143 lines
3.2 KiB
Go
143 lines
3.2 KiB
Go
package command
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import (
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"fmt"
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"io"
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"os"
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"strings"
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)
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type FSCatCommand struct {
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Meta
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}
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func (f *FSCatCommand) Help() string {
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helpText := `
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Usage: nomad fs cat <alloc-id> <path>
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Dispays a file in an allocation directory at the given path.
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The path is relative to the allocation directory and defaults to root if unspecified.
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General Options:
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` + generalOptionsUsage() + `
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Cat Options:
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-verbose
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Show full information.
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`
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return strings.TrimSpace(helpText)
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}
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func (f *FSCatCommand) Synopsis() string {
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return "Cat a file in an allocation directory"
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}
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func (f *FSCatCommand) Run(args []string) int {
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var verbose bool
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flags := f.Meta.FlagSet("fs-list", FlagSetClient)
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flags.Usage = func() { f.Ui.Output(f.Help()) }
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flags.BoolVar(&verbose, "verbose", false, "")
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if err := flags.Parse(args); err != nil {
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return 1
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}
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args = flags.Args()
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if len(args) < 1 {
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f.Ui.Error("allocation id is a required parameter")
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return 1
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}
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allocID := args[0]
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path := "/"
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if len(args) == 2 {
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path = args[1]
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}
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client, err := f.Meta.Client()
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if err != nil {
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f.Ui.Error(fmt.Sprintf("Error inititalizing client: %v", err))
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return 1
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}
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// Truncate the id unless full length is requested
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length := shortId
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if verbose {
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length = fullId
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}
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// Query the allocation info
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if len(allocID) == 1 {
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f.Ui.Error(fmt.Sprintf("Alloc ID must contain at least two characters."))
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return 1
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}
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if len(allocID)%2 == 1 {
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// Identifiers must be of even length, so we strip off the last byte
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// to provide a consistent user experience.
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allocID = allocID[:len(allocID)-1]
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}
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allocs, _, err := client.Allocations().PrefixList(allocID)
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if err != nil {
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f.Ui.Error(fmt.Sprintf("Error querying allocation: %v", err))
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return 1
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}
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if len(allocs) == 0 {
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f.Ui.Error(fmt.Sprintf("No allocation(s) with prefix or id %q found", allocID))
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return 1
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}
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if len(allocs) > 1 {
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// Format the allocs
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out := make([]string, len(allocs)+1)
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out[0] = "ID|Eval ID|Job ID|Task Group|Desired Status|Client Status"
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for i, alloc := range allocs {
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out[i+1] = fmt.Sprintf("%s|%s|%s|%s|%s|%s",
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limit(alloc.ID, length),
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limit(alloc.EvalID, length),
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alloc.JobID,
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alloc.TaskGroup,
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alloc.DesiredStatus,
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alloc.ClientStatus,
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)
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}
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f.Ui.Output(fmt.Sprintf("Prefix matched multiple allocations\n\n%s", formatList(out)))
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return 0
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}
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// Prefix lookup matched a single allocation
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alloc, _, err := client.Allocations().Info(allocs[0].ID, nil)
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if err != nil {
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f.Ui.Error(fmt.Sprintf("Error querying allocation: %s", err))
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return 1
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}
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if alloc.DesiredStatus == "failed" {
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allocID := limit(alloc.ID, length)
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msg := fmt.Sprintf(`The allocation %q failed to be placed. To see the cause, run:
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nomad alloc-status %s`, allocID, allocID)
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f.Ui.Error(msg)
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return 0
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}
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// Stat the file to find it's size
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file, _, err := client.AllocFS().Stat(alloc, path, nil)
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if err != nil {
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f.Ui.Error(err.Error())
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return 1
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}
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if file.IsDir {
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f.Ui.Error(fmt.Sprintf("The file %q is a directory", file.Name))
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return 1
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}
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// Get the contents of the file
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offset := 0
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limit := file.Size
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r, _, err := client.AllocFS().ReadAt(alloc, path, int64(offset), limit, nil)
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if err != nil {
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f.Ui.Error(fmt.Sprintf("Error reading file: %v", err))
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return 1
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}
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io.Copy(os.Stdout, r)
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return 0
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}
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