xattrs.diff

   1 This patch adds backward-compatibility support for the --xattrs option.
   2 Since the main release has never had xattr support, the trunk doesn't
   3 need this code.  If you want to make rsync 3.0.x communicate with an
   4 older (patched) release, use this.
   5
   6 To use this patch, run these commands for a successful build:
   7
   8     patch -p1 <patches/acls.diff
   9     patch -p1 <patches/xattrs.diff
  10     ./configure                         (optional if already run)
  11     make
  12
  13 --- old/compat.c
  14 +++ new/compat.c
  15 @@ -115,13 +115,6 @@ void setup_protocol(int f_out,int f_in)
  16                             protocol_version);
  17                         exit_cleanup(RERR_PROTOCOL);
  18                 }
  19 -               if (preserve_xattrs) {
  20 -                       rprintf(FERROR,
  21 -                           "--xattrs requires protocol 30 or higher"
  22 -                           " (negotiated %d).\n",
  23 -                           protocol_version);
  24 -                       exit_cleanup(RERR_PROTOCOL);
  25 -               }
  26         }
  27
  28         if (delete_mode && !(delete_before+delete_during+delete_after)) {
  29 --- old/testsuite/xattrs.test
  30 +++ new/testsuite/xattrs.test
  31 @@ -9,10 +9,6 @@
  32
  33  $RSYNC --version | grep ", xattrs" >/dev/null || test_skipped "Rsync is configured without xattr support"
  34
  35 -case "$RSYNC" in
  36 -*protocol=29*) test_skipped "xattr support requires protocol 30" ;;
  37 -esac
  38 -
  39  case "`xattr 2>&1`" in
  40  *--list:*)
  41      xset() {
  42 --- old/xattrs.c
  43 +++ new/xattrs.c
  44 @@ -20,6 +20,7 @@
  45   */
  46
  47  #include "rsync.h"
  48 +#include "io.h"
  49  #include "lib/sysxattrs.h"
  50
  51  #ifdef SUPPORT_XATTRS
  52 @@ -31,6 +32,7 @@ extern int am_generator;
  53  extern int read_only;
  54  extern int list_only;
  55  extern int checksum_seed;
  56 +extern int protocol_version;
  57
  58  #define RSYNC_XAL_INITIAL 5
  59  #define RSYNC_XAL_LIST_INITIAL 100
  60 @@ -222,7 +224,7 @@ static int rsync_xal_get(const char *fna
  61                 if (!(ptr = get_xattr_data(fname, name, &datum_len, 0)))
  62                         return -1;
  63
  64 -               if (datum_len > MAX_FULL_DATUM) {
  65 +               if (datum_len > MAX_FULL_DATUM && protocol_version >= 30) {
  66                         /* For large datums, we store a flag and a checksum. */
  67                         name_offset = 1 + MAX_DIGEST_LEN;
  68                         sum_init(checksum_seed);
  69 @@ -278,7 +280,7 @@ static int find_matching_xattr(item_list
  70                          || rxas1[j].datum_len != rxas2[j].datum_len
  71                          || strcmp(rxas1[j].name, rxas2[j].name))
  72                                 break;
  73 -                       if (rxas1[j].datum_len > MAX_FULL_DATUM) {
  74 +                       if (rxas1[j].datum_len > MAX_FULL_DATUM && protocol_version >= 30) {
  75                                 if (memcmp(rxas1[j].datum + 1,
  76                                            rxas2[j].datum + 1,
  77                                            MAX_DIGEST_LEN) != 0)
  78 @@ -315,34 +317,43 @@ int send_xattr(statx *sxp, int f)
  79  {
  80         int ndx = find_matching_xattr(sxp->xattr);
  81
  82 -       /* Send 0 (-1 + 1) to indicate that literal xattr data follows. */
  83 -       write_abbrevint(f, ndx + 1);
  84 +       if (protocol_version < 30) {
  85 +               if (ndx < 0)
  86 +                       write_byte(f, 'X');
  87 +               else {
  88 +                       write_byte(f, 'x');
  89 +                       write_int(f, ndx);
  90 +               }
  91 +       } else {
  92 +               /* Send 0 (-1 + 1) to indicate that literal xattr data follows. */
  93 +               write_abbrevint(f, ndx + 1);
  94 +       }
  95
  96         if (ndx < 0) {
  97                 rsync_xa *rxa;
  98                 int count = sxp->xattr->count;
  99 -               write_abbrevint(f, count);
 100 +               write_abbrevint30(f, count);
 101                 for (rxa = sxp->xattr->items; count--; rxa++) {
 102  #ifdef HAVE_LINUX_XATTRS
 103 -                       write_abbrevint(f, rxa->name_len);
 104 -                       write_abbrevint(f, rxa->datum_len);
 105 +                       write_abbrevint30(f, rxa->name_len);
 106 +                       write_abbrevint30(f, rxa->datum_len);
 107                         write_buf(f, rxa->name, rxa->name_len);
 108  #else
 109                         /* We strip the rsync prefix from disguised namespaces
 110                          * and put everything else in the user namespace. */
 111                         if (HAS_PREFIX(rxa->name, RSYNC_PREFIX)
 112                          && rxa->name[RPRE_LEN] != '%') {
 113 -                               write_abbrevint(f, rxa->name_len - RPRE_LEN);
 114 -                               write_abbrevint(f, rxa->datum_len);
 115 +                               write_abbrevint30(f, rxa->name_len - RPRE_LEN);
 116 +                               write_abbrevint30(f, rxa->datum_len);
 117                                 write_buf(f, rxa->name + RPRE_LEN, rxa->name_len - RPRE_LEN);
 118                         } else {
 119 -                               write_abbrevint(f, rxa->name_len + UPRE_LEN);
 120 -                               write_abbrevint(f, rxa->datum_len);
 121 +                               write_abbrevint30(f, rxa->name_len + UPRE_LEN);
 122 +                               write_abbrevint30(f, rxa->datum_len);
 123                                 write_buf(f, USER_PREFIX, UPRE_LEN);
 124                                 write_buf(f, rxa->name, rxa->name_len);
 125                         }
 126  #endif
 127 -                       if (rxa->datum_len > MAX_FULL_DATUM)
 128 +                       if (rxa->datum_len > MAX_FULL_DATUM && protocol_version >= 30)
 129                                 write_buf(f, rxa->datum + 1, MAX_DIGEST_LEN);
 130                         else
 131                                 write_buf(f, rxa->datum, rxa->datum_len);
 132 @@ -392,7 +403,7 @@ int xattr_diff(struct file_struct *file,
 133                 cmp = rec_cnt ? strcmp(snd_rxa->name, rec_rxa->name) : -1;
 134                 if (cmp > 0)
 135                         same = 0;
 136 -               else if (snd_rxa->datum_len > MAX_FULL_DATUM) {
 137 +               else if (snd_rxa->datum_len > MAX_FULL_DATUM && protocol_version >= 30) {
 138                         same = cmp == 0 && snd_rxa->datum_len == rec_rxa->datum_len
 139                             && memcmp(snd_rxa->datum + 1, rec_rxa->datum + 1,
 140                                       MAX_DIGEST_LEN) == 0;
 141 @@ -435,6 +446,9 @@ void send_xattr_request(const char *fnam
 142         int j, cnt, prior_req = -1;
 143         rsync_xa *rxa;
 144
 145 +       if (protocol_version < 30)
 146 +               return;
 147 +
 148         lst += F_XATTR(file);
 149         cnt = lst->count;
 150         for (rxa = lst->items, j = 0; j < cnt; rxa++, j++) {
 151 @@ -506,6 +520,9 @@ void recv_xattr_request(struct file_stru
 152         rsync_xa *rxa;
 153         int rel_pos, cnt;
 154
 155 +       if (protocol_version < 30)
 156 +               return;
 157 +
 158         if (F_XATTR(file) < 0) {
 159                 rprintf(FERROR, "recv_xattr_request: internal data error!\n");
 160                 exit_cleanup(RERR_STREAMIO);
 161 @@ -552,7 +569,22 @@ void receive_xattr(struct file_struct *f
 162  {
 163         static item_list temp_xattr = EMPTY_ITEM_LIST;
 164         int count;
 165 -       int ndx = read_abbrevint(f);
 166 +       int ndx;
 167 +
 168 +       if (protocol_version >= 30)
 169 +               ndx = read_abbrevint(f);
 170 +       else {
 171 +               int tag = read_byte(f);
 172 +               if (tag == 'x')
 173 +                       ndx = read_int(f) + 1;
 174 +               else if (tag == 'X')
 175 +                       ndx = 0;
 176 +               else {
 177 +                       rprintf(FERROR, "receive_xattr: unknown extended attribute"
 178 +                               " type tag (%02x) for %s\n", tag, f_name(file, NULL));
 179 +                       exit_cleanup(RERR_STREAMIO);
 180 +               }
 181 +       }
 182
 183         if (ndx < 0 || (size_t)ndx > rsync_xal_l.count) {
 184                 rprintf(FERROR, "receive_xattr: xa index %d out of"
 185 @@ -565,7 +597,7 @@ void receive_xattr(struct file_struct *f
 186                 return;
 187         }
 188
 189 -       if ((count = read_abbrevint(f)) != 0) {
 190 +       if ((count = read_abbrevint30(f)) != 0) {
 191                 (void)EXPAND_ITEM_LIST(&temp_xattr, rsync_xa, count);
 192                 temp_xattr.count = 0;
 193         }
 194 @@ -573,9 +605,10 @@ void receive_xattr(struct file_struct *f
 195         while (count--) {
 196                 char *ptr, *name;
 197                 rsync_xa *rxa;
 198 -               size_t name_len = read_abbrevint(f);
 199 -               size_t datum_len = read_abbrevint(f);
 200 -               size_t dget_len = datum_len > MAX_FULL_DATUM ? 1 + MAX_DIGEST_LEN : datum_len;
 201 +               size_t name_len = read_abbrevint30(f);
 202 +               size_t datum_len = read_abbrevint30(f);
 203 +               size_t dget_len = datum_len > MAX_FULL_DATUM && protocol_version >= 30
 204 +                               ? 1 + MAX_DIGEST_LEN : datum_len;
 205  #ifdef HAVE_LINUX_XATTRS
 206                 size_t extra_len = 0;
 207  #else