[PATCH v2 2/4] http-fetch: allow custom index-pack args

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This is the next step in teaching fetch-pack to pass its index-pack
arguments when processing packfiles referenced by URIs.

The "--keep" in fetch-pack.c will be replaced with a full message in a
subsequent commit.

Signed-off-by: Jonathan Tan <jonathantanmy@xxxxxxxxxx>
Signed-off-by: Junio C Hamano <gitster@xxxxxxxxx>
---
 Documentation/git-http-fetch.txt | 10 ++++++++--
 fetch-pack.c                     |  3 +++
 http-fetch.c                     | 20 +++++++++++++++-----
 t/t5550-http-fetch-dumb.sh       |  5 ++++-
 4 files changed, 30 insertions(+), 8 deletions(-)

diff --git a/Documentation/git-http-fetch.txt b/Documentation/git-http-fetch.txt
index 4deb4893f5..9fa17b60e4 100644
--- a/Documentation/git-http-fetch.txt
+++ b/Documentation/git-http-fetch.txt
@@ -41,11 +41,17 @@ commit-id::
 		<commit-id>['\t'<filename-as-in--w>]
 
 --packfile=<hash>::
-	Instead of a commit id on the command line (which is not expected in
+	For internal use only. Instead of a commit id on the command
+	line (which is not expected in
 	this case), 'git http-fetch' fetches the packfile directly at the given
 	URL and uses index-pack to generate corresponding .idx and .keep files.
 	The hash is used to determine the name of the temporary file and is
-	arbitrary. The output of index-pack is printed to stdout.
+	arbitrary. The output of index-pack is printed to stdout. Requires
+	--index-pack-args.
+
+--index-pack-args=<args>::
+	For internal use only. The command to run on the contents of the
+	downloaded pack. Arguments are URL-encoded separated by spaces.
 
 --recover::
 	Verify that everything reachable from target is fetched.  Used after
diff --git a/fetch-pack.c b/fetch-pack.c
index 876f90c759..aeac010b0b 100644
--- a/fetch-pack.c
+++ b/fetch-pack.c
@@ -1645,6 +1645,9 @@ static struct ref *do_fetch_pack_v2(struct fetch_pack_args *args,
 		strvec_pushf(&cmd.args, "--packfile=%.*s",
 			     (int) the_hash_algo->hexsz,
 			     packfile_uris.items[i].string);
+		strvec_push(&cmd.args, "--index-pack-arg=index-pack");
+		strvec_push(&cmd.args, "--index-pack-arg=--stdin");
+		strvec_push(&cmd.args, "--index-pack-arg=--keep");
 		strvec_push(&cmd.args, uri);
 		cmd.git_cmd = 1;
 		cmd.no_stdin = 1;
diff --git a/http-fetch.c b/http-fetch.c
index 2d1d9d054f..fa642462a9 100644
--- a/http-fetch.c
+++ b/http-fetch.c
@@ -3,6 +3,7 @@
 #include "exec-cmd.h"
 #include "http.h"
 #include "walker.h"
+#include "strvec.h"
 
 static const char http_fetch_usage[] = "git http-fetch "
 "[-c] [-t] [-a] [-v] [--recover] [-w ref] [--stdin | --packfile=hash | commit-id] url";
@@ -43,11 +44,9 @@ static int fetch_using_walker(const char *raw_url, int get_verbosely,
 	return rc;
 }
 
-static const char *index_pack_args[] =
-	{"index-pack", "--stdin", "--keep", NULL};
-
 static void fetch_single_packfile(struct object_id *packfile_hash,
-				  const char *url) {
+				  const char *url,
+				  const char **index_pack_args) {
 	struct http_pack_request *preq;
 	struct slot_results results;
 	int ret;
@@ -90,6 +89,7 @@ int cmd_main(int argc, const char **argv)
 	int packfile = 0;
 	int nongit;
 	struct object_id packfile_hash;
+	struct strvec index_pack_args = STRVEC_INIT;
 
 	setup_git_directory_gently(&nongit);
 
@@ -116,6 +116,8 @@ int cmd_main(int argc, const char **argv)
 			packfile = 1;
 			if (parse_oid_hex(p, &packfile_hash, &end) || *end)
 				die(_("argument to --packfile must be a valid hash (got '%s')"), p);
+		} else if (skip_prefix(argv[arg], "--index-pack-arg=", &p)) {
+			strvec_push(&index_pack_args, p);
 		}
 		arg++;
 	}
@@ -128,10 +130,18 @@ int cmd_main(int argc, const char **argv)
 	git_config(git_default_config, NULL);
 
 	if (packfile) {
-		fetch_single_packfile(&packfile_hash, argv[arg]);
+		if (!index_pack_args.nr)
+			die(_("--packfile requires --index-pack-args"));
+
+		fetch_single_packfile(&packfile_hash, argv[arg],
+				      index_pack_args.v);
+
 		return 0;
 	}
 
+	if (index_pack_args.nr)
+		die(_("--index-pack-args can only be used with --packfile"));
+
 	if (commits_on_stdin) {
 		commits = walker_targets_stdin(&commit_id, &write_ref);
 	} else {
diff --git a/t/t5550-http-fetch-dumb.sh b/t/t5550-http-fetch-dumb.sh
index 483578b2d7..358b322e05 100755
--- a/t/t5550-http-fetch-dumb.sh
+++ b/t/t5550-http-fetch-dumb.sh
@@ -224,7 +224,10 @@ test_expect_success 'http-fetch --packfile' '
 
 	git init packfileclient &&
 	p=$(cd "$HTTPD_DOCUMENT_ROOT_PATH"/repo_pack.git && ls objects/pack/pack-*.pack) &&
-	git -C packfileclient http-fetch --packfile=$ARBITRARY "$HTTPD_URL"/dumb/repo_pack.git/$p >out &&
+	git -C packfileclient http-fetch --packfile=$ARBITRARY \
+		--index-pack-arg=index-pack --index-pack-arg=--stdin \
+		--index-pack-arg=--keep \
+		"$HTTPD_URL"/dumb/repo_pack.git/$p >out &&
 
 	grep "^keep.[0-9a-f]\{16,\}$" out &&
 	cut -c6- out >packhash &&
-- 
2.30.0.617.g56c4b15f3c-goog




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