X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fshared%2Fbase-filesystem.c;h=11e09474070effee2a78e66ab5f43e705a317b71;hb=d44c666228d4872101eae5e55f44b1985476e7f2;hp=682155bb4538335b7e96be4a6d279d0bf13ec6bf;hpb=e1ae9755ab70a58b8fb84973e084296b1d2df3d5;p=elogind.git

diff --git a/src/shared/base-filesystem.c b/src/shared/base-filesystem.c
index 682155bb4..11e094740 100644
--- a/src/shared/base-filesystem.c
+++ b/src/shared/base-filesystem.c
@@ -22,53 +22,64 @@
 #include <errno.h>
 #include <sys/stat.h>
 #include <stdlib.h>
-#include <string.h>
-#include <assert.h>
 #include <unistd.h>
 
 #include "base-filesystem.h"
 #include "log.h"
 #include "macro.h"
-#include "strv.h"
 #include "util.h"
-#include "label.h"
-#include "mkdir.h"
 
 typedef struct BaseFilesystem {
         const char *dir;
         mode_t mode;
         const char *target;
+        const char *exists;
 } BaseFilesystem;
 
 static const BaseFilesystem table[] = {
-        { "bin",      0, "usr/bin" },
-        { "lib",      0, "usr/lib" },
+        { "bin",      0, "usr/bin\0",                  NULL },
+        { "lib",      0, "usr/lib\0",                  NULL },
+        { "root",  0755, NULL,                         NULL },
+        { "sbin",     0, "usr/sbin\0",                 NULL },
 #if defined(__i386__) || defined(__x86_64__)
-        { "lib64",    0, "usr/lib/x86_64-linux-gnu\0usr/lib64" },
+        { "lib64",    0, "usr/lib/x86_64-linux-gnu\0"
+                         "usr/lib64\0",                "ld-linux-x86-64.so.2" },
 #endif
-        { "root",  0755, NULL },
-        { "sbin",     0, "usr/sbin" },
 };
 
 int base_filesystem_create(const char *root) {
         _cleanup_close_ int fd = -1;
         unsigned i;
-        int r;
+        int r = 0;
 
         fd = open(root, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW);
         if (fd < 0)
-                return -errno;
+                return log_error_errno(errno, "Failed to open root file system: %m");
 
         for (i = 0; i < ELEMENTSOF(table); i ++) {
+                if (faccessat(fd, table[i].dir, F_OK, AT_SYMLINK_NOFOLLOW) >= 0)
+                        continue;
+
                 if (table[i].target) {
-                        const char *target = NULL;
-                        const char *s;
+                        const char *target = NULL, *s;
 
                         /* check if one of the targets exists */
                         NULSTR_FOREACH(s, table[i].target) {
                                 if (faccessat(fd, s, F_OK, AT_SYMLINK_NOFOLLOW) < 0)
                                         continue;
 
+                                /* check if a specific file exists at the target path */
+                                if (table[i].exists) {
+                                        _cleanup_free_ char *p = NULL;
+
+                                        p = strjoin(s, "/", table[i].exists, NULL);
+                                        if (!p)
+                                                return log_oom();
+
+                                        if (faccessat(fd, p, F_OK, AT_SYMLINK_NOFOLLOW) < 0)
+                                                continue;
+                                }
+
                                 target = s;
                                 break;
                         }
@@ -77,19 +88,15 @@ int base_filesystem_create(const char *root) {
                                 continue;
 
                         r = symlinkat(target, fd, table[i].dir);
-                        if (r < 0 && errno != EEXIST) {
-                                log_error("Failed to create symlink at %s/%s: %m", root, table[i].dir);
-                                return -errno;
-                        }
+                        if (r < 0 && errno != EEXIST)
+                                return log_error_errno(errno, "Failed to create symlink at %s/%s: %m", root, table[i].dir);
                         continue;
                 }
 
                 RUN_WITH_UMASK(0000)
                         r = mkdirat(fd, table[i].dir, table[i].mode);
-                if (r < 0 && errno != EEXIST) {
-                        log_error("Failed to create directory at %s/%s: %m", root, table[i].dir);
-                        return -errno;
-                }
+                if (r < 0 && errno != EEXIST)
+                        return log_error_errno(errno, "Failed to create directory at %s/%s: %m", root, table[i].dir);
         }
 
         return 0;