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Add support for sparse checkouts (#1369)

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* Add support for sparse checkouts

* sparse-checkout: optionally turn off cone mode

While it _is_ true that cone mode is the default nowadays (mainly for
performance reasons: code mode is much faster than non-cone mode), there
_are_ legitimate use cases where non-cone mode is really useful.

Let's add a flag to optionally disable cone mode.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

* Verify minimum Git version for sparse checkout

The `git sparse-checkout` command is available only since Git version
v2.25.0. The `actions/checkout` Action actually supports older Git
versions than that; As of time of writing, the minimum version is
v2.18.0.

Instead of raising this minimum version even for users who do not
require a sparse checkout, only check for this minimum version
specifically when a sparse checkout was asked for.

Suggested-by: Tingluo Huang <tingluohuang@github.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

* Support sparse checkout/LFS better

Instead of fetching all the LFS objects present in the current revision
in a sparse checkout, whether they are needed inside the sparse cone or
not, let's instead only pull the ones that are actually needed.

To do that, let's avoid running that preemptive `git lfs fetch` call in
case of a sparse checkout.

An alternative that was considered during the development of this patch
(and ultimately rejected) was to use `git lfs pull --include <path>...`,
but it turned out to be too inflexible because it requires exact paths,
not the patterns that are available via the sparse checkout definition,
and that risks running into command-line length limitations.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

---------

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Co-authored-by: Daniel <daniel.fernandez@feverup.com>
This commit is contained in:
Johannes Schindelin 2023-06-09 15:08:21 +02:00 • committed by GitHub
parent f095bcc56b
commit d106d4669b
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14 changed files with 395 additions and 31 deletions
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action.yml
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@ -53,6 +53,15 @@ inputs:
clean:
description: 'Whether to execute `git clean -ffdx && git reset --hard HEAD` before fetching'
default: true
sparse-checkout:
description: >
Do a sparse checkout on given patterns.
Each pattern should be separated with new lines
default: null
sparse-checkout-cone-mode:
description: >
Specifies whether to use cone-mode when doing a sparse checkout.
default: true
fetch-depth:
description: 'Number of commits to fetch. 0 indicates all history for all branches and tags.'
default: 1