Add support for partial clone.v1.13.4

A new option, --partial-clone is added to 'repo init' which tells repo
to utilize git's partial clone functionality, which reduces disk and
bandwidth usage when downloading by omitting blob downloads initially.
Different from restricting clone-depth, the user will have full access
to change history, etc., as the objects are downloaded on demand.

Change-Id: I60326744875eac16521a007bd7d5481112a98749
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/229532
Reviewed-by: Mike Frysinger <vapier@google.com>
Tested-by: Xin Li <delphij@google.com>

1 files changed, 13 insertions, 5 deletions

diff --git a/project.py b/project.py
index 67d3bb20..9702e9da 100755
--- a/project.py
+++ b/project.py
@@ -1226,7 +1226,8 @@ class Project(object):
                        archive=False,
                        optimized_fetch=False,
                        prune=False,
-                       submodules=False):
+                       submodules=False,
+                       clone_filter=None):
     """Perform only the network IO portion of the sync process.
        Local working directory/branch state is not affected.
     """
@@ -1309,7 +1310,8 @@ class Project(object):
         not self._RemoteFetch(initial=is_new, quiet=quiet, alt_dir=alt_dir,
                               current_branch_only=current_branch_only,
                               no_tags=no_tags, prune=prune, depth=depth,
-                              submodules=submodules, force_sync=force_sync)):
+                              submodules=submodules, force_sync=force_sync,
+                              clone_filter=clone_filter)):
       return False
 
     mp = self.manifest.manifestProject
@@ -1959,7 +1961,8 @@ class Project(object):
                    prune=False,
                    depth=None,
                    submodules=False,
-                   force_sync=False):
+                   force_sync=False,
+                   clone_filter=None):
 
     is_sha1 = False
     tag_name = None
@@ -2050,6 +2053,11 @@ class Project(object):
 
     cmd = ['fetch']
 
+    if clone_filter:
+      git_require((2, 19, 0), fail=True, msg='partial clones')
+      cmd.append('--filter=%s' % clone_filter)
+      self.config.SetString('extensions.partialclone', self.remote.name)
+
     if depth:
       cmd.append('--depth=%s' % depth)
     else:
@@ -2150,12 +2158,12 @@ class Project(object):
           return self._RemoteFetch(name=name,
                                    current_branch_only=current_branch_only,
                                    initial=False, quiet=quiet, alt_dir=alt_dir,
-                                   depth=None)
+                                   depth=None, clone_filter=clone_filter)
         else:
           # Avoid infinite recursion: sync all branches with depth set to None
           return self._RemoteFetch(name=name, current_branch_only=False,
                                    initial=False, quiet=quiet, alt_dir=alt_dir,
-                                   depth=None)
+                                   depth=None, clone_filter=clone_filter)
 
     return ok