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core: improve error message when machine id is missing

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Jan Synacek 2014-10-31 10:16:45 +01:00 committed by Zbigniew Jędrzejewski-Szmek
parent 393b6f28ec
commit 86fb9ca7ae
1 changed files with 12 additions and 5 deletions
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17
src/core/machine-id-setup.c
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@ -162,7 +162,7 @@ static int generate(char id[34], const char *root) {
int machine_id_setup(const char *root) {
const char *etc_machine_id, *run_machine_id;
_cleanup_close_ int fd = -1;
bool writable = false;
bool writable = true;
struct stat st;
char id[34]; /* 32 + \n + \0 */
int r;
@ -186,12 +186,19 @@ int machine_id_setup(const char *root) {
mkdir_parents(etc_machine_id, 0755);
fd = open(etc_machine_id, O_RDWR|O_CREAT|O_CLOEXEC|O_NOCTTY, 0444);
if (fd >= 0)
writable = true;
else {
if (fd < 0) {
int old_errno = errno;
fd = open(etc_machine_id, O_RDONLY|O_CLOEXEC|O_NOCTTY);
if (fd < 0) {
log_error("Cannot open %s: %m", etc_machine_id);
if (old_errno == EROFS && errno == ENOENT)
log_error("System cannot boot: Missing /etc/machine-id and /etc is mounted read-only.\n"
"Booting up is supported only when:\n"
"1) /etc/machine-id exists and is populated.\n"
"2) /etc/machine-id exists and is empty.\n"
"3) /etc/machine-id is missing and /etc is writable.\n");
else
log_error("Cannot open %s: %m", etc_machine_id);
return -errno;
}