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storage: Fix storage_backend probing when PARTED not installed.
Commit id 'a48c674f' caused problems for systems without PARTED installed. So move the PARTED probing code back to storage_backend_disk.c and create a shim within storage_backend.c to call it if WITH_STORAGE_DISK is true; otherwise, just return -1 with the error.
This commit is contained in:
John Ferlan
parent
cb38b6cbc7
commit
bdd371c5c5
@ -2851,157 +2851,30 @@ virStorageBackendBLKIDFindEmpty(const char *device ATTRIBUTE_UNUSED,
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#endif /* #if WITH_BLKID */
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typedef enum {
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VIR_STORAGE_PARTED_ERROR = -1,
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VIR_STORAGE_PARTED_MATCH, /* Valid label found and matches format */
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VIR_STORAGE_PARTED_DIFFERENT, /* Valid label found but not match format */
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VIR_STORAGE_PARTED_UNKNOWN, /* No or unrecognized label */
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VIR_STORAGE_PARTED_NOPTTYPE, /* Did not find the Partition Table type */
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VIR_STORAGE_PARTED_PTTYPE_UNK, /* Partition Table type unknown*/
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} virStorageBackendPARTEDResult;
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#if WITH_STORAGE_DISK
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/**
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* Check for a valid disk label (partition table) on device using
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* the PARTED command
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*
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* returns virStorageBackendPARTEDResult
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*/
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static virStorageBackendPARTEDResult
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virStorageBackendPARTEDFindLabel(const char *device,
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const char *format)
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{
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const char *const args[] = {
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device, "print", "--script", NULL,
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};
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virCommandPtr cmd = virCommandNew(PARTED);
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char *output = NULL;
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char *error = NULL;
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char *start, *end;
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int ret = VIR_STORAGE_PARTED_ERROR;
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virCommandAddArgSet(cmd, args);
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virCommandAddEnvString(cmd, "LC_ALL=C");
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virCommandSetOutputBuffer(cmd, &output);
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virCommandSetErrorBuffer(cmd, &error);
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/* if parted succeeds we have a valid partition table */
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ret = virCommandRun(cmd, NULL);
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if (ret < 0) {
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if ((output && strstr(output, "unrecognised disk label")) ||
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(error && strstr(error, "unrecognised disk label"))) {
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ret = VIR_STORAGE_PARTED_UNKNOWN;
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}
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goto cleanup;
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}
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/* Search for "Partition Table:" in the output. If not present,
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* then we cannot validate the partition table type.
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*/
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if (!(start = strstr(output, "Partition Table: ")) ||
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!(end = strstr(start, "\n"))) {
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VIR_DEBUG("Unable to find tag in output: %s", output);
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ret = VIR_STORAGE_PARTED_NOPTTYPE;
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goto cleanup;
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}
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start += strlen("Partition Table: ");
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*end = '\0';
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/* on disk it's "msdos", but we document/use "dos" so deal with it here */
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if (STREQ(start, "msdos"))
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start += 2;
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/* Make sure we know about this type */
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if (virStoragePoolFormatDiskTypeFromString(start) < 0) {
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ret = VIR_STORAGE_PARTED_PTTYPE_UNK;
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goto cleanup;
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}
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/* Does the on disk match what the pool desired? */
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if (STREQ(start, format))
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ret = VIR_STORAGE_PARTED_MATCH;
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ret = VIR_STORAGE_PARTED_DIFFERENT;
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cleanup:
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virCommandFree(cmd);
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VIR_FREE(output);
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VIR_FREE(error);
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return ret;
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}
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/**
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* Determine whether the label on the disk is valid or in a known format
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* for the purpose of rewriting the label during build or being able to
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* start a pool on a device.
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*
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* When 'writelabel' is true, if we find a valid disk label on the device,
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* then we shouldn't be attempting to write as the volume may contain
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* data. Force the usage of the overwrite flag to the build command in
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* order to be certain. When the disk label is unrecognized, then it
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* should be safe to write.
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*
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* When 'writelabel' is false, only if we find a valid disk label on the
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* device should we allow the start since for this path we won't be
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* rewriting the label.
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*
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* Return: 0 if it's OK
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* -1 if something's wrong
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*/
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static int
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virStorageBackendPARTEDValidLabel(const char *device,
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const char *format,
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bool writelabel)
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{
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int ret = -1;
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virStorageBackendPARTEDResult check;
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check = virStorageBackendPARTEDFindLabel(device, format);
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switch (check) {
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case VIR_STORAGE_PARTED_ERROR:
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virReportError(VIR_ERR_OPERATION_FAILED, "%s",
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_("Error checking for disk label, failed to get "
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"disk partition information"));
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break;
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case VIR_STORAGE_PARTED_MATCH:
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if (writelabel)
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virReportError(VIR_ERR_OPERATION_INVALID,
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_("Disk label already formatted using '%s'"),
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format);
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else
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ret = 0;
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break;
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case VIR_STORAGE_PARTED_DIFFERENT:
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virReportError(VIR_ERR_OPERATION_FAILED, "%s",
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_("Known, but different label format present, "
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"requires build --overwrite"));
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break;
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case VIR_STORAGE_PARTED_UNKNOWN:
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if (writelabel)
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ret = 0;
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else
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virReportError(VIR_ERR_OPERATION_FAILED, "%s",
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_("Unrecognized disk label found, requires build"));
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break;
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case VIR_STORAGE_PARTED_NOPTTYPE:
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virReportError(VIR_ERR_OPERATION_FAILED, "%s",
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_("Unable to determine Partition Type, "
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"requires build --overwrite"));
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break;
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case VIR_STORAGE_PARTED_PTTYPE_UNK:
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virReportError(VIR_ERR_OPERATION_FAILED, "%s",
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_("Unknown Partition Type, requires build --overwrite"));
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break;
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}
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return ret;
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return virStorageBackendDiskValidLabel(device, format, writelabel);
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}
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#else
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static int
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virStorageBackendPARTEDValidLabel(const char *device ATTRIBUTE_UNUSED,
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const char *format ATTRIBUTE_UNUSED,
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bool writelabel ATTRIBUTE_UNUSED)
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{
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virReportError(VIR_ERR_OPERATION_INVALID, "%s",
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_("PARTED is unsupported by this build"));
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return -1;
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}
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#endif /* #if WITH_STORAGE_DISK */
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/* virStorageBackendDeviceIsEmpty:
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* @devpath: Path to the device to check
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@ -418,6 +418,158 @@ virStorageBackendDiskRefreshPool(virConnectPtr conn ATTRIBUTE_UNUSED,
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}
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typedef enum {
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VIR_STORAGE_PARTED_ERROR = -1,
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VIR_STORAGE_PARTED_MATCH, /* Valid label found and matches format */
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VIR_STORAGE_PARTED_DIFFERENT, /* Valid label found but not match format */
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VIR_STORAGE_PARTED_UNKNOWN, /* No or unrecognized label */
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VIR_STORAGE_PARTED_NOPTTYPE, /* Did not find the Partition Table type */
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VIR_STORAGE_PARTED_PTTYPE_UNK, /* Partition Table type unknown*/
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} virStorageBackendPARTEDResult;
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/**
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* Check for a valid disk label (partition table) on device using
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* the PARTED command
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*
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* returns virStorageBackendPARTEDResult
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*/
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static virStorageBackendPARTEDResult
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virStorageBackendPARTEDFindLabel(const char *device,
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const char *format)
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{
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const char *const args[] = {
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device, "print", "--script", NULL,
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};
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virCommandPtr cmd = virCommandNew(PARTED);
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char *output = NULL;
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char *error = NULL;
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char *start, *end;
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int ret = VIR_STORAGE_PARTED_ERROR;
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virCommandAddArgSet(cmd, args);
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virCommandAddEnvString(cmd, "LC_ALL=C");
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virCommandSetOutputBuffer(cmd, &output);
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virCommandSetErrorBuffer(cmd, &error);
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/* if parted succeeds we have a valid partition table */
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ret = virCommandRun(cmd, NULL);
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if (ret < 0) {
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if ((output && strstr(output, "unrecognised disk label")) ||
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(error && strstr(error, "unrecognised disk label"))) {
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ret = VIR_STORAGE_PARTED_UNKNOWN;
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}
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goto cleanup;
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}
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/* Search for "Partition Table:" in the output. If not present,
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* then we cannot validate the partition table type.
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*/
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if (!(start = strstr(output, "Partition Table: ")) ||
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!(end = strstr(start, "\n"))) {
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VIR_DEBUG("Unable to find tag in output: %s", output);
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ret = VIR_STORAGE_PARTED_NOPTTYPE;
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goto cleanup;
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}
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start += strlen("Partition Table: ");
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*end = '\0';
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/* on disk it's "msdos", but we document/use "dos" so deal with it here */
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if (STREQ(start, "msdos"))
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start += 2;
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/* Make sure we know about this type */
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if (virStoragePoolFormatDiskTypeFromString(start) < 0) {
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ret = VIR_STORAGE_PARTED_PTTYPE_UNK;
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goto cleanup;
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}
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/* Does the on disk match what the pool desired? */
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if (STREQ(start, format))
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ret = VIR_STORAGE_PARTED_MATCH;
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ret = VIR_STORAGE_PARTED_DIFFERENT;
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cleanup:
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virCommandFree(cmd);
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VIR_FREE(output);
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VIR_FREE(error);
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return ret;
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}
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/**
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* Determine whether the label on the disk is valid or in a known format
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* for the purpose of rewriting the label during build or being able to
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* start a pool on a device.
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*
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* When 'writelabel' is true, if we find a valid disk label on the device,
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* then we shouldn't be attempting to write as the volume may contain
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* data. Force the usage of the overwrite flag to the build command in
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* order to be certain. When the disk label is unrecognized, then it
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* should be safe to write.
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*
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* When 'writelabel' is false, only if we find a valid disk label on the
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* device should we allow the start since for this path we won't be
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* rewriting the label.
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*
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* Return: 0 if it's OK
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* -1 if something's wrong
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*/
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int
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virStorageBackendDiskValidLabel(const char *device,
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const char *format,
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bool writelabel)
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{
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int ret = -1;
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virStorageBackendPARTEDResult check;
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check = virStorageBackendPARTEDFindLabel(device, format);
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switch (check) {
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case VIR_STORAGE_PARTED_ERROR:
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virReportError(VIR_ERR_OPERATION_FAILED, "%s",
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_("Error checking for disk label, failed to get "
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"disk partition information"));
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break;
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case VIR_STORAGE_PARTED_MATCH:
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if (writelabel)
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virReportError(VIR_ERR_OPERATION_INVALID,
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_("Disk label already formatted using '%s'"),
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format);
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else
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ret = 0;
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break;
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case VIR_STORAGE_PARTED_DIFFERENT:
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virReportError(VIR_ERR_OPERATION_FAILED, "%s",
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_("Known, but different label format present, "
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"requires build --overwrite"));
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break;
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case VIR_STORAGE_PARTED_UNKNOWN:
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if (writelabel)
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ret = 0;
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else
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virReportError(VIR_ERR_OPERATION_FAILED, "%s",
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_("Unrecognized disk label found, requires build"));
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break;
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case VIR_STORAGE_PARTED_NOPTTYPE:
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virReportError(VIR_ERR_OPERATION_FAILED, "%s",
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_("Unable to determine Partition Type, "
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"requires build --overwrite"));
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break;
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case VIR_STORAGE_PARTED_PTTYPE_UNK:
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virReportError(VIR_ERR_OPERATION_FAILED, "%s",
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_("Unknown Partition Type, requires build --overwrite"));
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break;
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}
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return ret;
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}
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static int
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virStorageBackendDiskStartPool(virConnectPtr conn ATTRIBUTE_UNUSED,
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virStoragePoolObjPtr pool)
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@ -28,4 +28,7 @@
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extern virStorageBackend virStorageBackendDisk;
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int virStorageBackendDiskValidLabel(const char *device,
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const char *format,
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bool writelabel);
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#endif /* __VIR_STORAGE_BACKEND_DISK_H__ */
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