Add memcr version info

git describe output should be good enough.

Makefile

@@ -104,6 +104,8 @@ endif
 
 PCFLAGS += -Wstrict-prototypes -fno-stack-protector -fpie -nostdlib -ffreestanding -fomit-frame-pointer -Wa,--noexecstack
 
+GIT_VERSION = $(shell git describe --dirty 2>/dev/null | sed 's/^v//' || echo "unknown")
+
 GOFF = ./gen-offsets.sh
 
 B ?= .
@@ -141,7 +143,7 @@ $(B)/cpu.o: arch/$(ARCH)/cpu.c
 	$(CC) $(MCFLAGS) -c $^ -o $@
 
 $(B)/memcr.o: memcr.c $(B)/parasite-blob.h
-	$(CC) $(MCFLAGS) -I$(B) -c $< -o $@
+	$(CC) $(MCFLAGS) -DGIT_VERSION='"$(GIT_VERSION)"' -I$(B) -c $< -o $@
 
 $(B)/memcr: $(B)/memcr.o $(B)/cpu.o $(B)/enter.o
 	$(CC) $(MCFLAGS) $^ $(LDFLAGS) -o $@
@@ -150,7 +152,7 @@ $(B)/memcr: $(B)/memcr.o $(B)/cpu.o $(B)/enter.o
 
 
 $(B)/memcr-client.o: memcr-client.c
-	$(CC) $(CFLAGS) -I$(B) -c $< -o $@
+	$(CC) $(CFLAGS) -DGIT_VERSION='"$(GIT_VERSION)"' -I$(B) -c $< -o $@
 
 $(B)/memcr-client: $(B)/memcr-client.o
 	$(CC) $(CFLAGS) $^ -o $@

memcr-client.c

@@ -91,17 +91,23 @@ static int send_cmd(int cd, struct service_command cmd)
 	return resp.resp_code;
 }
 
+static void print_version(void)
+{
+	fprintf(stdout, "[i] memcr-client version %s\n", GIT_VERSION);
+}
+
 static void usage(const char *name, int status)
 {
 	fprintf(status ? stderr : stdout,
-		"%s -l PORT|PATH -p PID [-c -r]\n" \
+		"%s -l PORT|PATH -p PID [-c -r] [-V]\n" \
 		"options: \n" \
 		"  -h --help\t\thelp\n" \
 		"  -l --location\t\tTCP port number of localhost memcr service\n" \
 		"\t\t\t or filesystem path to memcr service UNIX socket\n" \
 		"  -p --pid\t\tprocess ID to be checkpointed / restored\n" \
 		"  -c --checkpoint\tsend checkpoint command to memcr service\n" \
-		"  -r --restore\t\tsend restore command to memcr service\n",
+		"  -r --restore\t\tsend restore command to memcr service\n" \
+		"  -V --version\t\tprint version and exit\n",
 		name);
 	exit(status);
 }
@@ -123,10 +129,11 @@ int main(int argc, char *argv[])
 		{ "pid",        1,  0,  'p'},
 		{ "checkpoint", 0,  0,  'c'},
 		{ "restore",    0,  0,  'r'},
+		{ "version",    0,  0,  'V'},
 		{ NULL,         0,  0,  0  }
 	};
 
-	while ((opt = getopt_long(argc, argv, "hl:p:cr", long_options, &option_index)) != -1) {
+	while ((opt = getopt_long(argc, argv, "hl:p:crV", long_options, &option_index)) != -1) {
 		switch (opt) {
 			case 'h':
 				usage(argv[0], 0);
@@ -143,6 +150,9 @@ int main(int argc, char *argv[])
 			case 'r':
 				restore = 1;
 				break;
+			case 'V':
+				print_version();
+				exit(0);
 			default: /* '?' */
 				usage(argv[0], 1);
 				break;

memcr.c

@@ -2833,10 +2833,15 @@ static int user_interactive_mode(pid_t pid)
 	return ret;
 }
 
+static void print_version(void)
+{
+	fprintf(stdout, "[i] memcr version %s\n", GIT_VERSION);
+}
+
 static void usage(const char *name, int status)
 {
 	fprintf(status ? stderr : stdout,
-		"%s [-h] [-p PID] [-d DIR] [-S DIR] [-l PORT|PATH] [-n] [-m] [-f] [-z] [-c] [-e]\n" \
+		"%s [-h] [-p PID] [-d DIR] [-S DIR] [-l PORT|PATH] [-n] [-m] [-f] [-z] [-c] [-e] [-V]\n" \
 		"options:\n" \
 		"  -h --help		help\n" \
 		"  -p --pid		target processs pid\n" \
@@ -2854,7 +2859,8 @@ static void usage(const char *name, int status)
 		"  -z --compress		compress memory dump\n" \
 		"  -c --checksum		enable md5 checksum for memory dump\n" \
 		"  -e --encrypt		enable encryption of memory dump\n" \
-		"  -t --timeout		timeout in seconds for checkpoint/restore execution in service mode\n",
+		"  -t --timeout		timeout in seconds for checkpoint/restore execution in service mode\n" \
+		"  -v --version		print version and exit\n",
 		name);
 
 	exit(status);
@@ -2895,14 +2901,15 @@ int main(int argc, char *argv[])
 		{ "checksum",			0,	NULL,	'c'},
 		{ "encrypt",			2,	0,	'e'},
 		{ "timeout",			1,	0,	't'},
+		{ "version",			0,	0,	'V'},
 		{ NULL,				0,	NULL,	0  }
 	};
 
 	dump_dir = "/tmp";
 	parasite_socket_dir = NULL;
 	parasite_socket_use_netns = 0;
 
-	while ((opt = getopt_long(argc, argv, "hp:d:S:Nl:nmfzce::t:", long_options, &option_index)) != -1) {
+	while ((opt = getopt_long(argc, argv, "hp:d:S:Nl:nmfzce::t:V", long_options, &option_index)) != -1) {
 		switch (opt) {
 			case 'h':
 				usage(argv[0], 0);
@@ -2954,6 +2961,9 @@ int main(int argc, char *argv[])
 			case 't':
 				timeout = atoi(optarg);
 				break;
+			case 'V':
+				print_version();
+				exit(0);
 			default: /* '?' */
 				usage(argv[0], 1);
 		}
@@ -2965,6 +2975,8 @@ int main(int argc, char *argv[])
 	if (pid <= 0 && !listen_location)
 		die("pid must be > 0\n");
 
+	print_version();
+
 	ret = access("/proc/self/pagemap", F_OK);
 	if (ret)
 		die("/proc/self/pagemap not present (depends on CONFIG_PROC_PAGE_MONITOR)\n");

memcr.h

@@ -22,6 +22,10 @@
 #include <stdint.h>
 #include <assert.h>
 
+#ifndef GIT_VERSION
+#define GIT_VERSION "unknown"
+#endif
+
 #ifndef PAGE_SIZE
 #define PAGE_SIZE 4096
 #endif