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bootctl: create loader.conf only if it doesn't exist yet

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If the snippet aleady exists, don't do anything, as the file was already
installed then.

(This also reworks the code to create the file atomically)

Fixes: #5396
This commit is contained in:
Lennart Poettering 2017-02-21 17:44:35 +01:00
parent 175d308cad
commit f5b84de2ab
2 changed files with 31 additions and 6 deletions
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6
src/basic/fs-util.h
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@ -91,3 +91,9 @@ static inline void rmdir_and_free(char *p) {
free(p);
}
DEFINE_TRIVIAL_CLEANUP_FUNC(char*, rmdir_and_free);
static inline void unlink_and_free(char *p) {
(void) unlink(p);
free(p);
}
DEFINE_TRIVIAL_CLEANUP_FUNC(char*, unlink_and_free);

31
src/boot/bootctl.c
View File

@ -913,20 +913,31 @@ static int remove_variables(sd_id128_t uuid, const char *path, bool in_order) {
static int install_loader_config(const char *esp_path) {
_cleanup_fclose_ FILE *f = NULL;
char machine_string[SD_ID128_STRING_MAX];
_cleanup_(unlink_and_freep) char *t = NULL;
_cleanup_fclose_ FILE *f = NULL;
sd_id128_t machine_id;
const char *p;
int r;
int r, fd;
r = sd_id128_get_machine(&machine_id);
if (r < 0)
return log_error_errno(r, "Failed to get machine did: %m");
p = strjoina(esp_path, "/loader/loader.conf");
f = fopen(p, "wxe");
if (!f)
return log_error_errno(errno, "Failed to open loader.conf for writing: %m");
if (access(p, F_OK) >= 0) /* Silently skip creation if the file already exists (early check) */
return 0;
fd = open_tmpfile_linkable(p, O_WRONLY|O_CLOEXEC, &t);
if (fd < 0)
return log_error_errno(fd, "Failed to open \"%s\" for writing: %m", p);
f = fdopen(fd, "we");
if (!f) {
safe_close(fd);
return log_oom();
}
fprintf(f, "#timeout 3\n");
fprintf(f, "default %s-*\n", sd_id128_to_string(machine_id, machine_string));
@ -935,7 +946,15 @@ static int install_loader_config(const char *esp_path) {
if (r < 0)
return log_error_errno(r, "Failed to write \"%s\": %m", p);
return 0;
r = link_tmpfile(fd, t, p);
if (r == -EEXIST)
return 0; /* Silently skip creation if the file exists now (recheck) */
if (r < 0)
return log_error_errno(r, "Failed to move \"%s\" into place: %m", p);
t = mfree(t);
return 1;
}
static int help(int argc, char *argv[], void *userdata) {