[PATCH 2/3] doc/fast-import: document feature import-marks-if-exists

[Dmitry Ivankov <divanorama@gmail.com>]

fast-import parameter --import-marks-if-exists was introduced in
commit dded4.. --import-marks can be set via a "feature" command in
a fast-import stream and --import-marks-if-exists has support for
such specification too, for free.

Document "feature import-marks-if-exists=<file>" command and add a
minimalistic test for it.

Signed-off-by: Dmitry Ivankov <divanorama@gmail.com>
---
 Documentation/git-fast-import.txt |    5 +++++
 t/t9300-fast-import.sh            |   15 +++++++++++++++
 2 files changed, 20 insertions(+), 0 deletions(-)

diff --git a/Documentation/git-fast-import.txt b/Documentation/git-fast-import.txt
index 3f5b912..bdcc81c 100644
--- a/Documentation/git-fast-import.txt
+++ b/Documentation/git-fast-import.txt
@@ -1005,6 +1005,11 @@ import-marks::
 	second, an --import-marks= command-line option overrides
 	any "feature import-marks" command in the stream.
 
+import-marks-if-exists::
+	Like import-marks but instead of erroring out, silently
+	skips the file if it does not exist. Differences from --
+	version are the same as with import-marks feature above.
+
 cat-blob::
 ls::
 	Require that the backend support the 'cat-blob' or 'ls' command.
diff --git a/t/t9300-fast-import.sh b/t/t9300-fast-import.sh
index 2a53640..eed57df 100755
--- a/t/t9300-fast-import.sh
+++ b/t/t9300-fast-import.sh
@@ -1882,6 +1882,21 @@ test_expect_success 'R: --import-marks-if-exists' '
 	test_cmp expect io.marks
 '
 
+test_expect_success 'R: feature import-marks-if-exists' '
+	rm -f io.marks &&
+	blob=$(echo hi | git hash-object --stdin) &&
+	echo ":1 $blob" >expect &&
+	git fast-import --import-marks-if-exists=io.marks --export-marks=io.marks <<-\EOF &&
+	feature import-marks-if-exists=io.marks
+	blob
+	mark :1
+	data 3
+	hi
+
+	EOF
+	test_cmp expect io.marks
+'
+
 cat >input << EOF
 feature import-marks=marks.out
 feature export-marks=marks.new
-- 
1.7.3.4