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fs-up.c
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fs-up.c
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/*
* Copyright (c) 2009 - 2011 Miek Gieben
* See LICENSE for the license
* rdup-up -- update an directory tree with
* and rdup archive
*
* File related functions
*
*/
#include "rdup-up.h"
#include "protocol.h"
extern int sig;
extern gboolean opt_dry;
extern gboolean opt_table;
extern gboolean opt_quiet;
extern gboolean opt_chown;
extern guint opt_strip;
extern gint opt_verbose;
extern GSList *hlink_list;
/* signal.c */
void got_sig(int signal);
/* common.c */
struct rdup * entry_dup(struct rdup *);
void entry_free(struct rdup *);
static gboolean
mk_time(struct rdup *e)
{
struct utimbuf ut;
/* we don't carry the a_time, how cares anyway with noatime? */
ut.actime = ut.modtime = e->f_mtime;
if (utime(e->f_name, &ut) == -1)
msgd(__func__, __LINE__,_("Failed to set mtime '%s\': %s"), e->f_name, strerror(errno));
return TRUE;
}
static gboolean
mk_chown(struct rdup *e, GHashTable *uidhash, GHashTable *gidhash)
{
uid_t u; gid_t g;
u = lookup_uid(uidhash, e->f_user, e->f_uid);
g = lookup_gid(gidhash, e->f_group, e->f_gid);
if (lchown(e->f_name, u, g) == -1) {
if (opt_chown) {
/* chown failed, use and create ._rdup_. - file, it that fails too
* we're out of luck - so we don't care about the return value */
if (S_ISDIR(e->f_mode)) {
chown_write(e->f_name, NULL, e->f_uid, e->f_user, e->f_gid, e->f_group);
} else {
chown_write(dirname(e->f_name), basename(e->f_name), e->f_uid, e->f_user, e->f_gid, e->f_group);
}
} else {
if (!opt_quiet) {
msgd(__func__, __LINE__,_("Failed to chown `%s\': %s"), e->f_name, strerror(errno));
}
}
}
return TRUE;
}
static gboolean
mk_mode(struct rdup *e)
{
chmod(e->f_name, e->f_mode);
return TRUE;
}
static gboolean
mk_meta(struct rdup *e, GHashTable *uidhash, GHashTable *gidhash)
{
mk_mode(e);
mk_chown(e, uidhash, gidhash);
mk_time(e);
return TRUE;
}
static gboolean
mk_dev(struct rdup *e, GHashTable *uidhash, GHashTable *gidhash)
{
gchar *parent;
struct stat *st;
if (opt_dry)
return TRUE;
if (!rm(e->f_name))
return FALSE;
if (mknod(e->f_name, e->f_mode, e->f_rdev) == -1) {
if (errno == EACCES) {
parent = dir_parent(e->f_name);
st = dir_write(parent);
if (mknod(e->f_name, e->f_mode, e->f_rdev) == -1) {
msgd(__func__, __LINE__, _("Failed to make device `%s\': %s"), e->f_name, strerror(errno));
dir_restore(parent, st);
g_free(parent);
return FALSE;
}
dir_restore(parent, st);
g_free(parent);
} else {
msgd(__func__, __LINE__, _("Failed to make device `%s\': %s"), e->f_name, strerror(errno));
return FALSE;
}
}
mk_meta(e, uidhash, gidhash);
return TRUE;
}
static gboolean
mk_sock(struct rdup *e, GHashTable *uidhash, GHashTable *gidhash)
{
gchar *parent;
struct stat *st;
if (opt_dry)
return TRUE;
if (!rm(e->f_name))
return FALSE;
if (mkfifo(e->f_name, e->f_mode) == -1) {
if (errno == EACCES) {
parent = dir_parent(e->f_name);
st = dir_write(parent);
if (mkfifo(e->f_name, e->f_mode) == -1) {
msgd(__func__, __LINE__, _("Failed to make socket `%s\': %s"), e->f_name, strerror(errno));
dir_restore(parent, st);
g_free(parent);
return FALSE;
}
dir_restore(parent, st);
g_free(parent);
} else {
msgd(__func__, __LINE__, _("Failed to make socket `%s\': %s"), e->f_name, strerror(errno));
return FALSE;
}
}
mk_meta(e, uidhash, gidhash);
return TRUE;
}
static gboolean
mk_link(struct rdup *e, char *p, GHashTable *uidhash, GHashTable *gidhash)
{
struct stat *st;
gchar *t;
gchar *parent;
if (opt_dry)
return TRUE;
if (!rm(e->f_name))
return FALSE;
/* symlink */
if (S_ISLNK(e->f_mode)) {
if (symlink(e->f_target, e->f_name) == -1) {
if (errno == EACCES) {
parent = dir_parent(e->f_name);
st = dir_write(parent);
if (symlink(e->f_target, e->f_name) == -1) {
msgd(__func__, __LINE__, _("Failed to make symlink `%s -> %s\': %s"), e->f_name, e->f_target, strerror(errno));
dir_restore(parent, st);
g_free(parent);
return FALSE;
}
dir_restore(parent, st);
g_free(parent);
} else {
msgd(__func__, __LINE__, _("Failed to make symlink `%s -> %s\': %s"), e->f_name, e->f_target, strerror(errno));
return FALSE;
}
}
mk_chown(e, uidhash, gidhash);
return TRUE;
}
/* hardlink */
/* target must also fall in backup dir */
t = g_strdup_printf("%s%s", p, e->f_target);
e->f_target = t;
hlink_list = g_slist_append(hlink_list, entry_dup(e));
return TRUE;
}
static gboolean
mk_reg(FILE *in, struct rdup *e, GHashTable *uidhash, GHashTable *gidhash)
{
FILE *out = NULL;
char *buf;
gchar *parent;
size_t bytes;
gboolean ok = TRUE;
gboolean old_dry = opt_dry;
struct stat *st;
/* with opt_dry we can't just return TRUE; as we may
* need to suck in the file's content - which is thrown
* away in that case */
if (! e->f_name) {
/* fake an opt_dry */
opt_dry = TRUE;
}
if (!opt_dry) {
if (!rm(e->f_name)) {
opt_dry = old_dry;
return FALSE;
}
}
if (!opt_dry && !(out = fopen(e->f_name, "w"))) {
if (errno == EACCES) {
parent = dir_parent(e->f_name);
st = dir_write(parent);
if (!(out = fopen(e->f_name, "w"))) {
msgd(__func__, __LINE__, _("Failed to open file `%s\': %s"), e->f_name, strerror(errno));
g_free(parent);
ok = FALSE;
}
dir_restore(parent, st);
g_free(parent);
} else {
msgd(__func__, __LINE__, _("Failed to open file `%s\': %s"), e->f_name, strerror(errno));
ok = FALSE;
}
}
/* we need to read the input to not upset
* the flow into rdup-up, but we are not
* creating anything when opt_dry is active
*/
buf = g_malloc(BUFSIZE + 1);
while ((bytes = block_in_header(in)) > 0) {
if (block_in(in, bytes, buf) == -1) {
if (out)
fclose(out);
opt_dry = old_dry;
g_free(buf);
return FALSE;
}
if (ok && !opt_dry) {
if (fwrite(buf, sizeof(char), bytes, out) != bytes) {
msgd(__func__, __LINE__, _("Write failure `%s\': %s"), e->f_name, strerror(errno));
if (out)
fclose(out);
opt_dry = old_dry;
g_free(buf);
return FALSE;
}
}
}
g_free(buf);
if (ok && out)
fclose(out);
if (ok && !opt_dry)
mk_meta(e, uidhash, gidhash);
#ifdef DEBUG
msgd(__func__, __LINE__, "Wrote file `%s\'", e->f_name);
#endif /* DEBUG */
opt_dry = old_dry;
return TRUE;
}
static gboolean
mk_dir(struct rdup *e, GHashTable *uidhash, GHashTable *gidhash)
{
struct stat *s;
struct stat st;
gchar *parent;
if (opt_dry)
return TRUE;
if (lstat(e->f_name, &st) == 0) {
if (S_ISDIR(st.st_mode)) {
#if 0
msgd(__func__, __LINE__, _("Updating current dir `%s\'"), e->f_name);
#endif /* DEBUG */
/* some dir is here - update the perms and ownership */
mk_meta(e, uidhash, gidhash);
return TRUE;
}
}
/* nothing there */
if (mkdir(e->f_name, e->f_mode) == -1) {
if (errno == EACCES) {
/* make parent dir writable, and try again */
parent = dir_parent(e->f_name);
#ifdef DEBUG
msgd(__func__, __LINE__, _("EACCES for `%s\'"), parent);
#endif /* DEBUG */
s = dir_write(parent);
if (!s)
msgd(__func__, __LINE__, _("Failed to make parent writable"));
if (mkdir(e->f_name, e->f_mode) == -1) {
msgd(__func__, __LINE__, _("Failed to create directory `%s\': %s"), e->f_name, strerror(errno));
dir_restore(parent, s);
g_free(parent);
return FALSE;
}
dir_restore(parent, s);
g_free(parent);
} else {
msgd(__func__, __LINE__, _("Failed to create directory `%s\': %s"), e->f_name, strerror(errno));
return FALSE;
}
}
mk_meta(e, uidhash, gidhash);
return TRUE;
}
/* make (or delete) an object in the filesystem */
gboolean
mk_obj(FILE *in, char *p, struct rdup *e, GHashTable *uidhash, GHashTable *gidhash)
{
if (opt_verbose >= 1 && e->f_name) {
if (S_ISLNK(e->f_mode) || e->f_lnk)
fprintf(stderr, "%s -> %s\n", e->f_name, e->f_target);
else
fprintf(stderr, "%s\n", e->f_name);
}
if (opt_table)
rdup_write_table(e, stdout);
/* split here - or above - return when path is zero length
* for links check that the f_size is zero */
switch(e->plusmin) {
case MINUS:
if (opt_dry || ! e->f_name)
return TRUE;
return rm(e->f_name);
case PLUS:
/* opt_dry handled within the subfunctions */
/* only files, no hardlinks! */
if (S_ISREG(e->f_mode) && ! e->f_lnk )
return mk_reg(in, e, uidhash, gidhash);
/* no name, we can exit here - for files this is handled
* in mk_reg, because we may need to suck in data */
if (e->f_name == NULL)
return TRUE;
if (S_ISDIR(e->f_mode))
return mk_dir(e, uidhash, gidhash);
/* First sym and hardlinks and then regular files */
if (S_ISLNK(e->f_mode) || e->f_lnk)
return mk_link(e, p, uidhash, gidhash);
if (S_ISBLK(e->f_mode) || S_ISCHR(e->f_mode))
return mk_dev(e, uidhash, gidhash);
if (S_ISSOCK(e->f_mode))
return mk_sock(e, uidhash, gidhash);
if (S_ISFIFO(e->f_mode))
return mk_sock(e, uidhash, gidhash);
}
/* only reached during the heat death of the universe */
return TRUE;
}
/* Create the remaining hardlinks in the target directory */
gboolean
mk_hlink(GSList *h)
{
struct rdup *e;
GSList *p;
struct stat *st;
gchar *parent;
if (opt_dry)
return TRUE;
for (p = g_slist_nth(h, 0); p; p = p->next) {
e = (struct rdup *)p->data;
if (link(e->f_target, e->f_name) == -1) {
if (errno == EACCES) {
parent = dir_parent(e->f_name);
st = dir_write(parent);
if (link(e->f_target, e->f_name) == -1) {
msgd(__func__, __LINE__, _("Failed to create hardlink `%s -> %s\': %s"),
e->f_name, e->f_target, strerror(errno));
dir_restore(parent, st);
g_free(parent);
return FALSE;
}
dir_restore(parent, st);
g_free(parent);
return TRUE;
} else {
msgd(__func__, __LINE__, _("Failed to create hardlink `%s -> %s\': %s"),
e->f_name, e->f_target, strerror(errno));
return FALSE;
}
}
entry_free(e);
}
return TRUE;
}