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| author |  Derrick Stolee <dstolee@microsoft.com> | 2020-01-21 01:38:12 +0000 |
|---|---|---|
| committer |  Junio C Hamano <gitster@pobox.com> | 2020-01-21 10:24:48 -0800 |
| commit | b40a50264acab504faa2b444dab3603682dc1785 (patch) | |
| tree | ee30a33457cf38740b4190b41be54523bc5a980b /Documentation | |
| parent | msvc: accommodate for vcpkg's upgrade to OpenSSL v1.1.x (diff) | |
| download | tgif-b40a50264acab504faa2b444dab3603682dc1785.tar.xz | |
fetch: document and test --refmap=""
To prevent long blocking time during a 'git fetch' call, a user
may want to set up a schedule for background 'git fetch' processes.
However, these runs will update the refs/remotes branches due to
the default refspec set in the config when Git adds a remote.
Hence the user will not notice when remote refs are updated during
their foreground fetches. In fact, they may _want_ those refs to
stay put so they can work with the refs from their last foreground
fetch call.
This can be accomplished by overriding the configured refspec using
'--refmap=' along with a custom refspec:
git fetch --refmap='' <remote> +refs/heads/*:refs/hidden/<remote>/*
to populate a custom ref space and download a pack of the new
reachable objects. This kind of call allows a few things to happen:
1. We download a new pack if refs have updated.
2. Since the refs/hidden branches exist, GC will not remove the
newly-downloaded data.
3. With fetch.writeCommitGraph enabled, the refs/hidden refs are
used to update the commit-graph file.
To avoid the refs/hidden directory from filling without bound, the
--prune option can be included. When providing a refspec like this,
the --prune option does not delete remote refs and instead only
deletes refs in the target refspace.
Update the documentation to clarify how '--refmap=""' works and
create tests to guarantee this behavior remains in the future.
Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/fetch-options.txt | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/Documentation/fetch-options.txt b/Documentation/fetch-options.txt index 43b9ff3bce..17fe086c7f 100644 --- a/Documentation/fetch-options.txt +++ b/Documentation/fetch-options.txt @@ -135,7 +135,10 @@ ifndef::git-pull[] specified refspec (can be given more than once) to map the refs to remote-tracking branches, instead of the values of `remote.*.fetch` configuration variables for the remote - repository. See section on "Configured Remote-tracking + repository. Providing an empty `<refspec>` to the + `--refmap` option causes Git to ignore the configured + refspecs and rely entirely on the refspecs supplied as + command-line arguments. See section on "Configured Remote-tracking Branches" for details. -t:: |