Update the readconfig filename parsing to allow specifying an existing,
inherited, filedescriptor as 'fd:<n>'
This is useful when you want to pass potentially sensitive onfiguration data to
qemu without having it hit the filesystem/stable-storage
Signed-off-by: Ronnie Sahlberg <ronniesahlb...@gmail.com>
---
qemu-config.c | 15 +++++++++++++--
qemu-options.hx | 3 ++-
2 files changed, 15 insertions(+), 3 deletions(-)
diff --git a/qemu-config.c b/qemu-config.c
index b030205..c12c5eb 100644
--- a/qemu-config.c
+++ b/qemu-config.c
@@ -770,8 +770,19 @@ out:
int qemu_read_config_file(const char *filename)
{
- FILE *f = fopen(filename, "r");
- int ret;
+ FILE *f;
+ int ret, fd;
+
+ if (strncmp(filename, "fd:", 3)) {
+ f = fopen(filename, "r");
+ } else {
+ errno = 0;
+ fd = strtol(filename + 3, NULL, 10);
+ if (errno != 0) {
+ return -errno;
+ }
+ f = fdopen(fd, "r");
+ }
if (f == NULL) {
return -errno;
diff --git a/qemu-options.hx b/qemu-options.hx
index 3a07ae8..653ff2d 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -2577,7 +2577,8 @@ DEF("readconfig", HAS_ARG, QEMU_OPTION_readconfig,
STEXI
@item -readconfig @var{file}
@findex -readconfig
-Read device configuration from @var{file}.
+Read device configuration from @var{file}. Use 'fd:<n>' as filename
+to read from an existing, inherited, filedesriptor.
ETEXI
DEF("writeconfig", HAS_ARG, QEMU_OPTION_writeconfig,
"-writeconfig <file>\n"
--
1.7.3.1
