From a41c457881b5463b18901a849b4289459ab1d231 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Tom=C3=A1=C5=A1=20Golembiovsk=C3=BD?= Date: Fri, 8 Jul 2016 13:18:09 +0200 Subject: curl: Operate on zero-length file MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Another attempt to fix the bug 1596870. When creating new disk backed by remote file accessed via HTTPS and the backing file has zero length, qemu-img terminates with uniformative error message: qemu-img: disk.qcow2: CURL: Error opening file: While it may not make much sense to operate on empty file, other block backends (e.g. raw backend for regular files) seem to allow it. This patch fixes it for the curl backend and improves the reported error. Signed-off-by: Tomáš Golembiovský Signed-off-by: Michael Tokarev --- block/curl.c | 25 +++++++++++++++++++++---- 1 file changed, 21 insertions(+), 4 deletions(-) (limited to 'block/curl.c') diff --git a/block/curl.c b/block/curl.c index 426fb4d674..571f24cac2 100644 --- a/block/curl.c +++ b/block/curl.c @@ -675,11 +675,28 @@ static int curl_open(BlockDriverState *bs, QDict *options, int flags, curl_easy_setopt(state->curl, CURLOPT_HEADERDATA, s); if (curl_easy_perform(state->curl)) goto out; - curl_easy_getinfo(state->curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &d); - if (d) - s->len = (size_t)d; - else if(!s->len) + if (curl_easy_getinfo(state->curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &d)) { goto out; + } + /* Prior CURL 7.19.4 return value of 0 could mean that the file size is not + * know or the size is zero. From 7.19.4 CURL returns -1 if size is not + * known and zero if it is realy zero-length file. */ +#if LIBCURL_VERSION_NUM >= 0x071304 + if (d < 0) { + pstrcpy(state->errmsg, CURL_ERROR_SIZE, + "Server didn't report file size."); + goto out; + } +#else + if (d <= 0) { + pstrcpy(state->errmsg, CURL_ERROR_SIZE, + "Unknown file size or zero-length file."); + goto out; + } +#endif + + s->len = (size_t)d; + if ((!strncasecmp(s->url, "http://", strlen("http://")) || !strncasecmp(s->url, "https://", strlen("https://"))) && !s->accept_range) { -- cgit v1.2.1