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authorLibravatar Jonathan Tan <jonathantanmy@google.com>2020-08-17 21:01:36 -0700
committerLibravatar Junio C Hamano <gitster@pobox.com>2020-08-18 16:46:53 -0700
commit7ca3c0ac37bfb803f11db14b7223f6d8f0cd142e (patch)
tree398fb7d6f2379542cfeae4db21a7e75046c3306a /Documentation/technical
parentfetch-pack: do not lazy-fetch during ref iteration (diff)
downloadtgif-7ca3c0ac37bfb803f11db14b7223f6d8f0cd142e.tar.xz
promisor-remote: lazy-fetch objects in subprocess
Teach Git to lazy-fetch missing objects in a subprocess instead of doing it in-process. This allows any fatal errors that occur during the fetch to be isolated and converted into an error return value, instead of causing the current command being run to terminate. Signed-off-by: Jonathan Tan <jonathantanmy@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'Documentation/technical')
-rw-r--r--Documentation/technical/partial-clone.txt13
1 files changed, 3 insertions, 10 deletions
diff --git a/Documentation/technical/partial-clone.txt b/Documentation/technical/partial-clone.txt
index b9e17e7a28..0780d30cac 100644
--- a/Documentation/technical/partial-clone.txt
+++ b/Documentation/technical/partial-clone.txt
@@ -171,20 +171,13 @@ additional flag.
Fetching Missing Objects
------------------------
-- Fetching of objects is done using the existing transport mechanism using
- transport_fetch_refs(), setting a new transport option
- TRANS_OPT_NO_DEPENDENTS to indicate that only the objects themselves are
- desired, not any object that they refer to.
-+
-Because some transports invoke fetch_pack() in the same process, fetch_pack()
-has been updated to not use any object flags when the corresponding argument
-(no_dependents) is set.
+- Fetching of objects is done by invoking a "git fetch" subprocess.
- The local repository sends a request with the hashes of all requested
- objects as "want" lines, and does not perform any packfile negotiation.
+ objects, and does not perform any packfile negotiation.
It then receives a packfile.
-- Because we are reusing the existing fetch-pack mechanism, fetching
+- Because we are reusing the existing fetch mechanism, fetching
currently fetches all objects referred to by the requested objects, even
though they are not necessary.