boot tool: seletive usage help message

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

diff --git a/bin/proxmox-boot-tool b/bin/proxmox-boot-tool
index 218debe0d135c74a0690770fe33beefabce72cb8..fb4e320f6a5de2f8ff452078034e9c9f67596a67 100755 (executable)
--- a/bin/proxmox-boot-tool
+++ b/bin/proxmox-boot-tool
@@ -302,18 +302,35 @@ list_kernels() {
 }
 
 usage() {
-       warn "USAGE: $0 <commands> [ARGS]"
-       warn ""
-       warn "       $0 format <partition> [--force]"
-       warn "       $0 init <partition>"
-       warn "       $0 clean [--dry-run]"
-       warn "       $0 refresh [--hook <name>]"
-       warn "       $0 kernel <add|remove> <kernel-version>"
-       warn "       $0 kernel pin <kernel-version> [--next-boot]"
-       warn "       $0 kernel unpin [--next-boot]"
-       warn "       $0 kernel list"
-       warn "       $0 status [--quiet]"
-       warn "       $0 help"
+       subcmd="$1"
+       if [ -z "$subcmd" ]; then
+               warn "USAGE: $0 <commands> [ARGS]"
+               warn ""
+       fi
+       if [ -z "$subcmd" ] || [ "$subcmd" = "format" ]; then
+               warn "  $0 format <partition> [--force]"
+       fi
+       if [ -z "$subcmd" ] || [ "$subcmd" = "init" ]; then
+               warn "  $0 init <partition>"
+       fi
+       if [ -z "$subcmd" ] || [ "$subcmd" = "clean" ]; then
+               warn "  $0 clean [--dry-run]"
+       fi
+       if [ -z "$subcmd" ] || [ "$subcmd" = "refresh" ]; then
+               warn "  $0 refresh [--hook <name>]"
+       fi
+       if [ -z "$subcmd" ] || [ "$subcmd" = "kernel" ]; then
+               warn "  $0 kernel <add|remove> <kernel-version>"
+               warn "  $0 kernel pin <kernel-version> [--next-boot]"
+               warn "  $0 kernel unpin [--next-boot]"
+               warn "  $0 kernel list"
+       fi
+       if [ -z "$subcmd" ] || [ "$subcmd" = "status" ]; then
+               warn "  $0 status [--quiet]"
+       fi
+       if [ -z "$subcmd" ] || [ "$subcmd" = "help" ]; then
+               warn "  $0 help"
+       fi
 }
 
 help() {
@@ -492,7 +509,7 @@ case "$1" in
                if [ -z "$1"  ]; then
                        warn "E: <partition> is mandatory."
                        warn ""
-                       usage
+                       usage "format"
                        exit 1
                fi
                format "$@"
@@ -504,7 +521,7 @@ case "$1" in
                if [ -z "$1"  ]; then
                        warn "E: <partition> is mandatory."
                        warn ""
-                       usage
+                       usage "init"
                        exit 1
                fi
                init "$@"
@@ -522,7 +539,7 @@ case "$1" in
                elif [ "$#" -eq 2 ] && [ "$1" = "--hook" ]; then
                        refresh "$2"
                else
-                       usage
+                       usage "refresh"
                        exit 1
                fi
                exit 0
@@ -532,7 +549,7 @@ case "$1" in
                if [ -z "$1" ]; then
                        warn "E: subcommand is mandatory for 'kernel'."
                        warn ""
-                       usage
+                       usage "kernel"
                        exit 1
                fi
                cmd="$1"
@@ -555,7 +572,7 @@ case "$1" in
                                elif [ "$#" -eq 2 ]; then
                                        pin_kernel "$2"
                                else
-                                       usage
+                                       usage "kernel"
                                        exit 1
                                fi
                                exit 0
@@ -566,7 +583,7 @@ case "$1" in
                                elif [ "$#" -eq 1 ]; then
                                        unpin_kernel
                                else
-                                       usage
+                                       usage "kernel"
                                        exit 1
                                fi
                                exit 0
@@ -574,7 +591,7 @@ case "$1" in
                        *)
                                warn "E: invalid 'kernel' subcommand '$cmd'."
                                warn ""
-                               usage
+                               usage "kernel"
                                exit 1
                        ;;
                esac
@@ -588,7 +605,7 @@ case "$1" in
                        shift
                        status
                else
-                       usage
+                       usage "status"
                        exit 1
                fi
                exit 0