[PATCH 04/24] bundle-uri: add support for http(s):// and file://

["Derrick Stolee via GitGitGadget" <gitgitgadget@gmail.com>]

From: Derrick Stolee <derrickstolee@github.com>

The previous change created the logic for copying a file by name. Now,
first inspect the URI for an HTTP(S) prefix and use git-remote-https as
the way to download the data at that URI. Otherwise, check to see if
file:// is present and modify the prefix accordingly.

Signed-off-by: Derrick Stolee <derrickstolee@github.com>
---
 bundle-uri.c | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 64 insertions(+), 1 deletion(-)

diff --git a/bundle-uri.c b/bundle-uri.c
index 91aba061833..08de7257c74 100644
--- a/bundle-uri.c
+++ b/bundle-uri.c
@@ -19,10 +19,73 @@ static void find_temp_filename(struct strbuf *name)
 	unlink(name->buf);
 }
 
+static int download_https_uri_to_file(const char *uri, const char *file)
+{
+	int result = 0;
+	struct child_process cp = CHILD_PROCESS_INIT;
+	FILE *child_in = NULL, *child_out = NULL;
+	struct strbuf line = STRBUF_INIT;
+	int found_get = 0;
+
+	strvec_pushl(&cp.args, "git-remote-https", "origin", uri, NULL);
+	cp.in = -1;
+	cp.out = -1;
+
+	if (start_command(&cp))
+		return 1;
+
+	child_in = fdopen(cp.in, "w");
+	if (!child_in) {
+		result = 1;
+		goto cleanup;
+	}
+
+	child_out = fdopen(cp.out, "r");
+	if (!child_out) {
+		result = 1;
+		goto cleanup;
+	}
+
+	fprintf(child_in, "capabilities\n");
+	fflush(child_in);
+
+	while (!strbuf_getline(&line, child_out)) {
+		if (!line.len)
+			break;
+		if (!strcmp(line.buf, "get"))
+			found_get = 1;
+	}
+	strbuf_release(&line);
+
+	if (!found_get) {
+		result = error(_("insufficient capabilities"));
+		goto cleanup;
+	}
+
+	fprintf(child_in, "get %s %s\n\n", uri, file);
+
+cleanup:
+	if (child_in)
+		fclose(child_in);
+	if (finish_command(&cp))
+		return 1;
+	if (child_out)
+		fclose(child_out);
+	return result;
+}
+
 static int copy_uri_to_file(const char *uri, const char *file)
 {
+	const char *out;
+	if (skip_prefix(uri, "https:", &out) ||
+	    skip_prefix(uri, "http:", &out))
+		return download_https_uri_to_file(uri, file);
+
+	if (!skip_prefix(uri, "file://", &out))
+		out = uri;
+
 	/* Copy as a file */
-	return copy_file(uri, file, 0444);
+	return !!copy_file(out, file, 0);
 }
 
 static int unbundle_from_file(struct repository *r, const char *file)
-- 
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