repo: Refactor "repo" subcomand

Refactor the "repo" sub-command for easier maintenance
and readability. No functionality changes were made in this
refactoring.

As a side affect, this treats apt-ostree more like a library
so that other StarlingX projects can use apt-ostree to manage
images and/or packages.

Test Plan
PASSED Installed apt-ostree from git repo.
PASSED mkdir -p /var/repository
PASSED sudo apt-ostree repo init \
    --feed /var/repository --release bullseye
    --origin starlingx
PASSED sudo apt-ostree repo list --release bullseye

Story: 2010867
Task: 48556

Change-Id: Iaa5dbf6233b0175eefec67ba666c66b47bc01e66
Signed-off-by: Charles Short <charles.short@windriver.com>

apt_ostree/cmd/repo/__init__.py

@@ -13,7 +13,7 @@ from apt_ostree.cmd.repo.list import show
 from apt_ostree.cmd.repo.remove import remove
 
 
-@click.group(help="Commands to create/manage Debian package repository")
+@click.group(help="Create/manage Debian package repository.")
 @click.pass_context
 def repo(ctxt):
     pass

apt_ostree/cmd/repo/add.py

@@ -4,7 +4,7 @@ Copyright (c) 2023 Wind River Systems, Inc.
 SPDX-License-Identifier: Apache-2.0
 
 """
-import shutil
+import errno
 import sys
 
 import click
@@ -13,7 +13,6 @@ from apt_ostree.cmd.options import feed_option
 from apt_ostree.cmd.options import packages_option
 from apt_ostree.cmd.options import release_option
 from apt_ostree.cmd import pass_state_context
-from apt_ostree.log import complete_step
 from apt_ostree.repo import Repo
 
 
@@ -23,10 +22,13 @@ from apt_ostree.repo import Repo
 @release_option
 @packages_option
 def add(state, feed, release, packages):
-    if shutil.which("reprepro") is None:
-        click.secho("reprepro was not found in your $PATH")
-        sys.exit(0)
-
-    with complete_step(
-            f"Adding packages to {state.feed}"):
+    try:
         Repo(state).add()
+    except KeyboardInterrupt:
+        click.secho("\n" + ("Exiting at your request."))
+        sys.exit(130)
+    except BrokenPipeError:
+        sys.exit()
+    except OSError as error:
+        if error.errno == errno.ENOSPC:
+            sys.exit("errror - No space left on device.")

apt_ostree/cmd/repo/init.py

@@ -5,7 +5,7 @@ SPDX-License-Identifier: Apache-2.0
 
 """
 
-import shutil
+import errno
 import sys
 
 import click
@@ -15,7 +15,6 @@ from apt_ostree.cmd.options import feed_option
 from apt_ostree.cmd.options import origin_option
 from apt_ostree.cmd.options import release_option
 from apt_ostree.cmd import pass_state_context
-from apt_ostree.log import complete_step
 from apt_ostree.repo import Repo
 
 
@@ -25,10 +24,13 @@ from apt_ostree.repo import Repo
 @release_option
 @origin_option
 def init(state, feed, release, origin):
-    if shutil.which("reprepro") is None:
-        click.secho("reprepro was not found in your $PATH")
-        sys.exit(0)
-
-    with complete_step(
-            f"Creating Debian package repository in {state.feed}."):
+    try:
         Repo(state).init()
+    except KeyboardInterrupt:
+        click.secho("\n" + ("Exiting at your request."))
+        sys.exit(130)
+    except BrokenPipeError:
+        sys.exit()
+    except OSError as error:
+        if error.errno == errno.ENOSPC:
+            sys.exit("errror - No space left on device.")

apt_ostree/cmd/repo/list.py

@@ -5,7 +5,7 @@ SPDX-License-Identifier: Apache-2.0
 
 """
 
-import shutil
+import errno
 import sys
 
 import click
@@ -21,8 +21,13 @@ from apt_ostree.repo import Repo
 @feed_option
 @release_option
 def show(state, feed, release):
-    if shutil.which("reprepro") is None:
-        click.secho("reprepro was not found in your $PATH")
-        sys.exit(0)
-
-    Repo(state).show()
+    try:
+        Repo(state).show()
+    except KeyboardInterrupt:
+        click.secho("\n" + ("Exiting at your request."))
+        sys.exit(130)
+    except BrokenPipeError:
+        sys.exit()
+    except OSError as error:
+        if error.errno == errno.ENOSPC:
+            sys.exit("errror - No space left on device.")

apt_ostree/cmd/repo/remove.py

@@ -5,7 +5,7 @@ SPDX-License-Identifier: Apache-2.0
 
 """
 
-import shutil
+import errno
 import sys
 
 import click
@@ -14,20 +14,22 @@ from apt_ostree.cmd.options import feed_option
 from apt_ostree.cmd.options import packages_option
 from apt_ostree.cmd.options import release_option
 from apt_ostree.cmd import pass_state_context
-from apt_ostree.log import complete_step
 from apt_ostree.repo import Repo
 
 
-@click.command(help="Remove debian package(s) from reposiotry")
+@click.command(help="Remove debian package(s) from reposiotry.")
 @pass_state_context
 @feed_option
 @release_option
 @packages_option
 def remove(state, feed, release, packages):
-    if shutil.which("reprepro") is None:
-        click.secho("reprepro was not found in your $PATH")
-        sys.exit(0)
-
-    with complete_step(
-            f"Removing packages from {state.feed}"):
+    try:
         Repo(state).remove()
+    except KeyboardInterrupt:
+        click.secho("\n" + ("Exiting at your request."))
+        sys.exit(130)
+    except BrokenPipeError:
+        sys.exit()
+    except OSError as error:
+        if error.errno == errno.ENOSPC:
+            sys.exit("errror - No space left on device.")

apt_ostree/repo.py

@@ -60,7 +60,7 @@ class Repo:
                 )
 
     def add(self):
-        """Add Debian package(s) to repository"""
+        """Add Debian package(s) to repository."""
         for pkg in self.state.packages:
             log_step(f"Adding {pkg}")
             r = run_command(
@@ -102,6 +102,7 @@ class Repo:
             self.console.print(table)
 
     def remove(self):
+        """Remove a Debian package from an archive."""
         for pkg in self.state.packages:
             log_step(f"Removing {pkg}")
             r = run_command(