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https://github.com/morgan9e/systemd
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efb9b3bab2
The glibc API is behind the wrapper is called "secure_getenv()", hence our wrapper really should keep the order too, otherwise things are just too confusing.
43 lines
1.1 KiB
C
43 lines
1.1 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 "errno-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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if (saved_in_initrd >= 0)
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return saved_in_initrd;
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/* If /etc/initrd-release exists, we're in an initrd.
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* This can be overridden by setting SYSTEMD_IN_INITRD=0|1.
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*/
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r = secure_getenv_bool("SYSTEMD_IN_INITRD");
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if (r < 0 && r != -ENXIO)
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log_debug_errno(r, "Failed to parse $SYSTEMD_IN_INITRD, ignoring: %m");
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if (r >= 0)
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saved_in_initrd = r > 0;
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else {
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r = RET_NERRNO(access("/etc/initrd-release", F_OK));
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if (r < 0 && r != -ENOENT)
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log_debug_errno(r, "Failed to check if /etc/initrd-release exists, assuming it does not: %m");
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saved_in_initrd = r >= 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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