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systemd-tmpfiles: allow appending content to file

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Adds support to append to files with w+ type.

 w /tmp/13291.out - - - - first line\n
 w+ /tmp/13291.out - - - - second line\n
This commit is contained in:
Zach Smith 2019-10-03 18:19:18 -07:00
parent c55ac24825
commit d0ea5c5e39
2 changed files with 13 additions and 11 deletions
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16
man/tmpfiles.d.xml
View File

@ -51,7 +51,7 @@ p /fifo/to/create mode user group - -
L /symlink/to/create - - - - symlink/target/path
c /dev/char-device-to-create mode user group - -
b /dev/block-device-to-create mode user group - -
# p+, L+, c+, b+ create target unconditionally
# p+, L+, c+, b+ create target unconditionally, w+ appends to the file
C /target/to/create - - - - /source/to/copy
x /path-or-glob/to/ignore - - - - -
X /path-or-glob/to/ignore/recursively - - - - -
@ -167,13 +167,13 @@ L /tmp/foobar - - - - /dev/null</programlisting>
</varlistentry>
<varlistentry>
<term><varname>w</varname></term>
<listitem><para>Write the argument parameter to a file, if
the file exists. Lines of this type accept shell-style
globs in place of normal path names. The argument parameter
will be written without a trailing newline. C-style
backslash escapes are interpreted. Follows
symlinks.</para></listitem>
<term><varname>w, w+</varname></term>
<listitem><para>Write the argument parameter to a file, if the file exists.
If suffixed with <varname>+</varname>, the line will be appended to the file.
If your configuration writes multiple lines to the same file, use <varname>w+</varname>.
Lines of this type accept shell-style globs in place of normal path names.
The argument parameter will be written without a trailing newline.
C-style backslash escapes are interpreted. Follows symlinks.</para></listitem>
</varlistentry>
<varlistentry>

8
src/tmpfiles/tmpfiles.c
View File

@ -1257,7 +1257,7 @@ static int path_set_attribute(Item *item, const char *path) {
static int write_one_file(Item *i, const char *path) {
_cleanup_close_ int fd = -1, dir_fd = -1;
char *bn;
int r;
int flags, r;
assert(i);
assert(path);
@ -1272,8 +1272,10 @@ static int write_one_file(Item *i, const char *path) {
bn = basename(path);
flags = O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY;
/* Follows symlinks */
fd = openat(dir_fd, bn, O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
fd = openat(dir_fd, bn, i->append_or_force ? flags|O_APPEND : flags, i->mode);
if (fd < 0) {
if (errno == ENOENT) {
log_debug_errno(errno, "Not writing missing file \"%s\": %m", path);
@ -2794,7 +2796,7 @@ static int parse_line(const char *fname, unsigned line, const char *buffer, bool
size_t n;
for (n = 0; n < existing->n_items; n++) {
if (!item_compatible(existing->items + n, &i)) {
if (!item_compatible(existing->items + n, &i) && !i.append_or_force) {
log_notice("[%s:%u] Duplicate line for path \"%s\", ignoring.",
fname, line, i.path);
return 0;