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fetch: allow adding a filter after initial clone

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Retroactively adding a filter can be useful for existing shallow clones as
they allow users to see earlier change histories without downloading all
git objects in a regular --unshallow fetch.

Without this patch, users can make a clone partial by editing the
repository configuration to convert the remote into a promisor, like:

  git config core.repositoryFormatVersion 1
  git config extensions.partialClone origin
  git fetch --unshallow --filter=blob:none origin

Since the hard part of making this work is already in place and such
edits can be error-prone, teach Git to perform the required configuration
change automatically instead.

Note that this change does not modify the existing git behavior which
recognizes setting extensions.partialClone without changing
repositoryFormatVersion.

Signed-off-by: Xin Li <delphij@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Xin Li
2020-06-05 02:10:02 -07:00
committed by Junio C Hamano
parent 16af5f1abb
commit 01bbbbd9da
5 changed files with 12 additions and 6 deletions
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3
builtin/fetch.c
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@ -1790,9 +1790,6 @@ int cmd_fetch(int argc, const char **argv, const char *prefix)
if (depth || deepen_since || deepen_not.nr)
deepen = 1;
if (filter_options.choice && !has_promisor_remote())
die("--filter can only be used when extensions.partialClone is set");
if (all) {
if (argc == 1)
die(_("fetch --all does not take a repository argument"));