Return preinstallimage.info and allow podman to use preinstallimage

Download and return preinstallimage.info if preinstallimage exists to
be able to check the list of packages in preinstallimage without unpacking
it in build environment.
Download preinstallimage and preinstallimage.info in a unique named
temp file first.
Allow podman to use preinstallimage to speed up the build process

osc/build.py

@@ -325,8 +325,9 @@ def get_preinstall_image(apiurl, arch, cache_dir, img_info, offline=False):
     .. note::
         preinstall image can be used only for new build roots!
     """
-    imagefile = ''
-    imagesource = ''
+    imagefile = ""
+    imagesource = ""
+    info_file = "preinstallimage.info"
     img_bins = []
     for bin in img_info.findall('binary'):
         img_bins.append(bin.text)
@@ -339,16 +340,17 @@ def get_preinstall_image(apiurl, arch, cache_dir, img_info, offline=False):
     img_hdrmd5 = img_info.get('hdrmd5')
     if not img_hdrmd5:
         img_hdrmd5 = img_file
-    cache_path = '%s/%s/%s/%s' % (cache_dir, img_project, img_repository, img_arch)
-    ifile_path = '%s/%s' % (cache_path, img_file)
-    ifile_path_part = '%s.part' % ifile_path
+    cache_path = "%s/%s/%s/%s" % (cache_dir, img_project, img_repository, img_arch)
+    ifile_path = "%s/%s" % (cache_path, img_file)
+    info_file_path = "%s/%s" % (cache_path, info_file)
 
     imagefile = ifile_path
     imagesource = "%s/%s/%s [%s]" % (img_project, img_repository, img_pkg, img_hdrmd5)
+    imageinfo = info_file_path
 
     if not os.path.exists(ifile_path):
         if offline:
-            return '', '', []
+            return "", "", "", []
         url = "%s/build/%s/%s/%s/%s/%s" % (apiurl, img_project, img_repository, img_arch, img_pkg, img_file)
         print("downloading preinstall image %s" % imagesource)
         if not os.path.exists(cache_path):
@@ -362,14 +364,34 @@ def get_preinstall_image(apiurl, arch, cache_dir, img_info, offline=False):
         if sys.stdout.isatty():
             progress_obj = create_text_meter(use_pb_fallback=False)
         gr = OscFileGrabber(progress_obj=progress_obj)
-        try:
-            gr.urlgrab(url, filename=ifile_path_part, text='fetching image')
-        except HTTPError as e:
-            print("Failed to download! ecode:%i reason:%s" % (e.code, e.reason))
-            return ('', '', [])
-        # download ok, rename partial file to final file name
-        os.rename(ifile_path_part, ifile_path)
-    return (imagefile, imagesource, img_bins)
+        with NamedTemporaryFile(dir=cache_path, delete=False) as temp_file:
+            try:
+                gr.urlgrab(url, filename=temp_file.name, text="fetching image")
+                # download ok, rename temp file to final file name
+                os.rename(temp_file.name, ifile_path)
+            except HTTPError as e:
+                print("Failed to download! ecode:%i reason:%s" % (e.code, e.reason))
+                # Clean up temp file if it still exists
+                if os.path.exists(temp_file.name):
+                    os.unlink(temp_file.name)
+                return ("", "", "", [])
+
+        # Also download the corresponding .info file
+        if not os.path.exists(info_file_path):
+            info_url = "%s/build/%s/%s/%s/%s/%s" % (apiurl, img_project, img_repository, img_arch, img_pkg, info_file)
+            print("downloading preinstall image info file")
+            with NamedTemporaryFile(dir=cache_path, delete=False) as temp_file:
+                try:
+                    gr.urlgrab(info_url, filename=temp_file.name, text="fetching image info")
+                    # download ok, rename temp file to final file name
+                    os.rename(temp_file.name, info_file_path)
+                except HTTPError as e:
+                    print("Failed to download info file! ecode:%i reason:%s" % (e.code, e.reason))
+                    # Clean up temp file if it still exists
+                    if os.path.exists(temp_file.name):
+                        os.unlink(temp_file.name)
+
+    return (imagefile, imagesource, imageinfo, img_bins)
 
 
 def get_built_files(pacdir, buildtype):
@@ -1188,23 +1210,40 @@ def main(apiurl, store, opts, argv):
         # implicitly trust the project we are building for
         check_trusted_projects(apiurl, [i for i in bi.projects.keys() if not i == prj])
 
-    imagefile = ''
-    imagesource = ''
+    imagefile = ""
+    imagesource = ""
+    imageinfo = ""
     imagebins = []
-    if build_as_user(vm_type):
+    # Check if using container preinstallimage for podman
+    using_container_preinstall = (
+        vm_type == "podman"
+        and opts.build_opt
+        and any("--vm-use-container-preinstallimage" in opt for opt in opts.build_opt)
+    )
+
+    if build_as_user(vm_type) and not using_container_preinstall:
         # preinstallimage extraction will fail because unprivileged user cannot chroot or extract devices from the tarball
         bi.preinstallimage = None
     if build_type == 'preinstallimage':
         # preinstallimage would repackage just the previously built preinstallimage
         bi.preinstallimage = None
 
-    if (not config['no_preinstallimage'] and not opts.nopreinstallimage and
-        bi.preinstallimage and
-        not opts.noinit and
-        (opts.clean or (not os.path.exists(build_root + "/installed-pkg") and
-                        not os.path.exists(build_root + "/.build/init_buildsystem.data")))):
-        (imagefile, imagesource, imagebins) = get_preinstall_image(apiurl, arch, cache_dir, bi.preinstallimage,
-                                                                   opts.offline)
+    if (
+        not config["no_preinstallimage"]
+        and not opts.nopreinstallimage
+        and bi.preinstallimage
+        and not opts.noinit
+        and (
+            opts.clean
+            or (
+                not os.path.exists(build_root + "/installed-pkg")
+                and not os.path.exists(build_root + "/.build/init_buildsystem.data")
+            )
+        )
+    ):
+        (imagefile, imagesource, imageinfo, imagebins) = get_preinstall_image(
+            apiurl, arch, cache_dir, bi.preinstallimage, opts.offline
+        )
         if imagefile:
             # remove binaries from build deps which are included in preinstall image
             for i in bi.deps:
@@ -1495,9 +1534,11 @@ def main(apiurl, store, opts, argv):
     rpmlist += ["%s %s\n" % (i[0], i[1]) for i in rpmlist_prefers]
 
     if imagefile:
-        rpmlist.append('preinstallimage: %s\n' % imagefile)
+        rpmlist.append(f"preinstallimage: {imagefile}\n")
     if imagesource:
-        rpmlist.append('preinstallimagesource: %s\n' % imagesource)
+        rpmlist.append(f"preinstallimagesource: {imagesource}\n")
+    if imageinfo:
+        rpmlist.append(f"preinstallimageinfo: {imageinfo}\n")
 
     rpmlist.append('preinstall: ' + ' '.join(bi.preinstall_list) + '\n')
     rpmlist.append('vminstall: ' + ' '.join(bi.vminstall_list) + '\n')