undocker

extract docker archives
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main_test.go (3367B) - Raw

      1 package main
      2 
      3 import (
      4 	"bytes"
      5 	"errors"
      6 	"io"
      7 	"os"
      8 	"path/filepath"
      9 	"regexp"
     10 	"testing"
     11 )
     12 
     13 func TestExecute(t *testing.T) {
     14 	var _foo = []byte("foo foo")
     15 
     16 	tests := []struct {
     17 		name      string
     18 		fixture   func(*testing.T, string)
     19 		flattener func(io.ReadSeeker, io.Writer) error
     20 		infile    string
     21 		outfile   string
     22 		wantErr   string
     23 		assertion func(*testing.T, string)
     24 	}{
     25 		{
     26 			name:   "ok passthrough via stdout",
     27 			infile: "t10-in.txt",
     28 			fixture: func(t *testing.T, dir string) {
     29 				fname := filepath.Join(dir, "t10-in.txt")
     30 				if err := os.WriteFile(fname, _foo, 0644); err != nil {
     31 					t.Fatalf("unexpected error: %v", err)
     32 				}
     33 			},
     34 			outfile: "-",
     35 		},
     36 		{
     37 			name:   "ok passthrough via file",
     38 			infile: "t20-in.txt",
     39 			fixture: func(t *testing.T, dir string) {
     40 				fname := filepath.Join(dir, "t20-in.txt")
     41 				if err := os.WriteFile(fname, _foo, 0644); err != nil {
     42 					t.Fatalf("unexpected error: %v", err)
     43 				}
     44 			},
     45 			outfile: "t20-out.txt",
     46 		},
     47 		{
     48 			name:   "bad flattener should remove the file",
     49 			infile: "t30-in.txt",
     50 			fixture: func(t *testing.T, dir string) {
     51 				fname := filepath.Join(dir, "t30-in.txt")
     52 				if err := os.WriteFile(fname, _foo, 0644); err != nil {
     53 					t.Fatalf("unexpected error: %v", err)
     54 				}
     55 			},
     56 			flattener: flattenBad,
     57 			outfile:   "t30-out.txt",
     58 			wantErr:   "some error",
     59 			assertion: func(t *testing.T, dir string) {
     60 				d, err := os.ReadDir(dir)
     61 				if err != nil {
     62 					t.Fatalf("unexpected error: %v", err)
     63 				}
     64 				if len(d) != 1 {
     65 					t.Fatalf("expected 1 entry, got %d", len(d))
     66 				}
     67 				if d[0].Name() != "t30-in.txt" {
     68 					t.Fatalf("expected to find only t30-in.txt, got %s", d[0].Name())
     69 				}
     70 			},
     71 		},
     72 		{
     73 			name:    "infile does not exist",
     74 			infile:  "t3-does-not-exist.txt",
     75 			wantErr: "^open .*not-exist.txt: no such file or directory$",
     76 		},
     77 		{
     78 			name:    "outpath dir not writable",
     79 			outfile: filepath.Join("t4", "does", "not", "exist"),
     80 			wantErr: "^create: open .*not/exist: no such file or directory",
     81 		},
     82 	}
     83 
     84 	for _, tt := range tests {
     85 		t.Run(tt.name, func(t *testing.T) {
     86 			dir := t.TempDir()
     87 			var stdout bytes.Buffer
     88 			if tt.flattener == nil {
     89 				tt.flattener = flattenPassthrough
     90 			}
     91 
     92 			if tt.fixture != nil {
     93 				tt.fixture(t, dir)
     94 			}
     95 			if tt.outfile != "-" {
     96 				tt.outfile = filepath.Join(dir, tt.outfile)
     97 			}
     98 			inf := filepath.Join(dir, tt.infile)
     99 
    100 			c := &command{Stdout: &stdout, flattener: tt.flattener}
    101 			err := c.execute(inf, tt.outfile)
    102 
    103 			if tt.assertion != nil {
    104 				tt.assertion(t, dir)
    105 			}
    106 
    107 			if tt.wantErr != "" {
    108 				if err == nil {
    109 					t.Fatal("expected error, got nil")
    110 				}
    111 				r := regexp.MustCompile(tt.wantErr)
    112 				if r.FindStringIndex(err.Error()) == nil {
    113 					t.Errorf("%s not found in %s", tt.wantErr, err.Error())
    114 				}
    115 				return
    116 			}
    117 			if err != nil {
    118 				t.Fatalf("unexpected error: %v", err)
    119 			}
    120 			var out []byte
    121 			if tt.outfile == "-" {
    122 				out = stdout.Bytes()
    123 			} else {
    124 				out, err = os.ReadFile(tt.outfile)
    125 				if err != nil {
    126 					t.Fatalf("unexpected error: %v", err)
    127 				}
    128 			}
    129 			if !bytes.Equal([]byte("foo foo"), out) {
    130 				t.Errorf("out != foo foo: %q", string(out))
    131 			}
    132 
    133 		})
    134 	}
    135 }
    136 
    137 func flattenPassthrough(r io.ReadSeeker, w io.Writer) error {
    138 	_, err := io.Copy(w, r)
    139 	return err
    140 }
    141 
    142 func flattenBad(_ io.ReadSeeker, _ io.Writer) error {
    143 	return errors.New("some error")
    144 }