filter_buffer_or_fd(): ignore EPIPE

We are explicitly ignoring SIGPIPE, as we fully expect that the
filter program may not read our output fully.  Ignore EPIPE that
may come from writing to it as well.

A new test was stolen from Jeff's suggestion.

Helped-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/convert.c b/convert.c
index 9a5612e93da2058f64bcec20cfd474a8b6b2d223..f3bd3e93fb2ecf95413db3c53d7e686cd03d1e69 100644 (file)
--- a/convert.c
+++ b/convert.c
@@ -356,9 +356,14 @@ static int filter_buffer_or_fd(int in, int out, void *data)
        sigchain_push(SIGPIPE, SIG_IGN);
 
        if (params->src) {
-               write_err = (write_in_full(child_process.in, params->src, params->size) < 0);
+               write_err = (write_in_full(child_process.in,
+                                          params->src, params->size) < 0);
+               if (errno == EPIPE)
+                       write_err = 0;
        } else {
                write_err = copy_fd(params->fd, child_process.in);
+               if (write_err == COPY_WRITE_ERROR && errno == EPIPE)
+                       write_err = 0;
        }
 
        if (close(child_process.in))

diff --git a/t/t0021-conversion.sh b/t/t0021-conversion.sh
index ca7d2a630a8442d8812b444708d6f28f2e45fb32..e0200b9f338f0478fd55029eab9c32c6b7956476 100755 (executable)
--- a/t/t0021-conversion.sh
+++ b/t/t0021-conversion.sh
@@ -204,6 +204,16 @@ test_expect_success 'filtering large input to small output should use little mem
        GIT_MMAP_LIMIT=1m GIT_ALLOC_LIMIT=1m git add 30MB
 '
 
+test_expect_success 'filter that does not read is fine' '
+       test-genrandom foo $((128 * 1024 + 1)) >big &&
+       echo "big filter=epipe" >.gitattributes &&
+       git config filter.epipe.clean "echo xyzzy" &&
+       git add big &&
+       git cat-file blob :big >actual &&
+       echo xyzzy >expect &&
+       test_cmp expect actual
+'
+
 test_expect_success EXPENSIVE 'filter large file' '
        git config filter.largefile.smudge cat &&
        git config filter.largefile.clean cat &&