fix pacman upgrade bug

packaging/os/pacman.py

@@ -67,6 +67,9 @@ EXAMPLES = '''
 # Install package foo
 - pacman: name=foo state=present
 
+# Upgrade package foo
+- pacman: name=foo state=present update_cache=yes
+
 # Remove packages foo and bar
 - pacman: name=foo,bar state=absent
 
@@ -85,17 +88,37 @@ import sys
 
 PACMAN_PATH = "/usr/bin/pacman"
 
+def get_version(pacman_output):
+    """Take pacman -Qi or pacman -Si output and get the Version"""
+    lines = pacman_output.split('\n')
+    for line in lines:
+        if 'Version' in line:
+            return line.split(':')[1].strip()
+    return None
+
 def query_package(module, name, state="present"):
-    # pacman -Q returns 0 if the package is installed,
-    # 1 if it is not installed
+    """Query the package status in both the local system and the repository. Returns a boolean to indicate if the package is installed, and a second boolean to indicate if the package is up-to-date."""
     if state == "present":
-        cmd = "pacman -Q %s" % (name)
-        rc, stdout, stderr = module.run_command(cmd, check_rc=False)
+        lcmd = "pacman -Qi %s" % (name)
+        lrc, lstdout, lstderr = module.run_command(lcmd, check_rc=False)
+        if lrc != 0:
+            # package is not installed locally
+            return False, False
         
-        if rc == 0:
-            return True
+        # get the version installed locally (if any)
+        lversion = get_version(lstdout)
         
-        return False
+        rcmd = "pacman -Si %s" % (name)
+        rrc, rstdout, rstderr = module.run_command(rcmd, check_rc=False)
+        # get the version in the repository
+        rversion = get_version(rstdout)
+
+        if rrc == 0:
+            # Return True to indicate that the package is installed locally, and the result of the version number comparison
+            # to determine if the package is up-to-date.
+            return True, (lversion == rversion)
+
+        return False, False
 
 
 def update_package_db(module):
@@ -118,7 +141,8 @@ def remove_packages(module, packages):
     # Using a for loop incase of error, we can report the package that failed
     for package in packages:
         # Query the package first, to see if we even need to remove
-        if not query_package(module, package):
+        installed, updated = query_package(module, package)
+        if not installed:
             continue
 
         cmd = "pacman -%s %s --noconfirm" % (args, package)
@@ -140,7 +164,9 @@ def install_packages(module, packages, package_files):
     install_c = 0
 
     for i, package in enumerate(packages):
-        if query_package(module, package):
+        # if the package is installed and up-to-date then skip
+        installed, updated = query_package(module, package)
+        if installed and updated:
             continue
 
         if package_files[i]: