[PATCH v2 0/5] Fix and extend encoding handling in fast export/import

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While stress testing `git filter-repo`, I noticed an issue with
encoding; further digging led to the fixes and features in this series.
See the individual commit messages for details.

Changes since v1 (full range-diff below):
  * Applied style fixes Eric pointed out in his review (thanks!)
  * Rebased on latest master (83232e38, "The seventh batch"), resolving
    a trivial merge conflict.  Now merges cleanly with next and pu as
    well.

I'm a bit under the weather so I may be slow to respond...

Elijah Newren (5):
  t9350: fix encoding test to actually test reencoding
  fast-import: support 'encoding' commit header
  fast-export: avoid stripping encoding header if we cannot reencode
  fast-export: differentiate between explicitly utf-8 and implicitly
    utf-8
  fast-export: do automatic reencoding of commit messages only if
    requested

 Documentation/git-fast-import.txt |  7 ++++
 builtin/fast-export.c             | 44 +++++++++++++++++++++----
 fast-import.c                     | 11 +++++--
 t/t9300-fast-import.sh            | 20 ++++++++++++
 t/t9350-fast-export.sh            | 53 +++++++++++++++++++++++++------
 5 files changed, 118 insertions(+), 17 deletions(-)

Range-diff:
1:  d6efd05142 ! 1:  9cc04242bd t9350: fix encoding test to actually test reencoding
    @@ -26,8 +26,7 @@
     -	# use author and committer name in ISO-8859-1 to match it.
     -	. "$TEST_DIRECTORY"/t3901/8859-1.txt &&
     +	test_when_finished "git reset --hard HEAD~1" &&
    -+	test_when_finished "git config --unset i18n.commitencoding" &&
    -+	git config i18n.commitencoding iso-8859-7 &&
    ++	test_config i18n.commitencoding iso-8859-7 &&
      	test_tick &&
      	echo rosten >file &&
     -	git commit -s -m den file &&
2:  02f48c7559 ! 2:  0cd023ac7a fast-import: support 'encoding' commit header
    @@ -51,9 +51,8 @@
      	}
      	if (!committer)
      		die("Expected committer but didn't get one");
    -+	if (skip_prefix(command_buf.buf, "encoding ", &encoding)) {
    ++	if (skip_prefix(command_buf.buf, "encoding ", &encoding))
     +		read_next_command();
    -+	}
      	parse_data(&msg, 0, NULL);
      	read_next_command();
      	parse_from(b);
    @@ -69,7 +68,7 @@
     +		strbuf_addf(&new_data,
     +			"encoding %s\n",
     +			encoding);
    -+	strbuf_addf(&new_data, "\n");
    ++	strbuf_addch(&new_data, '\n');
      	strbuf_addbuf(&new_data, &msg);
      	free(author);
      	free(committer);
    @@ -78,14 +77,14 @@
      --- a/t/t9300-fast-import.sh
      +++ b/t/t9300-fast-import.sh
     @@
    - 	background_import_still_running
    + 	sed -e s/LFs/LLL/ W-input | tr L "\n" | test_must_fail git fast-import
      '
      
     +###
    -+### series W (other new features)
    ++### series X (other new features)
     +###
     +
    -+test_expect_success 'W: handling encoding' '
    ++test_expect_success 'X: handling encoding' '
     +	test_tick &&
     +	cat >input <<-INPUT_END &&
     +	commit refs/heads/encoding
3:  86c348402d ! 3:  1fddf51402 fast-export: avoid stripping encoding header if we cannot reencode
    @@ -41,8 +41,7 @@
     +test_expect_success 'encoding preserved if reencoding fails' '
     +
     +	test_when_finished "git reset --hard HEAD~1" &&
    -+	test_when_finished "git config --unset i18n.commitencoding" &&
    -+	git config i18n.commitencoding iso-8859-7 &&
    ++	test_config i18n.commitencoding iso-8859-7 &&
     +	echo rosten >file &&
     +	git commit -s -m "$(printf "Pi: \360; Invalid: \377")" file &&
     +	git fast-export wer^..wer >iso-8859-7.fi &&
4:  c09b23bc59 = 4:  4a2e04b3ae fast-export: differentiate between explicitly utf-8 and implicitly utf-8
5:  24b69a0db9 ! 5:  44aacb1a0b fast-export: do automatic reencoding of commit messages only if requested
    @@ -92,8 +92,7 @@
     +test_expect_success 'reencoding iso-8859-7' '
      
      	test_when_finished "git reset --hard HEAD~1" &&
    - 	test_when_finished "git config --unset i18n.commitencoding" &&
    -@@
    + 	test_config i18n.commitencoding iso-8859-7 &&
      	test_tick &&
      	echo rosten >file &&
      	git commit -s -m "$(printf "Pi: \360")" file &&
    @@ -109,8 +108,7 @@
     +test_expect_success 'aborting on iso-8859-7' '
     +
     +	test_when_finished "git reset --hard HEAD~1" &&
    -+	test_when_finished "git config --unset i18n.commitencoding" &&
    -+	git config i18n.commitencoding iso-8859-7 &&
    ++	test_config i18n.commitencoding iso-8859-7 &&
     +	echo rosten >file &&
     +	git commit -s -m "$(printf "Pi: \360")" file &&
     +	test_must_fail git fast-export --reencode=abort wer^..wer >iso-8859-7.fi
    @@ -119,8 +117,7 @@
     +test_expect_success 'preserving iso-8859-7' '
     +
     +	test_when_finished "git reset --hard HEAD~1" &&
    -+	test_when_finished "git config --unset i18n.commitencoding" &&
    -+	git config i18n.commitencoding iso-8859-7 &&
    ++	test_config i18n.commitencoding iso-8859-7 &&
     +	echo rosten >file &&
     +	git commit -s -m "$(printf "Pi: \360")" file &&
     +	git fast-export --reencode=no wer^..wer >iso-8859-7.fi &&
    @@ -134,8 +131,7 @@
      test_expect_success 'encoding preserved if reencoding fails' '
      
      	test_when_finished "git reset --hard HEAD~1" &&
    -@@
    - 	git config i18n.commitencoding iso-8859-7 &&
    + 	test_config i18n.commitencoding iso-8859-7 &&
      	echo rosten >file &&
      	git commit -s -m "$(printf "Pi: \360; Invalid: \377")" file &&
     -	git fast-export wer^..wer >iso-8859-7.fi &&
-- 
2.21.0.782.g44aacb1a0b




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