X-Git-Url: https://mattmccutchen.net/rsync/rsync-patches.git/blobdiff_plain/8cec1eadd1339a0efc6ab45f559849143aa16e92..7170ca8dba0a407cd0c91b41b48163c7b682abb1:/link-by-hash.diff diff --git a/link-by-hash.diff b/link-by-hash.diff index f5135b6..1415923 100644 --- a/link-by-hash.diff +++ b/link-by-hash.diff @@ -1,30 +1,55 @@ -After applying this patch and running configure, you MUST run this -command before "make": - - make proto - -Jason M. Felice writes: +Jason M. Felice wrote: This patch adds the --link-by-hash=DIR option, which hard links received files in a link farm arranged by MD4 file hash. The result is that the system will only store one copy of the unique contents of each file, regardless of the file's name. +To use this patch, run these commands for a successful build: ---- Makefile.in 15 May 2004 00:48:11 -0000 1.101 -+++ Makefile.in 30 Jun 2004 00:10:04 -0000 -@@ -35,7 +35,7 @@ OBJS1=rsync.o generator.o receiver.o cle - main.o checksum.o match.o syscall.o log.o backup.o - OBJS2=options.o flist.o io.o compat.o hlink.o token.o uidlist.o socket.o \ - fileio.o batch.o clientname.o + patch -p1 = 8 +diff --git a/hashlink.c b/hashlink.c +new file mode 100644 +--- /dev/null ++++ b/hashlink.c +@@ -0,0 +1,339 @@ +/* + Copyright (C) Cronosys, LLC 2004 + @@ -51,14 +76,12 @@ the file's name. + +#ifdef HAVE_LINK + -+char* make_hash_name(struct file_struct *file) ++char *make_hash_name(struct file_struct *file) +{ + char hash[33], *dst; -+ unsigned char *src; -+ unsigned char c; ++ uchar c, *src = (uchar*)F_SUM(file); + int i; + -+ src = (unsigned char*)file->u.sum; + for (dst = hash, i = 0; i < 4; i++, src++) { + c = *src >> 4; + *(dst++) = (c >= 10) ? (c - 10 + 'a') : (c + '0'); @@ -74,7 +97,8 @@ the file's name. + } + *dst = 0; + -+ asprintf(&dst,"%s/%s",link_by_hash_dir,hash); ++ if (asprintf(&dst,"%s/%s",link_by_hash_dir,hash) < 0) ++ out_of_memory("make_hash_name"); + return dst; +} + @@ -111,11 +135,11 @@ the file's name. + long this_fnbr; + + *fnbr = 0; -+ ++ + /* Build a list of potential candidates and open + * them. */ + if ((d = opendir(hashname)) == NULL) { -+ rsyserr(FERROR, errno, "opendir \"%s\"", hashname); ++ rsyserr(FERROR, errno, "opendir failed: \"%s\"", hashname); + free(hashname); + return NULL; + } @@ -130,11 +154,11 @@ the file's name. + if (this_fnbr > *fnbr) + *fnbr = this_fnbr; + -+ hashfile = (struct hashfile_struct*)malloc(sizeof(struct hashfile_struct)); -+ asprintf(&hashfile->name,"%s/%s",hashname, -+ di->d_name); ++ hashfile = new_array(struct hashfile_struct, 1); ++ if (asprintf(&hashfile->name,"%s/%s",hashname, di->d_name) < 0) ++ out_of_memory("find_hashfiles"); + if (do_stat(hashfile->name,&st) == -1) { -+ rsyserr(FERROR, errno, "%s: %s", hashfile->name); ++ rsyserr(FERROR, errno, "stat failed: %s", hashfile->name); + kill_hashfile(hashfile); + continue; + } @@ -145,7 +169,7 @@ the file's name. + hashfile->nlink = st.st_nlink; + hashfile->fd = open(hashfile->name,O_RDONLY|O_BINARY); + if (hashfile->fd == -1) { -+ rsyserr(FERROR, errno, "%s", hashfile->name); ++ rsyserr(FERROR, errno, "open failed: %s", hashfile->name); + kill_hashfile(hashfile); + continue; + } @@ -210,11 +234,10 @@ the file's name. + /* There are no matches. */ + return NULL; + } -+ + } + + if (amt == -1) { -+ rsyserr(FERROR, errno, "%s"); ++ rsyserr(FERROR, errno, "read failed in compare_hashfiles()"); + kill_hashfiles(files); + return NULL; + } @@ -247,17 +270,16 @@ the file's name. +} + + -+int link_by_hash(char *fnametmp,char *fname,struct file_struct *file) ++int link_by_hash(const char *fnametmp, const char *fname, struct file_struct *file) +{ + STRUCT_STAT st; -+ char *hashname = make_hash_name(file); ++ char *hashname = make_hash_name(file); + int first = 0, rc; + char *linkname; + long last_fnbr; + -+ if (file->length == 0) { -+ return robust_rename(fnametmp,fname,0644); -+ } ++ if (F_LENGTH(file) == 0) ++ return robust_rename(fnametmp, fname, NULL, 0644); + + if (do_stat(hashname, &st) == -1) { + char *dirname; @@ -266,47 +288,48 @@ the file's name. + dirname = strdup(hashname); + *strrchr(dirname,'/') = 0; + if (do_mkdir(dirname, 0755) == -1 && errno != EEXIST) { -+ rsyserr(FERROR, errno, "mkdir %s", dirname); ++ rsyserr(FERROR, errno, "mkdir failed: %s", dirname); + free(hashname); + free(dirname); -+ return robust_rename(fnametmp,fname,0644); ++ return robust_rename(fnametmp, fname, NULL, 0644); + } + free(dirname); + + if (do_mkdir(hashname, 0755) == -1 && errno != EEXIST) { -+ rsyserr(FERROR, errno, "mkdir %s", hashname); ++ rsyserr(FERROR, errno, "mkdir failed: %s", hashname); + free(hashname); -+ return robust_rename(fnametmp,fname,0644); ++ return robust_rename(fnametmp, fname, NULL, 0644); + } + + first = 1; -+ asprintf(&linkname,"%s/0",hashname); ++ if (asprintf(&linkname,"%s/0",hashname) < 0) ++ out_of_memory("link_by_hash"); + rprintf(FINFO, "(1) linkname = %s\n", linkname); -+ + } else { + struct hashfile_struct *hashfiles, *hashfile; -+ int fd; + + if (do_stat(fnametmp,&st) == -1) { -+ rsyserr(FERROR, errno, "%s", fname); ++ rsyserr(FERROR, errno, "stat failed: %s", fname); + return -1; + } + hashfiles = find_hashfiles(hashname, st.st_size, &last_fnbr); + + if (hashfiles == NULL) { + first = 1; -+ asprintf(&linkname,"%s/0",hashname); ++ if (asprintf(&linkname,"%s/0",hashname) < 0) ++ out_of_memory("link_by_hash"); + rprintf(FINFO, "(2) linkname = %s\n", linkname); + } else { -+ ++ int fd; + /* Search for one identical to us. */ + if ((fd = open(fnametmp,O_RDONLY|O_BINARY)) == -1) { -+ rsyserr(FERROR, errno, "%s", fnametmp); ++ rsyserr(FERROR, errno, "open failed: %s", fnametmp); + kill_hashfiles(hashfiles); + return -1; + } + hashfile = compare_hashfiles(fd, hashfiles); + hashfiles = NULL; ++ close(fd); + + if (hashfile) { + first = 0; @@ -315,8 +338,8 @@ the file's name. + kill_hashfile(hashfile); + } else { + first = 1; -+ asprintf(&linkname, "%s/%ld", hashname, -+ last_fnbr + 1); ++ if (asprintf(&linkname, "%s/%ld", hashname, last_fnbr + 1) < 0) ++ out_of_memory("link_by_hash"); + rprintf(FINFO, "(4) linkname = %s\n", linkname); + } + } @@ -325,20 +348,20 @@ the file's name. + if (!first) { + rprintf(FINFO, "link-by-hash (existing): \"%s\" -> %s\n", + linkname, full_fname(fname)); ++ robust_unlink(fname); + rc = do_link(linkname, fname); + if (rc == -1) { + if (errno == EMLINK) { + first = 1; + free(linkname); -+ asprintf(&linkname,"%s/%ld",hashname, -+ last_fnbr + 1); ++ if (asprintf(&linkname,"%s/%ld",hashname, last_fnbr + 1) < 0) ++ out_of_memory("link_by_hash"); + rprintf(FINFO, "(5) linkname = %s\n", linkname); + rprintf(FINFO,"link-by-hash: max link count exceeded, starting new file \"%s\".\n", linkname); + } else { + rsyserr(FERROR, errno, "link \"%s\" -> \"%s\"", + linkname, full_fname(fname)); -+ robust_unlink(fname); -+ rc = robust_rename(fnametmp,fname,0644); ++ rc = robust_rename(fnametmp, fname, NULL, 0644); + } + } else { + do_unlink(fnametmp); @@ -349,7 +372,7 @@ the file's name. + rprintf(FINFO, "link-by-hash (new): %s -> \"%s\"\n", + full_fname(fname),linkname); + -+ rc = robust_rename(fnametmp,fname,0644); ++ rc = robust_rename(fnametmp, fname, NULL, 0644); + if (rc != 0) { + rsyserr(FERROR, errno, "rename \"%s\" -> \"%s\"", + full_fname(fnametmp), full_fname(fname)); @@ -365,51 +388,53 @@ the file's name. + free(hashname); + return rc; +} -+ +#endif ---- options.c 20 Jun 2004 19:47:05 -0000 1.157 -+++ options.c 30 Jun 2004 00:10:04 -0000 -@@ -124,6 +124,7 @@ char *log_format = NULL; - char *password_file = NULL; - char *rsync_path = RSYNC_PATH; - char *backup_dir = NULL; +diff --git a/options.c b/options.c +--- a/options.c ++++ b/options.c +@@ -158,6 +158,7 @@ char *backup_suffix = NULL; + char *tmpdir = NULL; + char *partial_dir = NULL; + char *basis_dir[MAX_BASIS_DIRS+1]; +char *link_by_hash_dir = NULL; - char backup_dir_buf[MAXPATHLEN]; - int rsync_port = RSYNC_PORT; - int link_dest = 0; -@@ -270,6 +271,7 @@ void usage(enum logcode F) - rprintf(F," -T --temp-dir=DIR create temporary files in directory DIR\n"); + char *config_file = NULL; + char *shell_cmd = NULL; + char *logfile_name = NULL; +@@ -745,6 +746,7 @@ void usage(enum logcode F) rprintf(F," --compare-dest=DIR also compare destination files relative to DIR\n"); - rprintf(F," --link-dest=DIR create hardlinks to DIR for unchanged files\n"); -+ rprintf(F," --link-by-hash=DIR create hardlinks by hash to DIR for regular files\n"); - rprintf(F," -P equivalent to --partial --progress\n"); - rprintf(F," -z, --compress compress file data\n"); - rprintf(F," -C, --cvs-exclude auto ignore files in the same way CVS does\n"); -@@ -310,7 +312,7 @@ void usage(enum logcode F) - enum {OPT_VERSION = 1000, OPT_SENDER, OPT_EXCLUDE, OPT_EXCLUDE_FROM, - OPT_DELETE_AFTER, OPT_DELETE_EXCLUDED, OPT_LINK_DEST, - OPT_INCLUDE, OPT_INCLUDE_FROM, OPT_MODIFY_WINDOW, -- OPT_READ_BATCH, OPT_WRITE_BATCH, OPT_TIMEOUT, -+ OPT_READ_BATCH, OPT_WRITE_BATCH, OPT_TIMEOUT, OPT_LINK_BY_HASH, - OPT_REFUSED_BASE = 9000}; + rprintf(F," --copy-dest=DIR ... and include copies of unchanged files\n"); + rprintf(F," --link-dest=DIR hardlink to files in DIR when unchanged\n"); ++ rprintf(F," --link-by-hash=DIR create hardlinks by hash into DIR\n"); + rprintf(F," -z, --compress compress file data during the transfer\n"); + rprintf(F," --compress-level=NUM explicitly set compression level\n"); + rprintf(F," --skip-compress=LIST skip compressing files with a suffix in LIST\n"); +@@ -798,7 +800,7 @@ enum {OPT_VERSION = 1000, OPT_DAEMON, OPT_SENDER, OPT_EXCLUDE, OPT_EXCLUDE_FROM, + OPT_INCLUDE, OPT_INCLUDE_FROM, OPT_MODIFY_WINDOW, OPT_MIN_SIZE, OPT_CHMOD, + OPT_READ_BATCH, OPT_WRITE_BATCH, OPT_ONLY_WRITE_BATCH, OPT_MAX_SIZE, + OPT_NO_D, OPT_APPEND, OPT_NO_ICONV, OPT_INFO, OPT_DEBUG, +- OPT_USERMAP, OPT_GROUPMAP, OPT_CHOWN, ++ OPT_USERMAP, OPT_GROUPMAP, OPT_CHOWN, OPT_LINK_BY_HASH, + OPT_SERVER, OPT_REFUSED_BASE = 9000}; static struct poptOption long_options[] = { -@@ -368,6 +370,7 @@ static struct poptOption long_options[] - {"temp-dir", 'T', POPT_ARG_STRING, &tmpdir, 0, 0, 0 }, - {"compare-dest", 0, POPT_ARG_STRING, &compare_dest, 0, 0, 0 }, - {"link-dest", 0, POPT_ARG_STRING, &compare_dest, OPT_LINK_DEST, 0, 0 }, -+ {"link-by-hash", 0, POPT_ARG_STRING, 0, OPT_LINK_BY_HASH, 0, 0}, - /* TODO: Should this take an optional int giving the compression level? */ - {"compress", 'z', POPT_ARG_NONE, &do_compression, 0, 0, 0 }, - {"daemon", 0, POPT_ARG_NONE, &daemon_opt, 0, 0, 0 }, -@@ -596,6 +599,19 @@ int parse_arguments(int *argc, const cha +@@ -937,6 +939,7 @@ static struct poptOption long_options[] = { + {"compare-dest", 0, POPT_ARG_STRING, 0, OPT_COMPARE_DEST, 0, 0 }, + {"copy-dest", 0, POPT_ARG_STRING, 0, OPT_COPY_DEST, 0, 0 }, + {"link-dest", 0, POPT_ARG_STRING, 0, OPT_LINK_DEST, 0, 0 }, ++ {"link-by-hash", 0, POPT_ARG_STRING, 0, OPT_LINK_BY_HASH, 0, 0}, + {"fuzzy", 'y', POPT_ARG_VAL, &fuzzy_basis, 1, 0, 0 }, + {"no-fuzzy", 0, POPT_ARG_VAL, &fuzzy_basis, 0, 0, 0 }, + {"no-y", 0, POPT_ARG_VAL, &fuzzy_basis, 0, 0, 0 }, +@@ -1743,6 +1746,21 @@ int parse_arguments(int *argc_p, const char ***argv_p) return 0; #endif + case OPT_LINK_BY_HASH: -+#if HAVE_LINK -+ link_by_hash_dir = (char *)poptGetOptArg(pc); -+ checksum_seed = FIXED_CHECKSUM_SEED; ++#ifdef HAVE_LINK ++ arg = poptGetOptArg(pc); ++ if (sanitize_paths) ++ arg = sanitize_path(NULL, arg, NULL, 0, SP_DEFAULT); ++ link_by_hash_dir = (char *)arg; + break; +#else + snprintf(err_buf, sizeof err_buf, @@ -421,148 +446,127 @@ the file's name. + default: /* A large opt value means that set_refuse_options() - * turned this option off (opt-BASE is its index). */ -@@ -977,6 +993,11 @@ void server_options(char **args,int *arg - args[ac++] = compare_dest; - } + * turned this option off. */ +@@ -2601,6 +2619,11 @@ void server_options(char **args, int *argc_p) + } else if (inplace) + args[ac++] = "--inplace"; + if (link_by_hash_dir && am_sender) { + args[ac++] = "--link-by-hash"; + args[ac++] = link_by_hash_dir; + } + - if (files_from && (!am_sender || remote_filesfrom_file)) { - if (remote_filesfrom_file) { + if (files_from && (!am_sender || filesfrom_host)) { + if (filesfrom_host) { args[ac++] = "--files-from"; ---- receiver.c 29 Jun 2004 15:12:01 -0000 1.83 -+++ receiver.c 30 Jun 2004 00:10:04 -0000 -@@ -48,6 +48,7 @@ extern int ignore_errors; - extern int orig_umask; - extern int keep_partial; - extern int checksum_seed; -+extern char *link_by_hash_dir; - - static void delete_one(char *fn, int is_dir) - { -@@ -198,10 +199,11 @@ static int get_tmpname(char *fnametmp, c +diff --git a/receiver.c b/receiver.c +--- a/receiver.c ++++ b/receiver.c +@@ -164,11 +164,13 @@ int open_tmpfile(char *fnametmp, const char *fname, struct file_struct *file) + } - - static int receive_data(int f_in,struct map_struct *mapbuf,int fd,char *fname, -- OFF_T total_size) -+ OFF_T total_size,char *md4) + static int receive_data(int f_in, char *fname_r, int fd_r, OFF_T size_r, +- const char *fname, int fd, OFF_T total_size) ++ const char *fname, int fd, OFF_T total_size, ++ const char *md4) { - int i; + static char file_sum1[MAX_DIGEST_LEN]; + struct map_struct *mapbuf; struct sum_struct sum; -+ struct mdfour mdfour_data; - unsigned int len; ++ md_context mdfour_data; + int32 len; OFF_T offset = 0; OFF_T offset2; -@@ -212,6 +214,9 @@ static int receive_data(int f_in,struct - - read_sum_head(f_in, &sum); +@@ -188,6 +190,9 @@ static int receive_data(int f_in, char *fname_r, int fd_r, OFF_T size_r, + } else + mapbuf = NULL; + if (md4) + mdfour_begin(&mdfour_data); + sum_init(checksum_seed); - while ((i = recv_token(f_in, &data)) != 0) { -@@ -228,6 +233,8 @@ static int receive_data(int f_in,struct + if (append_mode > 0) { +@@ -232,6 +237,8 @@ static int receive_data(int f_in, char *fname_r, int fd_r, OFF_T size_r, cleanup_got_literal = 1; - sum_update(data,i); + sum_update(data, i); + if (md4) -+ mdfour_update(&mdfour_data,data,i); ++ mdfour_update(&mdfour_data, (uchar*)data, i); - if (fd != -1 && write_file(fd,data,i) != i) { - rsyserr(FERROR, errno, "write failed on %s", -@@ -255,6 +262,8 @@ static int receive_data(int f_in,struct + if (fd != -1 && write_file(fd,data,i) != i) + goto report_write_error; +@@ -258,6 +265,8 @@ static int receive_data(int f_in, char *fname_r, int fd_r, OFF_T size_r, see_token(map, len); - sum_update(map,len); + sum_update(map, len); + if (md4) -+ mdfour_update(&mdfour_data,map,len); ++ mdfour_update(&mdfour_data, (uchar*)map, len); } - if (fd != -1 && write_file(fd,map,len) != (int) len) { -@@ -277,6 +286,8 @@ static int receive_data(int f_in,struct - } + if (updating_basis_or_equiv) { +@@ -305,6 +314,9 @@ static int receive_data(int f_in, char *fname_r, int fd_r, OFF_T size_r, + if (sum_end(file_sum1) != checksum_len) + overflow_exit("checksum_len"); /* Impossible... */ - sum_end(file_sum1); + if (md4) -+ mdfour_result(&mdfour_data, (unsigned char*)md4); ++ mdfour_result(&mdfour_data, (uchar*)md4); ++ + if (mapbuf) + unmap_file(mapbuf); - read_buf(f_in,file_sum2,MD4_SUM_LENGTH); - if (verbose > 2) { -@@ -380,7 +391,7 @@ int recv_files(int f_in,struct file_list - if (fd1 != -1 && do_fstat(fd1,&st) != 0) { - rsyserr(FERROR, errno, "fstat %s failed", - full_fname(fnamecmp)); -- receive_data(f_in,NULL,-1,NULL,file->length); -+ receive_data(f_in,NULL,-1,NULL,file->length,NULL); - close(fd1); - continue; - } -@@ -393,7 +404,7 @@ int recv_files(int f_in,struct file_list - */ - rprintf(FERROR,"recv_files: %s is a directory\n", - full_fname(fnamecmp)); -- receive_data(f_in, NULL, -1, NULL, file->length); -+ receive_data(f_in,NULL,-1,NULL,file->length,NULL); - close(fd1); - continue; - } -@@ -447,7 +458,7 @@ int recv_files(int f_in,struct file_list - if (fd2 == -1) { - rsyserr(FERROR, errno, "mkstemp %s failed", - full_fname(fnametmp)); -- receive_data(f_in,mapbuf,-1,NULL,file->length); -+ receive_data(f_in,mapbuf,-1,NULL,file->length,NULL); - if (mapbuf) unmap_file(mapbuf); - if (fd1 != -1) close(fd1); - continue; -@@ -460,7 +471,11 @@ int recv_files(int f_in,struct file_list - } +@@ -319,7 +331,7 @@ static int receive_data(int f_in, char *fname_r, int fd_r, OFF_T size_r, + + static void discard_receive_data(int f_in, OFF_T length) + { +- receive_data(f_in, NULL, -1, 0, NULL, -1, length); ++ receive_data(f_in, NULL, -1, 0, NULL, -1, length, NULL); + } + + static void handle_delayed_updates(char *local_name) +@@ -744,7 +756,7 @@ int recv_files(int f_in, char *local_name) /* recv file data */ -- recv_ok = receive_data(f_in,mapbuf,fd2,fname,file->length); -+#ifdef HAVE_LINK -+ if (link_by_hash_dir) -+ file->u.sum = (char*)malloc(MD4_SUM_LENGTH); -+#endif -+ recv_ok = receive_data(f_in,mapbuf,fd2,fname,file->length,file->u.sum); + recv_ok = receive_data(f_in, fnamecmp, fd1, st.st_size, +- fname, fd2, F_LENGTH(file)); ++ fname, fd2, F_LENGTH(file), F_SUM(file)); - log_recv(file, &initial_stats); + log_item(log_code, file, &initial_stats, iflags, NULL); ---- rsync.c 11 Jun 2004 07:40:45 -0000 1.141 -+++ rsync.c 30 Jun 2004 00:10:04 -0000 -@@ -34,6 +34,7 @@ extern int force_delete; - extern int recurse; +diff --git a/rsync.c b/rsync.c +--- a/rsync.c ++++ b/rsync.c +@@ -48,6 +48,7 @@ extern int flist_eof; + extern int msgs2stderr; + extern int keep_dirlinks; extern int make_backups; - extern char *backup_dir; +extern char *link_by_hash_dir; - - - /* -@@ -239,8 +240,12 @@ void finish_transfer(char *fname, char * - if (make_backups && !make_backup(fname)) - return; - -- /* move tmp file over real file */ -- ret = robust_rename(fnametmp, fname, file->mode & INITACCESSPERMS); + extern struct file_list *cur_flist, *first_flist, *dir_flist; + extern struct chmod_mode_struct *daemon_chmod_modes; + #ifdef ICONV_OPTION +@@ -575,8 +576,15 @@ int finish_transfer(const char *fname, const char *fnametmp, + /* move tmp file over real file */ + if (DEBUG_GTE(RECV, 1)) + rprintf(FINFO, "renaming %s to %s\n", fnametmp, fname); +- ret = robust_rename(fnametmp, fname, temp_copy_name, +- file->mode & INITACCESSPERMS); +#ifdef HAVE_LINK + if (link_by_hash_dir) + ret = link_by_hash(fnametmp, fname, file); + else +#endif -+ ret = robust_rename(fnametmp, fname, file->mode & INITACCESSPERMS); ++ { ++ ret = robust_rename(fnametmp, fname, temp_copy_name, ++ file->mode & INITACCESSPERMS); ++ } if (ret < 0) { - rsyserr(FERROR, errno, "%s %s -> \"%s\"", - ret == -2 ? "copy" : "rename", ---- rsync.h 16 May 2004 07:28:24 -0000 1.204 -+++ rsync.h 30 Jun 2004 00:10:04 -0000 -@@ -522,6 +522,14 @@ struct stats { - int current_file_index; + rsyserr(FERROR_XFER, errno, "%s %s -> \"%s\"", + ret == -2 ? "copy" : "rename", +diff --git a/rsync.h b/rsync.h +--- a/rsync.h ++++ b/rsync.h +@@ -854,6 +854,14 @@ struct stats { + int xferred_files; }; +struct hashfile_struct { @@ -573,6 +577,17 @@ the file's name. + uint32 nlink; +}; + + struct chmod_mode_struct; - /* we need this function because of the silly way in which duplicate - entries are handled in the file lists - we can't change this + struct flist_ndx_item { +diff --git a/rsync.yo b/rsync.yo +--- a/rsync.yo ++++ b/rsync.yo +@@ -400,6 +400,7 @@ to the detailed description below for a complete description. verb( + --compare-dest=DIR also compare received files relative to DIR + --copy-dest=DIR ... and include copies of unchanged files + --link-dest=DIR hardlink to files in DIR when unchanged ++ --link-by-hash=DIR create hardlinks by hash into DIR + -z, --compress compress file data during the transfer + --compress-level=NUM explicitly set compression level + --skip-compress=LIST skip compressing files with suffix in LIST