Zbigniew Jędrzejewski-Szmek
baa6a42d27
I changed imports of util.h to initrd-util.h, or added an import of initrd-util.h, to keep compilation working. It turns out that many files didn't import util.h directly. When viewing the patch, don't be confused by git rename detection logic: a new .c file is added and two functions moved into it.
76 lines
2.3 KiB
C
76 lines
2.3 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <unistd.h>
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#include "env-util.h"
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#include "initrd-util.h"
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#include "parse-util.h"
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#include "stat-util.h"
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#include "string-util.h"
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static int saved_in_initrd = -1;
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bool in_initrd(void) {
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int r;
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const char *e;
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bool lenient = false;
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if (saved_in_initrd >= 0)
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return saved_in_initrd;
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/* We have two checks here:
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*
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* 1. the flag file /etc/initrd-release must exist
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* 2. the root file system must be a memory file system
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*
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* The second check is extra paranoia, since misdetecting an
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* initrd can have bad consequences due the initrd
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* emptying when transititioning to the main systemd.
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*
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* If env var $SYSTEMD_IN_INITRD is not set or set to "auto",
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* both checks are used. If it's set to "lenient", only check
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* 1 is used. If set to a boolean value, then the boolean
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* value is returned.
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*/
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e = secure_getenv("SYSTEMD_IN_INITRD");
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if (e) {
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if (streq(e, "lenient"))
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lenient = true;
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else if (!streq(e, "auto")) {
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r = parse_boolean(e);
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if (r >= 0) {
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saved_in_initrd = r > 0;
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return saved_in_initrd;
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}
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log_debug_errno(r, "Failed to parse $SYSTEMD_IN_INITRD, ignoring: %m");
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}
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}
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if (!lenient) {
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r = path_is_temporary_fs("/");
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if (r < 0)
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log_debug_errno(r, "Couldn't determine if / is a temporary file system: %m");
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saved_in_initrd = r > 0;
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}
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r = access("/etc/initrd-release", F_OK);
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if (r >= 0) {
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if (saved_in_initrd == 0)
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log_debug("/etc/initrd-release exists, but it's not an initrd.");
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else
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saved_in_initrd = 1;
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} else {
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if (errno != ENOENT)
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log_debug_errno(errno, "Failed to test if /etc/initrd-release exists: %m");
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saved_in_initrd = 0;
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}
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return saved_in_initrd;
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}
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void in_initrd_force(bool value) {
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saved_in_initrd = value;
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}
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