No interest in util-linux compatibility?
Am 23.09.2019 um 07:39 schrieb Joerg Vehlow:
From: Joerg Vehlow <[email protected]>
util-linux's losetup creates a loop device, if it is missing.
This is missing in busybox's implementation.
Testcase:
losetup /dev/loop1000 <somepath>
If /dev/loop1000 does not exist busybox give an error but
util-linux's losetup just creates the file
Signed-off-by: Joerg Vehlow <[email protected]>
---
util-linux/losetup.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/util-linux/losetup.c b/util-linux/losetup.c
index cc6c2b1d5..790c41cab 100644
--- a/util-linux/losetup.c
+++ b/util-linux/losetup.c
@@ -147,10 +147,25 @@ int losetup_main(int argc UNUSED_PARAM, char **argv)
d = *argv++;
if (argv[0]) {
+ struct stat statbuf;
+ int n;
unsigned flags = (opt & OPT_r) ?
BB_LO_FLAGS_READ_ONLY : 0;
+
if (opt & OPT_P) {
flags |= BB_LO_FLAGS_PARTSCAN;
}
+
+ // If the loop device does not exist, create it
+ if (stat(d, &statbuf) != 0 && errno == ENOENT) {
+ if (sscanf(d, LOOP_FORMAT, &n) != 1) {
+ errno = 0;
+ bb_perror_msg_and_die("Loop device
%s does not exist and does not start with " LOOP_NAME, d);
+ }
+ if (mknod(d, S_IFBLK|0644, makedev(7, n))
!= 0) {
+ bb_simple_perror_msg_and_die(d);
+ }
+ }
+
if (set_loop(&d, argv[0], offset, flags) < 0)
bb_simple_perror_msg_and_die(argv[0]);
return EXIT_SUCCESS;
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