fast-export: deal with tag objects that do not have a tagger

When no tagger was found (old Git produced tags like this),
no "tagger" line is printed (but this is incompatible with the current
git fast-import).

Alternatively, you can pass the option --fake-missing-tagger, forcing
fast-export to fake a tagger

	Unspecified Tagger <no-tagger>

with a tag date of the beginning of (Unix) time in the case of a missing
tagger, so that fast-import is still able to import the result.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/git-fast-export.txt b/Documentation/git-fast-export.txt
index b974e2115b01f17f0ac809b691baf2f4e4d32169..539decbeb2c442633a9c40cbd03ce641bcf115b8 100644 (file)
--- a/Documentation/git-fast-export.txt
+++ b/Documentation/git-fast-export.txt
@@ -65,6 +65,12 @@ If the backend uses a similar \--import-marks file, this allows for
 incremental bidirectional exporting of the repository by keeping the
 marks the same across runs.
 
+--fake-missing-tagger::
+       Some old repositories have tags without a tagger.  The
+       fast-import protocol was pretty strict about that, and did not
+       allow that.  So fake a tagger to be able to fast-import the
+       output.
+
 
 EXAMPLES
 --------

diff --git a/builtin-fast-export.c b/builtin-fast-export.c
index 7d5d57ad7568b8c0bf7396cdbd581c67ab4600e2..838633808c3eb4891919aa397716f04fcd4cfe24 100644 (file)
--- a/builtin-fast-export.c
+++ b/builtin-fast-export.c
@@ -24,6 +24,7 @@ static const char *fast_export_usage[] = {
 
 static int progress;
 static enum { VERBATIM, WARN, STRIP, ABORT } signed_tag_mode = ABORT;
+static int fake_missing_tagger;
 
 static int parse_opt_signed_tag_mode(const struct option *opt,
                                     const char *arg, int unset)
@@ -297,10 +298,17 @@ static void handle_tag(const char *name, struct tag *tag)
                message_size = strlen(message);
        }
        tagger = memmem(buf, message ? message - buf : size, "\ntagger ", 8);
-       if (!tagger)
-               die ("No tagger for tag %s", sha1_to_hex(tag->object.sha1));
-       tagger++;
-       tagger_end = strchrnul(tagger, '\n');
+       if (!tagger) {
+               if (fake_missing_tagger)
+                       tagger = "tagger Unspecified Tagger "
+                               "<unspecified-tagger> 0 +0000";
+               else
+                       tagger = "";
+               tagger_end = tagger + strlen(tagger);
+       } else {
+               tagger++;
+               tagger_end = strchrnul(tagger, '\n');
+       }
 
        /* handle signed tags */
        if (message) {
@@ -326,9 +334,10 @@ static void handle_tag(const char *name, struct tag *tag)
 
        if (!prefixcmp(name, "refs/tags/"))
                name += 10;
-       printf("tag %s\nfrom :%d\n%.*s\ndata %d\n%.*s\n",
+       printf("tag %s\nfrom :%d\n%.*s%sdata %d\n%.*s\n",
               name, get_object_mark(tag->tagged),
               (int)(tagger_end - tagger), tagger,
+              tagger == tagger_end ? "" : "\n",
               (int)message_size, (int)message_size, message ? message : "");
 }
 
@@ -483,6 +492,8 @@ int cmd_fast_export(int argc, const char **argv, const char *prefix)
                             "Dump marks to this file"),
                OPT_STRING(0, "import-marks", &import_filename, "FILE",
                             "Import marks from this file"),
+               OPT_BOOLEAN(0, "fake-missing-tagger", &fake_missing_tagger,
+                            "Fake a tagger when tags lack one"),
                OPT_END()
        };
 

diff --git a/t/t9301-fast-export.sh b/t/t9301-fast-export.sh
index 638c858dc7b640fdff4af5902ed79c95e9d9d040..3a6509a1c87671ab92598fc971891100159c42d4 100755 (executable)
--- a/t/t9301-fast-export.sh
+++ b/t/t9301-fast-export.sh
@@ -239,4 +239,24 @@ test_expect_success 'fast-export | fast-import when master is tagged' '
 
 '
 
+cat > tag-content << EOF
+object $(git rev-parse HEAD)
+type commit
+tag rosten
+EOF
+
+test_expect_success 'cope with tagger-less tags' '
+
+       TAG=$(git hash-object -t tag -w tag-content) &&
+       git update-ref refs/tags/sonnenschein $TAG &&
+       git fast-export -C -C --signed-tags=strip --all > output &&
+       test $(grep -c "^tag " output) = 4 &&
+       ! grep "Unspecified Tagger" output &&
+       git fast-export -C -C --signed-tags=strip --all \
+               --fake-missing-tagger > output &&
+       test $(grep -c "^tag " output) = 4 &&
+       grep "Unspecified Tagger" output
+
+'
+
 test_done