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Clean /tmp on boot.

This commit is contained in:
Nicholas De Nova 2017-04-19 08:56:53 -05:00
parent 326e43f3e9
commit 8b64b4bbbe
2 changed files with 131 additions and 0 deletions
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5
init/init.8
View File

@ -84,6 +84,11 @@ command line if it hasn't been password protected.
Likewise unprivileged users can use their own replacement bootloader by booting
a portable device under their control if the firmware configuration has not been
password protected.
.Ss Cleanup of /tmp
.Nm
deletes everything inside of
.Pa /tmp
if it exists, otherwise it is created with mode 1777.
.Ss Partition Creation
.Nm
will scan every block device for valid partition tables and create the

126
init/init.c
View File

@ -538,6 +538,131 @@ static void set_videomode(void)
xres, yres, bpp);
}
static int no_dot_nor_dot_dot(const struct dirent* entry, void* ctx)
{
(void) ctx;
return !strcmp(entry->d_name, ".") || !strcmp(entry->d_name, "..") ? 0 : 1;
}
struct clean_tmp
{
struct clean_tmp* parent;
DIR* dir;
char* path;
struct dirent** entries;
int num_entries;
int current_entry;
};
static void clean_tmp(void)
{
const char* tmp_path = "/tmp";
struct clean_tmp* state = calloc(1, sizeof(struct clean_tmp));
if ( !state )
{
warning("malloc: %m");
return;
}
state->path = strdup(tmp_path);
if ( !state->path )
{
warning("malloc: %m");
free(state);
return;
}
state->dir = opendir(state->path);
if ( !state->dir )
{
warning("%s: %m", state->path);
free(state->path);
free(state);
return;
}
while ( state )
{
if ( !state->entries )
{
state->num_entries = dscandir_r(state->dir, &state->entries,
no_dot_nor_dot_dot, NULL,
alphasort_r, NULL);
if ( state->num_entries < 0 )
warning("%s: %m", state->path);
}
if ( state->num_entries <= state->current_entry )
{
closedir(state->dir);
for ( int i = 0; i < state->num_entries; i++ )
free(state->entries[i]);
free(state->entries);
free(state->path);
struct clean_tmp* new_state = state->parent;
free(state);
state = new_state;
if ( state )
{
struct dirent* entry = state->entries[state->current_entry];
const char* name = entry->d_name;
int fd = dirfd(state->dir);
if ( unlinkat(fd, name, AT_REMOVEDIR) < 0 )
warning("%s/%s: %m", state->path, name);
state->current_entry++;
}
continue;
}
struct dirent* entry = state->entries[state->current_entry];
const char* name = entry->d_name;
int fd = dirfd(state->dir);
if ( unlinkat(fd, name, AT_REMOVEFILE | AT_REMOVEDIR) < 0 )
{
if ( errno == ENOTEMPTY )
{
struct clean_tmp* new_state =
calloc(1, sizeof(struct clean_tmp));
if ( !new_state )
{
warning("%s/%s: malloc: %m", state->path, name);
state->current_entry++;
continue;
}
new_state->path = join_paths(state->path, name);
if ( !new_state->path )
{
warning("%s/%s: malloc: %m", state->path, name);
free(new_state);
state->current_entry++;
continue;
}
int flags = O_DIRECTORY | O_RDONLY | O_NOFOLLOW;
int newfd = openat(fd, new_state->path, flags);
if ( newfd < 0 )
{
warning("%s: %m", new_state->path);
free(new_state->path);
free(new_state);
state->current_entry++;
continue;
}
new_state->dir = fdopendir(newfd);
if ( !new_state->dir )
{
warning("%s: %m", new_state->path);
close(newfd);
free(new_state->path);
free(new_state);
state->current_entry++;
continue;
}
new_state->parent = state;
state = new_state;
continue;
}
else
warning("%s/%s: %m", state->path, name);
}
state->current_entry++;
}
}
static void init_early(void)
{
static bool done = false;
@ -548,6 +673,7 @@ static void init_early(void)
// Make sure that we have a /tmp directory.
umask(0000);
mkdir("/tmp", 01777);
clean_tmp();
// Set the default file creation mask.
umask(0022);