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promisor-remote: lazy-fetch objects in subprocess

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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>
This commit is contained in:
Jonathan Tan
2020-08-17 21:01:36 -07:00
committed by Junio C Hamano
parent 5c3b801dab
commit 7ca3c0ac37
6 changed files with 31 additions and 42 deletions
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13
Documentation/technical/partial-clone.txt
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@ -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.