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fast-export: do automatic reencoding of commit messages only if requested
Automatic re-encoding of commit messages (and dropping of the encoding header) hurts attempts to do reversible history rewrites (e.g. sha1sum <-> sha256sum transitions, some subtree rewrites), and seems inconsistent with the general principle followed elsewhere in fast-export of requiring explicit user requests to modify the output (e.g. --signed-tags=strip, --tag-of-filtered-object=rewrite). Add a --reencode flag that the user can use to specify, and like other fast-export flags, default it to 'abort'. Signed-off-by: Elijah Newren <newren@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Elijah Newren
Junio C Hamano
parent
57a8be2cb0
commit
e80001f8fd
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@ -129,6 +129,13 @@ marks the same across runs.
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for intermediary filters (e.g. for rewriting commit messages
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which refer to older commits, or for stripping blobs by id).
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--reencode=(yes|no|abort)::
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Specify how to handle `encoding` header in commit objects. When
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asking to 'abort' (which is the default), this program will die
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when encountering such a commit object. With 'yes', the commit
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message will be reencoded into UTF-8. With 'no', the original
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encoding will be preserved.
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--refspec::
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Apply the specified refspec to each ref exported. Multiple of them can
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be specified.
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@ -33,6 +33,7 @@ static const char *fast_export_usage[] = {
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static int progress;
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static enum { SIGNED_TAG_ABORT, VERBATIM, WARN, WARN_STRIP, STRIP } signed_tag_mode = SIGNED_TAG_ABORT;
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static enum { TAG_FILTERING_ABORT, DROP, REWRITE } tag_of_filtered_mode = TAG_FILTERING_ABORT;
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static enum { REENCODE_ABORT, REENCODE_YES, REENCODE_NO } reencode_mode = REENCODE_ABORT;
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static int fake_missing_tagger;
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static int use_done_feature;
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static int no_data;
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@ -77,6 +78,31 @@ static int parse_opt_tag_of_filtered_mode(const struct option *opt,
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return 0;
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}
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static int parse_opt_reencode_mode(const struct option *opt,
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const char *arg, int unset)
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{
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if (unset) {
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reencode_mode = REENCODE_ABORT;
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return 0;
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}
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switch (git_parse_maybe_bool(arg)) {
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case 0:
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reencode_mode = REENCODE_NO;
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break;
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case 1:
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reencode_mode = REENCODE_YES;
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break;
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default:
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if (!strcasecmp(arg, "abort"))
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reencode_mode = REENCODE_ABORT;
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else
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return error("Unknown reencoding mode: %s", arg);
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}
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return 0;
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}
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static struct decoration idnums;
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static uint32_t last_idnum;
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@ -633,10 +659,21 @@ static void handle_commit(struct commit *commit, struct rev_info *rev,
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}
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mark_next_object(&commit->object);
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if (anonymize)
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if (anonymize) {
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reencoded = anonymize_commit_message(message);
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else if (!is_encoding_utf8(encoding))
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reencoded = reencode_string(message, "UTF-8", encoding);
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} else if (encoding) {
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switch(reencode_mode) {
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case REENCODE_YES:
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reencoded = reencode_string(message, "UTF-8", encoding);
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break;
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case REENCODE_NO:
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break;
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case REENCODE_ABORT:
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die("Encountered commit-specific encoding %s in commit "
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"%s; use --reencode=[yes|no] to handle it",
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encoding, oid_to_hex(&commit->object.oid));
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}
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}
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if (!commit->parents)
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printf("reset %s\n", refname);
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printf("commit %s\nmark :%"PRIu32"\n", refname, last_idnum);
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@ -1091,6 +1128,9 @@ int cmd_fast_export(int argc, const char **argv, const char *prefix)
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OPT_CALLBACK(0, "tag-of-filtered-object", &tag_of_filtered_mode, N_("mode"),
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N_("select handling of tags that tag filtered objects"),
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parse_opt_tag_of_filtered_mode),
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OPT_CALLBACK(0, "reencode", &reencode_mode, N_("mode"),
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N_("select handling of commit messages in an alternate encoding"),
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parse_opt_reencode_mode),
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OPT_STRING(0, "export-marks", &export_filename, N_("file"),
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N_("Dump marks to this file")),
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OPT_STRING(0, "import-marks", &import_filename, N_("file"),
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@ -94,14 +94,14 @@ test_expect_success 'fast-export --show-original-ids | git fast-import' '
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test $MUSS = $(git rev-parse --verify refs/tags/muss)
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'
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test_expect_success 'iso-8859-7' '
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test_expect_success 'reencoding iso-8859-7' '
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test_when_finished "git reset --hard HEAD~1" &&
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test_config i18n.commitencoding iso-8859-7 &&
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test_tick &&
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echo rosten >file &&
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git commit -s -F "$TEST_DIRECTORY/t9350/simple-iso-8859-7-commit-message.txt" file &&
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git fast-export wer^..wer >iso-8859-7.fi &&
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git fast-export --reencode=yes wer^..wer >iso-8859-7.fi &&
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sed "s/wer/i18n/" iso-8859-7.fi |
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(cd new &&
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git fast-import &&
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@ -118,13 +118,45 @@ test_expect_success 'iso-8859-7' '
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! grep ^encoding actual)
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'
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test_expect_success 'aborting on iso-8859-7' '
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test_when_finished "git reset --hard HEAD~1" &&
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test_config i18n.commitencoding iso-8859-7 &&
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echo rosten >file &&
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git commit -s -F "$TEST_DIRECTORY/t9350/simple-iso-8859-7-commit-message.txt" file &&
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test_must_fail git fast-export --reencode=abort wer^..wer >iso-8859-7.fi
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'
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test_expect_success 'preserving iso-8859-7' '
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test_when_finished "git reset --hard HEAD~1" &&
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test_config i18n.commitencoding iso-8859-7 &&
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echo rosten >file &&
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git commit -s -F "$TEST_DIRECTORY/t9350/simple-iso-8859-7-commit-message.txt" file &&
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git fast-export --reencode=no wer^..wer >iso-8859-7.fi &&
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sed "s/wer/i18n-no-recoding/" iso-8859-7.fi |
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(cd new &&
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git fast-import &&
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# The commit object, if not re-encoded, is 240 bytes.
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# Removing the "encoding iso-8859-7\n" header would drops 20
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# bytes. Re-encoding the Pi character from \xF0 (\360) in
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# iso-8859-7 to \xCF\x80 (\317\200) in UTF-8 adds a byte.
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# Check for the expected size...
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test 240 -eq "$(git cat-file -s i18n-no-recoding)" &&
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# ...as well as the expected byte.
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git cat-file commit i18n-no-recoding >actual &&
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grep $(printf "\360") actual &&
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# Also make sure the commit has the "encoding" header
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grep ^encoding actual)
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'
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test_expect_success 'encoding preserved if reencoding fails' '
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test_when_finished "git reset --hard HEAD~1" &&
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test_config i18n.commitencoding iso-8859-7 &&
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echo rosten >file &&
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git commit -s -F "$TEST_DIRECTORY/t9350/broken-iso-8859-7-commit-message.txt" file &&
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git fast-export wer^..wer >iso-8859-7.fi &&
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git fast-export --reencode=yes wer^..wer >iso-8859-7.fi &&
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sed "s/wer/i18n-invalid/" iso-8859-7.fi |
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(cd new &&
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git fast-import &&
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