unarchive: add support for .tar.zst (zstd compression)

changelogs/fragments/unarchive-support-zst.yml

@@ -0,0 +1,2 @@
+minor_changes:
+  - unarchive - Add support for .tar.zst (zstd compression) (https://github.com/ansible/ansible/pull/73265).

lib/ansible/modules/unarchive.py

@@ -110,8 +110,9 @@
     - Re-implement zip support using native zipfile module.
 notes:
     - Requires C(zipinfo) and C(gtar)/C(unzip) command on target host.
-    - Can handle I(.zip) files using C(unzip) as well as I(.tar), I(.tar.gz), I(.tar.bz2) and I(.tar.xz) files using C(gtar).
-    - Does not handle I(.gz) files, I(.bz2) files or I(.xz) files that do not contain a I(.tar) archive.
+    - Requires C(zstd) command on target host to expand I(.tar.zst) files.
+    - Can handle I(.zip) files using C(unzip) as well as I(.tar), I(.tar.gz), I(.tar.bz2), I(.tar.xz), and I(.tar.zst) files using C(gtar).
+    - Does not handle I(.gz) files, I(.bz2) files, I(.xz), or I(.zst) files that do not contain a I(.tar) archive.
     - Uses gtar's C(--diff) arg to calculate if changed or not. If this C(arg) is not
       supported, it will always unpack the archive.
     - Existing files/directories in the destination which are not in the archive
@@ -891,9 +892,22 @@ def __init__(self, src, b_dest, file_args, module):
         self.zipflag = '-J'
 
 
+# Class to handle zstd compressed tar files
+class TarZstdArchive(TgzArchive):
+    def __init__(self, src, b_dest, file_args, module):
+        super(TarZstdArchive, self).__init__(src, b_dest, file_args, module)
+        # GNU Tar supports the --use-compress-program option to
+        # specify which executable to use for
+        # compression/decompression.
+        #
+        # Note: some flavors of BSD tar support --zstd (e.g., FreeBSD
+        # 12.2), but the TgzArchive class only supports GNU Tar.
+        self.zipflag = '--use-compress-program=zstd'
+
+
 # try handlers in order and return the one that works or bail if none work
 def pick_handler(src, dest, file_args, module):
-    handlers = [ZipArchive, TgzArchive, TarArchive, TarBzipArchive, TarXzArchive]
+    handlers = [ZipArchive, TgzArchive, TarArchive, TarBzipArchive, TarXzArchive, TarZstdArchive]
     reasons = set()
     for handler in handlers:
         obj = handler(src, dest, file_args, module)

test/integration/targets/unarchive/tasks/main.yml

@@ -4,6 +4,7 @@
 - import_tasks: test_tar_gz_creates.yml
 - import_tasks: test_tar_gz_owner_group.yml
 - import_tasks: test_tar_gz_keep_newer.yml
+- import_tasks: test_tar_zst.yml
 - import_tasks: test_zip.yml
 - import_tasks: test_exclude.yml
 - import_tasks: test_include.yml

test/integration/targets/unarchive/tasks/prepare_tests.yml

@@ -6,6 +6,13 @@
       - unzip
   when: ansible_pkg_mgr in ('yum', 'dnf', 'apt', 'pkgng')
 
+- name: Ensure zstd is present, if available
+  ignore_errors: true
+  package:
+    name:
+      - zstd
+  when: ansible_pkg_mgr in ('yum', 'dnf', 'apt', 'pkgng')
+
 - name: prep our file
   copy:
     src: foo.txt
@@ -18,6 +25,28 @@
 - name: prep a tar.gz file
   shell: tar czvf test-unarchive.tar.gz foo-unarchive.txt chdir={{remote_tmp_dir}}
 
+- name: see if we have the zstd executable
+  ignore_errors: true
+  shell: zstd --version
+  register: zstd_available
+
+- when: zstd_available.rc == 0
+  block:
+    - name: find gnu tar
+      shell: |
+        #!/bin/sh
+        which gtar 2>/dev/null
+        if test $? -ne 0; then
+            if test -z "`tar --version | grep bsdtar`"; then
+               which tar
+            fi
+        fi
+      register: gnu_tar
+
+    - name: prep a tar.zst file
+      shell: "{{ gnu_tar.stdout }} --use-compress-program=zstd -cvf test-unarchive.tar.zst foo-unarchive.txt chdir={{remote_tmp_dir}}"
+      when: gnu_tar.stdout != ""
+
 - name: prep a chmodded file for zip
   copy:
     src: foo.txt

test/integration/targets/unarchive/tasks/test_tar_zst.yml

@@ -0,0 +1,40 @@
+# Only do this whole file when the "zstd" executable is present
+- when:
+    - zstd_available.rc == 0
+    - gnu_tar.stdout != ""
+  block:
+    - name: create our tar.zst unarchive destination
+      file:
+        path: '{{remote_tmp_dir}}/test-unarchive-tar-zst'
+        state: directory
+
+    - name: unarchive a tar.zst file
+      unarchive:
+        src: '{{remote_tmp_dir}}/test-unarchive.tar.zst'
+        dest: '{{remote_tmp_dir}}/test-unarchive-tar-zst'
+        remote_src: yes
+      register: unarchive02
+
+    - name: verify that the file was marked as changed
+      assert:
+        that:
+          - "unarchive02.changed == true"
+          # Verify that no file list is generated
+          - "'files' not in unarchive02"
+
+    - name: verify that the file was unarchived
+      file:
+        path: '{{remote_tmp_dir}}/test-unarchive-tar-zst/foo-unarchive.txt'
+        state: file
+
+    - name: remove our tar.zst unarchive destination
+      file:
+        path: '{{remote_tmp_dir}}/test-unarchive-tar-zst'
+        state: absent
+
+    - name: test owner/group perms
+      include_tasks: test_owner_group.yml
+      vars:
+        ext: tar.zst
+        archive: test-unarchive.tar.zst
+        testfile: foo-unarchive.txt