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clone: add --sparse mode

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When someone wants to clone a large repository, but plans to work
using a sparse-checkout file, they either need to do a full
checkout first and then reduce the patterns they included, or
clone with --no-checkout, set up their patterns, and then run
a checkout manually. This requires knowing a lot about the repo
shape and how sparse-checkout works.

Add a new '--sparse' option to 'git clone' that initializes the
sparse-checkout file to include the following patterns:

	/*
	!/*/

These patterns include every file in the root directory, but
no directories. This allows a repo to include files like a
README or a bootstrapping script to grow enlistments from that
point.

During the 'git sparse-checkout init' call, we must first look
to see if HEAD is valid, since 'git clone' does not have a valid
HEAD at the point where it initializes the sparse-checkout. The
following checkout within the clone command will create the HEAD
ref and update the working directory correctly.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Derrick Stolee
2019-11-21 22:04:35 +00:00
committed by Junio C Hamano
parent bab3c35908
commit d89f09c828
4 changed files with 53 additions and 1 deletions
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6
builtin/sparse-checkout.c
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@ -102,6 +102,7 @@ static int sparse_checkout_init(int argc, const char **argv)
char *sparse_filename;
FILE *fp;
int res;
struct object_id oid;
if (set_config(MODE_ALL_PATTERNS))
return 1;
@ -126,6 +127,11 @@ static int sparse_checkout_init(int argc, const char **argv)
fprintf(fp, "/*\n!/*/\n");
fclose(fp);
if (get_oid("HEAD", &oid)) {
/* assume we are in a fresh repo */
return 0;
}
reset_dir:
return update_working_directory();
}