X-Git-Url: https://mattmccutchen.net/rsync/rsync.git/blobdiff_plain/67684d038de4c18431af0ccc17f55efbf4f20eb8..fc1ae6582fa5e199cc9c50dc2297297c1893955c:/generator.c

diff --git a/generator.c b/generator.c
index 7a939aff..740ce668 100644
--- a/generator.c
+++ b/generator.c
@@ -1,21 +1,21 @@
 /* -*- c-file-style: "linux" -*-
 
    rsync -- fast file replication program
-   
-   Copyright (C) 1996-2000 by Andrew Tridgell 
+
+   Copyright (C) 1996-2000 by Andrew Tridgell
    Copyright (C) Paul Mackerras 1996
    Copyright (C) 2002 by Martin Pool <mbp@samba.org>
-   
+
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.
-   
+
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
-   
+
    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
@@ -41,6 +41,7 @@ extern int remote_version;
 extern int always_checksum;
 extern int modify_window;
 extern char *compare_dest;
+extern int link_dest;
 
 
 /* choose whether to skip a particular file */
@@ -50,8 +51,23 @@ static int skip_file(char *fname,
 	if (st->st_size != file->length) {
 		return 0;
 	}
-	
-	/* if always checksum is set then we use the checksum instead 
+	if (link_dest) {
+		extern int preserve_perms;
+		extern int preserve_uid;
+		extern int preserve_gid;
+
+		if(preserve_perms
+		    && (st->st_mode & ~_S_IFMT) !=  (file->mode & ~_S_IFMT))
+			return 0;
+
+		if (preserve_uid && st->st_uid != file->uid)
+			return 0;
+
+		if (preserve_gid && st->st_gid != file->gid)
+			return 0;
+	}
+
+	/* if always checksum is set then we use the checksum instead
 	   of the file time to determine whether to sync */
 	if (always_checksum && S_ISREG(st->st_mode)) {
 		char sum[MD4_SUM_LENGTH];
@@ -60,7 +76,7 @@ static int skip_file(char *fname,
 		if (compare_dest != NULL) {
 			if (access(fname, 0) != 0) {
 				snprintf(fnamecmpdest,MAXPATHLEN,"%s/%s",
-						    compare_dest,fname);
+					 compare_dest,fname);
 				fname = fnamecmpdest;
 			}
 		}
@@ -100,33 +116,25 @@ static int adapt_block_size(struct file_struct *file, int bsize)
 
 
 /*
-  send a sums struct down a fd
+ * 	NULL sum_struct means we have no checksums
   */
-static void send_sums(struct sum_struct *s, int f_out)
+
+void write_sum_head(int f, struct sum_struct *sum)
 {
-	if (s) {
-		size_t i;
-
-		/* tell the other guy how many we are going to be
-		   doing and how many bytes there are in the last
-		   chunk */
-		write_int(f_out, s->count);
-		write_int(f_out, s->n);
-		write_int(f_out, s->remainder);
-
-		for (i = 0; i < s->count; i++) {
-			write_int(f_out, s->sums[i].sum1);
-			write_buf(f_out, s->sums[i].sum2, csum_length);
-		}
-	} else {
-		/* we don't have checksums */
-		write_int(f_out, 0);
-		write_int(f_out, block_size);
-		write_int(f_out, 0);
-	}
+	static struct sum_struct null_sum;
+
+	if (sum == (struct sum_struct *)NULL)
+		sum = &null_sum;
+
+	write_int(f, sum->count);
+	write_int(f, sum->blength);
+	if (remote_version >= 27)
+		write_int(f, sum->s2length);
+	write_int(f, sum->remainder);
 }
 
 
+
 /**
  * Perhaps we want to just send an empty checksum set for this file,
  * which will force the whole thing to be literally transferred.
@@ -138,90 +146,63 @@ static void send_sums(struct sum_struct *s, int f_out)
  * Whew. */
 static BOOL disable_deltas_p(void)
 {
-	extern int whole_file, no_whole_file;
+	extern int whole_file;
 	extern int local_server;
 	extern int write_batch;
 
-	assert(whole_file == 0 || whole_file == 1);
-
-	/* whole_file and no_whole_file are never both on at the same time */
-
-	if (whole_file)
+	if (whole_file > 0)
 		return True;
-	else if (no_whole_file)
+	if (whole_file == 0 || write_batch)
 		return False;
-	else if (write_batch)
-		return False;
-	else
-		return local_server;
+	return local_server;
 }
 
 
-/**
- * Generate a stream of signatures/checksums that describe a buffer.
- *
- * Generate approximately one checksum every @p n bytes.
+/*
+ * Generate and send a stream of signatures/checksums that describe a buffer
  *
- * @return Newly-allocated sum_struct
- **/
-static struct sum_struct *generate_sums(struct map_struct *buf, OFF_T len,
-					int n)
+ * Generate approximately one checksum every block_len bytes.
+ */
+static void generate_and_send_sums(struct map_struct *buf, OFF_T len,
+				   int block_len, int f_out)
 {
-	int i;
-	struct sum_struct *s;
-	int count;
-	int block_len = n;
-	int remainder = (len % block_len);
+	size_t i;
+	struct sum_struct sum;
 	OFF_T offset = 0;
 
-	count = (len + (block_len - 1)) / block_len;
+	sum.count = (len + (block_len - 1)) / block_len;
+	sum.remainder = (len % block_len);
+	sum.blength	= block_len;
+	sum.flength = len;
+	sum.s2length	= csum_length;
+	/* not needed here  sum.sums = NULL; */
 
-	s = (struct sum_struct *) malloc(sizeof(*s));
-	if (!s)
-		out_of_memory("generate_sums");
-
-	s->count = count;
-	s->remainder = remainder;
-	s->n = n;
-	s->flength = len;
-
-	if (count == 0) {
-		s->sums = NULL;
-		return s;
-	}
-
-	if (verbose > 3) {
+	if (sum.count && verbose > 3) {
 		rprintf(FINFO, "count=%ld rem=%ld n=%ld flength=%.0f\n",
-			(long) s->count, (long) s->remainder,
-			(long) s->n, (double) s->flength);
+			(long) sum.count, (long) sum.remainder,
+			(long) sum.blength, (double) sum.flength);
 	}
 
-	s->sums = (struct sum_buf *) malloc(sizeof(s->sums[0]) * s->count);
-	if (!s->sums)
-		out_of_memory("generate_sums");
+	write_sum_head(f_out, &sum);
 
-	for (i = 0; i < count; i++) {
-		int n1 = MIN(len, n);
+	for (i = 0; i < sum.count; i++) {
+		int n1 = MIN(len, block_len);
 		char *map = map_ptr(buf, offset, n1);
+		uint32 sum1 = get_checksum1(map, n1);
+		char sum2[SUM_LENGTH];
 
-		s->sums[i].sum1 = get_checksum1(map, n1);
-		get_checksum2(map, n1, s->sums[i].sum2);
-
-		s->sums[i].offset = offset;
-		s->sums[i].len = n1;
-		s->sums[i].i = i;
+		get_checksum2(map, n1, sum2);
 
-		if (verbose > 3)
+		if (verbose > 3) {
 			rprintf(FINFO,
-				"chunk[%d] offset=%.0f len=%d sum1=%08x\n",
-				i, (double) s->sums[i].offset,
-				s->sums[i].len, s->sums[i].sum1);
-
+				"chunk[%d] offset=%.0f len=%d sum1=%08lx\n",
+				i, (double) offset, n1, (unsigned long) sum1);
+		}
+		write_int(f_out, sum1);
+		write_buf(f_out, sum2, sum.s2length);
 		len -= n1;
 		offset += n1;
 	}
-
-	return s;
 }
 
 
@@ -233,13 +214,12 @@ static struct sum_struct *generate_sums(struct map_struct *buf, OFF_T len,
  *
  * @note This comment was added later by mbp who was trying to work it
  * out.  It might be wrong.
- **/ 
+ **/
 void recv_generator(char *fname, struct file_list *flist, int i, int f_out)
-{  
+{
 	int fd;
 	STRUCT_STAT st;
 	struct map_struct *buf;
-	struct sum_struct *s;
 	int statret;
 	struct file_struct *file = flist->files[i];
 	char *fnamecmp;
@@ -263,43 +243,43 @@ void recv_generator(char *fname, struct file_list *flist, int i, int f_out)
 		return;
 	}
 
-	if (statret == 0 && 
-	    !preserve_perms && 
+	if (statret == 0 &&
+	    !preserve_perms &&
 	    (S_ISDIR(st.st_mode) == S_ISDIR(file->mode))) {
 		/* if the file exists already and we aren't perserving
-                   presmissions then act as though the remote end sent
-                   us the file permissions we already have */
+		 * permissions then act as though the remote end sent
+		 * us the file permissions we already have */
 		file->mode = (file->mode & _S_IFMT) | (st.st_mode & ~_S_IFMT);
 	}
 
 	if (S_ISDIR(file->mode)) {
-                /* The file to be received is a directory, so we need
-                 * to prepare appropriately.  If there is already a
-                 * file of that name and it is *not* a directory, then
-                 * we need to delete it.  If it doesn't exist, then
-                 * recursively create it. */
-          
+		/* The file to be received is a directory, so we need
+		 * to prepare appropriately.  If there is already a
+		 * file of that name and it is *not* a directory, then
+		 * we need to delete it.  If it doesn't exist, then
+		 * recursively create it. */
+
 		if (dry_run) return; /* XXXX -- might cause inaccuracies?? -- mbp */
 		if (statret == 0 && !S_ISDIR(st.st_mode)) {
 			if (robust_unlink(fname) != 0) {
 				rprintf(FERROR, RSYNC_NAME
 					": recv_generator: unlink \"%s\" to make room for directory: %s\n",
-                                        fname,strerror(errno));
+					fname,strerror(errno));
 				return;
 			}
 			statret = -1;
 		}
 		if (statret != 0 && do_mkdir(fname,file->mode) != 0 && errno != EEXIST) {
-			if (!(relative_paths && errno==ENOENT && 
-			      create_directory_path(fname, orig_umask)==0 && 
+			if (!(relative_paths && errno==ENOENT &&
+			      create_directory_path(fname, orig_umask)==0 &&
 			      do_mkdir(fname,file->mode)==0)) {
 				rprintf(FERROR, RSYNC_NAME ": recv_generator: mkdir \"%s\": %s (2)\n",
 					fname,strerror(errno));
 			}
 		}
-		/* f_out is set to -1 when doing final directory 
+		/* f_out is set to -1 when doing final directory
 		   permission and modification time repair */
-		if (set_perms(fname,file,NULL,0) && verbose && (f_out != -1)) 
+		if (set_perms(fname,file,NULL,0) && verbose && (f_out != -1))
 			rprintf(FINFO,"%s/\n",fname);
 		return;
 	}
@@ -328,10 +308,10 @@ void recv_generator(char *fname, struct file_list *flist, int i, int f_out)
 					set_perms(fname,file,&st,1);
 					return;
 				}
-			}  
+			}
 			/* Not a symlink, so delete whatever's
 			 * already there and put a new symlink
-			 * in place. */			   
+			 * in place. */
 			delete_file(fname);
 		}
 		if (do_symlink(file->link,fname) != 0) {
@@ -349,9 +329,9 @@ void recv_generator(char *fname, struct file_list *flist, int i, int f_out)
 
 #ifdef HAVE_MKNOD
 	if (am_root && preserve_devices && IS_DEVICE(file->mode)) {
-		if (statret != 0 || 
+		if (statret != 0 ||
 		    st.st_mode != file->mode ||
-		    st.st_rdev != file->rdev) {	
+		    st.st_rdev != file->rdev) {
 			delete_file(fname);
 			if (verbose > 2)
 				rprintf(FINFO,"mknod(%s,0%o,0x%x)\n",
@@ -392,6 +372,18 @@ void recv_generator(char *fname, struct file_list *flist, int i, int f_out)
 			statret = -1;
 		if (statret == -1)
 			errno = saveerrno;
+#if HAVE_LINK
+		else if (link_dest && !dry_run) {
+			if (do_link(fnamecmpbuf, fname) != 0) {
+				if (verbose > 0)
+					rprintf(FINFO,"link %s => %s : %s\n",
+						fnamecmpbuf,
+						fname,
+						strerror(errno));
+			}
+			fnamecmp = fnamecmpbuf;
+		}
+#endif
 		else
 			fnamecmp = fnamecmpbuf;
 	}
@@ -399,7 +391,7 @@ void recv_generator(char *fname, struct file_list *flist, int i, int f_out)
 	if (statret == -1) {
 		if (errno == ENOENT) {
 			write_int(f_out,i);
-			if (!dry_run) send_sums(NULL,f_out);
+			if (!dry_run) write_sum_head(f_out, NULL);
 		} else {
 			if (verbose > 1)
 				rprintf(FERROR, RSYNC_NAME
@@ -416,15 +408,15 @@ void recv_generator(char *fname, struct file_list *flist, int i, int f_out)
 
 		/* now pretend the file didn't exist */
 		write_int(f_out,i);
-		if (!dry_run) send_sums(NULL,f_out);    
+		if (!dry_run) write_sum_head(f_out, NULL);
 		return;
 	}
 
-	if (opt_ignore_existing && fnamecmp == fname) { 
+	if (opt_ignore_existing && fnamecmp == fname) {
 		if (verbose > 1)
 			rprintf(FINFO,"%s exists\n",fname);
 		return;
-	} 
+	}
 
 	if (update_only && cmp_modtime(st.st_mtime,file->modtime)>0 && fnamecmp == fname) {
 		if (verbose > 1)
@@ -445,18 +437,18 @@ void recv_generator(char *fname, struct file_list *flist, int i, int f_out)
 
 	if (disable_deltas_p()) {
 		write_int(f_out,i);
-		send_sums(NULL,f_out);    
+		write_sum_head(f_out, NULL);
 		return;
 	}
 
-	/* open the file */  
+	/* open the file */
 	fd = do_open(fnamecmp, O_RDONLY, 0);
 
 	if (fd == -1) {
 		rprintf(FERROR,RSYNC_NAME": failed to open \"%s\", continuing : %s\n",fnamecmp,strerror(errno));
 		/* pretend the file didn't exist */
 		write_int(f_out,i);
-		send_sums(NULL,f_out);
+		write_sum_head(f_out, NULL);
 		return;
 	}
 
@@ -469,18 +461,15 @@ void recv_generator(char *fname, struct file_list *flist, int i, int f_out)
 	if (verbose > 3)
 		rprintf(FINFO,"gen mapped %s of size %.0f\n",fnamecmp,(double)st.st_size);
 
-	s = generate_sums(buf,st.st_size,adapt_block_size(file, block_size));
-
 	if (verbose > 2)
-		rprintf(FINFO,"sending sums for %d\n",i);
+		rprintf(FINFO, "generating and sending sums for %d\n", i);
 
 	write_int(f_out,i);
-	send_sums(s,f_out);
+	generate_and_send_sums(buf, st.st_size,
+			       adapt_block_size(file, block_size), f_out);
 
 	close(fd);
 	if (buf) unmap_file(buf);
-
-	free_sums(s);
 }
 
 
@@ -496,11 +485,11 @@ void generate_files(int f,struct file_list *flist,char *local_name,int f_recv)
 
 	if (verbose >= 2) {
 		rprintf(FINFO,
-			disable_deltas_p() 
+			disable_deltas_p()
 			? "delta-transmission disabled for local transfer or --whole-file\n"
 			: "delta transmission enabled\n");
 	}
-	
+
 	/* we expect to just sit around now, so don't exit on a
 	   timeout. If we really get a timeout then the other process should
 	   exit */
@@ -516,12 +505,11 @@ void generate_files(int f,struct file_list *flist,char *local_name,int f_recv)
 		   them. This is then fixed after the files are transferred */
 		if (!am_root && S_ISDIR(file->mode)) {
 			file->mode |= S_IWUSR; /* user write */
-                        /* XXX: Could this be causing a problem on SCO?  Perhaps their
-                         * handling of permissions is strange? */
+			/* XXX: Could this be causing a problem on SCO?  Perhaps their
+			 * handling of permissions is strange? */
 		}
 
-		recv_generator(local_name?local_name:f_name(file),
-			       flist,i,f);
+		recv_generator(local_name?local_name:f_name(file), flist,i,f);
 
 		file->mode = saved_mode;
 	}
@@ -535,19 +523,16 @@ void generate_files(int f,struct file_list *flist,char *local_name,int f_recv)
 
 	write_int(f,-1);
 
-	if (remote_version >= 13) {
-		/* in newer versions of the protocol the files can cycle through
-		   the system more than once to catch initial checksum errors */
-		for (i=read_int(f_recv); i != -1; i=read_int(f_recv)) {
-			struct file_struct *file = flist->files[i];
-			recv_generator(local_name?local_name:f_name(file),
-				       flist,i,f);    
-		}
+	/* files can cycle through the system more than once
+	 * to catch initial checksum errors */
+	for (i=read_int(f_recv); i != -1; i=read_int(f_recv)) {
+		struct file_struct *file = flist->files[i];
+		recv_generator(local_name?local_name:f_name(file), flist,i,f);
+	}
 
-		phase++;
-		if (verbose > 2)
-			rprintf(FINFO,"generate_files phase=%d\n",phase);
+	phase++;
+	if (verbose > 2)
+		rprintf(FINFO,"generate_files phase=%d\n",phase);
 
-		write_int(f,-1);
-	}
+	write_int(f,-1);
 }