gen_init_cpio: Ignore fsync() returning EINVAL on pipes
The reproducer:
echo | ./usr/gen_init_cpio /dev/stdin > /dev/null
fsync() on a pipe fd returns -EINVAL, which makes gen_init_cpio fail.
Ignore -EINVAL from fsync().
Fixes: ae18b94099b0 ("gen_init_cpio: support -o <output_file> parameter")
Cc: David Disseldorp <ddiss@suse.de>
Cc: Nicolas Schier <nsc@kernel.org>
Signed-off-by: Dmitry Safonov <dima@arista.com>
Reviewed-by: David Disseldorp <ddiss@suse.de>
Link: https://patch.msgid.link/20251007-gen_init_cpio-pipe-v2-1-b098ab94b58a@arista.com
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
diff --git a/usr/gen_init_cpio.c b/usr/gen_init_cpio.c
index 75e9561..b7296ed 100644
--- a/usr/gen_init_cpio.c
+++ b/usr/gen_init_cpio.c
@@ -112,7 +112,10 @@ static int cpio_trailer(void)
push_pad(padlen(offset, 512)) < 0)
return -1;
- return fsync(outfd);
+ if (fsync(outfd) < 0 && errno != EINVAL)
+ return -1;
+
+ return 0;
}
static int cpio_mkslink(const char *name, const char *target,
