When we read from a trailer.*.command sub-program, the
current code uses run_command followed by a pipe read, which
can result in deadlock (though in practice you would have to
have a large trailer for this to be a problem). The current
code also leaks the file descriptor for the pipe to the
sub-command.
Instead, let's use capture_command, which makes this simpler
(and we can get rid of our custom helper).
Signed-off-by: Jeff King <peff@xxxxxxxx>
---
trailer.c | 18 +++++-------------
1 file changed, 5 insertions(+), 13 deletions(-)
diff --git a/trailer.c b/trailer.c
index 05b3859..4b14a56 100644
--- a/trailer.c
+++ b/trailer.c
@@ -214,16 +214,6 @@ static struct trailer_item *remove_first(struct trailer_item **first)
return item;
}
-static int read_from_command(struct child_process *cp, struct strbuf *buf)
-{
- if (run_command(cp))
- return error("running trailer command '%s' failed", cp->argv[0]);
- if (strbuf_read(buf, cp->out, 1024) < 1)
- return error("reading from trailer command '%s' failed", cp->argv[0]);
- strbuf_trim(buf);
- return 0;
-}
-
static const char *apply_command(const char *command, const char *arg)
{
struct strbuf cmd = STRBUF_INIT;
@@ -240,14 +230,16 @@ static const char *apply_command(const char *command, const char *arg)
cp.argv = argv;
cp.env = local_repo_env;
cp.no_stdin = 1;
- cp.out = -1;
cp.use_shell = 1;
- if (read_from_command(&cp, &buf)) {
+ if (capture_command(&cp, &buf, 1024)) {
+ error("running trailer command '%s' failed", cmd.buf);
strbuf_release(&buf);
result = xstrdup("");
- } else
+ } else {
+ strbuf_trim(&buf);
result = strbuf_detach(&buf, NULL);
+ }
strbuf_release(&cmd);
return result;
--
2.3.3.618.ga041503
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