 2 files changed, 37 insertions(+), 22 deletions(-)
---
diff --git a/build/windows/gitlab-ci/dll_link.py b/build/windows/gitlab-ci/dll_link.py
index 4c1330ccdc..1280999a44 100755
--- a/build/windows/gitlab-ci/dll_link.py
+++ b/build/windows/gitlab-ci/dll_link.py
@@ -34,9 +34,10 @@ bindir = 'bin'
 # Functions
 
 # Main function
-def main(binary, srcdir, destdir, debug):
-  sys.stdout.write("{} (INFO): searching for dependencies of {} in {}\n".format(os.path.basename(__file__), 
binary, srcdir))
-  find_dependencies(binary, srcdir)
+def main(binary, srcdirs, destdir, debug):
+  sys.stdout.write("{} (INFO): searching for dependencies of {} in {}.\n".format(os.path.basename(__file__),
+                                                                                 binary, ', '.join(srcdirs)))
+  find_dependencies(os.path.abspath(binary), srcdirs)
   if args.debug:
     print("Running in debug mode (no DLL moved)")
     if len(dlls) > 0:
@@ -58,13 +59,23 @@ def main(binary, srcdir, destdir, debug):
       sys.stdout.write("\n\t- ".join(installed_dlls))
       print()
   else:
-    copy_dlls(dlls - sys_dlls, srcdir, destdir)
+    copy_dlls(dlls - sys_dlls, srcdirs, destdir)
 
-def find_dependencies(obj, srcdir):
+def find_dependencies(obj, srcdirs):
   '''
   List DLLs of an object file in a recursive way.
   '''
-  if os.path.exists(obj):
+  if not os.path.isabs(obj):
+    for srcdir in srcdirs:
+      abs_dll = os.path.join(srcdir, bindir, obj)
+      abs_dll = os.path.abspath(abs_dll)
+      if find_dependencies(abs_dll, srcdirs):
+        return True
+    else:
+      # Found in none of the srcdirs: consider it a system DLL
+      sys_dlls.add(os.path.basename(obj))
+      return False
+  elif os.path.exists(obj):
     # If DLL exists, extract dependencies.
     objdump = None
 
@@ -93,31 +104,36 @@ def find_dependencies(obj, srcdir):
       dll = match.group(1)
       if dll not in dlls:
         dlls.add(dll)
-        next_dll = os.path.join(srcdir, bindir, dll)
-        find_dependencies(next_dll, srcdir)
+        find_dependencies(dll, srcdirs)
+
+    return True
   else:
-    # Otherwise, it is a system DLL
-    sys_dlls.add(os.path.basename(obj))
+    return False
 
 # Copy a DLL set into the /destdir/bin directory
-def copy_dlls(dll_list, srcdir, destdir):
+def copy_dlls(dll_list, srcdirs, destdir):
   destbin = os.path.join(destdir, bindir)
   os.makedirs(destbin, exist_ok=True)
   for dll in dll_list:
-    full_file_name = os.path.join(srcdir, bindir, dll)
-    if os.path.isfile(full_file_name):
-      if not os.path.exists(os.path.join(destbin, dll)):
-        sys.stdout.write("{} (INFO): copying {} to {}\n".format(os.path.basename(__file__), full_file_name, 
destbin))
-        shutil.copy(full_file_name, destbin)
-    else:
-      sys.stderr.write("Missing DLL: {}\n".format(full_file_name))
-      sys.exit(os.EX_DATAERR)
+    if not os.path.exists(os.path.join(destbin, dll)):
+      # Do not overwrite existing files.
+      for srcdir in srcdirs:
+        full_file_name = os.path.join(srcdir, bindir, dll)
+        if os.path.isfile(full_file_name):
+          sys.stdout.write("{} (INFO): copying {} to {}\n".format(os.path.basename(__file__), 
full_file_name, destbin))
+          shutil.copy(full_file_name, destbin)
+          break
+      else:
+        # This should not happen. We determined that the dll is in one
+        # of the srcdirs.
+        sys.stderr.write("Missing DLL: {}\n".format(dll))
+        sys.exit(os.EX_DATAERR)
 
 if __name__ == "__main__":
   parser = argparse.ArgumentParser()
   parser.add_argument('--debug', dest='debug', action = 'store_true', default = False)
   parser.add_argument('bin')
-  parser.add_argument('src')
+  parser.add_argument('src', nargs='+')
   parser.add_argument('dest')
   args = parser.parse_args(sys.argv[1:])
 
diff --git a/build/windows/gitlab-ci/package-gimp-msys2.sh b/build/windows/gitlab-ci/package-gimp-msys2.sh
index 5bcf8db90f..b4f8b261d6 100644
--- a/build/windows/gitlab-ci/package-gimp-msys2.sh
+++ b/build/windows/gitlab-ci/package-gimp-msys2.sh
@@ -223,8 +223,7 @@ for dll in ${GIMP_DISTRIB}/lib/gimp/2.99/modules/*.dll; do
   python3 build/windows/gitlab-ci/dll_link.py $dll ${MSYS_PREFIX}/ ${GIMP_DISTRIB};
 done
 for dll in ${GIMP_DISTRIB}/lib/gimp/2.99/plug-ins/*/*.exe; do
-  python3 build/windows/gitlab-ci/dll_link.py $dll ${GIMP_PREFIX}/ ${GIMP_DISTRIB};
-  python3 build/windows/gitlab-ci/dll_link.py $dll ${MSYS_PREFIX}/ ${GIMP_DISTRIB};
+  python3 build/windows/gitlab-ci/dll_link.py $dll ${GIMP_PREFIX}/ ${MSYS_PREFIX}/ ${GIMP_DISTRIB};
 done
 
 # Libraries for GObject Introspection.