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Overview
Comment:Additional comments on the changes to deal with git-fast-export tagging, to try to better explain what Git is doing and how we are working around it.
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SHA1:352066b267c392ff958628a99cc99896dd055b8c
User & Date: drh 2011-02-16 15:15:27
Context
2011-02-16
19:13
For the ssh: transport method, use the -T option to disable pseudottys. Increase the size of the buffer for holding the MOTD. check-in: 7c851900 user: drh tags: trunk
15:15
Additional comments on the changes to deal with git-fast-export tagging, to try to better explain what Git is doing and how we are working around it. check-in: 352066b2 user: drh tags: trunk
15:04
Fix a typo on the user_setup screen. check-in: 4dcd9c99 user: drh tags: trunk
Changes

Changes to src/import.c.

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      gg.xFinish = finish_blob;
    }else
    if( memcmp(zLine, "commit ", 7)==0 ){
      gg.xFinish();
      gg.xFinish = finish_commit;
      trim_newline(&zLine[7]);
      z = &zLine[7];



















      for(i=strlen(z)-1; i>=0 && z[i]!='/'; i--){}
      gg.tagCommit = memcmp(&z[i-4], "tags", 4)==0;
      if( z[i+1]!=0 ) z += i+1;
      if( fossil_strcmp(z, "master")==0 ) z = "trunk";
      gg.zBranch = fossil_strdup(z);
      gg.fromLoaded = 0;
    }else
    if( memcmp(zLine, "tag ", 4)==0 ){
      gg.xFinish();
................................................................................
  ** The XMARK table provides a mapping from fast-import "marks" and symbols
  ** into artifact ids (UUIDs - the 40-byte hex SHA1 hash of artifacts). 
  ** Given any valid fast-import symbol, the corresponding fossil rid and
  ** uuid can found by searching against the xmark.tname field.
  **
  ** The XBRANCH table maps commit marks and symbols into the branch those
  ** commits belong to.  If xbranch.tname is a fast-import symbol for a
  ** check-in then xbranch.brnm is the branch that checkin is part of.
  **
  ** The XTAG table records information about tags that need to be applied
  ** to various branches after the import finishes.  The xtag.tcontent field
  ** contains the text of an artifact that will add a tag to a check-in.
  ** These artifacts should all be added at the end of the import.


  */
  db_multi_exec(
     "CREATE TEMP TABLE xmark(tname TEXT UNIQUE, trid INT, tuuid TEXT);"
     "CREATE TEMP TABLE xbranch(tname TEXT UNIQUE, brnm TEXT);"
     "CREATE TEMP TABLE xtag(tname TEXT UNIQUE, tcontent TEXT);"
  );








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      gg.xFinish = finish_blob;
    }else
    if( memcmp(zLine, "commit ", 7)==0 ){
      gg.xFinish();
      gg.xFinish = finish_commit;
      trim_newline(&zLine[7]);
      z = &zLine[7];

      /* The argument to the "commit" line might match either of these
      ** patterns:
      **
      **   (A)  refs/heads/BRANCHNAME
      **   (B)  refs/tags/TAGNAME
      **
      ** If pattern A is used, then the branchname used is as shown.
      ** Except, the "master" branch which is the default branch name in
      ** Git is changed to "trunk" which is the default name in Fossil.
      ** If the pattern is B, then the new commit should be on the same
      ** branch as its parent.  And, we might need to add the TAGNAME
      ** tag to the new commit.  However, if there are multiple instances
      ** of pattern B with the same TAGNAME, then only put the tag on the
      ** last commit that holds that tag.
      **
      ** None of the above is explained in the git-fast-export
      ** documentation.  We had to figure it out via trial and error.
      */
      for(i=strlen(z)-1; i>=0 && z[i]!='/'; i--){}
      gg.tagCommit = memcmp(&z[i-4], "tags", 4)==0;  /* True for pattern B */
      if( z[i+1]!=0 ) z += i+1;
      if( fossil_strcmp(z, "master")==0 ) z = "trunk";
      gg.zBranch = fossil_strdup(z);
      gg.fromLoaded = 0;
    }else
    if( memcmp(zLine, "tag ", 4)==0 ){
      gg.xFinish();
................................................................................
  ** The XMARK table provides a mapping from fast-import "marks" and symbols
  ** into artifact ids (UUIDs - the 40-byte hex SHA1 hash of artifacts). 
  ** Given any valid fast-import symbol, the corresponding fossil rid and
  ** uuid can found by searching against the xmark.tname field.
  **
  ** The XBRANCH table maps commit marks and symbols into the branch those
  ** commits belong to.  If xbranch.tname is a fast-import symbol for a
  ** checkin then xbranch.brnm is the branch that checkin is part of.
  **
  ** The XTAG table records information about tags that need to be applied
  ** to various branches after the import finishes.  The xtag.tcontent field
  ** contains the text of an artifact that will add a tag to a check-in.
  ** The git-fast-export file format might specify the same tag multiple
  ** times but only the last tag should be used.  And we do not know which
  ** occurrence of the tag is the last until the import finishes.
  */
  db_multi_exec(
     "CREATE TEMP TABLE xmark(tname TEXT UNIQUE, trid INT, tuuid TEXT);"
     "CREATE TEMP TABLE xbranch(tname TEXT UNIQUE, brnm TEXT);"
     "CREATE TEMP TABLE xtag(tname TEXT UNIQUE, tcontent TEXT);"
  );