[PATCH v4 5/7] packfile-uri.txt: support for excluding commits and trees

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Signed-off-by: Teng Long <dyroneteng@xxxxxxxxx>
---
 Documentation/technical/packfile-uri.txt | 32 ++++++++++++++++--------
 1 file changed, 21 insertions(+), 11 deletions(-)

diff --git a/Documentation/technical/packfile-uri.txt b/Documentation/technical/packfile-uri.txt
index f7eabc6c76..c3e4873956 100644
--- a/Documentation/technical/packfile-uri.txt
+++ b/Documentation/technical/packfile-uri.txt
@@ -35,13 +35,26 @@ include some sort of non-trivial implementation in the Minimum Viable Product,
 at least so that we can test the client.
 
 This is the implementation: a feature, marked experimental, that allows the
-server to be configured by one or more `uploadpack.blobPackfileUri=<sha1>
-<uri>` entries. Whenever the list of objects to be sent is assembled, all such
-blobs are excluded, replaced with URIs. As noted in "Future work" below, the
-server can evolve in the future to support excluding other objects (or other
-implementations of servers could be made that support excluding other objects)
-without needing a protocol change, so clients should not expect that packfiles
-downloaded in this way only contain single blobs.
+server to be configured by one or more entries with the format:
+
+    uploadpack.excludeobject=<object-hash> <pack-hash> <uri>
+
+Value <object-hash> is the key of entry, and the object type can be a blob,
+tree, or commit. The exclusion of tree and commit is recursive by default,
+which means that when a tree or commit object is excluded, the object itself
+and all reachable objects of the object will be excluded recursively. Whenever
+the list of objects to be sent is assembled, all such objects are excluded,
+replaced with URIs.
+
+Configuration compatibility
+-------------
+
+The old configuration of packfile-uri:
+
+	`uploadpack.blobPackfileUri=<object-hash> <pack-hash> <uri>`
+
+For the old configuration is compatible with the new one, but it only
+supports the exclusion of blob objects.
 
 Client design
 -------------
@@ -65,9 +78,6 @@ The protocol design allows some evolution of the server and client without any
 need for protocol changes, so only a small-scoped design is included here to
 form the MVP. For example, the following can be done:
 
- * On the server, more sophisticated means of excluding objects (e.g. by
-   specifying a commit to represent that commit and all objects that it
-   references).
  * On the client, resumption of clone. If a clone is interrupted, information
    could be recorded in the repository's config and a "clone-resume" command
    can resume the clone in progress. (Resumption of subsequent fetches is more
@@ -78,4 +88,4 @@ There are some possible features that will require a change in protocol:
 
  * Additional HTTP headers (e.g. authentication)
  * Byte range support
- * Different file formats referenced by URIs (e.g. raw object)
+ * Different file formats referenced by URIs (e.g. raw object)
\ No newline at end of file
-- 
2.31.1.449.gb2aa5456a8.dirty




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