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Fix deterministic builds by sorting input to fts in jevents

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Reported by: emaste@
This commit is contained in:
Matt Macy 2019-02-05 00:31:25 +00:00
parent ccc2d07e77
commit 334fd3dabc
1 changed files with 93 additions and 2 deletions
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95
lib/libpmc/pmu-events/jevents.c
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@ -54,6 +54,10 @@
#include "json.h"
#include "jevents.h"
static int
nftw_ordered(const char *path, int (*fn)(const char *, const struct stat *, int,
struct FTW *), int nfds, int ftwflags);
_Noreturn void _Exit(int);
int verbose;
@ -1122,7 +1126,7 @@ int main(int argc, char *argv[])
maxfds = get_maxfds();
mapfile = NULL;
rc = nftw(ldirname, preprocess_arch_std_files, maxfds, 0);
rc = nftw_ordered(ldirname, preprocess_arch_std_files, maxfds, 0);
if (rc && verbose) {
pr_info("%s: Error preprocessing arch standard files %s: %s\n",
prog, ldirname, strerror(errno));
@ -1135,7 +1139,7 @@ int main(int argc, char *argv[])
goto empty_map;
}
rc = nftw(ldirname, process_one_file, maxfds, 0);
rc = nftw_ordered(ldirname, process_one_file, maxfds, 0);
if (rc && verbose) {
pr_info("%s: Error walking file tree %s\n", prog, ldirname);
goto empty_map;
@ -1169,3 +1173,90 @@ int main(int argc, char *argv[])
free_arch_std_events();
return 0;
}
#include <fts.h>
static int
fts_compare(const FTSENT * const *a, const FTSENT * const *b)
{
return (strcmp((*a)->fts_name, (*b)->fts_name));
}
static int
nftw_ordered(const char *path, int (*fn)(const char *, const struct stat *, int,
struct FTW *), int nfds, int ftwflags)
{
char * const paths[2] = { (char *)path, NULL };
struct FTW ftw;
FTSENT *cur;
FTS *ftsp;
int error = 0, ftsflags, fnflag, postorder, sverrno;
/* XXX - nfds is currently unused */
if (nfds < 1) {
errno = EINVAL;
return (-1);
}
ftsflags = FTS_COMFOLLOW;
if (!(ftwflags & FTW_CHDIR))
ftsflags |= FTS_NOCHDIR;
if (ftwflags & FTW_MOUNT)
ftsflags |= FTS_XDEV;
if (ftwflags & FTW_PHYS)
ftsflags |= FTS_PHYSICAL;
else
ftsflags |= FTS_LOGICAL;
postorder = (ftwflags & FTW_DEPTH) != 0;
ftsp = fts_open(paths, ftsflags, fts_compare);
if (ftsp == NULL)
return (-1);
while ((cur = fts_read(ftsp)) != NULL) {
switch (cur->fts_info) {
case FTS_D:
if (postorder)
continue;
fnflag = FTW_D;
break;
case FTS_DC:
continue;
case FTS_DNR:
fnflag = FTW_DNR;
break;
case FTS_DP:
if (!postorder)
continue;
fnflag = FTW_DP;
break;
case FTS_F:
case FTS_DEFAULT:
fnflag = FTW_F;
break;
case FTS_NS:
case FTS_NSOK:
fnflag = FTW_NS;
break;
case FTS_SL:
fnflag = FTW_SL;
break;
case FTS_SLNONE:
fnflag = FTW_SLN;
break;
default:
error = -1;
goto done;
}
ftw.base = cur->fts_pathlen - cur->fts_namelen;
ftw.level = cur->fts_level;
error = fn(cur->fts_path, cur->fts_statp, fnflag, &ftw);
if (error != 0)
break;
}
done:
sverrno = errno;
if (fts_close(ftsp) != 0 && error == 0)
error = -1;
else
errno = sverrno;
return (error);
}