add -p option, preserving file timestamps

doc/mscp.1.in

@@ -6,7 +6,7 @@ mscp \- copy files over multiple SSH connections
 .SH SYNOPSIS
 
 .B mscp
-.RB [ \-vqDHdNh ]
+.RB [ \-vqDpHdNh ]
 [\c
 .BI \-n \ NR_CONNECTIONS\c
 ]
@@ -35,7 +35,6 @@ mscp \- copy files over multiple SSH connections
 .BI \-l \ LOGIN_NAME\c
 ]
 [\c
-.BR \-p |\c
 .BI \-P \ PORT\c
 ]
 [\c
@@ -217,6 +216,11 @@ none. See
 libssh features
 .UE .
 
+.TP
+.B \-p
+Preserves modification times and access times (file mode bits are
+preserved by default).
+
 .TP
 .B \-H
 Disables hostkey checking.

include/mscp.h

@@ -44,6 +44,7 @@ struct mscp_opts {
 	char	*coremask; /** hex to specifiy usable cpu cores */
 	int	max_startups;	/** sshd MaxStartups concurrent connections */
 	int     interval;	/** interval between SSH connection attempts */
+	bool	preserve_ts;	/** preserve file timestamps */
 
 	int	severity; 	/** messaging severity. set MSCP_SERVERITY_* */
 };

src/fileops.c

@@ -4,10 +4,13 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <dirent.h>
+#include <sys/times.h>
+#include <utime.h>
 
 #include <fileops.h>
 #include <ssh.h>
 #include <message.h>
+#include <platform.h>
 
 
 sftp_session __thread tls_sftp;
@@ -167,6 +170,18 @@ static void sftp_attr_to_stat(sftp_attributes attr, struct stat *st)
 	st->st_gid	= attr->gid;
 	st->st_mode	= attr->permissions;
 
+#if defined(__APPLE__)
+#define st_atim	st_atimespec
+#define st_mtim	st_mtimespec
+#define st_ctim	st_ctimespec
+#endif
+	st->st_atim.tv_sec	= attr->atime;
+	st->st_atim.tv_nsec	= attr->atime_nseconds;
+	st->st_mtim.tv_sec	= attr->mtime;
+	st->st_mtim.tv_nsec	= attr->mtime_nseconds;
+	st->st_ctim.tv_sec	= attr->createtime;
+	st->st_ctim.tv_nsec	= attr->createtime_nseconds;
+
 	switch (attr->type) {
 	case SSH_FILEXFER_TYPE_REGULAR:
 		st->st_mode |= S_IFREG;
@@ -186,8 +201,6 @@ static void sftp_attr_to_stat(sftp_attributes attr, struct stat *st)
 	default:
 		mpr_warn("unkown SSH_FILEXFER_TYPE %d", attr->type);
 	}
-
-	/* ToDo: convert atime, ctime, and mtime */
 }
 
 
@@ -196,6 +209,8 @@ int mscp_stat(const char *path, struct stat *st, sftp_session sftp)
 	sftp_attributes attr;
 	int ret = 0;
 
+	memset(st, 0, sizeof(*st));
+
 	if (sftp) {
 		attr = sftp_stat(sftp, path);
 		sftp_err_to_errno(sftp);
@@ -292,23 +307,34 @@ off_t mscp_lseek(mf *f, off_t off)
 	return ret;
 }
 
-int mscp_setstat(const char *path, mode_t mode, size_t size, sftp_session sftp)
+int mscp_setstat(const char *path, struct stat *st, bool preserve_ts, sftp_session sftp)
 {
 	int ret;
 
 	if (sftp) {
 		struct sftp_attributes_struct attr;
 		memset(&attr, 0, sizeof(attr));
-		attr.permissions = mode;
-		attr.size = size;
+		attr.permissions = st->st_mode;
+		attr.size = st->st_size;
 		attr.flags = (SSH_FILEXFER_ATTR_PERMISSIONS|SSH_FILEXFER_ATTR_SIZE);
+		if (preserve_ts) {
+			attr.atime = st->st_atim.tv_sec;
+			attr.atime_nseconds = st->st_atim.tv_nsec;
+			attr.mtime = st->st_mtim.tv_sec;
+			attr.mtime_nseconds = st->st_mtim.tv_nsec;
+			attr.flags |= (SSH_FILEXFER_ATTR_ACCESSTIME |
+				       SSH_FILEXFER_ATTR_MODIFYTIME |
+				       SSH_FILEXFER_ATTR_SUBSECOND_TIMES);
+		}
 		ret = sftp_setstat(sftp, path, &attr);
 		sftp_err_to_errno(sftp);
 	} else {
-		if ((ret = chmod(path, mode)) < 0)
+		if ((ret = chmod(path, st->st_mode)) < 0)
 			return ret;
-		if ((ret = truncate(path, size)) < 0)
+		if ((ret = truncate(path, st->st_size)) < 0)
 			return ret;
+		if (preserve_ts)
+			ret = setutimes(path, st->st_atim, st->st_mtim);
 	}
 
 	return ret;

src/fileops.h

@@ -50,7 +50,7 @@ off_t mscp_lseek(mf *f, off_t off);
 /* mscp_setstat() involves chmod and truncate. It executes both at
  * once via a single SFTP command (sftp_setstat()).
  */
-int mscp_setstat(const char *path, mode_t mode, size_t size, sftp_session sftp);
+int mscp_setstat(const char *path, struct stat *st, bool preserve_ts, sftp_session sftp);
 
 /* remote glob */
 int mscp_glob(const char *pattern, int flags, glob_t *pglob, sftp_session sftp);

src/main.c

@@ -19,7 +19,7 @@
 void usage(bool print_help) {
 	printf("mscp " MSCP_BUILD_VERSION ": copy files over multiple ssh connections\n"
 	       "\n"
-	       "Usage: mscp [vqDHdNh] [-n nr_conns] [-m coremask]\n"
+	       "Usage: mscp [vqDpHdNh] [-n nr_conns] [-m coremask]\n"
 	       "            [-u max_startups] [-I interval]\n"
 	       "            [-s min_chunk_sz] [-S max_chunk_sz] [-a nr_ahead] [-b buf_sz]\n"
 	       "            [-l login_name] [-p port] [-F ssh_config] [-i identity_file]\n"
@@ -48,7 +48,7 @@ void usage(bool print_help) {
 	       "    -r                 no effect\n"
 	       "\n"
 	       "    -l LOGIN_NAME      login name\n"
-	       "    -p/-P PORT         port number\n"
+	       "    -P PORT            port number\n"
 	       "    -F CONFIG          path to user ssh config (default ~/.ssh/config)\n"
 	       "    -i IDENTITY        identity file for public key authentication\n"
 	       "    -c CIPHER          cipher spec\n"
@@ -56,6 +56,7 @@ void usage(bool print_help) {
 	       "    -C COMPRESS        enable compression: "
 	       "yes, no, zlib, zlib@openssh.com\n"
 	       "    -g CONGESTION      specify TCP congestion control algorithm\n"
+	       "    -p                 preserve timestamps of files\n"
 	       "    -H                 disable hostkey check\n"
 	       "    -d                 increment ssh debug output level\n"
 	       "    -N                 enable Nagle's algorithm (default disabled)\n"
@@ -257,7 +258,7 @@ int main(int argc, char **argv)
 	o.severity = MSCP_SEVERITY_WARN;
 
 	while ((ch = getopt(argc, argv,
-			    "n:m:u:I:s:S:a:b:vqDrl:P:p:i:F:c:M:C:g:HdNh")) != -1) {
+			    "n:m:u:I:s:S:a:b:vqDrl:P:i:F:c:M:C:g:pHdNh")) != -1) {
 		switch (ch) {
 		case 'n':
 			o.nr_threads = atoi(optarg);
@@ -304,8 +305,6 @@ int main(int argc, char **argv)
 			s.login_name = optarg;
 			break;
 		case 'P':
-			/* fallthough for compatibility with scp */
-		case 'p':
 			s.port = optarg;
 			break;
 		case 'F':
@@ -326,6 +325,9 @@ int main(int argc, char **argv)
 		case 'g':
 			s.ccalgo = optarg;
 			break;
+		case 'p':
+			o.preserve_ts = true;
+			break;
 		case 'H':
 			s.no_hostkey_check = true;
 			break;

src/mscp.c

@@ -676,8 +676,9 @@ void *mscp_copy_thread(void *arg)
                 if (!c)
                         break; /* no more chunks */
 
-		if ((t->ret = copy_chunk(c, src_sftp, dst_sftp, m->opts->nr_ahead,
-					 m->opts->buf_sz, &t->done)) < 0)
+		if ((t->ret = copy_chunk(c, src_sftp, dst_sftp,
+					 m->opts->nr_ahead, m->opts->buf_sz,
+					 m->opts->preserve_ts, &t->done)) < 0)
 			break;
         }
 

src/path.c

@@ -556,7 +556,7 @@ static int _copy_chunk(struct chunk *c, mf *s, mf *d,
 }
 
 int copy_chunk(struct chunk *c, sftp_session src_sftp, sftp_session dst_sftp,
-	       int nr_ahead, int buf_sz, size_t *counter)
+	       int nr_ahead, int buf_sz, bool preserve_ts, size_t *counter)
 {
 	mode_t mode;
 	int flags;
@@ -610,10 +610,18 @@ int copy_chunk(struct chunk *c, sftp_session src_sftp, sftp_session dst_sftp,
 		return ret;
 
 	if (refcnt_dec(&c->p->refcnt) == 0) {
+		struct stat st;
 		c->p->state = FILE_STATE_DONE;
-		if (mscp_setstat(c->p->dst_path, c->p->mode, c->p->size, dst_sftp) < 0)
-			mpr_err("failed to chmod and truncate %s: %s",
-				c->p->path, strerrno());
+
+		/* sync stat */
+		if (mscp_stat(c->p->path, &st, src_sftp) < 0) {
+			mpr_err("mscp_stat: %s: %s", c->p->path, strerrno());
+			return -1;
+		}
+		if (mscp_setstat(c->p->dst_path, &st, preserve_ts, dst_sftp) < 0) {
+			mpr_err("mscp_setstat: %s: %s", c->p->path, strerrno());
+			return -1;
+		}
 		mpr_info("copy done: %s", c->p->path);
 	}
 

src/path.h

@@ -98,7 +98,7 @@ void free_path(struct path *p);
 
 /* copy a chunk. either src_sftp or dst_sftp is not null, and another is null */
 int copy_chunk(struct chunk *c, sftp_session src_sftp, sftp_session dst_sftp,
-	       int nr_ahead, int buf_sz, size_t *counter);
+	       int nr_ahead, int buf_sz, bool preserve_ts, size_t *counter);
 
 /* just print contents. just for debugging */
 void path_dump(struct list_head *path_list);

src/platform.c

@@ -2,14 +2,21 @@
 #ifdef __APPLE__
 #include <stdlib.h>
 #include <sys/types.h>
+#include <sys/time.h>
 #include <sys/sysctl.h>
 #elif linux
 #define _GNU_SOURCE
-#include <sched.h>
 #include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <sched.h>
 #elif __FreeBSD__
 #include <stdlib.h>
 #include <unistd.h>
+#include <sys/stat.h>
+#include <fcntl.h>
 #include <pthread_np.h>
 #else
 #error unsupported platform
@@ -40,6 +47,20 @@ int set_thread_affinity(pthread_t tid, int core)
 	return 0;
 }
 
+int setutimes(const char *path, struct timespec atime, struct timespec mtime)
+{
+	struct timeval tv[2]  = {
+		{
+			.tv_sec = atime.tv_sec,
+			.tv_usec = atime.tv_nsec * 1000,
+		},
+		{
+			.tv_sec = mtime.tv_sec,
+			.tv_usec = mtime.tv_nsec * 1000,
+		},
+	};
+	return utimes(path, tv);
+}
 
 static void random_string(char *buf, size_t size)
 {
@@ -108,6 +129,19 @@ int set_thread_affinity(pthread_t tid, int core)
 	return ret;
 }
 
+int setutimes(const char *path, struct timespec atime, struct timespec mtime)
+{
+	struct timespec ts[2] = { atime, mtime };
+	int fd = open(path, O_WRONLY);
+	int ret;
+
+	if (fd < 0)
+		return -1;
+	ret = futimens(fd, ts);
+	close(fd);
+	return ret;
+}
+
 sem_t *sem_create(int value)
 {
 	sem_t *sem;

src/platform.h

@@ -7,6 +7,7 @@
 
 int nr_cpus(void);
 int set_thread_affinity(pthread_t tid, int core);
+int setutimes(const char *path, struct timespec atime, struct timespec mtime);
 
 /*
  * macOS does not support sem_init(). macOS (seems to) releases the