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-rw-r--r--man/tmpfiles.d.xml11
-rw-r--r--src/shared/util.c79
-rw-r--r--src/shared/util.h3
-rw-r--r--src/tmpfiles/tmpfiles.c54
-rw-r--r--tmpfiles.d/etc.conf2
5 files changed, 103 insertions, 46 deletions
diff --git a/man/tmpfiles.d.xml b/man/tmpfiles.d.xml
index 0081a6762a..2d8af981e9 100644
--- a/man/tmpfiles.d.xml
+++ b/man/tmpfiles.d.xml
@@ -174,7 +174,16 @@ L /tmp/foobar - - - - /dev/null</programlisting>
<varlistentry>
<term><varname>L</varname></term>
- <listitem><para>Create a symlink if it does not exist yet.</para></listitem>
+ <term><varname>L+</varname></term>
+ <listitem><para>Create a
+ symlink if it does not exist
+ yet. If suffixed with
+ <varname>+</varname> and a
+ file already exists where the
+ symlink is to be created it
+ will be removed and be
+ replaced by the
+ symlink.</para></listitem>
</varlistentry>
<varlistentry>
diff --git a/src/shared/util.c b/src/shared/util.c
index d93a9680fd..d840dedfc6 100644
--- a/src/shared/util.c
+++ b/src/shared/util.c
@@ -4013,7 +4013,7 @@ int fopen_temporary(const char *path, FILE **_f, char **_temp_path) {
assert(_f);
assert(_temp_path);
- t = strappend(path, ".XXXXXX");
+ t = tempfn_xxxxxx(path);
if (!t)
return -ENOMEM;
@@ -4125,42 +4125,21 @@ int vt_disallocate(const char *name) {
}
int symlink_atomic(const char *from, const char *to) {
- char *x;
- _cleanup_free_ char *t;
- const char *fn;
- size_t k;
- uint64_t u;
- unsigned i;
- int r;
+ _cleanup_free_ char *t = NULL;
assert(from);
assert(to);
- t = new(char, strlen(to) + 1 + 16 + 1);
+ t = tempfn_random(to);
if (!t)
return -ENOMEM;
- fn = basename(to);
- k = fn-to;
- memcpy(t, to, k);
- t[k] = '.';
- x = stpcpy(t+k+1, fn);
-
- u = random_u64();
- for (i = 0; i < 16; i++) {
- *(x++) = hexchar(u & 0xF);
- u >>= 4;
- }
-
- *x = 0;
-
if (symlink(from, t) < 0)
return -errno;
if (rename(t, to) < 0) {
- r = -errno;
- unlink(t);
- return r;
+ unlink_noerrno(t);
+ return -errno;
}
return 0;
@@ -6669,3 +6648,51 @@ int fflush_and_check(FILE *f) {
return 0;
}
+
+char *tempfn_xxxxxx(const char *p) {
+ const char *fn;
+ char *t;
+ size_t k;
+
+ assert(p);
+
+ t = new(char, strlen(p) + 1 + 6 + 1);
+ if (!t)
+ return NULL;
+
+ fn = basename(p);
+ k = fn - p;
+
+ strcpy(stpcpy(stpcpy(mempcpy(t, p, k), "."), fn), "XXXXXX");
+
+ return t;
+}
+
+char *tempfn_random(const char *p) {
+ const char *fn;
+ char *t, *x;
+ uint64_t u;
+ size_t k;
+ unsigned i;
+
+ assert(p);
+
+ t = new(char, strlen(p) + 1 + 16 + 1);
+ if (!t)
+ return NULL;
+
+ fn = basename(p);
+ k = fn - p;
+
+ x = stpcpy(stpcpy(mempcpy(t, p, k), "."), fn);
+
+ u = random_u64();
+ for (i = 0; i < 16; i++) {
+ *(x++) = hexchar(u & 0xF);
+ u >>= 4;
+ }
+
+ *x = 0;
+
+ return t;
+}
diff --git a/src/shared/util.h b/src/shared/util.h
index 1796014f26..e8552410c0 100644
--- a/src/shared/util.h
+++ b/src/shared/util.h
@@ -948,3 +948,6 @@ int umount_recursive(const char *target, int flags);
int bind_remount_recursive(const char *prefix, bool ro);
int fflush_and_check(FILE *f);
+
+char *tempfn_xxxxxx(const char *p);
+char *tempfn_random(const char *p);
diff --git a/src/tmpfiles/tmpfiles.c b/src/tmpfiles/tmpfiles.c
index 0fd2bd233a..0c1c2b17f4 100644
--- a/src/tmpfiles/tmpfiles.c
+++ b/src/tmpfiles/tmpfiles.c
@@ -103,6 +103,8 @@ typedef struct Item {
bool keep_first_level:1;
+ bool force:1;
+
bool done:1;
} Item;
@@ -746,31 +748,38 @@ static int create_item(Item *i) {
break;
- case CREATE_SYMLINK: {
- _cleanup_free_ char *x = NULL;
+ case CREATE_SYMLINK:
label_context_set(i->path, S_IFLNK);
r = symlink(i->argument, i->path);
label_context_clear();
- if (r < 0 && errno != EEXIST) {
- log_error("symlink(%s, %s) failed: %m", i->argument, i->path);
- return -errno;
- }
-
- r = readlink_malloc(i->path, &x);
if (r < 0) {
- log_error("readlink(%s) failed: %s", i->path, strerror(-r));
- return -errno;
- }
+ _cleanup_free_ char *x = NULL;
- if (!streq(i->argument, x)) {
- log_error("%s is not the right symlink.", i->path);
- return -EEXIST;
+ if (errno != EEXIST) {
+ log_error("symlink(%s, %s) failed: %m", i->argument, i->path);
+ return -errno;
+ }
+
+ r = readlink_malloc(i->path, &x);
+ if (r < 0 || !streq(i->argument, x)) {
+
+ if (i->force) {
+ label_context_set(i->path, S_IFLNK);
+ r = symlink_atomic(i->argument, i->path);
+ label_context_clear();
+
+ if (r < 0) {
+ log_error("symlink(%s, %s) failed: %m", i->argument, i->path);
+ return -errno;
+ }
+ } else
+ log_debug("%s is not a symlink or does not point to the correct path.", i->path);
+ }
}
break;
- }
case CREATE_BLOCK_DEVICE:
case CREATE_CHAR_DEVICE: {
@@ -1135,10 +1144,17 @@ static int parse_line(const char *fname, unsigned line, const char *buffer) {
return -EIO;
}
- if (strlen(action) > 2 || (strlen(action) > 1 && action[1] != '!')) {
- log_error("[%s:%u] Unknown modifier '%s'", fname, line, action);
+ if (isempty(action)) {
+ log_error("[%s:%u] Command too short '%s'.", fname, line, action);
return -EINVAL;
- } else if (strlen(action) > 1 && !arg_boot)
+ }
+
+ if (strlen(action) > 1 && !in_charset(action+1, "!+")) {
+ log_error("[%s:%u] Unknown modifiers in command '%s'", fname, line, action);
+ return -EINVAL;
+ }
+
+ if (strchr(action+1, '!') && !arg_boot)
return 0;
type = action[0];
@@ -1147,6 +1163,8 @@ static int parse_line(const char *fname, unsigned line, const char *buffer) {
if (!i)
return log_oom();
+ i->force = !!strchr(action+1, '+');
+
r = specifier_printf(path, specifier_table, NULL, &i->path);
if (r < 0) {
log_error("[%s:%u] Failed to replace specifiers: %s", fname, line, path);
diff --git a/tmpfiles.d/etc.conf b/tmpfiles.d/etc.conf
index 1294c9408b..e809dff2aa 100644
--- a/tmpfiles.d/etc.conf
+++ b/tmpfiles.d/etc.conf
@@ -9,5 +9,5 @@
L /etc/os-release - - - - ../usr/lib/os-release
L /etc/localtime - - - - ../usr/share/zoneinfo/UTC
-L /etc/mtab - - - - ../proc/self/mounts
+L+ /etc/mtab - - - - ../proc/self/mounts
L /etc/resolv.conf - - - - ../run/systemd/resolve/resolv.conf
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-07-23 21:14:32 +0000