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Systemd/src/shared/pretty-print.c

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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"
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);
}
static int guess_type(const char **name, char ***prefixes, bool *is_collection, const char **extension) {
/* Try to figure out if name is like tmpfiles.d/ or systemd/system-presets/,
* i.e. a collection of directories without a main config file. */
_cleanup_free_ char *n = NULL;
bool usr = false, run = false, coll = false;
const char *ext = ".conf";
/* This is static so that the array doesn't get deallocated when we exit the function */
static const char* const std_prefixes[] = { CONF_PATHS(""), NULL };
static const char* const usr_prefixes[] = { CONF_PATHS_USR(""), NULL };
static const char* const run_prefixes[] = { "/run/", NULL };
if (path_equal(*name, "environment.d"))
/* Special case: we need to include /etc/environment in the search path, even
* though the whole concept is called environment.d. */
*name = "environment";
n = strdup(*name);
if (!n)
return log_oom();
/* All systemd-style config files should support the /usr-/etc-/run split and
* dropins. Let's add a blanket rule that allows us to support them without keeping
* an explicit list. */
if (path_startswith(n, "systemd") && endswith(n, ".conf"))
usr = true;
delete_trailing_chars(n, "/");
if (endswith(n, ".d"))
coll = true;
if (path_equal(n, "environment"))
usr = true;
if (path_equal(n, "udev/hwdb.d"))
ext = ".hwdb";
if (path_equal(n, "udev/rules.d"))
ext = ".rules";
if (path_equal(n, "kernel/install.d"))
ext = ".install";
if (path_equal(n, "systemd/ntp-units.d")) {
coll = true;
ext = ".list";
}
if (path_equal(n, "systemd/relabel-extra.d")) {
coll = run = true;
ext = ".relabel";
}
if (PATH_IN_SET(n, "systemd/system-preset", "systemd/user-preset")) {
coll = true;
ext = ".preset";
}
if (path_equal(n, "systemd/user-preset"))
usr = true;
*prefixes = (char**) (usr ? usr_prefixes : run ? run_prefixes : std_prefixes);
*is_collection = coll;
*extension = ext;
return 0;
}
int conf_files_cat(const char *root, const char *name) {
_cleanup_strv_free_ char **dirs = NULL, **files = NULL;
_cleanup_free_ char *path = NULL;
char **prefixes, **prefix;
bool is_collection;
const char *extension;
char **t;
int r;
r = guess_type(&name, &prefixes, &is_collection, &extension);
if (r < 0)
return r;
STRV_FOREACH(prefix, prefixes) {
assert(endswith(*prefix, "/"));
r = strv_extendf(&dirs, "%s%s%s", *prefix, name,
is_collection ? "" : ".d");
if (r < 0)
return log_error_errno(r, "Failed to build directory list: %m");
}
r = conf_files_list_strv(&files, extension, root, 0, (const char* const*) dirs);
if (r < 0)
return log_error_errno(r, "Failed to query file list: %m");
if (!is_collection) {
path = path_join(root, "/etc", name);
if (!path)
return log_oom();
}
if (DEBUG_LOGGING) {
log_debug("Looking for configuration in:");
if (path)
log_debug(" %s", path);
STRV_FOREACH(t, dirs)
log_debug(" %s/*%s", *t, extension);
}
/* show */
return cat_files(path, files, CAT_FLAGS_MAIN_FILE_OPTIONAL);
}
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