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lib/download.c: use tempfile while decoding new file from binary diff.

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this prevents corrupted files when filename == basefile.
This commit is contained in:
Enno Boland 2014-08-11 19:05:23 +02:00
parent 040e114ad4
commit f0f8534273
1 changed files with 10 additions and 2 deletions
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12
lib/download.c
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@ -314,7 +314,7 @@ int
xbps_fetch_delta(struct xbps_handle *xhp, const char *basefile, const char *uri, const char *filename, const char *flags)
{
const char xdelta[] = "/usr/bin/xdelta3";
char *basehash = NULL, *dname = NULL, *durl = NULL;
char *basehash = NULL, *dname = NULL, *durl = NULL, *tempfile = NULL;
int status, exitcode;
pid_t pid;
int rv = 0;
@ -329,6 +329,7 @@ xbps_fetch_delta(struct xbps_handle *xhp, const char *basefile, const char *uri,
dname = xbps_xasprintf("%s.%s.vcdiff", basename(uri), basehash);
durl = xbps_xasprintf("%s.%s.vcdiff", uri, basehash);
tempfile = xbps_xasprintf("%s.tmp", filename);
if (xbps_fetch_file_dest(xhp, durl, dname, flags) < 0) {
xbps_dbg_printf(xhp, "error while download vcdiff, fallback to full "
@ -337,7 +338,7 @@ xbps_fetch_delta(struct xbps_handle *xhp, const char *basefile, const char *uri,
}
if ((pid = fork()) == 0) {
execl (xdelta, xdelta, "-d", "-f", "-s", basefile, dname, filename, NULL);
execl(xdelta, xdelta, "-d", "-f", "-s", basefile, dname, tempfile, NULL);
exit(127);
} else if (pid < 0) {
xbps_dbg_printf(xhp, "error while forking, fallback to full "
@ -352,6 +353,11 @@ xbps_fetch_delta(struct xbps_handle *xhp, const char *basefile, const char *uri,
switch(exitcode) {
case 0: // success
rv = 1;
if (rename(tempfile, filename) == -1) {
xbps_dbg_printf(xhp, "failed to rename %s to %s: %s",
tempfile, filename, strerror(errno));
rv = -1;
}
goto fetch_delta_out;
case 127: // cannot execute binary
xbps_dbg_printf(xhp, "failed to `%s`, fallback to full download\n",
@ -366,6 +372,8 @@ xbps_fetch_delta(struct xbps_handle *xhp, const char *basefile, const char *uri,
fetch_delta_fallback:
rv = xbps_fetch_file_dest(xhp, uri, filename, flags);
fetch_delta_out:
if(tempfile != NULL)
free(tempfile);
if(dname != NULL)
free(dname);
if(durl != NULL)