From 2af6bbac8f6ccb3f8604d70ae47b9eb5056ab843 Mon Sep 17 00:00:00 2001
From: Luca BRUNO <luca.bruno@coreos.com>
Date: Nov 19 2021 17:26:09 +0000
Subject: sysusers/provides: parse and output static IDs


This adds support for parsing static UIDs and GIDs from sysusers.d
fragments, and automatically forwarding them to the generated
'Provides' entries.
It will allow inspecting users/groups with static IDs directly
from package metadata:
```
$ rpm --query --provides --package gdm-41.0-3.fc36.x86_64.rpm
[...]
group(gdm) = 42
user(gdm) = 42
```

---

diff --git a/sysusers.prov b/sysusers.prov
index a6eda5d..f12e929 100755
--- a/sysusers.prov
+++ b/sysusers.prov
@@ -1,5 +1,40 @@
 #!/bin/bash
 
+process_u() {
+    if [ ! -z "${2##*[!0-9]*}" ]; then
+        # Single shared static ID.
+        echo "user($1) = $2"
+        echo "group($1) = $2"
+    elif [[ $2 == *:* ]]; then
+        # UID:<group>.
+        uid=$(echo $2 | cut -d':' -f1 -)
+        group=$(echo $2 | cut -d':' -f2 -)
+        if [ ! -z "${group##*[!0-9]*}" ]; then
+            # UID:GID.
+            echo "user($1) = ${uid}"
+            echo "group($1) = ${group}"
+        else
+            # UID:<groupname>.
+            echo "user($1) = ${uid}"
+            echo "group(${group})"
+        fi
+    else
+        # Dynamic (or something else uninteresting).
+        echo "user($1)"
+        echo "group($1)"
+    fi
+}
+
+process_g() {
+    if [ ! -z "${2##*[!0-9]*}" ]; then
+        # Static GID.
+        echo "group($1) = $2"
+    else
+        # Dynamic (or something else uninteresting).
+        echo "group($1)"
+    fi
+}
+
 parse() {
     while read line; do
         [ "${line:0:1}" = '#' -o "${line:0:1}" = ';' ] && continue
@@ -8,12 +43,10 @@ parse() {
         set -- $line
         case "$1" in
             ('u')
-                echo "user($2)"
-                echo "group($2)"
-                # TODO: user:group support
+                process_u "$2" "$3"
                 ;;
             ('g')
-                echo "group($2)"
+                process_g "$2" "$3"
                 ;;
             ('m')
                 echo "user($2)"