Add tool to display emergency log message full-screen on boot failure.
This commit is contained in:
OMOJOLA JOSHUA
committed by
Luca Boccassi
Luca Boccassi
parent
5a087ba25c
commit
fc7eb1325b
+136
-34
@@ -36,60 +36,138 @@ int dlopen_qrencode(void) {
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return r;
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}
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static void print_border(FILE *output, unsigned width) {
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/* Four rows of border */
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for (unsigned y = 0; y < 4; y += 2) {
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fputs(ANSI_WHITE_ON_BLACK, output);
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static void print_border(FILE *output, unsigned width, unsigned row, unsigned column) {
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assert(output);
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assert(width);
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for (unsigned x = 0; x < 4 + width + 4; x++)
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fputs(UNICODE_FULL_BLOCK, output);
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if (row != UINT_MAX && column != UINT_MAX) {
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int r, fd;
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fputs(ANSI_NORMAL "\n", output);
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fd = fileno(output);
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if (fd < 0)
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return (void)log_debug_errno(errno, "Failed to get file descriptor from the file stream: %m");
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r = set_terminal_cursor_position(fd, row, column);
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if (r < 0)
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log_warning_errno(r, "Failed to move terminal cursor position, ignoring: %m");
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/* Four rows of border */
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for (unsigned y = 0; y < 4; y += 2) {
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fputs(ANSI_WHITE_ON_BLACK, output);
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for (unsigned x = 0; x < 4 + width + 4; x++)
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fputs(UNICODE_FULL_BLOCK, output);
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fputs(ANSI_NORMAL "\n", output);
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r = set_terminal_cursor_position(fd, row + 1, column);
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if (r < 0)
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log_warning_errno(r, "Failed to move terminal cursor position, ignoring: %m");
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}
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} else {
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/* Four rows of border */
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for (unsigned y = 0; y < 4; y += 2) {
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fputs(ANSI_WHITE_ON_BLACK, output);
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for (unsigned x = 0; x < 4 + width + 4; x++)
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fputs(UNICODE_FULL_BLOCK, output);
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fputs(ANSI_NORMAL "\n", output);
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}
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}
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}
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static void write_qrcode(FILE *output, QRcode *qr) {
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static void write_qrcode(FILE *output, QRcode *qr, unsigned int row, unsigned int column) {
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assert(qr);
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if (!output)
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output = stdout;
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print_border(output, qr->width);
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print_border(output, qr->width, row, column);
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for (unsigned y = 0; y < (unsigned) qr->width; y += 2) {
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const uint8_t *row1 = qr->data + qr->width * y;
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const uint8_t *row2 = row1 + qr->width;
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if (row != UINT_MAX && column != UINT_MAX) {
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/* After printing two rows of top border, we need to move the cursor down two rows before starting to print the actual QR code */
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int r, fd, move_down = 2;
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fd = fileno(output);
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if (fd < 0)
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return (void)log_debug_errno(errno, "Failed to get file descriptor from the file stream: %m");
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fputs(ANSI_WHITE_ON_BLACK, output);
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for (unsigned x = 0; x < 4; x++)
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fputs(UNICODE_FULL_BLOCK, output);
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r = set_terminal_cursor_position(fd, row + move_down, column);
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if (r < 0)
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log_warning_errno(r, "Failed to move terminal cursor position, ignoring: %m");
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for (unsigned x = 0; x < (unsigned) qr->width; x++) {
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bool a, b;
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for (unsigned y = 0; y < (unsigned) qr->width; y += 2) {
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const uint8_t *row1 = qr->data + qr->width * y;
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const uint8_t *row2 = row1 + qr->width;
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a = row1[x] & 1;
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b = (y+1) < (unsigned) qr->width ? (row2[x] & 1) : false;
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fputs(ANSI_WHITE_ON_BLACK, output);
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if (a && b)
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fputc(' ', output);
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else if (a)
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fputs(UNICODE_LOWER_HALF_BLOCK, output);
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else if (b)
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fputs(UNICODE_UPPER_HALF_BLOCK, output);
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else
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for (unsigned x = 0; x < 4; x++)
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fputs(UNICODE_FULL_BLOCK, output);
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for (unsigned x = 0; x < (unsigned) qr->width; x++) {
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bool a, b;
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a = row1[x] & 1;
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b = (y+1) < (unsigned) qr->width ? (row2[x] & 1) : false;
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if (a && b)
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fputc(' ', output);
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else if (a)
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fputs(UNICODE_LOWER_HALF_BLOCK, output);
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else if (b)
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fputs(UNICODE_UPPER_HALF_BLOCK, output);
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else
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fputs(UNICODE_FULL_BLOCK, output);
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}
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for (unsigned x = 0; x < 4; x++)
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fputs(UNICODE_FULL_BLOCK, output);
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r = set_terminal_cursor_position(fd, row + move_down, column);
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if (r < 0)
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log_warning_errno(r, "Failed to move terminal cursor position, ignoring: %m");
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move_down += 1;
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fputs(ANSI_NORMAL "\n", output);
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}
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for (unsigned x = 0; x < 4; x++)
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fputs(UNICODE_FULL_BLOCK, output);
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fputs(ANSI_NORMAL "\n", output);
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print_border(output, qr->width, row + move_down, column);
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} else {
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for (unsigned y = 0; y < (unsigned) qr->width; y += 2) {
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const uint8_t *row1 = qr->data + qr->width * y;
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const uint8_t *row2 = row1 + qr->width;
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fputs(ANSI_WHITE_ON_BLACK, output);
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for (unsigned x = 0; x < 4; x++)
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fputs(UNICODE_FULL_BLOCK, output);
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for (unsigned x = 0; x < (unsigned) qr->width; x++) {
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bool a, b;
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a = row1[x] & 1;
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b = (y+1) < (unsigned) qr->width ? (row2[x] & 1) : false;
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if (a && b)
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fputc(' ', output);
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else if (a)
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fputs(UNICODE_LOWER_HALF_BLOCK, output);
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else if (b)
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fputs(UNICODE_UPPER_HALF_BLOCK, output);
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else
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fputs(UNICODE_FULL_BLOCK, output);
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}
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for (unsigned x = 0; x < 4; x++)
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fputs(UNICODE_FULL_BLOCK, output);
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fputs(ANSI_NORMAL "\n", output);
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}
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print_border(output, qr->width, row, column);
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}
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print_border(output, qr->width);
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fflush(output);
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}
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int print_qrcode(FILE *out, const char *header, const char *string) {
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int print_qrcode_full(FILE *out, const char *header, const char *string, unsigned row, unsigned column, unsigned tty_width, unsigned tty_height) {
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QRcode* qr;
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int r;
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@@ -106,10 +184,34 @@ int print_qrcode(FILE *out, const char *header, const char *string) {
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if (!qr)
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return -ENOMEM;
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if (header)
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fprintf(out, "\n%s:\n\n", header);
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if (row != UINT_MAX && column != UINT_MAX) {
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int fd;
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unsigned qr_code_width, qr_code_height;
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fd = fileno(out);
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if (fd < 0)
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return log_debug_errno(errno, "Failed to get file descriptor from the file stream: %m");
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qr_code_width = qr_code_height = qr->width + 8;
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write_qrcode(out, qr);
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if (column + qr_code_width > tty_width)
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column = tty_width - qr_code_width;
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/* Terminal characters are twice as high as they are wide so it's qr_code_height / 2,
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* our QR code prints an extra new line, so we have -1 as well */
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if (row + qr_code_height > tty_height)
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row = tty_height - (qr_code_height / 2 ) - 1;
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if (header) {
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r = set_terminal_cursor_position(fd, row - 2, tty_width - qr_code_width - 2);
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if (r < 0)
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log_warning_errno(r, "Failed to move terminal cursor position, ignoring: %m");
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fprintf(out, "%s:\n\n", header);
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}
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} else
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if (header)
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fprintf(out, "\n%s:\n\n", header);
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write_qrcode(out, qr, row, column);
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fputc('\n', out);
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@@ -3,12 +3,19 @@
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#pragma once
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#include <stdio.h>
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#include <errno.h>
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#include <limits.h>
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#if HAVE_QRENCODE
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int dlopen_qrencode(void);
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int print_qrcode(FILE *out, const char *header, const char *string);
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int print_qrcode_full(FILE *out, const char *header, const char *string, unsigned row, unsigned column, unsigned tty_width, unsigned tty_height);
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static inline int print_qrcode(FILE *out, const char *header, const char *string) {
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return print_qrcode_full(out, header, string, UINT_MAX, UINT_MAX, UINT_MAX, UINT_MAX);
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}
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#else
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static inline int print_qrcode_full(FILE *out, const char *header, const char *string, unsigned row, unsigned column, unsigned tty_width, unsigned tty_height) {
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return -EOPNOTSUPP;
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}
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static inline int print_qrcode(FILE *out, const char *header, const char *string) {
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return -EOPNOTSUPP;
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}
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