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/* SPDX-License-Identifier: LGPL-2.1+ */
#include <sys/utsname.h>
#include <errno.h>
#include <stdio.h>
#include "alloc-util.h"
#include "conf-files.h"
#include "def.h"
#include "env-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "pager.h"
#include "path-util.h"
#include "pretty-print.h"
#include "string-util.h"
#include "strv.h"
#include "terminal-util.h"
#include "util.h"
static bool urlify_enabled(void) {
static int cached_urlify_enabled = -1;
/* Unfortunately 'less' doesn't support links like this yet 😭, hence let's disable this as long as there's a
* pager in effect. Let's drop this check as soon as less got fixed a and enough time passed so that it's safe
* to assume that a link-enabled 'less' version has hit most installations. */
if (cached_urlify_enabled < 0) {
int val;
val = getenv_bool("SYSTEMD_URLIFY");
if (val >= 0)
cached_urlify_enabled = val;
else
cached_urlify_enabled = colors_enabled() && !pager_have();
}
return cached_urlify_enabled;
}
int terminal_urlify(const char *url, const char *text, char **ret) {
char *n;
assert(url);
/* Takes an URL and a pretty string and formats it as clickable link for the terminal. See
* https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda for details. */
if (isempty(text))
text = url;
if (urlify_enabled())
n = strjoin("\x1B]8;;", url, "\a", text, "\x1B]8;;\a");
else
n = strdup(text);
if (!n)
return -ENOMEM;
*ret = n;
return 0;
}
int file_url_from_path(const char *path, char **ret) {
_cleanup_free_ char *absolute = NULL;
struct utsname u;
char *url = NULL;
int r;
if (uname(&u) < 0)
return -errno;
if (!path_is_absolute(path)) {
r = path_make_absolute_cwd(path, &absolute);
if (r < 0)
return r;
path = absolute;
}
/* As suggested by https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda, let's include the local
* hostname here. Note that we don't use gethostname_malloc() or gethostname_strict() since we are interested
* in the raw string the kernel has set, whatever it may be, under the assumption that terminals are not overly
* careful with validating the strings either. */
url = strjoin("file://", u.nodename, path);
if (!url)
return -ENOMEM;
*ret = url;
return 0;
}
int terminal_urlify_path(const char *path, const char *text, char **ret) {
_cleanup_free_ char *url = NULL;
int r;
assert(path);
/* Much like terminal_urlify() above, but takes a file system path as input
* and turns it into a proper file:// URL first. */
if (isempty(path))
return -EINVAL;
if (isempty(text))
text = path;
if (!urlify_enabled()) {
char *n;
n = strdup(text);
if (!n)
return -ENOMEM;
*ret = n;
return 0;
}
r = file_url_from_path(path, &url);
if (r < 0)
return r;
return terminal_urlify(url, text, ret);
}
int terminal_urlify_man(const char *page, const char *section, char **ret) {
const char *url, *text;
url = strjoina("man:", page, "(", section, ")");
text = strjoina(page, "(", section, ") man page");
return terminal_urlify(url, text, ret);
}
static int cat_file(const char *filename, bool newline) {
_cleanup_fclose_ FILE *f = NULL;
_cleanup_free_ char *urlified = NULL;
int r;
f = fopen(filename, "re");
if (!f)
return -errno;
r = terminal_urlify_path(filename, NULL, &urlified);
if (r < 0)
return r;
printf("%s%s# %s%s\n",
newline ? "\n" : "",
ansi_highlight_blue(),
urlified,
ansi_normal());
fflush(stdout);
for (;;) {
_cleanup_free_ char *line = NULL;
r = read_line(f, LONG_LINE_MAX, &line);
if (r < 0)
return log_error_errno(r, "Failed to read \"%s\": %m", filename);
if (r == 0)
break;
puts(line);
}
return 0;
}
int cat_files(const char *file, char **dropins, CatFlags flags) {
char **path;
int r;
if (file) {
r = cat_file(file, false);
if (r == -ENOENT && (flags & CAT_FLAGS_MAIN_FILE_OPTIONAL))
printf("%s# config file %s not found%s\n",
ansi_highlight_magenta(),
file,
ansi_normal());
else if (r < 0)
return log_warning_errno(r, "Failed to cat %s: %m", file);
}
STRV_FOREACH(path, dropins) {
r = cat_file(*path, file || path != dropins);
if (r < 0)
return log_warning_errno(r, "Failed to cat %s: %m", *path);
}
return 0;
}
void print_separator(void) {
/* Outputs a separator line that resolves to whitespace when copied from the terminal. We do that by outputting
* one line filled with spaces with ANSI underline set, followed by a second (empty) line. */
if (underline_enabled()) {
size_t i, c;
c = columns();
flockfile(stdout);
fputs_unlocked(ANSI_UNDERLINE, stdout);
for (i = 0; i < c; i++)
fputc_unlocked(' ', stdout);
fputs_unlocked(ANSI_NORMAL "\n\n", stdout);
funlockfile(stdout);
} else
fputs("\n\n", stdout);
}
int conf_files_cat(const char *root, const char *name) {
_cleanup_strv_free_ char **dirs = NULL, **files = NULL;
_cleanup_free_ char *path = NULL;
const char *dir;
char **t;
int r;
NULSTR_FOREACH(dir, CONF_PATHS_NULSTR("")) {
assert(endswith(dir, "/"));
r = strv_extendf(&dirs, "%s%s.d", dir, name);
if (r < 0)
return log_error_errno(r, "Failed to build directory list: %m");
}
r = conf_files_list_strv(&files, ".conf", root, 0, (const char* const*) dirs);
if (r < 0)
return log_error_errno(r, "Failed to query file list: %m");
path = path_join(root, "/etc", name);
if (!path)
return log_oom();
if (DEBUG_LOGGING) {
log_debug("Looking for configuration in:");
log_debug(" %s", path);
STRV_FOREACH(t, dirs)
log_debug(" %s/*.conf", *t);
}
/* show */
return cat_files(path, files, CAT_FLAGS_MAIN_FILE_OPTIONAL);
}
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