Re: [libvirt] [PATCH] storage: forbid rebuilding existing disk storage pools

which would blow away all volumes. Honor VIR_STORAGE_POOL_BUILD_OVERWRITE to force a rebuild. This was caught by libvirt-tck's storage/110-disk-pool.t. Cheers, -- Guido --- src/storage/storage_backend_disk.c | 72 ++++++++++++++++++++++++++++++++++-- 1 files changed, 68 insertions(+), 4 deletions(-) diff --git a/src/storage/storage_backend_disk.c b/src/storage/storage_backend_disk.c index 82d6e8a..995ad2f 100644 --- a/src/storage/storage_backend_disk.c +++ b/src/storage/storage_backend_disk.c @@ -335,6 +335,40 @@ virStorageBackendDiskRefreshPool(virConnectPtr conn ATTRIBUTE_UNUSED, /** + * Check for a valid disk label (partition table) on device + * + * return: 0 - valid disk label found + *>0 - no or unrecognized disk label + *<0 - error finding the disk label + */ +static int +virStorageBackendDiskFindLabel(const char* device) +{ + const char *const args[] = { + device, "print", "--script", NULL, + }; + virCommandPtr cmd = virCommandNew(PARTED); + char *output = NULL; + int ret = -1; + + virCommandAddArgSet(cmd, args); + virCommandAddEnvString(cmd, "LC_ALL=C"); + virCommandSetOutputBuffer(cmd,&output); + + /* if parted succeeds we have a valid partition table */ + ret = virCommandRun(cmd, NULL); + if (ret< 0) { + if (strstr (output, "unrecognised disk label")) + ret = 1; + } + + virCommandFree(cmd); + VIR_FREE(output); + return ret; +} + + +/** * Write a new partition table header */ static int @@ -342,6 +376,8 @@ virStorageBackendDiskBuildPool(virConnectPtr conn ATTRIBUTE_UNUSED, virStoragePoolObjPtr pool, unsigned int flags) { + bool ok_to_mklabel = false; + int ret = -1; /* eg parted /dev/sda mklabel msdos */ const char *prog[] = { PARTED, @@ -353,12 +389,40 @@ virStorageBackendDiskBuildPool(virConnectPtr conn ATTRIBUTE_UNUSED, NULL, }; - virCheckFlags(0, -1); + virCheckFlags(VIR_STORAGE_POOL_BUILD_OVERWRITE | + VIR_STORAGE_POOL_BUILD_NO_OVERWRITE, ret); - if (virRun(prog, NULL)< 0) - return -1; + if (flags == (VIR_STORAGE_POOL_BUILD_OVERWRITE | + VIR_STORAGE_POOL_BUILD_NO_OVERWRITE)) { + virStorageReportError(VIR_ERR_OPERATION_INVALID, + _("Overwrite and no overwrite flags" + " are mutually exclusive")); + goto error; + } - return 0; + if (flags& VIR_STORAGE_POOL_BUILD_OVERWRITE) + ok_to_mklabel = true; + else { + int check; + + check = virStorageBackendDiskFindLabel ( + pool->def->source.devices[0].path); + if (check> 0) { + ok_to_mklabel = true; + } else if (check< 0) { + virStorageReportError(VIR_ERR_OPERATION_FAILED, + _("Error checking for disk label")); + } else { + virStorageReportError(VIR_ERR_OPERATION_INVALID, + _("Disk label already present")); + } + } + + if (ok_to_mklabel) + ret = virRun(prog, NULL); + +error: + return ret; } /**