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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 02:25:50 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 02:25:50 +0000 |
commit | 19f4f86bfed21c5326ed2acebe1163f3a83e832b (patch) | |
tree | d59b9989ce55ed23693e80974d94c856f1c2c8b1 /src/system-update-generator/system-update-generator.c | |
parent | Initial commit. (diff) | |
download | systemd-19f4f86bfed21c5326ed2acebe1163f3a83e832b.tar.xz systemd-19f4f86bfed21c5326ed2acebe1163f3a83e832b.zip |
Adding upstream version 241.upstream/241upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/system-update-generator/system-update-generator.c')
-rw-r--r-- | src/system-update-generator/system-update-generator.c | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/src/system-update-generator/system-update-generator.c b/src/system-update-generator/system-update-generator.c new file mode 100644 index 0000000..77e265d --- /dev/null +++ b/src/system-update-generator/system-update-generator.c @@ -0,0 +1,70 @@ +/* SPDX-License-Identifier: LGPL-2.1+ */ + +#include <errno.h> +#include <unistd.h> + +#include "fs-util.h" +#include "generator.h" +#include "log.h" +#include "proc-cmdline.h" +#include "special.h" +#include "string-util.h" +#include "util.h" + +/* + * Implements the logic described in systemd.offline-updates(7). + */ + +static const char *arg_dest = NULL; + +static int generate_symlink(void) { + const char *p = NULL; + + if (laccess("/system-update", F_OK) < 0) { + if (errno == ENOENT) + return 0; + + log_error_errno(errno, "Failed to check for system update: %m"); + return -EINVAL; + } + + p = strjoina(arg_dest, "/" SPECIAL_DEFAULT_TARGET); + 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 overridden by kernel command line systemd.unit= setting"); + else if (!value && runlevel_to_target(key)) + log_warning("Offline system update overridden by runlevel \"%s\" on the kernel command line", key); + + return 0; +} + +static int run(const char *dest, const char *dest_early, const char *dest_late) { + int r; + + assert_se(arg_dest = dest_early); + + r = generate_symlink(); + if (r < 0) + return r; + + r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, 0); + if (r < 0) + log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m"); + + return 0; +} + +DEFINE_MAIN_GENERATOR_FUNCTION(run); |