grubby/SOURCES/0045-Be-more-thorough-about-flushing-our-config-file-when.patch

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2019-05-07 11:56:13 +00:00
From 7d48cb09b85b81f707565db6d35b1ba0d247b6b4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fran=C3=A7ois=20Cami?= <fcami@fedoraproject.org>
Date: Fri, 23 Jun 2017 23:56:50 +0200
Subject: [PATCH 45/55] Be more thorough about flushing our config file when
writing.
Add missing fclose() at the end of writeConfig
Use fflush(out) + fsync(fileno(out) on temporary file
fsync() the destination directory after rename
---
grubby.c | 41 ++++++++++++++++++++++++++++++++++-------
1 file changed, 34 insertions(+), 7 deletions(-)
diff --git a/grubby.c b/grubby.c
index 5202485a541..11ee64a02b9 100644
--- a/grubby.c
+++ b/grubby.c
@@ -1789,6 +1789,7 @@ static int writeConfig(struct grubConfig *cfg, char *outName,
int needs = MAIN_DEFAULT;
struct stat sb;
int i;
+ int rc = 0;
if (!strcmp(outName, "-")) {
out = stdout;
@@ -1903,16 +1904,42 @@ static int writeConfig(struct grubConfig *cfg, char *outName,
}
if (tmpOutName) {
- if (rename(tmpOutName, outName)) {
+ /* write userspace buffers */
+ if (fflush(out))
+ rc = 1;
+
+ /* purge the write-back cache with fsync() */
+ if (fsync(fileno(out)))
+ rc = 1;
+
+ if (fclose(out))
+ rc = 1;
+
+ if (rc == 0 && rename(tmpOutName, outName)) {
+ unlink(tmpOutName);
+ rc = 1;
+ }
+
+ /* fsync() the destination directory after rename */
+ if (rc == 0) {
+ int dirfd;
+
+ dirfd = open(dirname(strdupa(outName)), O_RDONLY);
+ if (dirfd < 0)
+ rc = 1;
+ else if (fsync(dirfd))
+ rc = 1;
+
+ if (dirfd >= 0)
+ close(dirfd);
+ }
+
+ if (rc == 1)
fprintf(stderr,
- _("grubby: error moving %s to %s: %s\n"),
- tmpOutName, outName, strerror(errno));
- unlink(outName);
- return 1;
- }
+ _("grubby: error flushing data: %m\n"));
}
- return 0;
+ return rc;
}
static int numEntries(struct grubConfig *cfg)
--
2.17.1