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Merge pull request #25280 from keszybz/initrd-with-overlayfs

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Initrd with overlayfs
This commit is contained in:
Frantisek Sumsal
2022-11-10 08:22:15 +00:00
committed by GitHub
parent 3a21c554a5 a940f507fb
commit a92401d558
8 changed files with 83 additions and 114 deletions
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src/basic/initrd-util.c
+12 -45
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@@ -3,6 +3,7 @@
#include <unistd.h>
#include "env-util.h"
#include "errno-util.h"
#include "initrd-util.h"
#include "parse-util.h"
#include "stat-util.h"
@@ -12,59 +13,25 @@ static int saved_in_initrd = -1;
bool in_initrd(void) {
int r;
const char *e;
bool lenient = false;
if (saved_in_initrd >= 0)
return saved_in_initrd;
/* We have two checks here:
*
* 1. the flag file /etc/initrd-release must exist
* 2. the root file system must be a memory file system
*
* The second check is extra paranoia, since misdetecting an
* initrd can have bad consequences due the initrd
* emptying when transititioning to the main systemd.
*
* If env var $SYSTEMD_IN_INITRD is not set or set to "auto",
* both checks are used. If it's set to "lenient", only check
* 1 is used. If set to a boolean value, then the boolean
* value is returned.
/* If /etc/initrd-release exists, we're in an initrd.
* This can be overridden by setting SYSTEMD_IN_INITRD=0|1.
*/
e = secure_getenv("SYSTEMD_IN_INITRD");
if (e) {
if (streq(e, "lenient"))
lenient = true;
else if (!streq(e, "auto")) {
r = parse_boolean(e);
if (r >= 0) {
saved_in_initrd = r > 0;
return saved_in_initrd;
}
log_debug_errno(r, "Failed to parse $SYSTEMD_IN_INITRD, ignoring: %m");
}
}
if (!lenient) {
r = path_is_temporary_fs("/");
if (r < 0)
log_debug_errno(r, "Couldn't determine if / is a temporary file system: %m");
r = getenv_bool_secure("SYSTEMD_IN_INITRD");
if (r < 0 && r != -ENXIO)
log_debug_errno(r, "Failed to parse $SYSTEMD_IN_INITRD, ignoring: %m");
if (r >= 0)
saved_in_initrd = r > 0;
}
r = access("/etc/initrd-release", F_OK);
if (r >= 0) {
if (saved_in_initrd == 0)
log_debug("/etc/initrd-release exists, but it's not an initrd.");
else
saved_in_initrd = 1;
} else {
if (errno != ENOENT)
log_debug_errno(errno, "Failed to test if /etc/initrd-release exists: %m");
saved_in_initrd = 0;
else {
r = RET_NERRNO(access("/etc/initrd-release", F_OK));
if (r < 0 && r != -ENOENT)
log_debug_errno(r, "Failed to check if /etc/initrd-release exists, assuming it does not: %m");
saved_in_initrd = r >= 0;
}
return saved_in_initrd;