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qemu: Don't change ownership of file when appending to it

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Saving domain to previously created file changes also its ownership.
This is certainly not what users want if some conditions are met:
it is a regular, local file and dynamic_ownership is off.
This commit is contained in:
Michal Privoznik 2011-05-24 14:36:08 +02:00
parent b43b6c2ad5
commit 764c282cdf
1 changed files with 11 additions and 1 deletions
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12
src/qemu/qemu_driver.c
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@ -1963,6 +1963,8 @@ static int qemudDomainSaveFlag(struct qemud_driver *driver, virDomainPtr dom,
bool is_reg = false;
unsigned long long offset;
int fd = -1;
uid_t uid = getuid();
gid_t gid = getgid();
memset(&header, 0, sizeof(header));
memcpy(header.magic, QEMUD_SAVE_MAGIC, sizeof(header.magic));
@ -2013,6 +2015,14 @@ static int qemudDomainSaveFlag(struct qemud_driver *driver, virDomainPtr dom,
is_reg = true;
} else {
is_reg = !!S_ISREG(sb.st_mode);
/* If the path is regular local file which exists
* already and dynamic_ownership is off, we don't
* want to change it's ownership, just open it as-is */
if (is_reg && !driver->dynamicOwnership &&
virStorageFileIsSharedFS(path) == 0) {
uid=sb.st_uid;
gid=sb.st_gid;
}
}
offset = sizeof(header) + header.xml_len;
@ -2048,7 +2058,7 @@ static int qemudDomainSaveFlag(struct qemud_driver *driver, virDomainPtr dom,
} else {
if ((fd = virFileOpenAs(path, O_CREAT|O_TRUNC|O_WRONLY,
S_IRUSR|S_IWUSR,
getuid(), getgid(), 0)) < 0) {
uid, gid, 0)) < 0) {
/* If we failed as root, and the error was permission-denied
(EACCES or EPERM), assume it's on a network-connected share
where root access is restricted (eg, root-squashed NFS). If the