Add support for gentoo linux

2 files changed, 66 insertions, 0 deletions

diff --git a/tools/inspect_apps.py b/tools/inspect_apps.py
index 613649b..a1a1157 100644
--- a/tools/inspect_apps.py
+++ b/tools/inspect_apps.py
@@ -9,6 +9,7 @@ __all__ = [
     "list_applications_apk",
     "list_applications_dpkg",
     "list_applications_pacman",
+    "list_applications_portage",
     "list_applications_rpm",
     "list_applications_windows"
 ]
@@ -222,6 +223,63 @@ def list_applications_pacman(path):
 
 
 @log
+def list_applications_portage(path):
+    """Find all packages installed on the linux distribution Gentoo Linux.
+
+    See also:
+    https://wiki.gentoo.org/wiki/Portage
+
+    Args:
+        path (str): Path to the mounted filesystem.
+
+    Returns:
+        List of packages. For example:
+        [{'name': 'sys-devel/bison', 'version': '3.8.2'}, ...]
+    """
+    portage_db = None
+
+    locations = [
+        "var/db/pkg",
+        "db/pkg"  # separated /var partition
+    ]
+
+    for location in locations:
+        db = os.path.join(path, location)
+        if os.path.exists(db):
+            portage_db = db
+            break
+
+    # btrfs?
+    if portage_db is None:
+        for dir in subdirs(path):
+            new_path = os.path.join(path, dir)
+            for location in locations:
+                db = os.path.join(new_path, location)
+                if os.path.exists(db):
+                    portage_db = db
+                    break
+            if portage_db is not None:
+                break
+
+    if portage_db is None:
+        L.debug("portage database not found")
+        return []
+
+    pkgs = []
+    for cat in subdirs(portage_db):
+        for pkg in subdirs(os.path.join(portage_db, cat)):
+            # https://projects.gentoo.org/pms/8/pms.html#x1-150003
+            if m := re.match(r"^(.+)-(\d.*)$", pkg):
+                name, version = m.groups()
+                pkgs.append({
+                    "name": "/".join([cat, name]),
+                    "version": version
+                })
+
+    return pkgs
+
+
+@log
 def list_applications_rpm(path):
     """Find all packages installed on a rpm-based linux distribution.
 
diff --git a/tools/inspect_os.py b/tools/inspect_os.py
index 9848c2e..892ca8a 100644
--- a/tools/inspect_os.py
+++ b/tools/inspect_os.py
@@ -61,6 +61,14 @@ def get_linux_os_info(path):
             # AlmaLinux 8.* and Rocky Linux 8.* also have centos-release.
             if m := re.match(r"^(.*)\srelease\s(.*)$", f.read()):
                 name, version = m.groups()
+    elif "gentoo-release" in release_files:
+        # Gentoo now has a VERSION_ID tag in os-release, which did not exist
+        # before. See also https://bugs.gentoo.org/788190. For consistency,
+        # gentoo-release is parsed before os-release at this point.
+        L.debug("parsing %s", release_files["gentoo-release"])
+        with open(release_files["gentoo-release"]) as f:
+            if m := re.match(r"^(Gentoo).*release\s(.*)$", f.read()):
+                name, version = m.groups()
     elif "os-release" in release_files:
         L.debug("parsing %s", release_files["os-release"])
         with open(release_files["os-release"]) as f: