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Followup to #66: Gzip log files >= .2

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This patch to the logrotate() function extends the log rotattion of a
file with a gzip of .2 and older log files.  If gzip is not available
in $PATH then @num files are left uncompressed.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
This commit is contained in:
Joachim Nilsson
2017-02-10 11:00:17 +01:00
parent 9f7604848c
commit 5ea1ac7582
1 changed files with 31 additions and 5 deletions
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src/utmp-api.c
+31 -5
View File
@@ -36,7 +36,7 @@
#define _PATH_BTMP "/var/log/btmp"
#endif
#define MAX_NO 2
#define MAX_NO 5
#define MAX_SZ 100 * 1024
static void utmp_strncpy(char *dst, const char *src, size_t dlen)
@@ -51,8 +51,15 @@ static void utmp_strncpy(char *dst, const char *src, size_t dlen)
}
#ifdef LOGROTATE_ENABLED
/*
* This function triggers a log rotates of @file when size >= @sz bytes
* At most @num old versions are kept and by default it starts gzipping
* .2 and older log files. If gzip is not available in $PATH then @num
* files are kept uncompressed.
*/
static int logrotate(char *file, int num, off_t sz)
{
int cnt;
struct stat st;
if (stat(file, &st))
@@ -60,18 +67,37 @@ static int logrotate(char *file, int num, off_t sz)
if (sz > 0 && S_ISREG(st.st_mode) && st.st_size > sz) {
if (num > 0) {
size_t len = strlen(file) + 3 + 1;
size_t len = strlen(file) + 10 + 1;
char ofile[len];
char nfile[len];
while (num) {
snprintf(ofile, len, "%s.%d", file, num - 1);
snprintf(nfile, len, "%s.%d", file, num--);
/* First age zipped log files */
for (cnt = num; cnt > 2; cnt--) {
snprintf(ofile, len, "%s.%d.gz", file, cnt - 1);
snprintf(nfile, len, "%s.%d.gz", file, cnt);
/* May fail because ofile doesn't exist yet, ignore. */
(void)rename(ofile, nfile);
}
for (cnt = num; cnt > 0; cnt--) {
snprintf(ofile, len, "%s.%d", file, cnt - 1);
snprintf(nfile, len, "%s.%d", file, cnt);
/* May fail because ofile doesn't exist yet, ignore. */
(void)rename(ofile, nfile);
if (cnt == 2 && fexist(nfile)) {
size_t len = 5 + strlen(nfile) + 1;
char cmd[len];
snprintf(cmd, len, "gzip %s", nfile);
run(cmd);
remove(nfile);
}
}
rename(file, nfile);
create(file, st.st_mode, st.st_uid, st.st_gid);
} else {