quoted

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");

The docs say --*-args, but the code checks --*arg, that seems like a
mistake that should be fixed to make the code/tests use the plural form,
no?

Thanks for catching that. Originally it was plural since this single
argument would give multiple arguments to index-pack, but now each
argument gives only a single argument, so "arg" is correct. I'll update
it in the next version.