diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/shared/util.c | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/src/shared/util.c b/src/shared/util.c index 41505b2ca7..8caac7b597 100644 --- a/src/shared/util.c +++ b/src/shared/util.c @@ -54,6 +54,8 @@ #include <glob.h> #include <grp.h> #include <sys/mman.h> +#include <sys/vfs.h> +#include <linux/magic.h> #include "macro.h" #include "util.h" @@ -5738,9 +5740,24 @@ bool is_valid_documentation_url(const char *url) { bool in_initrd(void) { static int saved = -1; + struct statfs s; - if (saved < 0) - saved = access("/etc/initrd-release", F_OK) >= 0; + if (saved >= 0) + return saved; + + /* We make 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 bad consequences due the initrd + * emptying when transititioning to the main systemd. + */ + + saved = access("/etc/initrd-release", F_OK) >= 0 && + statfs("/", &s) >= 0 && + (s.f_type == TMPFS_MAGIC || s.f_type == RAMFS_MAGIC); return saved; } |