X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Ffstab-generator%2Ffstab-generator.c;h=5480e54b4ea87073d7b13f853e20dbc4056c22a8;hp=23e5051925429ed48fa5adbf0dcbdec2849641ae;hb=e2f123b97b9af34f39cb18ce0c1c5ef6cb89117e;hpb=f9ea108e7c3544c03822277a1112a48dc62f6ed4

diff --git a/src/fstab-generator/fstab-generator.c b/src/fstab-generator/fstab-generator.c
index 23e505192..5480e54b4 100644
--- a/src/fstab-generator/fstab-generator.c
+++ b/src/fstab-generator/fstab-generator.c
@@ -32,27 +32,11 @@
 #include "mount-setup.h"
 #include "special.h"
 #include "mkdir.h"
-#include "virt.h"
+#include "fileio.h"
 
 static const char *arg_dest = "/tmp";
 static bool arg_enabled = true;
 
-static int device_name(const char *path, char **unit) {
-        char *p;
-
-        assert(path);
-
-        if (!is_device_path(path))
-                return 0;
-
-        p = unit_name_from_path(path, ".device");
-        if (!p)
-                return log_oom();
-
-        *unit = p;
-        return 1;
-}
-
 static int mount_find_pri(struct mntent *me, int *ret) {
         char *end, *pri;
         unsigned long r;
@@ -68,7 +52,7 @@ static int mount_find_pri(struct mntent *me, int *ret) {
 
         errno = 0;
         r = strtoul(pri, &end, 10);
-        if (errno != 0)
+        if (errno > 0)
                 return -errno;
 
         if (end == pri || (*end != ',' && *end != 0))
@@ -79,9 +63,9 @@ static int mount_find_pri(struct mntent *me, int *ret) {
 }
 
 static int add_swap(const char *what, struct mntent *me) {
-        char *name = NULL, *unit = NULL, *lnk = NULL, *device = NULL;
-        FILE *f = NULL;
-        bool noauto, nofail;
+        _cleanup_free_ char *name = NULL, *unit = NULL, *lnk = NULL;
+        _cleanup_fclose_ FILE *f = NULL;
+        bool noauto;
         int r, pri = -1;
 
         assert(what);
@@ -94,42 +78,28 @@ static int add_swap(const char *what, struct mntent *me) {
         }
 
         noauto = !!hasmntopt(me, "noauto");
-        nofail = !!hasmntopt(me, "nofail");
 
         name = unit_name_from_path(what, ".swap");
-        if (!name) {
-                r = log_oom();
-                goto finish;
-        }
+        if (!name)
+                return log_oom();
 
         unit = strjoin(arg_dest, "/", name, NULL);
-        if (!unit) {
-                r = log_oom();
-                goto finish;
-        }
+        if (!unit)
+                return log_oom();
 
         f = fopen(unit, "wxe");
         if (!f) {
-                r = -errno;
                 if (errno == EEXIST)
                         log_error("Failed to create swap unit file %s, as it already exists. Duplicate entry in /etc/fstab?", unit);
                 else
                         log_error("Failed to create unit file %s: %m", unit);
-                goto finish;
+                return -errno;
         }
 
-        fputs("# Automatically generated by systemd-fstab-generator\n\n"
-              "[Unit]\n"
-              "SourcePath=/etc/fstab\n"
-              "DefaultDependencies=no\n"
-              "Conflicts=" SPECIAL_UMOUNT_TARGET "\n"
-              "Before=" SPECIAL_UMOUNT_TARGET "\n", f);
-
-        if (!noauto && !nofail)
-                fputs("Before=" SPECIAL_SWAP_TARGET "\n", f);
-
         fprintf(f,
-                "\n"
+                "# Automatically generated by systemd-fstab-generator\n\n"
+                "[Unit]\n"
+                "SourcePath=/etc/fstab\n\n"
                 "[Swap]\n"
                 "What=%s\n",
                 what);
@@ -142,86 +112,115 @@ static int add_swap(const char *what, struct mntent *me) {
         fflush(f);
         if (ferror(f)) {
                 log_error("Failed to write unit file %s: %m", unit);
-                r = -errno;
-                goto finish;
+                return -errno;
         }
 
         if (!noauto) {
                 lnk = strjoin(arg_dest, "/" SPECIAL_SWAP_TARGET ".wants/", name, NULL);
-                if (!lnk) {
-                        r = log_oom();
-                        goto finish;
-                }
+                if (!lnk)
+                        return log_oom();
 
                 mkdir_parents_label(lnk, 0755);
                 if (symlink(unit, lnk) < 0) {
                         log_error("Failed to create symlink %s: %m", lnk);
-                        r = -errno;
-                        goto finish;
-                }
-
-                r = device_name(what, &device);
-                if (r < 0)
-                        goto finish;
-
-                if (r > 0) {
-                        free(lnk);
-                        lnk = strjoin(arg_dest, "/", device, ".wants/", name, NULL);
-                        if (!lnk) {
-                                r = log_oom();
-                                goto finish;
-                        }
-
-                        mkdir_parents_label(lnk, 0755);
-                        if (symlink(unit, lnk) < 0) {
-                                log_error("Failed to create symlink %s: %m", lnk);
-                                r = -errno;
-                                goto finish;
-                        }
+                        return -errno;
                 }
         }
 
-        r = 0;
-finish:
-        if (f)
-                fclose(f);
-
-        free(unit);
-        free(lnk);
-        free(name);
-        free(device);
-
-        return r;
+        return 0;
 }
 
-static bool mount_is_bind(struct mntent *me) {
+static bool mount_is_network(struct mntent *me) {
         assert(me);
 
         return
-                hasmntopt(me, "bind") ||
-                streq(me->mnt_type, "bind");
+                hasmntopt(me, "_netdev") ||
+                fstype_is_network(me->mnt_type);
 }
 
-static bool mount_is_network(struct mntent *me) {
+static bool mount_in_initrd(struct mntent *me) {
         assert(me);
 
         return
-                hasmntopt(me, "_netdev") ||
-                fstype_is_network(me->mnt_type);
+                hasmntopt(me, "x-initrd.mount") ||
+                streq(me->mnt_dir, "/usr");
 }
 
-static int add_mount(const char *what, const char *where, struct mntent *me) {
-        char *name = NULL, *unit = NULL, *lnk = NULL, *device = NULL, *automount_name = NULL, *automount_unit = NULL;
-        FILE *f = NULL;
-        bool noauto, nofail, automount, isbind, isnetwork;
+static int add_fsck(FILE *f, const char *what, const char *where, const char *type, int passno) {
+        assert(f);
+
+        if (passno == 0)
+                return 0;
+
+        if (!is_device_path(what)) {
+                log_warning("Checking was requested for \"%s\", but it is not a device.", what);
+                return 0;
+        }
+
+        if (type && !streq(type, "auto")) {
+                int r;
+                const char *checker;
+
+                checker = strappenda("/sbin/fsck.", type);
+                r = access(checker, X_OK);
+                if (r < 0) {
+                        log_warning("Checking was requested for %s, but %s cannot be used: %m", what, checker);
+
+                        /* treat missing check as essentially OK */
+                        return errno == ENOENT ? 0 : -errno;
+                }
+        }
+
+        if (streq(where, "/")) {
+                char *lnk;
+
+                lnk = strappenda(arg_dest, "/" SPECIAL_LOCAL_FS_TARGET ".wants/systemd-fsck-root.service");
+                mkdir_parents_label(lnk, 0755);
+                if (symlink("systemd-fsck-root.service", lnk) < 0) {
+                        log_error("Failed to create symlink %s: %m", lnk);
+                        return -errno;
+                }
+        } else {
+                _cleanup_free_ char *fsck = NULL;
+
+                fsck = unit_name_from_path_instance("systemd-fsck", what, ".service");
+                if (!fsck)
+                        return log_oom();
+
+                fprintf(f,
+                        "RequiresOverridable=%s\n"
+                        "After=%s\n",
+                        fsck,
+                        fsck);
+        }
+
+        return 0;
+}
+
+static int add_mount(
+                const char *what,
+                const char *where,
+                const char *type,
+                const char *opts,
+                int passno,
+                bool noauto,
+                bool nofail,
+                bool automount,
+                const char *post,
+                const char *source) {
+        _cleanup_free_ char
+                *name = NULL, *unit = NULL, *lnk = NULL,
+                *automount_name = NULL, *automount_unit = NULL;
+        _cleanup_fclose_ FILE *f = NULL;
         int r;
-        const char *post, *pre;
 
         assert(what);
         assert(where);
-        assert(me);
+        assert(type);
+        assert(opts);
+        assert(source);
 
-        if (streq(me->mnt_type, "autofs"))
+        if (streq(type, "autofs"))
                 return 0;
 
         if (!is_path(where)) {
@@ -233,231 +232,154 @@ static int add_mount(const char *what, const char *where, struct mntent *me) {
             mount_point_ignore(where))
                 return 0;
 
-        isnetwork = mount_is_network(me);
-        isbind = mount_is_bind(me);
-
-        noauto = !!hasmntopt(me, "noauto");
-        nofail = !!hasmntopt(me, "nofail");
-        automount =
-                hasmntopt(me, "comment=systemd.automount") ||
-                hasmntopt(me, "x-systemd.automount");
-
-        if (isnetwork) {
-                post = SPECIAL_REMOTE_FS_TARGET;
-                pre = SPECIAL_REMOTE_FS_PRE_TARGET;
-        } else {
-                post = SPECIAL_LOCAL_FS_TARGET;
-                pre = SPECIAL_LOCAL_FS_PRE_TARGET;
-        }
-
         name = unit_name_from_path(where, ".mount");
-        if (!name) {
-                r = log_oom();
-                goto finish;
-        }
+        if (!name)
+                return log_oom();
 
         unit = strjoin(arg_dest, "/", name, NULL);
-        if (!unit) {
-                r = log_oom();
-                goto finish;
-        }
+        if (!unit)
+                return log_oom();
 
         f = fopen(unit, "wxe");
         if (!f) {
-                r = -errno;
                 if (errno == EEXIST)
                         log_error("Failed to create mount unit file %s, as it already exists. Duplicate entry in /etc/fstab?", unit);
                 else
                         log_error("Failed to create unit file %s: %m", unit);
-                goto finish;
+                return -errno;
         }
 
-        fputs("# Automatically generated by systemd-fstab-generator\n\n"
+        fprintf(f,
+              "# Automatically generated by systemd-fstab-generator\n\n"
               "[Unit]\n"
-              "SourcePath=/etc/fstab\n"
-              "DefaultDependencies=no\n", f);
-
-        if (!path_equal(where, "/"))
-                fprintf(f,
-                        "After=%s\n"
-                        "Wants=%s\n"
-                        "Conflicts=" SPECIAL_UMOUNT_TARGET "\n"
-                        "Before=" SPECIAL_UMOUNT_TARGET "\n",
-                        pre,
-                        pre);
-
+              "SourcePath=%s\n",
+              source);
 
-        if (!noauto && !nofail && !automount)
+        if (post && !noauto && !nofail && !automount)
                 fprintf(f,
                         "Before=%s\n",
                         post);
 
+        r = add_fsck(f, what, where, type, passno);
+        if (r < 0)
+                return r;
+
         fprintf(f,
                 "\n"
                 "[Mount]\n"
                 "What=%s\n"
                 "Where=%s\n"
-                "Type=%s\n"
-                "FsckPassNo=%i\n",
+                "Type=%s\n",
                 what,
                 where,
-                me->mnt_type,
-                me->mnt_passno);
+                type);
 
-        if (!isempty(me->mnt_opts) &&
-            !streq(me->mnt_opts, "defaults"))
+        if (!isempty(opts) &&
+            !streq(opts, "defaults"))
                 fprintf(f,
                         "Options=%s\n",
-                        me->mnt_opts);
+                        opts);
 
         fflush(f);
         if (ferror(f)) {
                 log_error("Failed to write unit file %s: %m", unit);
-                r = -errno;
-                goto finish;
+                return -errno;
         }
 
         if (!noauto) {
-                lnk = strjoin(arg_dest, "/", post, nofail || automount ? ".wants/" : ".requires/", name, NULL);
-                if (!lnk) {
-                        r = log_oom();
-                        goto finish;
-                }
-
-                mkdir_parents_label(lnk, 0755);
-                if (symlink(unit, lnk) < 0) {
-                        log_error("Failed to create symlink %s: %m", lnk);
-                        r = -errno;
-                        goto finish;
-                }
+                if (post) {
+                        lnk = strjoin(arg_dest, "/", post, nofail || automount ? ".wants/" : ".requires/", name, NULL);
+                        if (!lnk)
+                                return log_oom();
 
-                if (!isbind &&
-                    !path_equal(where, "/")) {
-
-                        r = device_name(what, &device);
-                        if (r < 0)
-                                goto finish;
-
-                        if (r > 0) {
-                                free(lnk);
-                                lnk = strjoin(arg_dest, "/", device, ".wants/", name, NULL);
-                                if (!lnk) {
-                                        r = log_oom();
-                                        goto finish;
-                                }
-
-                                mkdir_parents_label(lnk, 0755);
-                                if (symlink(unit, lnk) < 0) {
-                                        log_error("Failed to create symlink %s: %m", lnk);
-                                        r = -errno;
-                                        goto finish;
-                                }
+                        mkdir_parents_label(lnk, 0755);
+                        if (symlink(unit, lnk) < 0) {
+                                log_error("Failed to create symlink %s: %m", lnk);
+                                return -errno;
                         }
                 }
         }
 
         if (automount && !path_equal(where, "/")) {
                 automount_name = unit_name_from_path(where, ".automount");
-                if (!name) {
-                        r = log_oom();
-                        goto finish;
-                }
+                if (!automount_name)
+                        return log_oom();
 
                 automount_unit = strjoin(arg_dest, "/", automount_name, NULL);
-                if (!automount_unit) {
-                        r = log_oom();
-                        goto finish;
-                }
+                if (!automount_unit)
+                        return log_oom();
 
                 fclose(f);
                 f = fopen(automount_unit, "wxe");
                 if (!f) {
-                        r = -errno;
                         log_error("Failed to create unit file %s: %m", automount_unit);
-                        goto finish;
+                        return -errno;
                 }
 
                 fprintf(f,
                         "# Automatically generated by systemd-fstab-generator\n\n"
                         "[Unit]\n"
-                        "SourcePath=/etc/fstab\n"
-                        "DefaultDependencies=no\n"
-                        "Conflicts=" SPECIAL_UMOUNT_TARGET "\n"
-                        "Before=" SPECIAL_UMOUNT_TARGET " %s\n"
-                        "\n"
+                        "SourcePath=%s\n",
+                        source);
+
+                if (post)
+                        fprintf(f,
+                                "Before= %s\n",
+                                post);
+
+                fprintf(f,
                         "[Automount]\n"
                         "Where=%s\n",
-                        post,
                         where);
 
                 fflush(f);
                 if (ferror(f)) {
                         log_error("Failed to write unit file %s: %m", automount_unit);
-                        r = -errno;
-                        goto finish;
+                        return -errno;
                 }
 
                 free(lnk);
                 lnk = strjoin(arg_dest, "/", post, nofail ? ".wants/" : ".requires/", automount_name, NULL);
-                if (!lnk) {
-                        r = log_oom();
-                        goto finish;
-                }
+                if (!lnk)
+                        return log_oom();
 
                 mkdir_parents_label(lnk, 0755);
                 if (symlink(automount_unit, lnk) < 0) {
                         log_error("Failed to create symlink %s: %m", lnk);
-                        r = -errno;
-                        goto finish;
+                        return -errno;
                 }
         }
 
-        r = 0;
-finish:
-        if (f)
-                fclose(f);
-
-        free(unit);
-        free(lnk);
-        free(name);
-        free(device);
-        free(automount_name);
-        free(automount_unit);
-
-        return r;
+        return 0;
 }
 
-static int parse_fstab(void) {
-        FILE *f;
+static int parse_fstab(const char *prefix, bool initrd) {
+        char *fstab_path;
+        _cleanup_endmntent_ FILE *f;
         int r = 0;
         struct mntent *me;
 
-        errno = 0;
-        f = setmntent("/etc/fstab", "r");
+        fstab_path = strappenda(strempty(prefix), "/etc/fstab");
+        f = setmntent(fstab_path, "r");
         if (!f) {
                 if (errno == ENOENT)
                         return 0;
 
-                log_error("Failed to open /etc/fstab: %m");
+                log_error("Failed to open %s/etc/fstab: %m", strempty(prefix));
                 return -errno;
         }
 
         while ((me = getmntent(f))) {
-                char *where, *what;
+                _cleanup_free_ char *where = NULL, *what = NULL;
                 int k;
 
-                what = fstab_node_to_udev_node(me->mnt_fsname);
-                if (!what) {
-                        r = log_oom();
-                        goto finish;
-                }
+                if (initrd && !mount_in_initrd(me))
+                        continue;
 
-                where = strdup(me->mnt_dir);
-                if (!where) {
-                        r = log_oom();
-                        free(what);
-                        goto finish;
-                }
+                what = fstab_node_to_udev_node(me->mnt_fsname);
+                where = strjoin(strempty(prefix), me->mnt_dir, NULL);
+                if (!what || !where)
+                        return log_oom();
 
                 if (is_path(where))
                         path_kill_slashes(where);
@@ -466,43 +388,137 @@ static int parse_fstab(void) {
 
                 if (streq(me->mnt_type, "swap"))
                         k = add_swap(what, me);
-                else
-                        k = add_mount(what, where, me);
+                else {
+                        bool noauto, nofail, automount;
+                        const char *post;
+
+                        noauto = !!hasmntopt(me, "noauto");
+                        nofail = !!hasmntopt(me, "nofail");
+                        automount =
+                                  hasmntopt(me, "comment=systemd.automount") ||
+                                  hasmntopt(me, "x-systemd.automount");
+
+                        if (initrd) {
+                                post = SPECIAL_INITRD_FS_TARGET;
+                        } else if (mount_in_initrd(me)) {
+                                post = SPECIAL_INITRD_ROOT_FS_TARGET;
+                        } else if (mount_is_network(me)) {
+                                post = SPECIAL_REMOTE_FS_TARGET;
+                        } else {
+                                post = SPECIAL_LOCAL_FS_TARGET;
+                        }
 
-                free(what);
-                free(where);
+                        k = add_mount(what, where, me->mnt_type, me->mnt_opts,
+                                      me->mnt_passno, noauto, nofail, automount,
+                                      post, fstab_path);
+                }
 
                 if (k < 0)
                         r = k;
         }
 
-finish:
-        endmntent(f);
         return r;
 }
 
-static int parse_proc_cmdline(void) {
-        char *line, *w, *state;
-        int r;
+static int parse_new_root_from_proc_cmdline(void) {
+        _cleanup_free_ char *what = NULL, *type = NULL, *opts = NULL, *line = NULL;
+        bool noauto, nofail;
+        char *w, *state;
         size_t l;
+        int r;
 
-        if (detect_container(NULL) > 0)
+        r = proc_cmdline(&line);
+        if (r < 0)
+                log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
+        if (r <= 0)
                 return 0;
 
-        r = read_one_line_file("/proc/cmdline", &line);
-        if (r < 0) {
-                log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
+        opts = strdup("ro");
+        type = strdup("auto");
+        if (!opts || !type)
+                return log_oom();
+
+        /* root= and roofstype= may occur more than once, the last instance should take precedence.
+         * In the case of multiple rootflags= the arguments should be concatenated */
+        FOREACH_WORD_QUOTED(w, l, line, state) {
+                _cleanup_free_ char *word;
+
+                word = strndup(w, l);
+                if (!word)
+                        return log_oom();
+
+                else if (startswith(word, "root=")) {
+                        free(what);
+                        what = fstab_node_to_udev_node(word+5);
+                        if (!what)
+                                return log_oom();
+
+                } else if (startswith(word, "rootfstype=")) {
+                        free(type);
+                        type = strdup(word + 11);
+                        if (!type)
+                                return log_oom();
+
+                } else if (startswith(word, "rootflags=")) {
+                        char *o;
+
+                        o = strjoin(opts, ",", word + 10, NULL);
+                        if (!o)
+                                return log_oom();
+
+                        free(opts);
+                        opts = o;
+
+                } else if (streq(word, "ro") || streq(word, "rw")) {
+                        char *o;
+
+                        o = strjoin(opts, ",", word, NULL);
+                        if (!o)
+                                return log_oom();
+
+                        free(opts);
+                        opts = o;
+                }
+        }
+
+        noauto = !!strstr(opts, "noauto");
+        nofail = !!strstr(opts, "nofail");
+
+        if (!what) {
+                log_debug("Could not find a root= entry on the kernel commandline.");
+                return 0;
+        }
+
+        if (what[0] != '/') {
+                log_debug("Skipping entry what=%s where=/sysroot type=%s", what, type);
                 return 0;
         }
 
+        log_debug("Found entry what=%s where=/sysroot type=%s", what, type);
+        r = add_mount(what, "/sysroot", type, opts, 1, noauto, nofail, false,
+                      SPECIAL_INITRD_ROOT_FS_TARGET, "/proc/cmdline");
+
+        return (r < 0) ? r : 0;
+}
+
+static int parse_proc_cmdline(void) {
+        _cleanup_free_ char *line = NULL;
+        char *w, *state;
+        size_t l;
+        int r;
+
+        r = proc_cmdline(&line);
+        if (r < 0)
+                log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
+        if (r <= 0)
+                return 0;
+
         FOREACH_WORD_QUOTED(w, l, line, state) {
-                char *word;
+                _cleanup_free_ char *word = NULL;
 
                 word = strndup(w, l);
-                if (!word) {
-                        r = log_oom();
-                        goto finish;
-                }
+                if (!word)
+                        return log_oom();
 
                 if (startswith(word, "fstab=")) {
                         r = parse_boolean(word + 6);
@@ -514,9 +530,9 @@ static int parse_proc_cmdline(void) {
                 } else if (startswith(word, "rd.fstab=")) {
 
                         if (in_initrd()) {
-                                r = parse_boolean(word + 6);
+                                r = parse_boolean(word + 9);
                                 if (r < 0)
-                                        log_warning("Failed to parse fstab switch %s. Ignoring.", word + 6);
+                                        log_warning("Failed to parse fstab switch %s. Ignoring.", word + 9);
                                 else
                                         arg_enabled = r;
                         }
@@ -526,19 +542,13 @@ static int parse_proc_cmdline(void) {
 
                         log_warning("Unknown kernel switch %s. Ignoring.", word);
                 }
-
-                free(word);
         }
 
-        r = 0;
-
-finish:
-        free(line);
-        return r;
+        return 0;
 }
 
 int main(int argc, char *argv[]) {
-        int r;
+        int r = 0, k, l = 0;
 
         if (argc > 1 && argc != 4) {
                 log_error("This program takes three or no arguments.");
@@ -557,10 +567,16 @@ int main(int argc, char *argv[]) {
         if (parse_proc_cmdline() < 0)
                 return EXIT_FAILURE;
 
+        if (in_initrd())
+                r = parse_new_root_from_proc_cmdline();
+
         if (!arg_enabled)
-                return EXIT_SUCCESS;
+                return (r < 0) ? EXIT_FAILURE : EXIT_SUCCESS;
+
+        k = parse_fstab(NULL, false);
 
-        r = parse_fstab();
+        if (in_initrd())
+                l = parse_fstab("/sysroot", true);
 
-        return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+        return (r < 0) || (k < 0) || (l < 0) ? EXIT_FAILURE : EXIT_SUCCESS;
 }