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parser: Move policy cache functionality into policy_cache.c

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Signed-off-by: John Johansen <john.johansen@canonical.com>
[tyhicks: Fixed build failures]
[tyhicks: Fixed bug where a warning was being printed when it shouldn't]
[tyhicks: Forward ported to trunk]
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
This commit is contained in:
John Johansen
2015-03-25 17:09:26 -05:00
committed by Tyler Hicks
parent 4970d40e0d
commit 2a082ee543
6 changed files with 119 additions and 80 deletions
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81
parser/policy_cache.c
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@@ -145,3 +145,84 @@ error:
return -1;
}
char *cache_filename(const char *cacheloc, const char *basename)
{
char *cachename;
if (asprintf(&cachename, "%s/%s", cacheloc, basename) < 0) {
PERROR(_("Memory allocation error."));
exit(1);
}
return cachename;
}
void valid_read_cache(const char *cachename)
{
struct stat stat_bin;
/* Load a binary cache if it exists and is newest */
if (!skip_read_cache) {
if (stat(cachename, &stat_bin) == 0 &&
stat_bin.st_size > 0) {
if (valid_cached_file_version(cachename))
set_mru_tstamp(stat_bin.st_ctim);
else if (!cond_clear_cache)
write_cache = 0;
} else {
if (!cond_clear_cache)
write_cache = 0;
if (debug_cache)
pwarn("%s: Invalid or missing cache file '%s' (%s)\n", progname, cachename, strerror(errno));
}
}
}
int cache_hit(const char *cachename)
{
if (!mru_skip_cache) {
if (show_cache)
PERROR("Cache hit: %s\n", cachename);
return true;
}
return false;
}
int setup_cache_tmp(const char **cachetmpname, const char *cachename)
{
char *tmpname;
int cache_fd = -1;
*cachetmpname = NULL;
if (write_cache) {
/* Otherwise, set up to save a cached copy */
if (asprintf(&tmpname, "%s-XXXXXX", cachename)<0) {
perror("asprintf");
exit(1);
}
if ((cache_fd = mkstemp(tmpname)) < 0) {
perror("mkstemp");
exit(1);
}
*cachetmpname = tmpname;
}
return cache_fd;
}
void install_cache(const char *cachetmpname, const char *cachename)
{
/* Only install the generate cache file if it parsed correctly
and did not have write/close errors */
if (cachetmpname) {
if (rename(cachetmpname, cachename) < 0) {
pwarn("Warning failed to write cache: %s\n", cachename);
unlink(cachetmpname);
}
else if (show_cache) {
PERROR("Wrote cache: %s\n", cachename);
}
}
}