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authorShawn O. Pearce <spearce@spearce.org>2010-04-19 14:23:09 (GMT)
committerJunio C Hamano <gitster@pobox.com>2010-04-20 00:56:20 (GMT)
commitfe72d420ab4dda593dddece7b907ee7868ced127 (patch)
treeb8c4f817c25e1c08d42b2d7df81301849ab28c3e /http.c
parent7b64469a363c10e9e875a73d32a220ba48694a28 (diff)
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http-fetch: Use index-pack rather than verify-pack to check packs
To ensure we don't leave a corrupt pack file positioned as though it were a valid pack file, run index-pack on the temporary pack before we rename it to its final name. If index-pack crashes out when it discovers file corruption (e.g. GitHub's error HTML at the end of the file), simply delete the temporary files to cleanup. By waiting until the pack has been validated before we move it to its final name, we eliminate a race condition where another concurrent reader might try to access the pack at the same time that we are still trying to verify its not corrupt. Switching from verify-pack to index-pack is a change in behavior, but it should turn out better for users. The index-pack algorithm tries to minimize disk seeks, as well as the number of times any given object is inflated, by organizing its work along delta chains. The verify-pack logic does not attempt to do this, thrashing the delta base cache and the filesystem cache. By recreating the index file locally, we also can automatically upgrade from a v1 pack table of contents to v2. This makes the CRC32 data available for use during later repacks, even if the server didn't have them on hand. Signed-off-by: Shawn O. Pearce <spearce@spearce.org> Acked-by: Tay Ray Chuan <rctay89@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'http.c')
-rw-r--r--http.c44
1 files changed, 37 insertions, 7 deletions
diff --git a/http.c b/http.c
index 9c62632..2ebd679 100644
--- a/http.c
+++ b/http.c
@@ -1,6 +1,7 @@
#include "http.h"
#include "pack.h"
#include "sideband.h"
+#include "run-command.h"
int data_received;
int active_requests;
@@ -998,11 +999,14 @@ void release_http_pack_request(struct http_pack_request *preq)
int finish_http_pack_request(struct http_pack_request *preq)
{
- int ret;
struct packed_git **lst;
struct packed_git *p = preq->target;
+ char *tmp_idx;
+ struct child_process ip;
+ const char *ip_argv[8];
+
+ close_pack_index(p);
- p->pack_size = ftell(preq->packfile);
fclose(preq->packfile);
preq->packfile = NULL;
preq->slot->local = NULL;
@@ -1012,13 +1016,39 @@ int finish_http_pack_request(struct http_pack_request *preq)
lst = &((*lst)->next);
*lst = (*lst)->next;
- ret = move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1));
- if (ret)
- return ret;
- if (verify_pack(p))
+ tmp_idx = xstrdup(preq->tmpfile);
+ strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
+ ".idx.temp");
+
+ ip_argv[0] = "index-pack";
+ ip_argv[1] = "-o";
+ ip_argv[2] = tmp_idx;
+ ip_argv[3] = preq->tmpfile;
+ ip_argv[4] = NULL;
+
+ memset(&ip, 0, sizeof(ip));
+ ip.argv = ip_argv;
+ ip.git_cmd = 1;
+ ip.no_stdin = 1;
+ ip.no_stdout = 1;
+
+ if (run_command(&ip)) {
+ unlink(preq->tmpfile);
+ unlink(tmp_idx);
+ free(tmp_idx);
return -1;
- install_packed_git(p);
+ }
+
+ unlink(sha1_pack_index_name(p->sha1));
+ if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
+ || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
+ free(tmp_idx);
+ return -1;
+ }
+
+ install_packed_git(p);
+ free(tmp_idx);
return 0;
}