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[mod_webdav] fix fallback if linkat() fails 

fix fallback if linkat() fails

check at startup if /proc/self/fd is present on systems with O_TMPFILE
(containers might not mount /proc)

x-ref:
  "mod_webdav - PUT files with < 64kb Content-Length reults in zero length file"
  https://redmine.lighttpd.net/boards/2/topics/9273
This commit is contained in:
Glenn Strauss 2020-08-03 22:54:17 -04:00
parent 3470919212
commit 8b4abaf498
1 changed files with 12 additions and 0 deletions
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12
src/mod_webdav.c
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@ -218,6 +218,10 @@
#include "plugin.h"
#if (defined(__linux__) || defined(__CYGWIN__)) && defined(O_TMPFILE)
static int has_proc_self_fd;
#endif
#define http_status_get(r) ((r)->http_status)
#define http_status_set_fin(r, code) ((r)->resp_body_finished = 1,\
(r)->handler_module = NULL, \
@ -538,6 +542,11 @@ SETDEFAULTS_FUNC(mod_webdav_set_defaults) {
mod_webdav_merge_config(&p->defaults, cpv);
}
#if (defined(__linux__) || defined(__CYGWIN__)) && defined(O_TMPFILE)
struct stat st;
has_proc_self_fd = (0 == stat("/proc/self/fd", &st));
#endif
return HANDLER_GO_ON;
}
@ -4222,8 +4231,10 @@ mod_webdav_write_single_file_chunk (request_st * const r, chunkqueue * const cq)
/*assert(cq->first->next != NULL);*/
chunk * const c = cq->first;
cq->first = c->next;
const off_t len = chunkqueue_length(cq);
if (mod_webdav_write_cq(r, cq, c->file.fd)) {
/*assert(cq->first == NULL);*/
c->file.length = len;
c->next = NULL;
cq->first = cq->last = c;
return 1;
@ -4383,6 +4394,7 @@ static int
mod_webdav_put_linkat_rename (request_st * const r,
const char * const pathtemp)
{
if (!has_proc_self_fd) return 0;
chunkqueue * const cq = r->reqbody_queue;
chunk *c = cq->first;