Added feature that allows a signature file to be used with format-patch.

  $ git format-patch --signature-file ~/.signature -1

Now signatures with newlines and other special characters can be
easily included.

Signed-off-by: Jeremiah Mahler <jmmah...@gmail.com>
---
 Documentation/git-format-patch.txt |  7 +++++++
 builtin/log.c                      | 24 ++++++++++++++++++++++++
 t/t4014-format-patch.sh            | 13 +++++++++++++
 3 files changed, 44 insertions(+)

diff --git a/Documentation/git-format-patch.txt 
b/Documentation/git-format-patch.txt
index 5c0a4ab..dd57841 100644
--- a/Documentation/git-format-patch.txt
+++ b/Documentation/git-format-patch.txt
@@ -14,6 +14,7 @@ SYNOPSIS
                   [(--attach|--inline)[=<boundary>] | --no-attach]
                   [-s | --signoff]
                   [--signature=<signature> | --no-signature]
+                  [--signature-file=<file>]
                   [-n | --numbered | -N | --no-numbered]
                   [--start-number <n>] [--numbered-files]
                   [--in-reply-to=Message-Id] [--suffix=.<sfx>]
@@ -233,6 +234,12 @@ configuration options in linkgit:git-notes[1] to use this 
workflow).
        signature option is omitted the signature defaults to the Git version
        number.
 
+--signature-file=<file>::
+       Add a signature, by including the contents of a file, to each message
+       produced. Per RFC 3676 the signature is separated from the body by a
+       line with '-- ' on it. If the signature option is omitted the signature
+       defaults to the Git version number.
+
 --suffix=.<sfx>::
        Instead of using `.patch` as the suffix for generated
        filenames, use specified suffix.  A common alternative is
diff --git a/builtin/log.c b/builtin/log.c
index 39e8836..4a7308d 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -1147,6 +1147,27 @@ static int from_callback(const struct option *opt, const 
char *arg, int unset)
        return 0;
 }
 
+static int signature_file_callback(const struct option *opt, const char *arg,
+                                                       int unset)
+{
+       const char **signature = opt->value;
+       static char buf[1024];
+       size_t sz;
+       FILE *fd;
+
+       fd = fopen(arg, "r");
+       if (fd) {
+               sz = sizeof(buf);
+               sz = fread(buf, 1, sz - 1, fd);
+               if (sz) {
+                       buf[sz] = '\0';
+                       *signature = buf;
+               }
+               fclose(fd);
+       }
+       return 0;
+}
+
 int cmd_format_patch(int argc, const char **argv, const char *prefix)
 {
        struct commit *commit;
@@ -1230,6 +1251,9 @@ int cmd_format_patch(int argc, const char **argv, const 
char *prefix)
                            PARSE_OPT_OPTARG, thread_callback },
                OPT_STRING(0, "signature", &signature, N_("signature"),
                            N_("add a signature")),
+               { OPTION_CALLBACK, 0, "signature-file", &signature, 
N_("signature-file"),
+                               N_("add a signature from contents of a file"),
+                           PARSE_OPT_NONEG, signature_file_callback },
                OPT__QUIET(&quiet, N_("don't print the patch filenames")),
                OPT_END()
        };
diff --git a/t/t4014-format-patch.sh b/t/t4014-format-patch.sh
index 9c80633..19b67e3 100755
--- a/t/t4014-format-patch.sh
+++ b/t/t4014-format-patch.sh
@@ -762,6 +762,19 @@ test_expect_success 'format-patch --signature="" 
suppresses signatures' '
        ! grep "^-- \$" output
 '
 
+cat > expect << EOF
+Test User <test.em...@kernel.org>
+http://git.kernel.org/cgit/git/git.git
+git.kernel.org/?p=git/git.git;a=summary
+EOF
+
+test_expect_success 'format-patch --signature-file file' '
+       git format-patch --stdout --signature-file expect -1 >output &&
+       check_patch output &&
+       fgrep -x -f output expect >output2 &&
+       diff expect output2
+'
+
 test_expect_success TTY 'format-patch --stdout paginates' '
        rm -f pager_used &&
        test_terminal env GIT_PAGER="wc >pager_used" git format-patch --stdout 
--all &&
-- 
Jeremiah Mahler
jmmah...@gmail.com
http://github.com/jmahler


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