libfstools: convert to ulog() api

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>

8 files changed, 73 insertions, 71 deletions

diff --git a/libfstools/extroot.c b/libfstools/extroot.c
index 73ceae8..e548bb1 100644
--- a/libfstools/extroot.c
+++ b/libfstools/extroot.c
@@ -60,6 +60,7 @@ int mount_extroot(void)
 
 	/* set LD_LIBRARY_PATH env var and load kmods from overlay if we found a lib directory there */
 	if (!stat(ldlib_path, &s) && S_ISDIR(s.st_mode)) {
+		ULOG_INFO("loading kmods from internal overlay\n");
 		setenv("LD_LIBRARY_PATH", ldlib_path, 1);
 		snprintf(kmod_loader, sizeof(kmod_loader),
 		         "/sbin/kmodloader %s/etc/modules-boot.d/", dirname(ldlib_path));
@@ -86,10 +87,10 @@ int mount_extroot(void)
 				mkdir("/tmp/extroot/mnt/rom", 0755);
 
 				if (mount_move("/tmp/extroot", "", "/mnt")) {
-					fprintf(stderr, "moving pivotroot failed - continue normal boot\n");
+					ULOG_ERR("moving pivotroot failed - continue normal boot\n");
 					umount("/tmp/extroot/mnt");
 				} else if (pivot("/mnt", "/rom")) {
-					fprintf(stderr, "switching to pivotroot failed - continue normal boot\n");
+					ULOG_ERR("switching to pivotroot failed - continue normal boot\n");
 					umount("/mnt");
 				} else {
 					umount("/tmp/overlay");
@@ -100,10 +101,10 @@ int mount_extroot(void)
 				}
 			} else if (find_mount("/tmp/extroot/overlay")) {
 				if (mount_move("/tmp/extroot", "", "/overlay")) {
-					fprintf(stderr, "moving extroot failed - continue normal boot\n");
+					ULOG_ERR("moving extroot failed - continue normal boot\n");
 					umount("/tmp/extroot/overlay");
 				} else if (fopivot("/overlay", "/rom")) {
-					fprintf(stderr, "switching to extroot failed - continue normal boot\n");
+					ULOG_ERR("switching to extroot failed - continue normal boot\n");
 					umount("/overlay");
 				} else {
 					umount("/tmp/overlay");
diff --git a/libfstools/find.c b/libfstools/find.c
index 4c69d73..0440052 100644
--- a/libfstools/find.c
+++ b/libfstools/find.c
@@ -104,7 +104,7 @@ find_mount_point(char *block, int mtd_only)
 			    strncmp(t, "jffs2", 5) &&
 			    strncmp(t, "ubifs", 5)) {
 				fclose(fp);
-				fprintf(stderr, "block is mounted with wrong fs\n");
+				ULOG_ERR("block is mounted with wrong fs\n");
 				return NULL;
 			}
 			point = p;
@@ -126,7 +126,7 @@ find_filesystem(char *fs)
 	int ret = -1;
 
 	if (!fp) {
-		fprintf(stderr, "opening /proc/filesystems failed: %s\n", strerror(errno));
+		ULOG_ERR("opening /proc/filesystems failed: %s\n", strerror(errno));
 		goto out;
 	}
 
diff --git a/libfstools/libfstools.h b/libfstools/libfstools.h
index b03e432..a9f8576 100644
--- a/libfstools/libfstools.h
+++ b/libfstools/libfstools.h
@@ -16,6 +16,7 @@
 
 #include <libubox/list.h>
 #include <libubox/blob.h>
+#include <libubox/ulog.h>
 
 struct volume;
 
diff --git a/libfstools/mount.c b/libfstools/mount.c
index e095455..81176ce 100644
--- a/libfstools/mount.c
+++ b/libfstools/mount.c
@@ -48,7 +48,7 @@ mount_move(char *oldroot, char *newroot, char *dir)
 	ret = mount(olddir, newdir, NULL, MS_NOATIME | MS_MOVE, NULL);
 
 /*	if (ret)
-		fprintf(stderr, "failed %s %s: %s\n", olddir, newdir, strerror(errno));*/
+		ULOG_ERR("failed %s %s: %s\n", olddir, newdir, strerror(errno));*/
 
 	return ret;
 }
@@ -67,7 +67,7 @@ pivot(char *new, char *old)
 	ret = pivot_root(new, pivotdir);
 
 	if (ret < 0) {
-		fprintf(stderr, "pivot_root failed %s %s: %s\n", new, pivotdir, strerror(errno));
+		ULOG_ERR("pivot_root failed %s %s: %s\n", new, pivotdir, strerror(errno));
 		return -1;
 	}
 
@@ -85,7 +85,7 @@ fopivot(char *rw_root, char *ro_root)
 	char overlay[64], lowerdir[64];
 
 	if (find_filesystem("overlay")) {
-		fprintf(stderr, "BUG: no suitable fs found\n");
+		ULOG_ERR("BUG: no suitable fs found\n");
 		return -1;
 	}
 
@@ -124,8 +124,8 @@ fopivot(char *rw_root, char *ro_root)
 		/* Mainlined overlayfs has been renamed to "overlay", try that first */
 		if (mount(overlay, "/mnt", "overlay", MS_NOATIME, lowerdir)) {
 			if (mount(overlay, "/mnt", "overlayfs", MS_NOATIME, lowerdir)) {
-				fprintf(stderr, "mount failed: %s, options %s\n",
-					strerror(errno), lowerdir);
+				ULOG_ERR("mount failed: %s, options %s\n",
+				         strerror(errno), lowerdir);
 				return -1;
 			}
 		}
diff --git a/libfstools/mtd.c b/libfstools/mtd.c
index b9daabc..d8637aa 100644
--- a/libfstools/mtd.c
+++ b/libfstools/mtd.c
@@ -86,13 +86,13 @@ static int mtd_volume_load(struct volume *v)
 	p->fd = mtd_open(p->chr, 0);
 	if (p->fd < 0) {
 		p->fd = 0;
-		fprintf(stderr, "Could not open mtd device: %s\n", p->chr);
+		ULOG_ERR("Could not open mtd device: %s\n", p->chr);
 		return -1;
 	}
 
 	if (ioctl(p->fd, MEMGETINFO, &mtdInfo)) {
 		mtd_volume_close(v);
-		fprintf(stderr, "Could not get MTD device info from %s\n", p->chr);
+		ULOG_ERR("Could not get MTD device info from %s\n", p->chr);
 		return -1;
 	}
 
@@ -173,7 +173,7 @@ static int mtd_volume_find(struct volume *v, char *name)
 	p->chr = strdup(buffer);
 
 	if (mtd_volume_load(v)) {
-		fprintf(stderr, "reading %s failed\n", v->name);
+		ULOG_ERR("reading %s failed\n", v->name);
 		return -1;
 	}
 
@@ -188,14 +188,14 @@ static int mtd_volume_identify(struct volume *v)
 	size_t sz;
 
 	if (mtd_volume_load(v)) {
-		fprintf(stderr, "reading %s failed\n", v->name);
+		ULOG_ERR("reading %s failed\n", v->name);
 		return -1;
 	}
 
 	sz = read(p->fd, &deadc0de, sizeof(deadc0de));
 
 	if (sz != sizeof(deadc0de)) {
-		fprintf(stderr, "reading %s failed: %s\n", v->name, strerror(errno));
+		ULOG_ERR("reading %s failed: %s\n", v->name, strerror(errno));
 		return -1;
 	}
 
@@ -204,22 +204,22 @@ static int mtd_volume_identify(struct volume *v)
 
 	deadc0de = __be32_to_cpu(deadc0de);
 	if (deadc0de == 0xdeadc0de) {
-		fprintf(stderr, "jffs2 is not ready - marker found\n");
+		ULOG_INFO("jffs2 is not ready - marker found\n");
 		return FS_DEADCODE;
 	}
 
 	jffs2 = __be16_to_cpu(deadc0de >> 16);
 	if (jffs2 == 0x1985) {
-		fprintf(stderr, "jffs2 is ready\n");
+		ULOG_INFO("jffs2 is ready\n");
 		return FS_JFFS2;
 	}
 
 	if (v->type == UBIVOLUME && deadc0de == 0xffffffff) {
-		fprintf(stderr, "jffs2 is ready\n");
+		ULOG_INFO("jffs2 is ready\n");
 		return FS_JFFS2;
 	}
 
-	fprintf(stderr, "No jffs2 marker was found\n");
+	ULOG_INFO("No jffs2 marker was found\n");
 
 	return FS_NONE;
 }
@@ -234,7 +234,7 @@ static int mtd_volume_erase(struct volume *v, int offset, int len)
 		return -1;
 
 	if (offset % v->block_size || len % v->block_size) {
-		fprintf(stderr, "mtd erase needs to be block aligned\n");
+		ULOG_ERR("mtd erase needs to be block aligned\n");
 		return -1;
 	}
 
@@ -245,10 +245,10 @@ static int mtd_volume_erase(struct volume *v, int offset, int len)
 	for (eiu.start = first_block * v->block_size;
 			eiu.start < v->size && eiu.start < (first_block + num_blocks) * v->block_size;
 			eiu.start += v->block_size) {
-		fprintf(stderr, "erasing %x %x\n", eiu.start, v->block_size);
+		ULOG_INFO("erasing %x %x\n", eiu.start, v->block_size);
 		ioctl(p->fd, MEMUNLOCK, &eiu);
 		if (ioctl(p->fd, MEMERASE, &eiu))
-			fprintf(stderr, "Failed to erase block at 0x%x\n", eiu.start);
+			ULOG_ERR("Failed to erase block at 0x%x\n", eiu.start);
 	}
 
 	mtd_volume_close(v);
@@ -275,7 +275,7 @@ static int mtd_volume_init(struct volume *v)
 
 	ret = ioctl(p->fd, MEMGETINFO, &mtdinfo);
 	if (ret) {
-		fprintf(stderr, "ioctl(%d, MEMGETINFO) failed: %s\n", p->fd, strerror(errno));
+		ULOG_ERR("ioctl(%d, MEMGETINFO) failed: %s\n", p->fd, strerror(errno));
 	} else {
 		struct erase_info_user mtdlock;
 
@@ -295,12 +295,12 @@ static int mtd_volume_read(struct volume *v, void *buf, int offset, int length)
 		return -1;
 
 	if (lseek(p->fd, offset, SEEK_SET) == (off_t) -1) {
-		fprintf(stderr, "lseek/read failed\n");
+		ULOG_ERR("lseek/read failed\n");
 		return -1;
 	}
 
 	if (read(p->fd, buf, length) == -1) {
-		fprintf(stderr, "read failed\n");
+		ULOG_ERR("read failed\n");
 		return -1;
 	}
 
@@ -315,13 +315,13 @@ static int mtd_volume_write(struct volume *v, void *buf, int offset, int length)
 		return -1;
 
 	if (lseek(p->fd, offset, SEEK_SET) == (off_t) -1) {
-		fprintf(stderr, "lseek/write failed at offset %d\n", offset);
+		ULOG_ERR("lseek/write failed at offset %d\n", offset);
 		perror("lseek");
 		return -1;
 	}
 
 	if (write(p->fd, buf, length) == -1) {
-		fprintf(stderr, "write failed\n");
+		ULOG_ERR("write failed\n");
 		return -1;
 	}
 
diff --git a/libfstools/overlay.c b/libfstools/overlay.c
index 9e830a1..bb506ee 100644
--- a/libfstools/overlay.c
+++ b/libfstools/overlay.c
@@ -42,7 +42,7 @@ foreachdir(const char *dir, int (*cb)(const char*))
 	if (dir[strlen(dir) - 1] == '/')
 		snprintf(globdir, 256, "%s*", dir);
 	else
-		snprintf(globdir, 256, "%s/*", dir);
+		snprintf(globdir, 256, "%s/*", dir); /**/
 
 	if (!glob(globdir, GLOB_NOESCAPE | GLOB_MARK | GLOB_ONLYDIR, NULL, &gl))
 		for (j = 0; j < gl.gl_pathc; j++)
@@ -55,12 +55,12 @@ static int
 overlay_mount(struct volume *v, char *fs)
 {
 	if (mkdir("/tmp/overlay", 0755)) {
-		fprintf(stderr, "failed to mkdir /tmp/overlay: %s\n", strerror(errno));
+		ULOG_ERR("failed to mkdir /tmp/overlay: %s\n", strerror(errno));
 		return -1;
 	}
 
 	if (mount(v->blk, "/tmp/overlay", fs, MS_NOATIME, NULL)) {
-		fprintf(stderr, "failed to mount -t %s %s /tmp/overlay: %s\n", fs, v->blk, strerror(errno));
+		ULOG_ERR("failed to mount -t %s %s /tmp/overlay: %s\n", fs, v->blk, strerror(errno));
 		return -1;
 	}
 
@@ -74,7 +74,7 @@ switch2jffs(struct volume *v)
 	int ret;
 
 	if (!stat(SWITCH_JFFS2, &s)) {
-		fprintf(stderr, "jffs2 switch already running\n");
+		ULOG_ERR("jffs2 switch already running\n");
 		return -1;
 	}
 
@@ -82,24 +82,24 @@ switch2jffs(struct volume *v)
 	ret = mount(v->blk, "/rom/overlay", "jffs2", MS_NOATIME, NULL);
 	unlink("/tmp/.switch_jffs2");
 	if (ret) {
-		fprintf(stderr, "failed - mount -t jffs2 %s /rom/overlay: %s\n", v->blk, strerror(errno));
+		ULOG_ERR("failed - mount -t jffs2 %s /rom/overlay: %s\n", v->blk, strerror(errno));
 		return -1;
 	}
 
 	if (mount("none", "/", NULL, MS_NOATIME | MS_REMOUNT, 0)) {
-		fprintf(stderr, "failed - mount -o remount,ro none: %s\n", strerror(errno));
+		ULOG_ERR("failed - mount -o remount,ro none: %s\n", strerror(errno));
 		return -1;
 	}
 
-	system("cp -a /tmp/root/* /rom/overlay");
+	system("cp -a /tmp/root/* /rom/overlay"); /**/
 
 	if (pivot("/rom", "/mnt")) {
-		fprintf(stderr, "failed - pivot /rom /mnt: %s\n", strerror(errno));
+		ULOG_ERR("failed - pivot /rom /mnt: %s\n", strerror(errno));
 		return -1;
 	}
 
 	if (mount_move("/mnt", "/tmp/root", "")) {
-		fprintf(stderr, "failed - mount -o move /mnt /tmp/root %s\n", strerror(errno));
+		ULOG_ERR("failed - mount -o move /mnt /tmp/root %s\n", strerror(errno));
 		return -1;
 	}
 
@@ -152,25 +152,25 @@ jffs2_switch(struct volume *v)
 		return -1;
 
 	if (find_filesystem("overlay")) {
-		fprintf(stderr, "overlayfs not found\n");
+		ULOG_ERR("overlayfs not supported by kernel\n");
 		return ret;
 	}
 
 	mp = find_mount_point(v->blk, 0);
 	if (mp) {
-		fprintf(stderr, "rootfs_data:%s is already mounted as %s\n", v->blk, mp);
+		ULOG_ERR("rootfs_data:%s is already mounted as %s\n", v->blk, mp);
 		return -1;
 	}
 
 	switch (volume_identify(v)) {
 	case FS_NONE:
-		fprintf(stderr, "no jffs2 marker found\n");
+		ULOG_ERR("no jffs2 marker found\n");
 		/* fall through */
 
 	case FS_DEADCODE:
 		ret = switch2jffs(v);
 		if (!ret) {
-			fprintf(stderr, "doing fo cleanup\n");
+			ULOG_INFO("performing overlay whiteout\n");
 			umount2("/tmp/root", MNT_DETACH);
 			foreachdir("/overlay/", handle_whiteout);
 		}
@@ -181,7 +181,7 @@ jffs2_switch(struct volume *v)
 		if (ret)
 			break;
 		if (mount_move("/tmp", "", "/overlay") || fopivot("/overlay", "/rom")) {
-			fprintf(stderr, "switching to jffs2 failed\n");
+			ULOG_ERR("switching to jffs2 failed\n");
 			ret = -1;
 		}
 		break;
@@ -191,7 +191,7 @@ jffs2_switch(struct volume *v)
 		if (ret)
 			break;
 		if (mount_move("/tmp", "", "/overlay") || fopivot("/overlay", "/rom")) {
-			fprintf(stderr, "switching to ubifs failed\n");
+			ULOG_ERR("switching to ubifs failed\n");
 			ret = -1;
 		}
 		break;
@@ -204,7 +204,7 @@ static int overlay_mount_fs(struct volume *v)
 	char *fstype;
 
 	if (mkdir("/tmp/overlay", 0755)) {
-		fprintf(stderr, "failed to mkdir /tmp/overlay: %s\n", strerror(errno));
+		ULOG_ERR("failed to mkdir /tmp/overlay: %s\n", strerror(errno));
 		return -1;
 	}
 
@@ -217,8 +217,8 @@ static int overlay_mount_fs(struct volume *v)
 	}
 
 	if (mount(v->blk, "/tmp/overlay", fstype, MS_NOATIME, NULL)) {
-		fprintf(stderr, "failed to mount -t %s %s /tmp/overlay: %s\n",
-				fstype, v->blk, strerror(errno));
+		ULOG_ERR("failed to mount -t %s %s /tmp/overlay: %s\n",
+		         fstype, v->blk, strerror(errno));
 		return -1;
 	}
 
@@ -236,7 +236,7 @@ int mount_overlay(struct volume *v)
 
 	mp = find_mount_point(v->blk, 0);
 	if (mp) {
-		fprintf(stderr, "rootfs_data:%s is already mounted as %s\n", v->blk, mp);
+		ULOG_ERR("rootfs_data:%s is already mounted as %s\n", v->blk, mp);
 		return -1;
 	}
 
@@ -244,13 +244,13 @@ int mount_overlay(struct volume *v)
 
 	extroot_prefix = "/tmp/overlay";
 	if (!mount_extroot()) {
-		fprintf(stderr, "switched to extroot\n");
+		ULOG_INFO("switched to extroot\n");
 		return 0;
 	}
 
-	fprintf(stderr, "switching to overlay\n");
+	ULOG_INFO("switching to overlay\n");
 	if (mount_move("/tmp", "", "/overlay") || fopivot("/overlay", "/rom")) {
-		fprintf(stderr, "switching to jffs2 failed - fallback to ramoverlay\n");
+		ULOG_ERR("switching to jffs2 failed - fallback to ramoverlay\n");
 		return ramoverlay();
 	}
 
diff --git a/libfstools/snapshot.c b/libfstools/snapshot.c
index f2ee0cd..1ec7b87 100644
--- a/libfstools/snapshot.c
+++ b/libfstools/snapshot.c
@@ -40,12 +40,12 @@ verify_file_hash(char *file, uint32_t *hash)
 	uint32_t md5[4];
 
 	if (md5sum(file, md5)) {
-		fprintf(stderr, "failed to generate md5 sum\n");
+		ULOG_ERR("failed to generate md5 sum\n");
 		return -1;
 	}
 
 	if (memcmp(md5, hash, sizeof(md5))) {
-		fprintf(stderr, "failed to verify hash of %s.\n", file);
+		ULOG_ERR("failed to verify hash of %s.\n", file);
 		return -1;
 	}
 
@@ -62,7 +62,7 @@ snapshot_next_free(struct volume *v, uint32_t *seq)
 
 	do {
 		if (volume_read(v, &hdr, block * v->block_size, sizeof(struct file_header))) {
-			fprintf(stderr, "scanning for next free block failed\n");
+			ULOG_ERR("scanning for next free block failed\n");
 			return 0;
 		}
 
@@ -95,7 +95,7 @@ config_find(struct volume *v, struct file_header *conf, struct file_header *sent
 
 	for (i = (v->size / v->block_size) - 1; i > 0; i--) {
 		if (volume_read(v, sentinel,  i * v->block_size, sizeof(*sentinel))) {
-			fprintf(stderr, "failed to read header\n");
+			ULOG_ERR("failed to read header\n");
 			return -1;
 		}
 		be32_to_hdr(sentinel);
@@ -121,12 +121,12 @@ snapshot_write_file(struct volume *v, int block, char *file, uint32_t seq, uint3
 	int ret = -1;
 
 	if (stat(file, &s) || md5sum(file, md5)) {
-		fprintf(stderr, "stat failed on %s\n", file);
+		ULOG_ERR("stat failed on %s\n", file);
 		goto out;
 	}
 
 	if ((block * v->block_size) + pad_file_size(v, s.st_size) > v->size) {
-		fprintf(stderr, "upgrade is too big for the flash\n");
+		ULOG_ERR("upgrade is too big for the flash\n");
 		goto out;
 	}
 	volume_erase(v, block * v->block_size, pad_file_size(v, s.st_size));
@@ -140,13 +140,13 @@ snapshot_write_file(struct volume *v, int block, char *file, uint32_t seq, uint3
 	hdr_to_be32(&hdr);
 
 	if (volume_write(v, &hdr, block * v->block_size, sizeof(struct file_header))) {
-		fprintf(stderr, "failed to write header\n");
+		ULOG_ERR("failed to write header\n");
 		goto out;
 	}
 
 	in = open(file, O_RDONLY);
 	if (in < 1) {
-		fprintf(stderr, "failed to open %s\n", file);
+		ULOG_ERR("failed to open %s\n", file);
 		goto out;
 	}
 
@@ -175,7 +175,7 @@ snapshot_read_file(struct volume *v, int block, char *file, uint32_t type)
 	int out, offset = 0;
 
 	if (volume_read(v, &hdr, block * v->block_size, sizeof(struct file_header))) {
-		fprintf(stderr, "failed to read header\n");
+		ULOG_ERR("failed to read header\n");
 		return -1;
 	}
 	be32_to_hdr(&hdr);
@@ -191,7 +191,7 @@ snapshot_read_file(struct volume *v, int block, char *file, uint32_t type)
 
 	out = open(file, O_WRONLY | O_CREAT, 0700);
 	if (!out) {
-		fprintf(stderr, "failed to open %s\n", file);
+		ULOG_ERR("failed to open %s\n", file);
 		return -1;
 	}
 
@@ -214,7 +214,7 @@ snapshot_read_file(struct volume *v, int block, char *file, uint32_t type)
 	close(out);
 
 	if (verify_file_hash(file, hdr.md5)) {
-		fprintf(stderr, "md5 verification failed\n");
+		ULOG_ERR("md5 verification failed\n");
 		unlink(file);
 		return 0;
 	}
@@ -232,7 +232,7 @@ sentinel_write(struct volume *v, uint32_t _seq)
 	uint32_t seq;
 
 	if (stat("/tmp/config.tar.gz", &s)) {
-		fprintf(stderr, "failed to stat /tmp/config.tar.gz\n");
+		ULOG_ERR("failed to stat /tmp/config.tar.gz\n");
 		return -1;
 	}
 
@@ -246,9 +246,9 @@ sentinel_write(struct volume *v, uint32_t _seq)
 
 	ret = snapshot_write_file(v, block, "/tmp/config.tar.gz", seq, CONF);
 	if (ret)
-		fprintf(stderr, "failed to write sentinel\n");
+		ULOG_ERR("failed to write sentinel\n");
 	else
-		fprintf(stderr, "wrote /tmp/config.tar.gz sentinel\n");
+		ULOG_INFO("wrote /tmp/config.tar.gz sentinel\n");
 	return ret;
 }
 
@@ -266,9 +266,9 @@ volatile_write(struct volume *v, uint32_t _seq)
 
 	ret = snapshot_write_file(v, block, "/tmp/config.tar.gz", seq, CONF);
 	if (ret)
-		fprintf(stderr, "failed to write /tmp/config.tar.gz\n");
+		ULOG_ERR("failed to write /tmp/config.tar.gz\n");
 	else
-		fprintf(stderr, "wrote /tmp/config.tar.gz\n");
+		ULOG_INFO("wrote /tmp/config.tar.gz\n");
 	return ret;
 }
 
@@ -292,7 +292,7 @@ snapshot_sync(struct volume *v)
 	}
 
 	if (!is_config(&conf) && !is_config(&sentinel)) {
-	//	fprintf(stderr, "no config found\n");
+	//	ULOG_ERR("no config found\n");
 	} else if (((is_config(&conf) && is_config(&sentinel)) &&
 				(memcmp(conf.md5, sentinel.md5, sizeof(conf.md5)) || (conf.seq != sentinel.seq))) ||
 			(is_config(&conf) && !is_config(&sentinel))) {
@@ -301,15 +301,15 @@ snapshot_sync(struct volume *v)
 		int ret = snapshot_read_file(v, next, "/tmp/config.tar.gz", CONF);
 		if (ret > 0) {
 			if (sentinel_write(v, conf.seq))
-				fprintf(stderr, "failed to write sentinel data");
+				ULOG_ERR("failed to write sentinel data");
 		}
 	} else if (!is_config(&conf) && is_config(&sentinel) && next) {
 		int ret = snapshot_read_file(v, block, "/tmp/config.tar.gz", CONF);
 		if (ret > 0)
 			if (volatile_write(v, sentinel.seq))
-				fprintf(stderr, "failed to write sentinel data");
+				ULOG_ERR("failed to write sentinel data");
 	} else
-		fprintf(stderr, "config in sync\n");
+		ULOG_INFO("config in sync\n");
 
 	unlink("/tmp/config.tar.gz");
 
diff --git a/libfstools/ubi.c b/libfstools/ubi.c
index 0f6e37a..c5a33df 100644
--- a/libfstools/ubi.c
+++ b/libfstools/ubi.c
@@ -144,7 +144,7 @@ static int ubi_volume_match(struct volume *v, char *name, int ubi_num, int volid
 
 	volname = read_string_from_file(voldir, "name");
 	if (!volname) {
-		fprintf(stderr, "Couldn't read %s/name\n", voldir);
+		ULOG_ERR("Couldn't read %s/name\n", voldir);
 		return -1;
 	}