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virsh: remove limits on tree listing
I am not a fan of fixed-width buffers. All it takes is a linear chain of more than 100 snapshots to mess up 'virsh snapshot-list --tree'. Now that virBuffer is more powerful, we might as well exploit its power. * tools/virsh.c (cmdNodeListDevicesPrint): Simplify to use a virBuffer instead of fixed-width prefix, factor guts, and rename... (vshTreePrint, vshTreePrintInternal): ...along with new helper. (cmdNodeListDevices, cmdSnapshotList): Update callers.
This commit is contained in:
Eric Blake
parent
9202f2c220
commit
ef981053ca
196
tools/virsh.c
196
tools/virsh.c
@ -13164,6 +13164,86 @@ cmdVersion(vshControl *ctl, const vshCmd *cmd ATTRIBUTE_UNUSED)
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return true;
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}
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/* Tree listing helpers. */
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static int
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vshTreePrintInternal(vshControl *ctl,
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char **devices,
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char **parents,
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int num_devices,
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int devid,
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int lastdev,
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bool root,
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virBufferPtr indent)
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{
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int i;
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int nextlastdev = -1;
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int ret = -1;
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if (virBufferError(indent))
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goto cleanup;
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/* Print this device, with indent if not at root */
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vshPrint(ctl, "%s%s%s\n", virBufferCurrentContent(indent),
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root ? "" : "+- ", devices[devid]);
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/* Update indent to show '|' or ' ' for child devices */
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if (!root) {
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virBufferAddChar(indent, devid == lastdev ? ' ' : '|');
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virBufferAddChar(indent, ' ');
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if (virBufferError(indent))
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goto cleanup;
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}
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/* Determine the index of the last child device */
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for (i = 0 ; i < num_devices ; i++) {
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if (parents[i] &&
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STREQ(parents[i], devices[devid])) {
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nextlastdev = i;
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}
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}
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/* If there is a child device, then print another blank line */
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if (nextlastdev != -1)
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vshPrint(ctl, "%s |\n", virBufferCurrentContent(indent));
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/* Finally print all children */
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virBufferAddLit(indent, " ");
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for (i = 0 ; i < num_devices ; i++) {
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if (parents[i] && STREQ(parents[i], devices[devid]) &&
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vshTreePrintInternal(ctl, devices, parents,
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num_devices, i, nextlastdev,
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false, indent) < 0)
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goto cleanup;
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}
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virBufferTrim(indent, " ", -1);
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/* If there was no child device, and we're the last in
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* a list of devices, then print another blank line */
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if (nextlastdev == -1 && devid == lastdev)
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vshPrint(ctl, "%s\n", virBufferCurrentContent(indent));
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if (!root)
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virBufferTrim(indent, NULL, 2);
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ret = 0;
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cleanup:
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return ret;
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}
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static int
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vshTreePrint(vshControl *ctl, char **devices, char **parents,
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int num_devices, int devid)
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{
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int ret;
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virBuffer indent = VIR_BUFFER_INITIALIZER;
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ret = vshTreePrintInternal(ctl, devices, parents, num_devices,
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devid, devid, true, &indent);
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if (ret < 0)
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vshError(ctl, "%s", _("Failed to complete tree listing"));
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virBufferFreeAndReset(&indent);
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return ret;
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}
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/*
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* "nodedev-list" command
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*/
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@ -13179,93 +13259,14 @@ static const vshCmdOptDef opts_node_list_devices[] = {
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{NULL, 0, 0, NULL}
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};
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#define MAX_DEPTH 100
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#define INDENT_SIZE 4
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#define INDENT_BUFLEN ((MAX_DEPTH * INDENT_SIZE) + 1)
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static void
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cmdNodeListDevicesPrint(vshControl *ctl,
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char **devices,
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char **parents,
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int num_devices,
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int devid,
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int lastdev,
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unsigned int depth,
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unsigned int indentIdx,
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char *indentBuf)
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{
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int i;
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int nextlastdev = -1;
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/* Prepare indent for this device, but not if at root */
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if (depth && depth < MAX_DEPTH) {
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indentBuf[indentIdx] = '+';
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indentBuf[indentIdx+1] = '-';
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indentBuf[indentIdx+2] = ' ';
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indentBuf[indentIdx+3] = '\0';
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}
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/* Print this device */
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vshPrint(ctl, "%s", indentBuf);
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vshPrint(ctl, "%s\n", devices[devid]);
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/* Update indent to show '|' or ' ' for child devices */
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if (depth && depth < MAX_DEPTH) {
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if (devid == lastdev)
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indentBuf[indentIdx] = ' ';
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else
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indentBuf[indentIdx] = '|';
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indentBuf[indentIdx+1] = ' ';
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indentIdx+=2;
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}
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/* Determine the index of the last child device */
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for (i = 0 ; i < num_devices ; i++) {
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if (parents[i] &&
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STREQ(parents[i], devices[devid])) {
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nextlastdev = i;
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}
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}
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/* If there is a child device, then print another blank line */
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if (nextlastdev != -1) {
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vshPrint(ctl, "%s", indentBuf);
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vshPrint(ctl, " |\n");
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}
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/* Finally print all children */
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if (depth < MAX_DEPTH)
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indentBuf[indentIdx] = ' ';
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for (i = 0 ; i < num_devices ; i++) {
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if (depth < MAX_DEPTH) {
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indentBuf[indentIdx] = ' ';
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indentBuf[indentIdx+1] = ' ';
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}
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if (parents[i] &&
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STREQ(parents[i], devices[devid]))
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cmdNodeListDevicesPrint(ctl, devices, parents,
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num_devices, i, nextlastdev,
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depth + 1, indentIdx + 2, indentBuf);
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if (depth < MAX_DEPTH)
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indentBuf[indentIdx] = '\0';
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}
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/* If there was no child device, and we're the last in
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* a list of devices, then print another blank line */
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if (nextlastdev == -1 && devid == lastdev) {
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vshPrint(ctl, "%s", indentBuf);
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vshPrint(ctl, "\n");
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}
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}
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static bool
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cmdNodeListDevices (vshControl *ctl, const vshCmd *cmd ATTRIBUTE_UNUSED)
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cmdNodeListDevices(vshControl *ctl, const vshCmd *cmd ATTRIBUTE_UNUSED)
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{
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const char *cap = NULL;
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char **devices;
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int num_devices, i;
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bool tree = vshCommandOptBool(cmd, "tree");
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bool ret = true;
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if (!vshConnectionUsability(ctl, ctl->conn))
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return false;
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@ -13291,8 +13292,8 @@ cmdNodeListDevices (vshControl *ctl, const vshCmd *cmd ATTRIBUTE_UNUSED)
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}
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qsort(&devices[0], num_devices, sizeof(char*), namesorter);
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if (tree) {
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char indentBuf[INDENT_BUFLEN];
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char **parents = vshMalloc(ctl, sizeof(char *) * num_devices);
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for (i = 0; i < num_devices; i++) {
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virNodeDevicePtr dev = virNodeDeviceLookupByName(ctl->conn, devices[i]);
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if (dev && STRNEQ(devices[i], "computer")) {
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@ -13304,17 +13305,9 @@ cmdNodeListDevices (vshControl *ctl, const vshCmd *cmd ATTRIBUTE_UNUSED)
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virNodeDeviceFree(dev);
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}
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for (i = 0 ; i < num_devices ; i++) {
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memset(indentBuf, '\0', sizeof(indentBuf));
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if (parents[i] == NULL)
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cmdNodeListDevicesPrint(ctl,
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devices,
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parents,
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num_devices,
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i,
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i,
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0,
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0,
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indentBuf);
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if (parents[i] == NULL &&
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vshTreePrint(ctl, devices, parents, num_devices, i) < 0)
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ret = false;
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}
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for (i = 0 ; i < num_devices ; i++) {
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VIR_FREE(devices[i]);
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@ -13328,7 +13321,7 @@ cmdNodeListDevices (vshControl *ctl, const vshCmd *cmd ATTRIBUTE_UNUSED)
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}
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}
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VIR_FREE(devices);
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return true;
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return ret;
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}
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/*
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@ -16762,20 +16755,11 @@ cmdSnapshotList(vshControl *ctl, const vshCmd *cmd)
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}
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}
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if (tree) {
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char indentBuf[INDENT_BUFLEN];
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for (i = 0 ; i < actual ; i++) {
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memset(indentBuf, '\0', sizeof(indentBuf));
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if ((from && ctl->useSnapshotOld) ? STREQ(names[i], from) :
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!parents[i])
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cmdNodeListDevicesPrint(ctl,
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names,
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parents,
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actual,
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i,
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i,
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0,
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0,
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indentBuf);
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!parents[i] &&
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vshTreePrint(ctl, names, parents, actual, i) < 0)
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goto cleanup;
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}
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ret = true;
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