Signed-off-by: Bert Wesarg <bert.wes...@googlemail.com>

--- 

ChangeLog:

v2:
 * squashed and base new tests on 'dl/format-patch-doc-test-cleanup'

Cc: Denton Liu <liu.den...@gmail.com>
---
 Documentation/config/format.txt    |  2 +-
 Documentation/git-format-patch.txt |  3 ++-
 builtin/log.c                      |  8 ++++++++
 t/t4014-format-patch.sh            | 20 ++++++++++++++++++++
 4 files changed, 31 insertions(+), 2 deletions(-)

diff --git a/Documentation/config/format.txt b/Documentation/config/format.txt
index cb629fa769..40cad9278f 100644
--- a/Documentation/config/format.txt
+++ b/Documentation/config/format.txt
@@ -81,7 +81,7 @@ format.coverLetter::
 
 format.outputDirectory::
        Set a custom directory to store the resulting files instead of the
-       current working directory.
+       current working directory. All directory components will be created.
 
 format.useAutoBase::
        A boolean value which lets you enable the `--base=auto` option of
diff --git a/Documentation/git-format-patch.txt 
b/Documentation/git-format-patch.txt
index 0ac56f4b70..2035d4d5d5 100644
--- a/Documentation/git-format-patch.txt
+++ b/Documentation/git-format-patch.txt
@@ -66,7 +66,8 @@ they are created in the current working directory. The 
default path
 can be set with the `format.outputDirectory` configuration option.
 The `-o` option takes precedence over `format.outputDirectory`.
 To store patches in the current working directory even when
-`format.outputDirectory` points elsewhere, use `-o .`.
+`format.outputDirectory` points elsewhere, use `-o .`. All directory
+components will be created.
 
 By default, the subject of a single patch is "[PATCH] " followed by
 the concatenation of lines from the commit message up to the first blank
diff --git a/builtin/log.c b/builtin/log.c
index c4b35fdaf9..294534aacb 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -1770,6 +1770,14 @@ int cmd_format_patch(int argc, const char **argv, const 
char *prefix)
                        rev.diffopt.use_color = GIT_COLOR_NEVER;
                if (use_stdout)
                        die(_("standard output, or directory, which one?"));
+               switch 
(safe_create_leading_directories_const(output_directory)) {
+               case SCLD_OK:
+               case SCLD_EXISTS:
+                       break;
+               default:
+                       die(_("could not create leading directories "
+                             "of '%s'"), output_directory);
+               }
                if (mkdir(output_directory, 0777) < 0 && errno != EEXIST)
                        die_errno(_("could not create directory '%s'"),
                                  output_directory);
diff --git a/t/t4014-format-patch.sh b/t/t4014-format-patch.sh
index 83f52614d3..2f2cd6fea6 100755
--- a/t/t4014-format-patch.sh
+++ b/t/t4014-format-patch.sh
@@ -1606,6 +1606,26 @@ test_expect_success 'From line has expected format' '
        test_cmp from filtered
 '
 
+test_expect_success 'format-patch -o with no leading directories' '
+       rm -fr patches &&
+       git format-patch -o patches master..side &&
+       git rev-list master..side >list &&
+       test_line_count = $(ls patches | wc -l) list
+'
+
+test_expect_success 'format-patch -o with leading existing directories' '
+       git format-patch -o patches/side master..side &&
+       git rev-list master..side >list &&
+       test_line_count = $(ls patches/side | wc -l) list
+'
+
+test_expect_success 'format-patch -o with leading non-existing directories' '
+       rm -fr patches &&
+       git format-patch -o patches/side master..side &&
+       git rev-list master..side >list &&
+       test_line_count = $(ls patches/side | wc -l) list
+'
+
 test_expect_success 'format-patch format.outputDirectory option' '
        test_config format.outputDirectory patches &&
        rm -fr patches &&
-- 
2.23.0.11.g242cf7f110

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