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pull: Only fetch pack files if we want more than 66% of their objects 

This avoids some pathologically bad cases where we would fetch a 25MiB
pack file only to extract one 5KiB object from it.
This commit is contained in:
Colin Walters 2012-08-22 19:43:52 -04:00
parent b36b19eaf8
commit 79f993beb4
1 changed files with 36 additions and 3 deletions
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39
src/ostree/ostree-pull.c
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@ -21,6 +21,9 @@
*/
/**
* See:
* https://mail.gnome.org/archives/ostree-list/2012-August/msg00021.html
*
* DESIGN:
*
* Pull refs
@ -64,13 +67,13 @@
#include "ostree-fetcher.h"
gboolean verbose;
gboolean opt_prefer_loose;
gint opt_packfile_threshold = 66;
gboolean opt_related;
gint opt_depth;
static GOptionEntry options[] = {
{ "verbose", 'v', 0, G_OPTION_ARG_NONE, &verbose, "Show more information", NULL },
{ "prefer-loose", 0, 0, G_OPTION_ARG_NONE, &opt_prefer_loose, "Download loose objects by default", NULL },
{ "packfile-threshold", 't', 0, G_OPTION_ARG_INT, &opt_packfile_threshold, "Only download packfiles if more than PERCENT objects are needed (default: 66)", "PERCENT" },
{ "related", 0, 0, G_OPTION_ARG_NONE, &opt_related, "Download related commits", NULL },
{ "depth", 0, 0, G_OPTION_ARG_INT, &opt_depth, "Download parent commits up to this depth (default: 0)", NULL },
{ NULL },
@ -1250,7 +1253,7 @@ fetch_content (OtPullData *pull_data,
cancellable, error))
goto out;
if (remote_pack_checksum && !opt_prefer_loose)
if (remote_pack_checksum)
{
files_to_fetch = g_hash_table_lookup (data_packs_to_fetch, remote_pack_checksum);
if (files_to_fetch == NULL)
@ -1271,6 +1274,36 @@ fetch_content (OtPullData *pull_data,
}
}
g_hash_table_iter_init (&hash_iter, data_packs_to_fetch);
while (g_hash_table_iter_next (&hash_iter, &key, &value))
{
const char *pack_checksum = key;
GPtrArray *files = value;
ot_lvariant GVariant *mapped_pack = NULL;
ot_lvariant GVariant *content_list = NULL;
gboolean fetch;
if (!ostree_repo_map_cached_remote_pack_index (pull_data->repo, pull_data->remote_name,
pack_checksum, FALSE,
&mapped_pack,
cancellable, error))
goto out;
content_list = g_variant_get_child_value (mapped_pack, 2);
fetch = (((double)files->len) / g_variant_n_children (content_list)) > ((double)opt_packfile_threshold / 100);
if (!fetch)
{
guint i;
for (i = 0; i < files->len; i++)
{
g_hash_table_insert (loose_files, files->pdata[i], files->pdata[i]);
files->pdata[i] = NULL; /* steal data */
}
g_hash_table_iter_remove (&hash_iter);
}
}
if (n_objects_to_fetch > 0)
g_print ("%u content objects to fetch\n", n_objects_to_fetch);