[RFC PATCH v2 21/36] bundle: allow relative URLs in table of contents

["Ævar Arnfjörð Bjarmason" <avarab@gmail.com>]

From: Derrick Stolee <derrickstolee@github.com>

When hosting bundle data, it can be helpful to distribute that data
across multiple CDNs. This might require a change in the base URI, all
the way to the domain name. If all bundles require an absolute URI in
their 'uri' value, then every push to a CDN would require altering the
table of contents to match the expected domain and exact location within
it.

Allow the table of contents to specify a relative URI for the bundles.
This allows easier distribution of bundle data.

RFC-TODO: An earlier change referenced relative URLs, but it was not
implemented until this change.

Signed-off-by: Derrick Stolee <derrickstolee@github.com>
---
 builtin/bundle.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/builtin/bundle.c b/builtin/bundle.c
index 711e0863a16..c55d5215181 100644
--- a/builtin/bundle.c
+++ b/builtin/bundle.c
@@ -10,6 +10,7 @@
 #include "config.h"
 #include "packfile.h"
 #include "list-objects-filter-options.h"
+#include "remote.h"
 
 /*
  * Basic handler for bundle files to connect repositories via sneakernet.
@@ -457,6 +458,8 @@ static int cmd_bundle_fetch(int argc, const char **argv, const char *prefix)
 
 		/* initialize stack using timestamp heuristic. */
 		hashmap_for_each_entry(&toc, &iter, info, ent) {
+			char *old_uri;
+
 			/* Skip if filter does not match. */
 			if (!filter && info->filter_str)
 				continue;
@@ -464,6 +467,10 @@ static int cmd_bundle_fetch(int argc, const char **argv, const char *prefix)
 			    (!info->filter_str || strcasecmp(filter, info->filter_str)))
 				continue;
 
+			old_uri = info->uri;
+			info->uri = relative_url(bundle_uri, info->uri, NULL);
+			free(old_uri);
+
 			/*
 			 * Now that the filter matches, start with the
 			 * bundle with largest timestamp.
-- 
2.36.0.rc2.902.g60576bbc845