Hi, Calvin Wan, Calvin Wan <calvinwan@xxxxxxxxxx> 于2022年5月3日周二 08:14写道： > > Sometimes it is useful to get information about an object without having > to download it completely. The server logic has already been implemented > as “a2ba162cda (object-info: support for retrieving object info, > 2021-04-20)”. This patch implements the client option for it. > > Add `--object-info` option to `cat-file --batch-command`. This option > allows the client to make an object-info command request to a server > that supports protocol v2. If the server is v2, but does not allow for > the object-info command request, the entire object is fetched and the > relevant object info is returned. > > Summary of changes ================== > > Patches 1, 2, 3, and 7 are small changes that setup the main > implementation. Patch 4 sets up object-info to be backwards compatible > for future patch series that adds additional attributes. Patch 5 adds > internal trasnport functions to send and receive object-info command > request packets. Patch 6 adds the fallback if object-info is not > supported or fails. Patch 8 adds the cat-file implementation. > I have to say I am very curious about this feature. Since the current git partial-clone interface supports only a few filters: blob:limit blob:none sparse:oid tree:0 Though these filters reduce the number of objects downloaded each time, sometimes I just need *only* one blob object, git partial-clone will still download some additional commits and tree objects from the remote. This patch can get the remote-object-info by git cat-file, so can we go further to get the remote-object-content of the object? Something like: $ git cat-file --batch-command remote-object-content origin <oid> > Changes since V3 ================ > > * Object-info is now implemented in cat-file --batch-command rather > than fetch (new base commit) > * Removed config option to advertise object-info > * Added forwards and backwards compability for object-info > * Split up some patches to better describe and visualize changes > > Signed-off-by: Calvin Wan <calvinwan@xxxxxxxxxx> > Helped-by: Jonathan Tan <jonathantanmy@xxxxxxxxxx> > > Calvin Wan (8): > fetch-pack: refactor packet writing > fetch-pack: move fetch default settings > object-store: add function to free object_info contents > object-info: send attribute packet regardless of object ids > transport: add client side capability to request object-info > transport: add object-info fallback to fetch > cat-file: move parse_cmd and DEFAULT_FORMAT up > cat-file: add --batch-command remote-object-info command > > Documentation/git-cat-file.txt | 16 +- > builtin/cat-file.c | 225 ++++++++++++++++----- > fetch-pack.c | 61 ++++-- > fetch-pack.h | 10 + > object-file.c | 16 ++ > object-store.h | 3 + > protocol-caps.c | 14 +- > t/t1006-cat-file.sh | 347 +++++++++++++++++++++++++++++++++ > transport-helper.c | 7 +- > transport.c | 97 ++++++++- > transport.h | 11 ++ > 11 files changed, 728 insertions(+), 79 deletions(-) > > -- > 2.36.0.rc2.10170.gb555eefa6f > Thanks! ZheNing Hu
