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nspawn: optionally tint the background color of a container

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This commit is contained in:
Lennart Poettering 2024-01-19 23:41:01 +01:00
parent 9ebd1153ef
commit 3d8ba7b83f
3 changed files with 35 additions and 4 deletions
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15
man/systemd-nspawn.xml
View file

@ -1711,6 +1711,21 @@ After=sys-subsystem-net-devices-ens1.device</programlisting>
<xi:include href="version-info.xml" xpointer="v242"/></listitem>
</varlistentry>
<varlistentry>
<term><option>--background=<replaceable>COLOR</replaceable></option></term>
<listitem><para>Change the terminal background color to the specified ANSI color as long as the
container runs. The color specified should be an ANSI X3.64 SGR background color, i.e. strings such
as <literal>40</literal>, <literal>41</literal>, …, <literal>47</literal>, <literal>48;2;…</literal>,
<literal>48;5;…</literal>. See <ulink
url="https://en.wikipedia.org/wiki/ANSI_escape_code#SGR_(Select_Graphic_Rendition)_parameters">ANSI
Escape Code (Wikipedia)</ulink> for details. Assign an empty string to disable any coloring.</para>
<xi:include href="version-info.xml" xpointer="v256"/>
</listitem>
</varlistentry>
</variablelist>
</refsect2>

2
shell-completion/bash/systemd-nspawn
View file

@ -73,7 +73,7 @@ _systemd_nspawn() {
--pivot-root --property --private-users --private-users-ownership --network-namespace-path
--network-ipvlan --network-veth-extra --network-zone -p --port --system-call-filter --overlay
--overlay-ro --settings --rlimit --hostname --no-new-privileges --oom-score-adjust --cpu-affinity
--resolv-conf --timezone --root-hash-sig'
--resolv-conf --timezone --root-hash-sig --background'
)
_init_completion || return

22
src/nspawn/nspawn.c
View file

@ -236,6 +236,7 @@ static bool arg_suppress_sync = false;
static char *arg_settings_filename = NULL;
static Architecture arg_architecture = _ARCHITECTURE_INVALID;
static ImagePolicy *arg_image_policy = NULL;
static char *arg_background = NULL;
STATIC_DESTRUCTOR_REGISTER(arg_directory, freep);
STATIC_DESTRUCTOR_REGISTER(arg_template, freep);
@ -272,6 +273,7 @@ STATIC_DESTRUCTOR_REGISTER(arg_sysctl, strv_freep);
STATIC_DESTRUCTOR_REGISTER(arg_bind_user, strv_freep);
STATIC_DESTRUCTOR_REGISTER(arg_settings_filename, freep);
STATIC_DESTRUCTOR_REGISTER(arg_image_policy, image_policy_freep);
STATIC_DESTRUCTOR_REGISTER(arg_background, freep);
static int handle_arg_console(const char *arg) {
if (streq(arg, "help")) {
@ -450,6 +452,7 @@ static int help(void) {
" --console=MODE Select how stdin/stdout/stderr and /dev/console are\n"
" set up for the container.\n"
" -P --pipe Equivalent to --console=pipe\n\n"
" --background=COLOR Set ANSI color for background\n"
"%3$sCredentials:%4$s\n"
" --set-credential=ID:VALUE\n"
" Pass a credential with literal value to container.\n"
@ -745,6 +748,7 @@ static int parse_argv(int argc, char *argv[]) {
ARG_BIND_USER,
ARG_SUPPRESS_SYNC,
ARG_IMAGE_POLICY,
ARG_BACKGROUND,
};
static const struct option options[] = {
@ -819,6 +823,7 @@ static int parse_argv(int argc, char *argv[]) {
{ "bind-user", required_argument, NULL, ARG_BIND_USER },
{ "suppress-sync", required_argument, NULL, ARG_SUPPRESS_SYNC },
{ "image-policy", required_argument, NULL, ARG_IMAGE_POLICY },
{ "background", required_argument, NULL, ARG_BACKGROUND },
{}
};
@ -1608,6 +1613,12 @@ static int parse_argv(int argc, char *argv[]) {
return r;
break;
case ARG_BACKGROUND:
r = free_and_strdup_warn(&arg_background, optarg);
if (r < 0)
return r;
break;
case '?':
return -EINVAL;
@ -5339,9 +5350,14 @@ static int run_container(
return log_error_errno(r, "Failed to create PTY forwarder: %m");
if (arg_console_width != UINT_MAX || arg_console_height != UINT_MAX)
(void) pty_forward_set_width_height(forward,
arg_console_width,
arg_console_height);
(void) pty_forward_set_width_height(
forward,
arg_console_width,
arg_console_height);
if (!isempty(arg_background))
(void) pty_forward_set_background_color(forward, arg_background);
break;
default: