Re: [RFC PATCH] Add WEBDAV timeout to http-fetch.
Sean <seanlkml@sympatico.ca> writes:
Show 17 quoted lines
> On Sat, 07 Oct 2006 21:52:02 -0700
> Junio C Hamano <junkio@cox.net> wrote:
>
>> Using DAV, if it works with the server, has the advantage of not
>> having to keep objects/info/packs up-to-date from repository
>> owner's point of view. But the repository owner ends up keeping
>> up-to-date as a side effect of keeping info/refs up-to-date
>> anyway (as I do not see a code to read that information over
>> DAV), so there is no point doing this over DAV in practice.
>>
>> Perhaps we should remove call to remote_ls() from
>> fetch_indices() unconditionally, not just protected with
>> NO_EXPAT and be done with it?
>
> That makes a lot of sense. A server really has to always provide
> a objects/info/packs anyway, just to be fetchable today by clients
> that are compiled with NO_EXPAT.
And even for an isolated group where everybody knows that everybody else runs DAV-enabled clients, they need info/refs prepared for ls-remote and git-fetch script, which means you will run update-server-info to keep objects/info/packs up to date.
Nick, do you see holes in my logic?
-- >8 -- http-fetch.c: drop remote_ls()
While doing remote_ls() over DAV potentially allows the server side not to keep objects/info/pack up-to-date, misconfigured or buggy servers can silently ignore or not to respond to DAV requests and makes the client hang.
The server side (unfortunately) needs to run git-update-server-info even if remote_ls() removes the need to keep objects/info/pack file up-to-date, because the caller of git-http-fetch (git-fetch) and other clients that interact with the repository (e.g. git-ls-remote) need to read from info/refs file (there is no code to make that unnecessary by using DAV yet).
Perhaps the right solution in the longer-term is to make info/refs also unnecessary by using DAV, and we would want to resurrect the code this patch removes when we do so, but let's drop remote_ls() implementation for now. It is causing problems without really helping anything yet.
git will keep it for us until we need it next time.
Signed-off-by: Junio C Hamano <junkio@cox.net>
---
diff --git a/http-fetch.c b/http-fetch.c
index 8f251e7..396552d 100644
--- a/http-fetch.c
+++ b/http-fetch.c
@@ -4,35 +4,6 @@ #include "pack.h"
#include "fetch.h"
#include "http.h"
-#ifndef NO_EXPAT
-#include <expat.h>
-
-/* Definitions for DAV requests */
-#define DAV_PROPFIND "PROPFIND"
-#define DAV_PROPFIND_RESP ".multistatus.response"
-#define DAV_PROPFIND_NAME ".multistatus.response.href"
-#define DAV_PROPFIND_COLLECTION ".multistatus.response.propstat.prop.resourcetype.collection"
-#define PROPFIND_ALL_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:allprop/>\n</D:propfind>"
-
-/* Definitions for processing XML DAV responses */
-#ifndef XML_STATUS_OK
-enum XML_Status {
- XML_STATUS_OK = 1,
- XML_STATUS_ERROR = 0
-};
-#define XML_STATUS_OK 1
-#define XML_STATUS_ERROR 0
-#endif
-
-/* Flags that control remote_ls processing */
-#define PROCESS_FILES (1u << 0)
-#define PROCESS_DIRS (1u << 1)
-#define RECURSIVE (1u << 2)
-
-/* Flags that remote_ls passes to callback functions */
-#define IS_DIR (1u << 0)
-#endif
-
#define PREV_BUF_SIZE 4096
#define RANGE_HEADER_SIZE 30
@@ -90,30 +61,6 @@ struct alternates_request {
int http_specific;
};
-#ifndef NO_EXPAT
-struct xml_ctx
-{
- char *name;
- int len;
- char *cdata;
- void (*userFunc)(struct xml_ctx *ctx, int tag_closed);
- void *userData;
-};
-
-struct remote_ls_ctx
-{
- struct alt_base *repo;
- char *path;
- void (*userFunc)(struct remote_ls_ctx *ls);
- void *userData;
- int flags;
- char *dentry_name;
- int dentry_flags;
- int rc;
- struct remote_ls_ctx *parent;
-};
-#endif
-
static struct object_request *object_queue_head;
static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
@@ -714,193 +661,6 @@ #endif
free(url);
}
-#ifndef NO_EXPAT
-static void
-xml_start_tag(void *userData, const char *name, const char **atts)
-{
- struct xml_ctx *ctx = (struct xml_ctx *)userData;
- const char *c = strchr(name, ':');
- int new_len;
-
- if (c == NULL)
- c = name;
- else
- c++;
-
- new_len = strlen(ctx->name) + strlen(c) + 2;
-
- if (new_len > ctx->len) {
- ctx->name = xrealloc(ctx->name, new_len);
- ctx->len = new_len;
- }
- strcat(ctx->name, ".");
- strcat(ctx->name, c);
-
- free(ctx->cdata);
- ctx->cdata = NULL;
-
- ctx->userFunc(ctx, 0);
-}
-
-static void
-xml_end_tag(void *userData, const char *name)
-{
- struct xml_ctx *ctx = (struct xml_ctx *)userData;
- const char *c = strchr(name, ':');
- char *ep;
-
- ctx->userFunc(ctx, 1);
-
- if (c == NULL)
- c = name;
- else
- c++;
-
- ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
- *ep = 0;
-}
-
-static void
-xml_cdata(void *userData, const XML_Char *s, int len)
-{
- struct xml_ctx *ctx = (struct xml_ctx *)userData;
- free(ctx->cdata);
- ctx->cdata = xmalloc(len + 1);
- strlcpy(ctx->cdata, s, len + 1);
-}
-
-static int remote_ls(struct alt_base *repo, const char *path, int flags,
- void (*userFunc)(struct remote_ls_ctx *ls),
- void *userData);
-
-static void handle_remote_ls_ctx(struct xml_ctx *ctx, int tag_closed)
-{
- struct remote_ls_ctx *ls = (struct remote_ls_ctx *)ctx->userData;
-
- if (tag_closed) {
- if (!strcmp(ctx->name, DAV_PROPFIND_RESP) && ls->dentry_name) {
- if (ls->dentry_flags & IS_DIR) {
- if (ls->flags & PROCESS_DIRS) {
- ls->userFunc(ls);
- }
- if (strcmp(ls->dentry_name, ls->path) &&
- ls->flags & RECURSIVE) {
- ls->rc = remote_ls(ls->repo,
- ls->dentry_name,
- ls->flags,
- ls->userFunc,
- ls->userData);
- }
- } else if (ls->flags & PROCESS_FILES) {
- ls->userFunc(ls);
- }
- } else if (!strcmp(ctx->name, DAV_PROPFIND_NAME) && ctx->cdata) {
- ls->dentry_name = xmalloc(strlen(ctx->cdata) -
- ls->repo->path_len + 1);
- strcpy(ls->dentry_name, ctx->cdata + ls->repo->path_len);
- } else if (!strcmp(ctx->name, DAV_PROPFIND_COLLECTION)) {
- ls->dentry_flags |= IS_DIR;
- }
- } else if (!strcmp(ctx->name, DAV_PROPFIND_RESP)) {
- free(ls->dentry_name);
- ls->dentry_name = NULL;
- ls->dentry_flags = 0;
- }
-}
-
-static int remote_ls(struct alt_base *repo, const char *path, int flags,
- void (*userFunc)(struct remote_ls_ctx *ls),
- void *userData)
-{
- char *url = xmalloc(strlen(repo->base) + strlen(path) + 1);
- struct active_request_slot *slot;
- struct slot_results results;
- struct buffer in_buffer;
- struct buffer out_buffer;
- char *in_data;
- char *out_data;
- XML_Parser parser = XML_ParserCreate(NULL);
- enum XML_Status result;
- struct curl_slist *dav_headers = NULL;
- struct xml_ctx ctx;
- struct remote_ls_ctx ls;
-
- ls.flags = flags;
- ls.repo = repo;
- ls.path = xstrdup(path);
- ls.dentry_name = NULL;
- ls.dentry_flags = 0;
- ls.userData = userData;
- ls.userFunc = userFunc;
- ls.rc = 0;
-
- sprintf(url, "%s%s", repo->base, path);
-
- out_buffer.size = strlen(PROPFIND_ALL_REQUEST);
- out_data = xmalloc(out_buffer.size + 1);
- snprintf(out_data, out_buffer.size + 1, PROPFIND_ALL_REQUEST);
- out_buffer.posn = 0;
- out_buffer.buffer = out_data;
-
- in_buffer.size = 4096;
- in_data = xmalloc(in_buffer.size);
- in_buffer.posn = 0;
- in_buffer.buffer = in_data;
-
- dav_headers = curl_slist_append(dav_headers, "Depth: 1");
- dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
-
- slot = get_active_slot();
- slot->results = &results;
- curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
- curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
- curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
- curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
- curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
- curl_easy_setopt(slot->curl, CURLOPT_URL, url);
- curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
- curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
- curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
-
- if (start_active_slot(slot)) {
- run_active_slot(slot);
- if (results.curl_result == CURLE_OK) {
- ctx.name = xcalloc(10, 1);
- ctx.len = 0;
- ctx.cdata = NULL;
- ctx.userFunc = handle_remote_ls_ctx;
- ctx.userData = &ls;
- XML_SetUserData(parser, &ctx);
- XML_SetElementHandler(parser, xml_start_tag,
- xml_end_tag);
- XML_SetCharacterDataHandler(parser, xml_cdata);
- result = XML_Parse(parser, in_buffer.buffer,
- in_buffer.posn, 1);
- free(ctx.name);
-
- if (result != XML_STATUS_OK) {
- ls.rc = error("XML error: %s",
- XML_ErrorString(
- XML_GetErrorCode(parser)));
- }
- } else {
- ls.rc = -1;
- }
- } else {
- ls.rc = error("Unable to start PROPFIND request");
- }
-
- free(ls.path);
- free(url);
- free(out_data);
- free(in_buffer.buffer);
- curl_slist_free_all(dav_headers);
-
- return ls.rc;
-}
-
-#endif
-
static int fetch_indices(struct alt_base *repo)
{
unsigned char sha1[20];
