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walk: implement FsEval hooks

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In certain circumstances (such as the manifest generation of a
filesystem as an unprivileged user) it is important to provide hooks
that override the default os.* implementation of filesystem-related
functions.

In order to avoid merging too much code from outside projects (such as
umoci) this is implemented by providing FsEval hooks to Walk() and
Check(). This allows for users of go-mtree to modify how filesystem
checks are done, without compromising the simplicity of go-mtree's code.

Signed-off-by: Aleksa Sarai <asarai@suse.de>
This commit is contained in:
Aleksa Sarai 2016-11-18 18:53:26 +11:00
parent 98824a87da
commit e22043cb86
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GPG key ID: 9E18AA267DDB8DB4
9 changed files with 110 additions and 57 deletions
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34
check_test.go
View file

@ -12,12 +12,12 @@ import (
// simple walk of current directory, and imediately check it.
// may not be parallelizable.
func TestCheck(t *testing.T) {
dh, err := Walk(".", nil, append(DefaultKeywords, "sha1"))
dh, err := Walk(".", nil, append(DefaultKeywords, "sha1"), nil)
if err != nil {
t.Fatal(err)
}
res, err := Check(".", dh, nil)
res, err := Check(".", dh, nil, nil)
if err != nil {
t.Fatal(err)
}
@ -43,13 +43,13 @@ func TestCheckKeywords(t *testing.T) {
}
// Walk this tempdir
dh, err := Walk(dir, nil, append(DefaultKeywords, "sha1"))
dh, err := Walk(dir, nil, append(DefaultKeywords, "sha1"), nil)
if err != nil {
t.Fatal(err)
}
// Check for sanity. This ought to pass.
res, err := Check(dir, dh, nil)
res, err := Check(dir, dh, nil, nil)
if err != nil {
t.Fatal(err)
}
@ -64,7 +64,7 @@ func TestCheckKeywords(t *testing.T) {
}
// Check again. This ought to fail.
res, err = Check(dir, dh, nil)
res, err = Check(dir, dh, nil, nil)
if err != nil {
t.Fatal(err)
}
@ -76,7 +76,7 @@ func TestCheckKeywords(t *testing.T) {
}
// Check again, but only sha1 and mode. This ought to pass.
res, err = Check(dir, dh, []Keyword{"sha1", "mode"})
res, err = Check(dir, dh, []Keyword{"sha1", "mode"}, nil)
if err != nil {
t.Fatal(err)
}
@ -86,12 +86,12 @@ func TestCheckKeywords(t *testing.T) {
}
func ExampleCheck() {
dh, err := Walk(".", nil, append(DefaultKeywords, "sha1"))
dh, err := Walk(".", nil, append(DefaultKeywords, "sha1"), nil)
if err != nil {
// handle error ...
}
res, err := Check(".", dh, nil)
res, err := Check(".", dh, nil, nil)
if err != nil {
// handle error ...
}
@ -103,11 +103,11 @@ func ExampleCheck() {
// Tests default action for evaluating a symlink, which is just to compare the
// link itself, not to follow it
func TestDefaultBrokenLink(t *testing.T) {
dh, err := Walk("./testdata/dirwithbrokenlink", nil, append(DefaultKeywords, "sha1"))
dh, err := Walk("./testdata/dirwithbrokenlink", nil, append(DefaultKeywords, "sha1"), nil)
if err != nil {
t.Fatal(err)
}
res, err := Check("./testdata/dirwithbrokenlink", dh, nil)
res, err := Check("./testdata/dirwithbrokenlink", dh, nil, nil)
if err != nil {
t.Fatal(err)
}
@ -155,7 +155,7 @@ func TestTimeComparison(t *testing.T) {
t.Fatal(err)
}
res, err := Check(dir, dh, nil)
res, err := Check(dir, dh, nil, nil)
if err != nil {
t.Error(err)
}
@ -203,13 +203,13 @@ func TestTarTime(t *testing.T) {
keywords := dh.UsedKeywords()
// make sure "time" keyword works
_, err = Check(dir, dh, keywords)
_, err = Check(dir, dh, keywords, nil)
if err != nil {
t.Error(err)
}
// make sure tar_time wins
res, err := Check(dir, dh, append(keywords, "tar_time"))
res, err := Check(dir, dh, append(keywords, "tar_time"), nil)
if err != nil {
t.Error(err)
}
@ -254,7 +254,7 @@ func TestIgnoreComments(t *testing.T) {
t.Fatal(err)
}
res, err := Check(dir, dh, nil)
res, err := Check(dir, dh, nil, nil)
if err != nil {
t.Error(err)
}
@ -274,7 +274,7 @@ func TestIgnoreComments(t *testing.T) {
`
dh, err = ParseSpec(bytes.NewBufferString(spec))
res, err = Check(dir, dh, nil)
res, err = Check(dir, dh, nil, nil)
if err != nil {
t.Error(err)
}
@ -306,11 +306,11 @@ func TestCheckNeedsEncoding(t *testing.T) {
t.Error(err)
}
dh, err := Walk(dir, nil, DefaultKeywords)
dh, err := Walk(dir, nil, DefaultKeywords, nil)
if err != nil {
t.Fatal(err)
}
res, err := Check(dir, dh, nil)
res, err := Check(dir, dh, nil, nil)
if err != nil {
t.Fatal(err)
}