diff options
| -rw-r--r-- | src/system-update-generator/system-update-generator.c | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/src/system-update-generator/system-update-generator.c b/src/system-update-generator/system-update-generator.c index 6ffb169b21..f1514c9638 100644 --- a/src/system-update-generator/system-update-generator.c +++ b/src/system-update-generator/system-update-generator.c @@ -22,6 +22,7 @@ #include "fs-util.h" #include "log.h" +#include "proc-cmdline.h" #include "special.h" #include "string-util.h" #include "util.h" @@ -47,11 +48,27 @@ static int generate_symlink(void) { if (symlink(SYSTEM_DATA_UNIT_PATH "/system-update.target", p) < 0) return log_error_errno(errno, "Failed to create symlink %s: %m", p); + return 1; +} + +static int parse_proc_cmdline_item(const char *key, const char *value, void *data) { + assert(key); + + /* Check if a run level is specified on the kernel command line. The + * command line has higher priority than any on-disk configuration, so + * it'll make any symlink we create moot. + */ + + if (streq(key, "systemd.unit") && !proc_cmdline_value_missing(key, value)) + log_warning("Offline system update overriden by kernel command line systemd.unit= setting"); + else if (!value && runlevel_to_target(key)) + log_warning("Offline system update overriden by runlevel \"%s\" on the kernel command line", key); + return 0; } int main(int argc, char *argv[]) { - int r; + int r, k; if (argc > 1 && argc != 4) { log_error("This program takes three or no arguments."); @@ -69,5 +86,11 @@ int main(int argc, char *argv[]) { r = generate_symlink(); + if (r > 0) { + k = proc_cmdline_parse(parse_proc_cmdline_item, NULL, 0); + if (k < 0) + log_warning_errno(k, "Failed to parse kernel command line, ignoring: %m"); + } + return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; } |