X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Ffstab-generator%2Ffstab-generator.c;h=23a8d7981314926e2d657ea164fbbf2ee6feab21;hp=62053b7f353928a19fb38e92c8ba664817027021;hb=533740e16118147ca1c066d641654d975ab6e169;hpb=40b8acd039cf1ea00167017e63d9c0a773002f0e

diff --git a/src/fstab-generator/fstab-generator.c b/src/fstab-generator/fstab-generator.c
index 62053b7f3..23a8d7981 100644
--- a/src/fstab-generator/fstab-generator.c
+++ b/src/fstab-generator/fstab-generator.c
@@ -33,6 +33,7 @@
 #include "special.h"
 #include "mkdir.h"
 #include "virt.h"
+#include "fileio.h"
 
 static const char *arg_dest = "/tmp";
 static bool arg_enabled = true;
@@ -79,8 +80,8 @@ 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;
+        char _cleanup_free_ *name = NULL, *unit = NULL, *lnk = NULL, *device = NULL;
+        FILE _cleanup_fclose_ *f = NULL;
         bool noauto, nofail;
         int r, pri = -1;
 
@@ -97,22 +98,20 @@ static int add_swap(const char *what, struct mntent *me) {
         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;
-                log_error("Failed to create unit file %s: %m", unit);
-                goto finish;
+                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);
+                return -errno;
         }
 
         fputs("# Automatically generated by systemd-fstab-generator\n\n"
@@ -139,56 +138,39 @@ 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;
+                        return -errno;
                 }
 
                 r = device_name(what, &device);
                 if (r < 0)
-                        goto finish;
+                        return r;
 
                 if (r > 0) {
                         free(lnk);
                         lnk = strjoin(arg_dest, "/", device, ".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;
+                                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) {
@@ -196,7 +178,9 @@ static bool mount_is_bind(struct mntent *me) {
 
         return
                 hasmntopt(me, "bind") ||
-                streq(me->mnt_opts, "bind");
+                streq(me->mnt_type, "bind") ||
+                hasmntopt(me, "rbind") ||
+                streq(me->mnt_type, "rbind");
 }
 
 static bool mount_is_network(struct mntent *me) {
@@ -207,18 +191,23 @@ static bool mount_is_network(struct mntent *me) {
                 fstype_is_network(me->mnt_type);
 }
 
-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_mount(const char *what, const char *where, const char *type, const char *opts,
+                     int passno, bool noauto, bool nofail, bool automount, bool isbind, bool isnetwork,
+                     const char *source) {
+        char _cleanup_free_
+                *name = NULL, *unit = NULL, *lnk = NULL, *device = NULL,
+                *automount_name = NULL, *automount_unit = NULL;
+        FILE _cleanup_fclose_ *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)) {
@@ -230,15 +219,6 @@ 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;
@@ -248,28 +228,28 @@ static int add_mount(const char *what, const char *where, struct mntent *me) {
         }
 
         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;
-                log_error("Failed to create unit file %s: %m", unit);
-                goto finish;
+                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);
+                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);
+              "SourcePath=%s\n"
+              "DefaultDependencies=no\n",
+              source);
 
         if (!path_equal(where, "/"))
                 fprintf(f,
@@ -295,34 +275,30 @@ static int add_mount(const char *what, const char *where, struct mntent *me) {
                 "FsckPassNo=%i\n",
                 what,
                 where,
-                me->mnt_type,
-                me->mnt_passno);
+                type,
+                passno);
 
-        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;
-                }
+                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;
+                        return -errno;
                 }
 
                 if (!isbind &&
@@ -330,21 +306,18 @@ static int add_mount(const char *what, const char *where, struct mntent *me) {
 
                         r = device_name(what, &device);
                         if (r < 0)
-                                goto finish;
+                                return r;
 
                         if (r > 0) {
                                 free(lnk);
                                 lnk = strjoin(arg_dest, "/", device, ".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;
+                                        return -errno;
                                 }
                         }
                 }
@@ -352,23 +325,18 @@ static int add_mount(const char *what, const char *where, struct mntent *me) {
 
         if (automount && !path_equal(where, "/")) {
                 automount_name = unit_name_from_path(where, ".automount");
-                if (!name) {
-                        r = log_oom();
-                        goto finish;
-                }
+                if (!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,
@@ -387,38 +355,22 @@ static int add_mount(const char *what, const char *where, struct mntent *me) {
                 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) {
@@ -437,19 +389,13 @@ static int parse_fstab(void) {
         }
 
         while ((me = getmntent(f))) {
-                char *where, *what;
+                char _cleanup_free_ *where = NULL, *what = NULL;
                 int k;
 
                 what = fstab_node_to_udev_node(me->mnt_fsname);
-                if (!what) {
-                        r = log_oom();
-                        goto finish;
-                }
-
                 where = strdup(me->mnt_dir);
-                if (!where) {
+                if (!what || !where) {
                         r = log_oom();
-                        free(what);
                         goto finish;
                 }
 
@@ -460,11 +406,21 @@ static int parse_fstab(void) {
 
                 if (streq(me->mnt_type, "swap"))
                         k = add_swap(what, me);
-                else
-                        k = add_mount(what, where, me);
-
-                free(what);
-                free(where);
+                else {
+                        bool noauto, nofail, automount, isbind, isnetwork;
+
+                        noauto = !!hasmntopt(me, "noauto");
+                        nofail = !!hasmntopt(me, "nofail");
+                        automount =
+                                  hasmntopt(me, "comment=systemd.automount") ||
+                                  hasmntopt(me, "x-systemd.automount");
+                        isbind = mount_is_bind(me);
+                        isnetwork = mount_is_network(me);
+
+                        k = add_mount(what, where, me->mnt_type, me->mnt_opts,
+                                     me->mnt_passno, noauto, nofail, automount,
+                                     isbind, isnetwork, "/etc/fstab");
+                }
 
                 if (k < 0)
                         r = k;
@@ -475,8 +431,80 @@ finish:
         return r;
 }
 
+static int parse_new_root_from_proc_cmdline(void) {
+        char *w, *state;
+        _cleanup_free_ char *what = NULL, *type = NULL, *opts = NULL, *line = NULL;
+        int r;
+        size_t l;
+
+        r = read_one_line_file("/proc/cmdline", &line);
+        if (r < 0) {
+                log_error("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
+                return 0;
+        }
+
+        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) {
+                char *word, *tmp_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=")) {
+                        tmp_word = opts;
+                        opts = strjoin(opts, ",", word + 10, NULL);
+                        free(tmp_word);
+                        if (!opts)
+                                return log_oom();
+
+                } else if (streq(word, "ro") || streq(word, "rw")) {
+                        tmp_word = opts;
+                        opts = strjoin(opts, ",", word, NULL);
+                        free(tmp_word);
+                        if (!opts)
+                                return log_oom();
+
+                }
+
+                free(word);
+        }
+
+        if (what) {
+
+                log_debug("Found entry what=%s where=/sysroot type=%s", what, type);
+                r = add_mount(what, "/sysroot", type, opts, 0, false, false, false,
+                              false, false, "/proc/cmdline");
+
+                if (r < 0)
+                        return r;
+        } else
+                log_error("Could not find a root= entry on the kernel commandline.");
+
+        return 0;
+}
+
 static int parse_proc_cmdline(void) {
-        char *line, *w, *state;
+        char _cleanup_free_ *line = NULL;
+        char *w, *state;
         int r;
         size_t l;
 
@@ -490,13 +518,11 @@ static int parse_proc_cmdline(void) {
         }
 
         FOREACH_WORD_QUOTED(w, l, line, state) {
-                char *word;
+                char _cleanup_free_ *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);
@@ -520,19 +546,13 @@ 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, k = 0;
 
         if (argc > 1 && argc != 4) {
                 log_error("This program takes three or no arguments.");
@@ -551,10 +571,13 @@ int main(int argc, char *argv[]) {
         if (parse_proc_cmdline() < 0)
                 return EXIT_FAILURE;
 
+        if (in_initrd())
+                k = parse_new_root_from_proc_cmdline();
+
         if (!arg_enabled)
                 return EXIT_SUCCESS;
 
         r = parse_fstab();
 
-        return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+        return (r < 0) || (k < 0) ? EXIT_FAILURE : EXIT_SUCCESS;
 }