With rotating kernel dumps the higest dump number is not necessarily the

last one. To make it easier to find the last one create symlinks with 'last'
suffix that will point to the files of the last coredump, eg.:

	info.last -> info.5
	textdump.tar.last.gz -> textdump.tar.5.gz

Reviewed by:	avg
Obtained from:	WHEEL Systems

1 files changed, 29 insertions, 1 deletions

diff --git a/sbin/savecore/savecore.c b/sbin/savecore/savecore.c
index ca1cf1321aad..bdbf7e384f39 100644
--- a/sbin/savecore/savecore.c
+++ b/sbin/savecore/savecore.c
@@ -229,6 +229,17 @@ saved_dump_remove(int bounds)
 	(void)unlink(path);
 }
 
+static void
+symlinks_remove(void)
+{
+
+	(void)unlink("info.last");
+	(void)unlink("vmcore.last");
+	(void)unlink("vmcore.last.gz");
+	(void)unlink("textdump.tar.last");
+	(void)unlink("textdump.tar.last.gz");
+}
+
 /*
  * Check that sufficient space is available on the disk that holds the
  * save directory.
@@ -419,7 +430,7 @@ DoTextdumpFile(int fd, off_t dumpsize, off_t lasthd, char *buf,
 static void
 DoFile(const char *savedir, const char *device)
 {
-	static char infoname[PATH_MAX], corename[PATH_MAX];
+	static char infoname[PATH_MAX], corename[PATH_MAX], linkname[PATH_MAX];
 	static char *buf = NULL;
 	struct kerneldumpheader kdhf, kdhl;
 	off_t mediasize, dumpsize, firsthd, lasthd;
@@ -664,6 +675,23 @@ DoFile(const char *savedir, const char *device)
 		goto closeall;
 	}
 
+	symlinks_remove();
+	if (symlink(infoname, "info.last") == -1) {
+		syslog(LOG_WARNING, "unable to create symlink %s/%s: %m",
+		    savedir, "info.last");
+	}
+	if (compress) {
+		snprintf(linkname, sizeof(linkname), "%s.last.gz",
+		    istextdump ? "textdump.tar" : "vmcore");
+	} else {
+		snprintf(linkname, sizeof(linkname), "%s.last",
+		    istextdump ? "textdump.tar" : "vmcore");
+	}
+	if (symlink(corename, linkname) == -1) {
+		syslog(LOG_WARNING, "unable to create symlink %s/%s: %m",
+		    savedir, linkname);
+	}
+
 	nsaved++;
 
 	if (verbose)