support: simplify, user must use sudo for full logs

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

doc/support.md

@@ -5,14 +5,20 @@ provides a convenient way to collect comprehensive system diagnostics.
 This command gathers configuration files, logs, network state, and other
 system information into a single compressed archive.
 
+> [!NOTE]
+> The `support collect` command should be run with `sudo` to collect
+> complete system information (kernel logs, hardware details, etc.).
+> Use the `--unprivileged` option to run as a regular user in degraded
+> data collection mode.
+
 ## Collecting Support Data
 
 To collect support data and save it to a file:
 
 ```bash
-admin@host:~$ support collect > support-data.tar.gz
-(admin@host) Password: ***********
+admin@host:~$ sudo support collect > support-data.tar.gz
 Starting support data collection from host...
+Collecting to: /var/lib/support
 This may take up to a minute. Please wait...
 Tailing /var/log/messages for 30 seconds (please wait)...
 Log tail complete.
@@ -24,7 +30,7 @@ admin@host:~$ ls -l support-data.tar.gz
 The command can also be run remotely via SSH from your workstation:
 
 ```bash
-$ ssh admin@host support collect > support-data.tar.gz
+$ ssh admin@host 'sudo support collect' > support-data.tar.gz
 ...
 ```
 
@@ -38,8 +44,9 @@ For secure transmission of support data, the archive can be encrypted
 with GPG using a password:
 
 ```bash
-admin@host:~$ support collect -p mypassword > support-data.tar.gz.gpg
+admin@host:~$ sudo support collect -p mypassword > support-data.tar.gz.gpg
 Starting support data collection from host...
+Collecting to: /var/lib/support
 This may take up to a minute. Please wait...
 ...
 Collection complete. Creating archive...
@@ -53,7 +60,7 @@ but the local ssh client may then echo the password.
 > [!TIP]
 > To hide the encryption password for an SSH session, the script supports
 > reading from stdin:
-> `echo "$MYSECRET" | ssh user@device support collect -p >
+> `echo "$MYSECRET" | ssh user@device 'sudo support collect -p' >
 > file.tar.gz.gpg`
 
 After transferring the resulting file to your workstation, decrypt it

src/bin/support

@@ -96,20 +96,12 @@ cmd_collect()
                 ;;
             *)
                 echo "Error: Unknown option '$1'" >&2
-                echo "Usage: $prognm collect [--log-sec|-s N] [--password|-p PASSWORD]" >&2
+                echo "Usage: $prognm collect [-s N] [-p PASSWORD]" >&2
                 exit 1
                 ;;
         esac
     done
 
-    # Determine if we need sudo and if it's available
-    SUDO=""
-    if [ "$(id -u)" -ne 0 ]; then
-        if command -v sudo >/dev/null 2>&1; then
-            SUDO="sudo"
-        fi
-    fi
-
     # If WORK_DIR not set globally, try /var/lib/support first (more space,
     # persistent across user sessions). Fall back to $HOME if we can't create/write there
     if [ -z "$WORK_DIR" ]; then
@@ -120,15 +112,12 @@ cmd_collect()
             # Doesn't exist, try to create it
             if mkdir -p /var/lib/support 2>/dev/null; then
                 WORK_DIR="/var/lib/support"
-            elif [ -n "$SUDO" ] && $SUDO mkdir -p /var/lib/support 2>/dev/null && \
-                 $SUDO chown "$(id -u):$(id -g)" /var/lib/support 2>/dev/null; then
-                WORK_DIR="/var/lib/support"
             fi
         elif [ -d /var/lib/support ]; then
-            # Exists but not writable, try to fix permissions with sudo
+            # Exists but not writable, try to fix permissions (requires root)
             # Try chmod first (might just be permission issue), then chown if needed
-            if $SUDO chmod 755 /var/lib/support 2>/dev/null && \
-               $SUDO chown "$(id -u):$(id -g)" /var/lib/support 2>/dev/null; then
+            if chmod 755 /var/lib/support 2>/dev/null && \
+               chown "$(id -u):$(id -g)" /var/lib/support 2>/dev/null; then
                 # Verify it's actually writable now
                 if [ -w /var/lib/support ] 2>/dev/null; then
                     WORK_DIR="/var/lib/support"
@@ -272,7 +261,7 @@ cmd_collect()
     fi
 
     # Kernel and system state
-    collect system/dmesg.txt    ${SUDO} dmesg
+    collect system/dmesg.txt    dmesg
     collect system/free.txt     free -h
     collect system/stat.txt     cat /proc/stat
     collect system/softirqs.txt cat /proc/softirqs
@@ -316,10 +305,10 @@ cmd_collect()
         ip -o link show | grep 'link/ether' | awk -F': ' '{print $2}' > "${COLLECT_DIR}/.iface-list" 2>> "${EXEC_LOG}"
         if [ -s "${COLLECT_DIR}/.iface-list" ]; then
             while IFS= read -r iface; do
-                # ethtool typically needs root/sudo
-                collect "network/ethtool/${iface}.txt"       ${SUDO} ethtool "$iface"
-                collect "network/ethtool/stats-${iface}.txt" ${SUDO} ethtool -S "$iface"
-                collect "network/ethtool/module-${iface}.txt" ${SUDO} ethtool -m "$iface"
+                # ethtool typically needs root
+                collect "network/ethtool/${iface}.txt"        ethtool    "$iface"
+                collect "network/ethtool/stats-${iface}.txt"  ethtool -S "$iface"
+                collect "network/ethtool/module-${iface}.txt" ethtool -m "$iface"
             done < "${COLLECT_DIR}/.iface-list"
         fi
         rm -f "${COLLECT_DIR}/.iface-list"
@@ -332,7 +321,7 @@ cmd_collect()
 
     # Firewall rules
     if command -v nft >/dev/null 2>&1; then
-        collect network/nftables.txt ${SUDO} nft list ruleset
+        collect network/nftables.txt nft list ruleset
     fi
 
     # FRR routing information
@@ -548,7 +537,10 @@ usage()
 {
     echo "Usage: $prognm [global-options] <command> [options]"
     echo ""
+    echo "Note: Run with 'sudo' for complete data collection (dmesg, ethtool, etc.)"
+    echo ""
     echo "Global options:"
+    echo "  -u, --unprivileged     Allow running without root (some data will be missing)"
     echo "  -w, --work-dir PATH    Use PATH as working directory for collection/cleanup"
     echo "                         (default: /var/lib/support with fallback to \$HOME)"
     echo ""
@@ -568,23 +560,29 @@ usage()
     echo "  -d, --days N           Remove directories older than N days (default: 7)"
     echo ""
     echo "Examples:"
-    echo "  $prognm collect                     > support-data.tar.gz"
-    echo "  $prognm collect -p                  > support-data.tar.gz.gpg"
-    echo "  $prognm collect --password mypass   > support-data.tar.gz.gpg"
-    echo "  $prognm --work-dir /tmp/ram collect > support-data.tar.gz"
-    echo "  ssh user@device $prognm collect     > support-data.tar.gz"
-    echo "  $prognm clean --dry-run"
-    echo "  $prognm clean --days 30"
-    echo "  $prognm --work-dir /tmp/ram clean"
+    echo "  sudo $prognm collect                        > support-data.tar.gz"
+    echo "  sudo $prognm collect -p                     > support-data.tar.gz.gpg"
+    echo "  sudo $prognm collect --password mypass      > support-data.tar.gz.gpg"
+    echo "  sudo $prognm --work-dir /tmp/ram collect    > support-data.tar.gz"
+    echo "  ssh user@device 'sudo $prognm collect'      > support-data.tar.gz"
+    echo "  $prognm -u collect                          > support-data.tar.gz (degraded)"
+    echo "  sudo $prognm clean --dry-run"
+    echo "  sudo $prognm clean --days 30"
+    echo "  sudo $prognm --work-dir /tmp/ram clean"
     exit 1
 }
 
 # Main command dispatcher
 # Parse global options first
 WORK_DIR=""
+ALLOW_UNPRIVILEGED=0
 
 while [ $# -gt 0 ]; do
     case "$1" in
+        -u|--unprivileged)
+            ALLOW_UNPRIVILEGED=1
+            shift
+            ;;
         -w|--work-dir)
             if [ -z "$2" ]; then
                 echo "Error: --work-dir requires a path argument" >&2
@@ -612,11 +610,19 @@ command="$1"
 shift
 
 case "$command" in
-    collect)
+    collect|clean)
+        # Check if running as root (uid 0)
+        if [ "$(id -u)" -ne 0 ] && [ "$ALLOW_UNPRIVILEGED" -eq 0 ]; then
+            echo "Error: This command should be run with 'sudo' for complete data collection." >&2
+            echo "       Use -u/--unprivileged to run as a regular user in degraded mode." >&2
+            exit 1
+        fi
+
+        if [ "$command" = "collect" ]; then
             cmd_collect "$@"
-        ;;
-    clean)
+        else
             cmd_clean "$@"
+        fi
         ;;
     help|--help|-h)
         usage