Merge branch 'nd/shallow-clone'

Fetching from a shallow-cloned repository used to be forbidden,
primarily because the codepaths involved were not carefully vetted
and we did not bother supporting such usage. This attempts to allow
object transfer out of a shallow-cloned repository in a controlled
way (i.e. the receiver become a shallow repository with truncated
history).

* nd/shallow-clone: (31 commits)
  t5537: fix incorrect expectation in test case 10
  shallow: remove unused code
  send-pack.c: mark a file-local function static
  git-clone.txt: remove shallow clone limitations
  prune: clean .git/shallow after pruning objects
  clone: use git protocol for cloning shallow repo locally
  send-pack: support pushing from a shallow clone via http
  receive-pack: support pushing to a shallow clone via http
  smart-http: support shallow fetch/clone
  remote-curl: pass ref SHA-1 to fetch-pack as well
  send-pack: support pushing to a shallow clone
  receive-pack: allow pushes that update .git/shallow
  connected.c: add new variant that runs with --shallow-file
  add GIT_SHALLOW_FILE to propagate --shallow-file to subprocesses
  receive/send-pack: support pushing from a shallow clone
  receive-pack: reorder some code in unpack()
  fetch: add --update-shallow to accept refs that update .git/shallow
  upload-pack: make sure deepening preserves shallow roots
  fetch: support fetching from a shallow repository
  clone: support remote shallow repository
  ...

1 files changed, 18 insertions, 13 deletions

diff --git a/fetch-pack.h b/fetch-pack.h
index 20ccc12e57..bb7fd76e59 100644
--- a/fetch-pack.h
+++ b/fetch-pack.h
@@ -4,23 +4,27 @@
 #include "string-list.h"
 #include "run-command.h"
 
+struct sha1_array;
+
 struct fetch_pack_args {
 	const char *uploadpack;
 	int unpacklimit;
 	int depth;
-	unsigned quiet:1,
-		keep_pack:1,
-		lock_pack:1,
-		use_thin_pack:1,
-		fetch_all:1,
-		stdin_refs:1,
-		diag_url:1,
-		verbose:1,
-		no_progress:1,
-		include_tag:1,
-		stateless_rpc:1,
-		check_self_contained_and_connected:1,
-		self_contained_and_connected:1;
+	unsigned quiet:1;
+	unsigned keep_pack:1;
+	unsigned lock_pack:1;
+	unsigned use_thin_pack:1;
+	unsigned fetch_all:1;
+	unsigned stdin_refs:1;
+	unsigned diag_url:1;
+	unsigned verbose:1;
+	unsigned no_progress:1;
+	unsigned include_tag:1;
+	unsigned stateless_rpc:1;
+	unsigned check_self_contained_and_connected:1;
+	unsigned self_contained_and_connected:1;
+	unsigned cloning:1;
+	unsigned update_shallow:1;
 };
 
 /*
@@ -34,6 +38,7 @@ struct ref *fetch_pack(struct fetch_pack_args *args,
 		       const char *dest,
 		       struct ref **sought,
 		       int nr_sought,
+		       struct sha1_array *shallow,
 		       char **pack_lockfile);
 
 #endif