cgi-io: extend backup file name

[F. D. Ansel]

it is now backup_HOST_rREV-HASH_YYYY-MM-DD_HHMM.tgz
HOST is without domain now, if fqdn was set
the extension changed form tar.gz to tgz
REV+HASH added for easier get of version
TIME added to allow more than 1 backup per day
added list of installed packages

-------------- next part --------------
From 37e9917a3f784b8f0338546129d4a319deaba013 Mon Sep 17 00:00:00 2001
From: Fritz D. Ansel <fdansel at yandex.ru>
Date: Mon, 2 Aug 2021 21:16:16 +0200
Subject: [PATCH] extend backup file name

it is now backup_HOST_rREV-HASH_YYYY-MM-DD_HHMM.tgz
HOST is without domain now, if fqdn was set
the extension changed form tar.gz to tgz
REV+HASH added for easier get of version
TIME added to allow more than 1 backup per day
added list of installed packages

Signed-off-by: Fritz D. Ansel <fdansel at yandex.ru>
---
 main.c | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

diff --git a/main.c b/main.c
index 95a62b8..c0aa15b 100644
--- a/main.c
+++ b/main.c
@@ -650,7 +650,7 @@ main_backup(int argc, char **argv)
 			return failure(500, errno, "Failed chdir('/')");
 
 		execl("/sbin/sysupgrade", "/sbin/sysupgrade",
-		      "--create-backup", "-", NULL);
+		      "-k", "--create-backup", "-", NULL);
 
 		return -1;
 
@@ -658,15 +658,31 @@ main_backup(int argc, char **argv)
 		close(fds[1]);
 
 		now = time(NULL);
-		strftime(datestr, sizeof(datestr) - 1, "%Y-%m-%d", localtime(&now));
+		strftime(datestr, sizeof(datestr) - 1, "%Y-%m-%d_%H%M", localtime(&now));
 
 		if (gethostname(hostname, sizeof(hostname) - 1))
 			sprintf(hostname, "OpenWrt");
+		else {
+			for (int i=0; i<(int)strlen(hostname); i++)
+				if (hostname[i] == '.') {
+					hostname[i] = '\0';
+					break;
+				}
+		}
+
+		char version[32] = "UNKNOWN";
+		FILE *fp;
+		if ((fp = fopen("/etc/openwrt_version", "r")) != NULL) {
+			if (fgets(version, sizeof(version), fp) == version)
+				if (version[strlen(version)-1] == '\n' )
+					version[strlen(version)-1] = '\0';
+			fclose(fp);
+		}
 
 		printf("Status: 200 OK\r\n");
 		printf("Content-Type: application/x-targz\r\n");
 		printf("Content-Disposition: attachment; "
-		       "filename=\"backup-%s-%s.tar.gz\"\r\n\r\n", hostname, datestr);
+		       "filename=\"backup_%s_%s_%s.tgz\"\r\n\r\n", hostname, version, datestr);
 
 		fflush(stdout);
 
-- 
2.31.1