svn-fast-export.c

   1 /*
   2  * svn-fast-export.c
   3  * ----------
   4  *  Walk through each revision of a local Subversion repository and export it
   5  *  in a stream that git-fast-import can consume.
   6  *
   7  * Author: Chris Lee <clee@kde.org>
   8  * License: MIT <http://www.opensource.org/licenses/mit-license.php>
   9  */
  10
  11 #define _XOPEN_SOURCE
  12 #include <unistd.h>
  13 #include <string.h>
  14 #include <stdio.h>
  15 #include <time.h>
  16
  17 #ifndef PATH_MAX
  18 #define PATH_MAX 4096
  19 #endif
  20
  21 #include <apr_general.h>
  22 #include <apr_lib.h>
  23 #include <apr_getopt.h>
  24
  25 #include <svn_types.h>
  26 #include <svn_pools.h>
  27 #include <svn_repos.h>
  28
  29 #undef SVN_ERR
  30 #define SVN_ERR(expr) SVN_INT_ERR(expr)
  31 #define apr_sane_push(arr, contents) *(char **)apr_array_push(arr) = contents
  32
  33 #define TRUNK "/trunk/"
  34
  35 time_t get_epoch(char *svn_date)
  36 {
  37     struct tm tm = {0};
  38     char *date = malloc(strlen(svn_date) * sizeof(char *));
  39     strncpy(date, svn_date, strlen(svn_date) - 8);
  40     strptime(date, "%Y-%m-%dT%H:%M:%S", &tm);
  41     free(date);
  42     return mktime(&tm);
  43 }
  44
  45 int dump_blob(svn_fs_root_t *root, char *full_path, apr_pool_t *pool)
  46 {
  47     svn_filesize_t stream_length;
  48     svn_stream_t *stream, *outstream;
  49     apr_size_t len;
  50     char buf[8];
  51
  52     SVN_ERR(svn_fs_file_length(&stream_length, root, full_path, pool));
  53     SVN_ERR(svn_fs_file_contents(&stream, root, full_path, pool));
  54
  55     fprintf(stdout, "data %lu\n", stream_length);
  56     fflush(stdout);
  57
  58     SVN_ERR(svn_stream_for_stdout(&outstream, pool));
  59     SVN_ERR(svn_stream_copy(stream, outstream, pool));
  60
  61     fprintf(stdout, "\n");
  62     fflush(stdout);
  63
  64     return 0;
  65 }
  66
  67 int export_revision(svn_revnum_t rev, svn_repos_t *repo, svn_fs_t *fs, apr_pool_t *pool)
  68 {
  69     apr_array_header_t *file_changes;
  70     apr_hash_t *changes, *props;
  71     apr_hash_index_t *i;
  72     apr_pool_t *revpool;
  73
  74     svn_fs_path_change_t *change;
  75     svn_fs_root_t *root_obj;
  76     svn_boolean_t is_dir;
  77     svn_string_t *author, *committer, *svndate, *svnlog;
  78
  79     char *path, *file_change;
  80     unsigned int mark;
  81     const void *key;
  82     void *val;
  83
  84     fprintf(stderr, "Exporting revision %ld... ", rev);
  85
  86     SVN_ERR(svn_fs_revision_root(&root_obj, fs, rev, pool));
  87     SVN_ERR(svn_fs_paths_changed(&changes, root_obj, pool));
  88     SVN_ERR(svn_fs_revision_proplist(&props, fs, rev, pool));
  89
  90     revpool = svn_pool_create(pool);
  91
  92     file_changes = apr_array_make(pool, apr_hash_count(changes), sizeof(char *));
  93     mark = 1;
  94     for (i = apr_hash_first(pool, changes); i; i = apr_hash_next(i)) {
  95         svn_pool_clear(revpool);
  96         apr_hash_this(i, &key, NULL, &val);
  97         path = (char *)key;
  98         change = (svn_fs_path_change_t *)val;
  99
 100         SVN_ERR(svn_fs_is_dir(&is_dir, root_obj, path, revpool));
 101
 102         if (is_dir || strncmp(TRUNK, path, strlen(TRUNK))) {
 103             continue;
 104         }
 105
 106         if (change->change_kind == svn_fs_path_change_delete) {
 107             *(char **)apr_array_push(file_changes) = ((char *)svn_string_createf(pool, "D %s", path + strlen(TRUNK))->data);
 108         } else {
 109             char *file_change;
 110             *(char **)apr_array_push(file_changes) = (char *)svn_string_createf(pool, "M 644 :%u %s", mark, path + strlen(TRUNK))->data;
 111             fprintf(stdout, "blob\nmark :%u\n", mark++);
 112             dump_blob(root_obj, (char *)path, revpool);
 113         }
 114     }
 115
 116     if (file_changes->nelts == 0) {
 117         fprintf(stderr, "skipping.\n");
 118         svn_pool_destroy(revpool);
 119         return 0;
 120     }
 121
 122     author = apr_hash_get(props, "svn:author", APR_HASH_KEY_STRING);
 123     if (!author) { author = svn_string_create("nobody", pool); }
 124     svndate = apr_hash_get(props, "svn:date", APR_HASH_KEY_STRING);
 125     svnlog = apr_hash_get(props, "svn:log", APR_HASH_KEY_STRING);
 126
 127     fprintf(stdout, "commit refs/heads/master\n");
 128     fprintf(stdout, "committer %s <%s@localhost> %ld -0000\n", author->data, author->data, get_epoch((char *)svndate->data));
 129     fprintf(stdout, "data %d\n", svnlog->len);
 130     fputs(svnlog->data, stdout);
 131     fprintf(stdout, "\n");
 132     fputs(apr_array_pstrcat(pool, file_changes, '\n'), stdout);
 133     fprintf(stdout, "\n\n");
 134     fflush(stdout);
 135
 136     svn_pool_destroy(revpool);
 137
 138     fprintf(stderr, "done!\n");
 139
 140     return 0;
 141 }
 142
 143 int crawl_revisions(char *repos_path)
 144 {
 145     apr_pool_t *pool, *subpool;
 146     svn_repos_t *repos;
 147     svn_revnum_t youngest_rev, min_rev, max_rev, rev;
 148     svn_fs_t *fs;
 149
 150     pool = svn_pool_create(NULL);
 151
 152     SVN_ERR(svn_repos_open(&repos, repos_path, pool));
 153
 154     fs = svn_repos_fs(repos);
 155
 156     SVN_ERR(svn_fs_initialize(pool));
 157     SVN_ERR(svn_fs_youngest_rev(&youngest_rev, fs, pool));
 158
 159     min_rev = 1;
 160     max_rev = youngest_rev;
 161
 162     subpool = svn_pool_create(pool);
 163     for (rev = min_rev; rev <= max_rev; rev++) {
 164         svn_pool_clear(subpool);
 165         export_revision(rev, repos, fs, subpool);
 166     }
 167
 168     svn_pool_destroy(pool);
 169
 170     return 0;
 171 }
 172
 173 int main(int argc, char *argv[])
 174 {
 175     if (argc != 2) {
 176         fprintf(stderr, "usage: %s REPOS_PATH\n", argv[0]);
 177         return -1;
 178     }
 179
 180     if (apr_initialize() != APR_SUCCESS) {
 181         fprintf(stderr, "You lose at apr_initialize().\n");
 182         return -1;
 183     }
 184
 185     crawl_revisions(argv[1]);
 186
 187     apr_terminate();
 188
 189     return 0;
 190 }