createiso: Update possibly changed file on DVD

There's no good way of detecting if buildinstall phase tweaked boot
configuration (and efiboot.img). We should update those files in the DVD
just to be sure.

The .discinfo file is always different and needs to be updated.

Relates: https://pagure.io/pungi/issue/1647
JIRA: RHELCMP-10811
Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>
(cherry picked from commit e1d7544c2b)

pungi/createiso.py

@@ -11,6 +11,8 @@ from six.moves import shlex_quote
 from .wrappers import iso
 from .wrappers.jigdo import JigdoWrapper
 
+from .phases.buildinstall import BOOT_CONFIGS, BOOT_IMAGES
+
 
 CreateIsoOpts = namedtuple(
     "CreateIsoOpts",
@@ -120,6 +122,7 @@ def make_jigdo(f, opts):
 
 
 def write_xorriso_commands(opts):
+    # Create manifest for the boot.iso listing all contents
     boot_iso_manifest = "%s.manifest" % os.path.join(
         opts.script_dir, os.path.basename(opts.boot_iso)
     )
@@ -128,8 +131,20 @@ def write_xorriso_commands(opts):
             opts.boot_iso, opts.use_xorrisofs, output_file=boot_iso_manifest
         )
     )
+    # Find which files may have been updated by pungi. This only includes a few
+    # files from tweaking buildinstall and .discinfo metadata. There's no good
+    # way to detect whether the boot config files actually changed, so we may
+    # be updating files in the ISO with the same data.
+    UPDATEABLE_FILES = set(BOOT_IMAGES + BOOT_CONFIGS + [".discinfo"])
+    updated_files = set()
+    excluded_files = set()
     with open(boot_iso_manifest) as f:
-        exclude = set(line.lstrip("/").rstrip("\n") for line in f)
+        for line in f:
+            path = line.lstrip("/").rstrip("\n")
+            if path in UPDATEABLE_FILES:
+                updated_files.add(path)
+            else:
+                excluded_files.add(path)
 
     script = os.path.join(opts.script_dir, "xorriso-%s.txt" % id(opts))
     with open(script, "w") as f:
@@ -143,9 +158,10 @@ def write_xorriso_commands(opts):
         with open(opts.graft_points) as gp:
             for line in gp:
                 iso_path, fs_path = line.strip().split("=", 1)
-                if iso_path in exclude:
+                if iso_path in excluded_files:
                     continue
-                emit(f, "-map %s %s" % (fs_path, iso_path))
+                cmd = "-update" if iso_path in updated_files else "-map"
+                emit(f, "%s %s %s" % (cmd, fs_path, iso_path))
 
         if opts.arch == "ppc64le":
             # This is needed for the image to be bootable.

pungi/phases/buildinstall.py

@@ -364,6 +364,9 @@ BOOT_CONFIGS = [
     "EFI/BOOT/BOOTX64.conf",
     "EFI/BOOT/grub.cfg",
 ]
+BOOT_IMAGES = [
+    "images/efiboot.img",
+]
 
 
 def tweak_configs(path, volid, ks_file, configs=BOOT_CONFIGS, logger=None):
@@ -443,9 +446,7 @@ def tweak_buildinstall(
     if kickstart_file and found_configs:
         shutil.copy2(kickstart_file, os.path.join(dst, "ks.cfg"))
 
-    images = [
-        os.path.join(tmp_dir, "images", "efiboot.img"),
-    ]
+    images = [os.path.join(tmp_dir, img) for img in BOOT_IMAGES]
     if found_configs:
         for image in images:
             if not os.path.isfile(image):