vcs-svn/fast_export.c

   1 /*
   2  * Licensed under a two-clause BSD-style license.
   3  * See LICENSE for details.
   4  */
   5
   6 #include "git-compat-util.h"
   7 #include "fast_export.h"
   8 #include "line_buffer.h"
   9 #include "repo_tree.h"
  10 #include "string_pool.h"
  11 #include "strbuf.h"
  12
  13 #define MAX_GITSVN_LINE_LEN 4096
  14
  15 static uint32_t first_commit_done;
  16 static struct line_buffer report_buffer = LINE_BUFFER_INIT;
  17
  18 void fast_export_init(int fd)
  19 {
  20         if (buffer_fdinit(&report_buffer, fd))
  21                 die_errno("cannot read from file descriptor %d", fd);
  22 }
  23
  24 void fast_export_deinit(void)
  25 {
  26         if (buffer_deinit(&report_buffer))
  27                 die_errno("error closing fast-import feedback stream");
  28 }
  29
  30 void fast_export_reset(void)
  31 {
  32         buffer_reset(&report_buffer);
  33 }
  34
  35 void fast_export_delete(uint32_t depth, const uint32_t *path)
  36 {
  37         printf("D \"");
  38         pool_print_seq_q(depth, path, '/', stdout);
  39         printf("\"\n");
  40 }
  41
  42 static void fast_export_truncate(uint32_t depth, const uint32_t *path, uint32_t mode)
  43 {
  44         fast_export_modify(depth, path, mode, "inline");
  45         printf("data 0\n\n");
  46 }
  47
  48 void fast_export_modify(uint32_t depth, const uint32_t *path, uint32_t mode,
  49                         const char *dataref)
  50 {
  51         /* Mode must be 100644, 100755, 120000, or 160000. */
  52         if (!dataref) {
  53                 fast_export_truncate(depth, path, mode);
  54                 return;
  55         }
  56         printf("M %06"PRIo32" %s \"", mode, dataref);
  57         pool_print_seq_q(depth, path, '/', stdout);
  58         printf("\"\n");
  59 }
  60
  61 static char gitsvnline[MAX_GITSVN_LINE_LEN];
  62 void fast_export_begin_commit(uint32_t revision, uint32_t author, char *log,
  63                         uint32_t uuid, uint32_t url,
  64                         unsigned long timestamp)
  65 {
  66         if (!log)
  67                 log = "";
  68         if (~uuid && ~url) {
  69                 snprintf(gitsvnline, MAX_GITSVN_LINE_LEN,
  70                                 "\n\ngit-svn-id: %s@%"PRIu32" %s\n",
  71                                  pool_fetch(url), revision, pool_fetch(uuid));
  72         } else {
  73                 *gitsvnline = '\0';
  74         }
  75         printf("commit refs/heads/master\n");
  76         printf("mark :%"PRIu32"\n", revision);
  77         printf("committer %s <%s@%s> %ld +0000\n",
  78                    ~author ? pool_fetch(author) : "nobody",
  79                    ~author ? pool_fetch(author) : "nobody",
  80                    ~uuid ? pool_fetch(uuid) : "local", timestamp);
  81         printf("data %"PRIu32"\n%s%s\n",
  82                    (uint32_t) (strlen(log) + strlen(gitsvnline)),
  83                    log, gitsvnline);
  84         if (!first_commit_done) {
  85                 if (revision > 1)
  86                         printf("from :%"PRIu32"\n", revision - 1);
  87                 first_commit_done = 1;
  88         }
  89 }
  90
  91 void fast_export_end_commit(uint32_t revision)
  92 {
  93         printf("progress Imported commit %"PRIu32".\n\n", revision);
  94 }
  95
  96 static void ls_from_rev(uint32_t rev, uint32_t depth, const uint32_t *path)
  97 {
  98         /* ls :5 path/to/old/file */
  99         printf("ls :%"PRIu32" \"", rev);
 100         pool_print_seq_q(depth, path, '/', stdout);
 101         printf("\"\n");
 102         fflush(stdout);
 103 }
 104
 105 static void ls_from_active_commit(uint32_t depth, const uint32_t *path)
 106 {
 107         /* ls "path/to/file" */
 108         printf("ls \"");
 109         pool_print_seq_q(depth, path, '/', stdout);
 110         printf("\"\n");
 111         fflush(stdout);
 112 }
 113
 114 static const char *get_response_line(void)
 115 {
 116         const char *line = buffer_read_line(&report_buffer);
 117         if (line)
 118                 return line;
 119         if (buffer_ferror(&report_buffer))
 120                 die_errno("error reading from fast-import");
 121         die("unexpected end of fast-import feedback");
 122 }
 123
 124 void fast_export_data(uint32_t mode, uint32_t len, struct line_buffer *input)
 125 {
 126         if (mode == REPO_MODE_LNK) {
 127                 /* svn symlink blobs start with "link " */
 128                 buffer_skip_bytes(input, 5);
 129                 len -= 5;
 130         }
 131         printf("data %"PRIu32"\n", len);
 132         buffer_copy_bytes(input, len);
 133         fputc('\n', stdout);
 134 }
 135
 136 static int parse_ls_response(const char *response, uint32_t *mode,
 137                                         struct strbuf *dataref)
 138 {
 139         const char *tab;
 140         const char *response_end;
 141
 142         assert(response);
 143         response_end = response + strlen(response);
 144
 145         if (*response == 'm') { /* Missing. */
 146                 errno = ENOENT;
 147                 return -1;
 148         }
 149
 150         /* Mode. */
 151         if (response_end - response < strlen("100644") ||
 152             response[strlen("100644")] != ' ')
 153                 die("invalid ls response: missing mode: %s", response);
 154         *mode = 0;
 155         for (; *response != ' '; response++) {
 156                 char ch = *response;
 157                 if (ch < '0' || ch > '7')
 158                         die("invalid ls response: mode is not octal: %s", response);
 159                 *mode *= 8;
 160                 *mode += ch - '0';
 161         }
 162
 163         /* ' blob ' or ' tree ' */
 164         if (response_end - response < strlen(" blob ") ||
 165             (response[1] != 'b' && response[1] != 't'))
 166                 die("unexpected ls response: not a tree or blob: %s", response);
 167         response += strlen(" blob ");
 168
 169         /* Dataref. */
 170         tab = memchr(response, '\t', response_end - response);
 171         if (!tab)
 172                 die("invalid ls response: missing tab: %s", response);
 173         strbuf_add(dataref, response, tab - response);
 174         return 0;
 175 }
 176
 177 int fast_export_ls_rev(uint32_t rev, uint32_t depth, const uint32_t *path,
 178                                 uint32_t *mode, struct strbuf *dataref)
 179 {
 180         ls_from_rev(rev, depth, path);
 181         return parse_ls_response(get_response_line(), mode, dataref);
 182 }
 183
 184 int fast_export_ls(uint32_t depth, const uint32_t *path,
 185                                 uint32_t *mode, struct strbuf *dataref)
 186 {
 187         ls_from_active_commit(depth, path);
 188         return parse_ls_response(get_response_line(), mode, dataref);
 189 }