129 lines
4 KiB
C
129 lines
4 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include "alloc-util.h"
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#include "fd-util.h"
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#include "io-util.h"
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#include "parse-util.h"
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#include "show-status.h"
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#include "string-table.h"
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#include "string-util.h"
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#include "terminal-util.h"
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#include "util.h"
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static const char* const show_status_table[_SHOW_STATUS_MAX] = {
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[SHOW_STATUS_NO] = "no",
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[SHOW_STATUS_ERROR] = "error",
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[SHOW_STATUS_AUTO] = "auto",
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[SHOW_STATUS_TEMPORARY] = "temporary",
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[SHOW_STATUS_YES] = "yes",
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};
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DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(show_status, ShowStatus, SHOW_STATUS_YES);
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int parse_show_status(const char *v, ShowStatus *ret) {
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ShowStatus s;
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assert(ret);
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s = show_status_from_string(v);
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if (s < 0 || s == SHOW_STATUS_TEMPORARY)
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return -EINVAL;
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*ret = s;
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return 0;
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}
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int status_vprintf(const char *status, ShowStatusFlags flags, const char *format, va_list ap) {
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static const char status_indent[] = " "; /* "[" STATUS "] " */
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_cleanup_free_ char *s = NULL;
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_cleanup_close_ int fd = -1;
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struct iovec iovec[7] = {};
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int n = 0;
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static bool prev_ephemeral;
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assert(format);
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/* This is independent of logging, as status messages are
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* optional and go exclusively to the console. */
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if (vasprintf(&s, format, ap) < 0)
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return log_oom();
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/* Before you ask: yes, on purpose we open/close the console for each status line we write individually. This
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* is a good strategy to avoid PID 1 getting killed by the kernel's SAK concept (it doesn't fix this entirely,
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* but minimizes the time window the kernel might end up killing PID 1 due to SAK). It also makes things easier
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* for us so that we don't have to recover from hangups and suchlike triggered on the console. */
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fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
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if (fd < 0)
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return fd;
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if (FLAGS_SET(flags, SHOW_STATUS_ELLIPSIZE)) {
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char *e;
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size_t emax, sl;
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int c;
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c = fd_columns(fd);
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if (c <= 0)
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c = 80;
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sl = status ? sizeof(status_indent)-1 : 0;
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emax = c - sl - 1;
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if (emax < 3)
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emax = 3;
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e = ellipsize(s, emax, 50);
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if (e)
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free_and_replace(s, e);
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}
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if (prev_ephemeral)
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iovec[n++] = IOVEC_MAKE_STRING(ANSI_REVERSE_LINEFEED "\r" ANSI_ERASE_TO_END_OF_LINE);
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if (status) {
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if (!isempty(status)) {
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iovec[n++] = IOVEC_MAKE_STRING("[");
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iovec[n++] = IOVEC_MAKE_STRING(status);
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iovec[n++] = IOVEC_MAKE_STRING("] ");
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} else
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iovec[n++] = IOVEC_MAKE_STRING(status_indent);
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}
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iovec[n++] = IOVEC_MAKE_STRING(s);
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iovec[n++] = IOVEC_MAKE_STRING("\n");
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if (prev_ephemeral && !FLAGS_SET(flags, SHOW_STATUS_EPHEMERAL))
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iovec[n++] = IOVEC_MAKE_STRING(ANSI_ERASE_TO_END_OF_LINE);
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prev_ephemeral = FLAGS_SET(flags, SHOW_STATUS_EPHEMERAL) ;
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if (writev(fd, iovec, n) < 0)
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return -errno;
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return 0;
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}
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int status_printf(const char *status, ShowStatusFlags flags, const char *format, ...) {
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va_list ap;
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int r;
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assert(format);
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va_start(ap, format);
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r = status_vprintf(status, flags, format, ap);
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va_end(ap);
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return r;
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}
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static const char* const status_unit_format_table[_STATUS_UNIT_FORMAT_MAX] = {
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[STATUS_UNIT_FORMAT_NAME] = "name",
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[STATUS_UNIT_FORMAT_DESCRIPTION] = "description",
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};
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DEFINE_STRING_TABLE_LOOKUP(status_unit_format, StatusUnitFormat);
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