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copy: Add --digestfile

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`podman push` gained this a while ago, and we want it here for the
same reason.

Motivated by closing a race condition in ostree-rs-ext:
17a991050c/lib/src/container/export.rs (L85)

Co-authored-by: Miloslav Trmač <mitr@redhat.com>
This commit is contained in:
Colin Walters
2021-04-27 16:24:45 -04:00
parent ce4304a0ad
commit a32be320cb
3 changed files with 36 additions and 2 deletions
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15
integration/copy_test.go
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@@ -246,6 +246,21 @@ func (s *CopySuite) TestCopyWithManifestListDigest(c *check.C) {
c.Assert(out, check.Equals, "")
}
func (s *CopySuite) TestCopyWithDigestfileOutput(c *check.C) {
tempdir, err := ioutil.TempDir("", "tempdir")
c.Assert(err, check.IsNil)
defer os.RemoveAll(tempdir)
dir1, err := ioutil.TempDir("", "copy-manifest-list-digest-dir")
c.Assert(err, check.IsNil)
defer os.RemoveAll(dir1)
digestOutPath := filepath.Join(tempdir, "digest.txt")
assertSkopeoSucceeds(c, "", "copy", "--digestfile="+digestOutPath, knownListImage, "dir:"+dir1)
readDigest, err := ioutil.ReadFile(digestOutPath)
c.Assert(err, check.IsNil)
_, err = digest.Parse(string(readDigest))
c.Assert(err, check.IsNil)
}
func (s *CopySuite) TestCopyWithManifestListStorageDigest(c *check.C) {
storage, err := ioutil.TempDir("", "copy-manifest-list-storage-digest")
c.Assert(err, check.IsNil)