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-rw-r--r--src/shared/generator.c504
1 files changed, 504 insertions, 0 deletions
diff --git a/src/shared/generator.c b/src/shared/generator.c
new file mode 100644
index 0000000..0adaaf2
--- /dev/null
+++ b/src/shared/generator.c
@@ -0,0 +1,504 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <errno.h>
+#include <stdio_ext.h>
+#include <unistd.h>
+
+#include "alloc-util.h"
+#include "dropin.h"
+#include "escape.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "fstab-util.h"
+#include "generator.h"
+#include "log.h"
+#include "macro.h"
+#include "mkdir.h"
+#include "path-util.h"
+#include "special.h"
+#include "specifier.h"
+#include "string-util.h"
+#include "time-util.h"
+#include "unit-name.h"
+#include "util.h"
+
+int generator_open_unit_file(
+ const char *dest,
+ const char *source,
+ const char *name,
+ FILE **file) {
+
+ const char *unit;
+ FILE *f;
+
+ unit = strjoina(dest, "/", name);
+
+ f = fopen(unit, "wxe");
+ if (!f) {
+ if (source && errno == EEXIST)
+ return log_error_errno(errno,
+ "Failed to create unit file %s, as it already exists. Duplicate entry in %s?",
+ unit, source);
+ else
+ return log_error_errno(errno,
+ "Failed to create unit file %s: %m",
+ unit);
+ }
+
+ (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
+
+ fprintf(f,
+ "# Automatically generated by %s\n\n",
+ program_invocation_short_name);
+
+ *file = f;
+ return 0;
+}
+
+int generator_add_symlink(const char *root, const char *dst, const char *dep_type, const char *src) {
+ /* Adds a symlink from <dst>.<dep_type>.d/ to ../<src> */
+
+ const char *from, *to;
+
+ from = strjoina("../", src);
+ to = strjoina(root, "/", dst, ".", dep_type, "/", src);
+
+ mkdir_parents_label(to, 0755);
+ if (symlink(from, to) < 0)
+ if (errno != EEXIST)
+ return log_error_errno(errno, "Failed to create symlink \"%s\": %m", to);
+
+ return 0;
+}
+
+static int write_fsck_sysroot_service(const char *dir, const char *what) {
+ _cleanup_free_ char *device = NULL, *escaped = NULL, *escaped2 = NULL;
+ _cleanup_fclose_ FILE *f = NULL;
+ const char *unit;
+ int r;
+
+ escaped = specifier_escape(what);
+ if (!escaped)
+ return log_oom();
+
+ escaped2 = cescape(escaped);
+ if (!escaped2)
+ return log_oom();
+
+ unit = strjoina(dir, "/systemd-fsck-root.service");
+ log_debug("Creating %s", unit);
+
+ r = unit_name_from_path(what, ".device", &device);
+ if (r < 0)
+ return log_error_errno(r, "Failed to convert device \"%s\" to unit name: %m", what);
+
+ f = fopen(unit, "wxe");
+ if (!f)
+ return log_error_errno(errno, "Failed to create unit file %s: %m", unit);
+
+ fprintf(f,
+ "# Automatically generated by %1$s\n\n"
+ "[Unit]\n"
+ "Description=File System Check on %2$s\n"
+ "Documentation=man:systemd-fsck-root.service(8)\n"
+ "DefaultDependencies=no\n"
+ "BindsTo=%3$s\n"
+ "Conflicts=shutdown.target\n"
+ "After=initrd-root-device.target local-fs-pre.target %3$s\n"
+ "Before=shutdown.target\n"
+ "\n"
+ "[Service]\n"
+ "Type=oneshot\n"
+ "RemainAfterExit=yes\n"
+ "ExecStart=" SYSTEMD_FSCK_PATH " %4$s\n"
+ "TimeoutSec=0\n",
+ program_invocation_short_name,
+ escaped,
+ device,
+ escaped2);
+
+ r = fflush_and_check(f);
+ if (r < 0)
+ return log_error_errno(r, "Failed to write unit file %s: %m", unit);
+
+ return 0;
+}
+
+int generator_write_fsck_deps(
+ FILE *f,
+ const char *dir,
+ const char *what,
+ const char *where,
+ const char *fstype) {
+
+ int r;
+
+ assert(f);
+ assert(dir);
+ assert(what);
+ assert(where);
+
+ if (!is_device_path(what)) {
+ log_warning("Checking was requested for \"%s\", but it is not a device.", what);
+ return 0;
+ }
+
+ if (!isempty(fstype) && !streq(fstype, "auto")) {
+ r = fsck_exists(fstype);
+ if (r < 0)
+ log_warning_errno(r, "Checking was requested for %s, but couldn't detect if fsck.%s may be used, proceeding: %m", what, fstype);
+ else if (r == 0) {
+ /* treat missing check as essentially OK */
+ log_debug("Checking was requested for %s, but fsck.%s does not exist.", what, fstype);
+ return 0;
+ }
+ }
+
+ if (path_equal(where, "/")) {
+ const char *lnk;
+
+ lnk = strjoina(dir, "/" SPECIAL_LOCAL_FS_TARGET ".wants/systemd-fsck-root.service");
+
+ mkdir_parents(lnk, 0755);
+ if (symlink(SYSTEM_DATA_UNIT_PATH "/systemd-fsck-root.service", lnk) < 0)
+ return log_error_errno(errno, "Failed to create symlink %s: %m", lnk);
+
+ } else {
+ _cleanup_free_ char *_fsck = NULL;
+ const char *fsck;
+
+ if (in_initrd() && path_equal(where, "/sysroot")) {
+ r = write_fsck_sysroot_service(dir, what);
+ if (r < 0)
+ return r;
+
+ fsck = "systemd-fsck-root.service";
+ } else {
+ r = unit_name_from_path_instance("systemd-fsck", what, ".service", &_fsck);
+ if (r < 0)
+ return log_error_errno(r, "Failed to create fsck service name: %m");
+
+ fsck = _fsck;
+ }
+
+ fprintf(f,
+ "Requires=%1$s\n"
+ "After=%1$s\n",
+ fsck);
+ }
+
+ return 0;
+}
+
+int generator_write_timeouts(
+ const char *dir,
+ const char *what,
+ const char *where,
+ const char *opts,
+ char **filtered) {
+
+ /* Configure how long we wait for a device that backs a mount point or a
+ * swap partition to show up. This is useful to support endless device timeouts
+ * for devices that show up only after user input, like crypto devices. */
+
+ _cleanup_free_ char *node = NULL, *unit = NULL, *timeout = NULL;
+ usec_t u;
+ int r;
+
+ r = fstab_filter_options(opts, "comment=systemd.device-timeout\0"
+ "x-systemd.device-timeout\0",
+ NULL, &timeout, filtered);
+ if (r <= 0)
+ return r;
+
+ r = parse_sec_fix_0(timeout, &u);
+ if (r < 0) {
+ log_warning("Failed to parse timeout for %s, ignoring: %s", where, timeout);
+ return 0;
+ }
+
+ node = fstab_node_to_udev_node(what);
+ if (!node)
+ return log_oom();
+ if (!is_device_path(node)) {
+ log_warning("x-systemd.device-timeout ignored for %s", what);
+ return 0;
+ }
+
+ r = unit_name_from_path(node, ".device", &unit);
+ if (r < 0)
+ return log_error_errno(r, "Failed to make unit name from path: %m");
+
+ return write_drop_in_format(dir, unit, 50, "device-timeout",
+ "# Automatically generated by %s\n\n"
+ "[Unit]\n"
+ "JobRunningTimeoutSec=%s",
+ program_invocation_short_name,
+ timeout);
+}
+
+int generator_write_device_deps(
+ const char *dir,
+ const char *what,
+ const char *where,
+ const char *opts) {
+
+ /* fstab records that specify _netdev option should apply the network
+ * ordering on the actual device depending on network connection. If we
+ * are not mounting real device (NFS, CIFS), we rely on _netdev effect
+ * on the mount unit itself. */
+
+ _cleanup_free_ char *node = NULL, *unit = NULL;
+ int r;
+
+ if (!fstab_test_option(opts, "_netdev\0"))
+ return 0;
+
+ node = fstab_node_to_udev_node(what);
+ if (!node)
+ return log_oom();
+
+ /* Nothing to apply dependencies to. */
+ if (!is_device_path(node))
+ return 0;
+
+ r = unit_name_from_path(node, ".device", &unit);
+ if (r < 0)
+ return log_error_errno(r, "Failed to make unit name from path \"%s\": %m",
+ node);
+
+ /* See mount_add_default_dependencies for explanation why we create such
+ * dependencies. */
+ return write_drop_in_format(dir, unit, 50, "netdev-dependencies",
+ "# Automatically generated by %s\n\n"
+ "[Unit]\n"
+ "After=" SPECIAL_NETWORK_ONLINE_TARGET " " SPECIAL_NETWORK_TARGET "\n"
+ "Wants=" SPECIAL_NETWORK_ONLINE_TARGET "\n",
+ program_invocation_short_name);
+}
+
+int generator_write_initrd_root_device_deps(const char *dir, const char *what) {
+ _cleanup_free_ char *unit = NULL;
+ int r;
+
+ r = unit_name_from_path(what, ".device", &unit);
+ if (r < 0)
+ return log_error_errno(r, "Failed to make unit name from path \"%s\": %m",
+ what);
+
+ return write_drop_in_format(dir, SPECIAL_INITRD_ROOT_DEVICE_TARGET, 50, "root-device",
+ "# Automatically generated by %s\n\n"
+ "[Unit]\n"
+ "Requires=%s\n"
+ "After=%s",
+ program_invocation_short_name,
+ unit,
+ unit);
+}
+
+int generator_hook_up_mkswap(
+ const char *dir,
+ const char *what) {
+
+ _cleanup_free_ char *node = NULL, *unit = NULL, *escaped = NULL, *where_unit = NULL;
+ _cleanup_fclose_ FILE *f = NULL;
+ const char *unit_file;
+ int r;
+
+ node = fstab_node_to_udev_node(what);
+ if (!node)
+ return log_oom();
+
+ /* Nothing to work on. */
+ if (!is_device_path(node))
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Cannot format something that is not a device node: %s",
+ node);
+
+ r = unit_name_from_path_instance("systemd-mkswap", node, ".service", &unit);
+ if (r < 0)
+ return log_error_errno(r, "Failed to make unit instance name from path \"%s\": %m",
+ node);
+
+ unit_file = strjoina(dir, "/", unit);
+ log_debug("Creating %s", unit_file);
+
+ escaped = cescape(node);
+ if (!escaped)
+ return log_oom();
+
+ r = unit_name_from_path(what, ".swap", &where_unit);
+ if (r < 0)
+ return log_error_errno(r, "Failed to make unit name from path \"%s\": %m",
+ what);
+
+ f = fopen(unit_file, "wxe");
+ if (!f)
+ return log_error_errno(errno, "Failed to create unit file %s: %m",
+ unit_file);
+
+ fprintf(f,
+ "# Automatically generated by %s\n\n"
+ "[Unit]\n"
+ "Description=Make Swap on %%f\n"
+ "Documentation=man:systemd-mkswap@.service(8)\n"
+ "DefaultDependencies=no\n"
+ "BindsTo=%%i.device\n"
+ "Conflicts=shutdown.target\n"
+ "After=%%i.device\n"
+ "Before=shutdown.target %s\n"
+ "\n"
+ "[Service]\n"
+ "Type=oneshot\n"
+ "RemainAfterExit=yes\n"
+ "ExecStart="SYSTEMD_MAKEFS_PATH " swap %s\n"
+ "TimeoutSec=0\n",
+ program_invocation_short_name,
+ where_unit,
+ escaped);
+
+ r = fflush_and_check(f);
+ if (r < 0)
+ return log_error_errno(r, "Failed to write unit file %s: %m", unit_file);
+
+ return generator_add_symlink(dir, where_unit, "requires", unit);
+}
+
+int generator_hook_up_mkfs(
+ const char *dir,
+ const char *what,
+ const char *where,
+ const char *type) {
+
+ _cleanup_free_ char *node = NULL, *unit = NULL, *escaped = NULL, *where_unit = NULL;
+ _cleanup_fclose_ FILE *f = NULL;
+ const char *unit_file;
+ int r;
+
+ node = fstab_node_to_udev_node(what);
+ if (!node)
+ return log_oom();
+
+ /* Nothing to work on. */
+ if (!is_device_path(node))
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Cannot format something that is not a device node: %s",
+ node);
+
+ if (!type || streq(type, "auto"))
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Cannot format partition %s, filesystem type is not specified",
+ node);
+
+ r = unit_name_from_path_instance("systemd-mkfs", node, ".service", &unit);
+ if (r < 0)
+ return log_error_errno(r, "Failed to make unit instance name from path \"%s\": %m",
+ node);
+
+ unit_file = strjoina(dir, "/", unit);
+ log_debug("Creating %s", unit_file);
+
+ escaped = cescape(node);
+ if (!escaped)
+ return log_oom();
+
+ r = unit_name_from_path(where, ".mount", &where_unit);
+ if (r < 0)
+ return log_error_errno(r, "Failed to make unit name from path \"%s\": %m",
+ where);
+
+ f = fopen(unit_file, "wxe");
+ if (!f)
+ return log_error_errno(errno, "Failed to create unit file %s: %m",
+ unit_file);
+
+ fprintf(f,
+ "# Automatically generated by %s\n\n"
+ "[Unit]\n"
+ "Description=Make File System on %%f\n"
+ "Documentation=man:systemd-mkfs@.service(8)\n"
+ "DefaultDependencies=no\n"
+ "BindsTo=%%i.device\n"
+ "Conflicts=shutdown.target\n"
+ "After=%%i.device\n"
+ /* fsck might or might not be used, so let's be safe and order
+ * ourselves before both systemd-fsck@.service and the mount unit. */
+ "Before=shutdown.target systemd-fsck@%%i.service %s\n"
+ "\n"
+ "[Service]\n"
+ "Type=oneshot\n"
+ "RemainAfterExit=yes\n"
+ "ExecStart="SYSTEMD_MAKEFS_PATH " %s %s\n"
+ "TimeoutSec=0\n",
+ program_invocation_short_name,
+ where_unit,
+ type,
+ escaped);
+ // XXX: what about local-fs-pre.target?
+
+ r = fflush_and_check(f);
+ if (r < 0)
+ return log_error_errno(r, "Failed to write unit file %s: %m", unit_file);
+
+ return generator_add_symlink(dir, where_unit, "requires", unit);
+}
+
+int generator_hook_up_growfs(
+ const char *dir,
+ const char *where,
+ const char *target) {
+
+ _cleanup_free_ char *unit = NULL, *escaped = NULL, *where_unit = NULL;
+ _cleanup_fclose_ FILE *f = NULL;
+ const char *unit_file;
+ int r;
+
+ escaped = cescape(where);
+ if (!escaped)
+ return log_oom();
+
+ r = unit_name_from_path_instance("systemd-growfs", where, ".service", &unit);
+ if (r < 0)
+ return log_error_errno(r, "Failed to make unit instance name from path \"%s\": %m",
+ where);
+
+ r = unit_name_from_path(where, ".mount", &where_unit);
+ if (r < 0)
+ return log_error_errno(r, "Failed to make unit name from path \"%s\": %m",
+ where);
+
+ unit_file = strjoina(dir, "/", unit);
+ log_debug("Creating %s", unit_file);
+
+ f = fopen(unit_file, "wxe");
+ if (!f)
+ return log_error_errno(errno, "Failed to create unit file %s: %m",
+ unit_file);
+
+ fprintf(f,
+ "# Automatically generated by %s\n\n"
+ "[Unit]\n"
+ "Description=Grow File System on %%f\n"
+ "Documentation=man:systemd-growfs@.service(8)\n"
+ "DefaultDependencies=no\n"
+ "BindsTo=%%i.mount\n"
+ "Conflicts=shutdown.target\n"
+ "After=%%i.mount\n"
+ "Before=shutdown.target %s\n"
+ "\n"
+ "[Service]\n"
+ "Type=oneshot\n"
+ "RemainAfterExit=yes\n"
+ "ExecStart="SYSTEMD_GROWFS_PATH " %s\n"
+ "TimeoutSec=0\n",
+ program_invocation_short_name,
+ target,
+ escaped);
+
+ return generator_add_symlink(dir, where_unit, "wants", unit);
+}
+
+void log_setup_generator(void) {
+ log_set_prohibit_ipc(true);
+ log_setup_service();
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-16 23:25:59 +0000