libburnia/legacy
2
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Allowing to restore from image with pending changes

Browse Source
This commit is contained in:
Thomas Schmitt
2008-06-09 13:44:06 +00:00
parent da45d5bc8c
commit 1418922245
6 changed files with 264 additions and 34 deletions
Download Patch File Download Diff File Expand all files Collapse all files

154
libisoburn/trunk/xorriso/xorrisoburn.c
View File

@ -2436,6 +2436,72 @@ unsupported_type:;
}
/* @param flag bit0= in_node is valid, do not resolve img_path
bit1= test mode: print DEBUG messages
@return <0 = error, 0 = not identical regular files , 1 = identical
2 = potentially depending on unknown disk file (e.g. -cut_out)
and hitting an existing disk file object
*/
int Xorriso_restore_is_identical(struct XorrisO *xorriso, void *in_node,
char *img_path, char *disk_path,
char type_text[5], int flag)
{
int ret;
unsigned int fs_id;
dev_t dev_id;
ino_t ino_id;
uint32_t dummy;
IsoStream *stream;
IsoImage *volume;
IsoNode *node;
struct stat stbuf;
memset(type_text, 0, 5);
if(flag&1) {
node= (IsoNode *) in_node;
} else {
ret= Xorriso_get_volume(xorriso, &volume, 0);
if(ret<=0)
return(-1);
ret= Xorriso_node_from_path(xorriso, volume, img_path, &node, 1);
if(ret<=0)
return(-1);
}
ret= iso_node_get_old_image_lba(node, &dummy, 0);
if(ret!=0)
return(0);
if(!LIBISO_ISREG(node))
return(0);
stream= iso_file_get_stream((IsoFile *) node);
memcpy(type_text, stream->class->type, 4);
iso_stream_get_id(stream, &fs_id, &dev_id, &ino_id);
if(flag&2) {
sprintf(xorriso->info_text, "%s : fs=%d dev=%.f ino=%.f (%s)",
img_path, fs_id, (double) dev_id, (double) ino_id, type_text);
Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "DEBUG", 0);
}
ret= stat(disk_path, &stbuf);
if(ret==-1)
return(0);
if(flag&2) {
sprintf(xorriso->info_text, "%s : dev=%.f ino=%.f",
disk_path, (double) stbuf.st_dev, (double) stbuf.st_ino);
Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "DEBUG", 0);
}
if(fs_id!=1)
return(2);
/* >>> obtain underlying dev_t ino_t of type "cout" */;
if(strcmp(type_text, "fsrc")!=0)
return(2);
if(stbuf.st_dev==dev_id && stbuf.st_ino==ino_id)
return(1);
return(0);
}
/* @param flag bit0= minimal transfer: access permissions only
bit1= keep directory open: keep owner, allow rwx for owner
and push directory onto xorriso->perm_stack
@ -2575,13 +2641,14 @@ int Xorriso_tree_restore_node(struct XorrisO *xorriso, IsoNode *node,
{
int ret= 0, write_fd= -1, wanted, wret, open_flags;
char *what= "[unknown filetype]", sfe[5*SfileadrL], sfe2[5*SfileadrL];
char buf[32*1024];
char *link_target;
char buf[32*1024], type_text[5], temp_path[SfileadrL];
char *link_target, *open_path_pt;
off_t todo, size, seek_ret;
void *data_stream= NULL;
mode_t mode;
dev_t dev= 0;
struct stat stbuf;
struct utimbuf utime_buffer;
if(LIBISO_ISDIR(node)) {
what= "directory";
@ -2592,12 +2659,13 @@ int Xorriso_tree_restore_node(struct XorrisO *xorriso, IsoNode *node,
/* >>> need to exploit node rather than img_path */
ret= Xorriso_iso_file_open(xorriso, img_path, &data_stream, 0);
if(ret<=0)
goto ex;
open_flags= O_WRONLY|O_CREAT;
open_path_pt= disk_path;
ret= stat(open_path_pt, &stbuf);
if(flag&2) {
ret= stat(disk_path, &stbuf);
if(ret!=-1 && !S_ISREG(stbuf.st_mode)) {
sprintf(xorriso->info_text,
"Restore offset demanded. But filesystem path leads to non-data file %s",
@ -2605,20 +2673,42 @@ int Xorriso_tree_restore_node(struct XorrisO *xorriso, IsoNode *node,
Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, errno, "FAILURE",0);
goto cannot_restore;
}
} else {
/* If source and target are the same disk file then do not copy content */
ret= Xorriso_restore_is_identical(xorriso, (void *) node, img_path,
disk_path, type_text, 1);
if(ret<0)
goto ex;
if(ret==1) {
/* preliminarily emulate touch (might get overridden later) */
utime_buffer.actime= stbuf.st_atime;
utime_buffer.modtime= time(0);
utime(disk_path,&utime_buffer);
goto restore_properties;
}
if(ret==2) {
/* Extract to temporary file and rename only after copying */
ret= Xorriso_make_tmp_path(xorriso, disk_path, temp_path, &write_fd, 0);
if(ret<=0)
goto ex;
open_path_pt= temp_path;
}
}
if(write_fd==-1) {
open_flags= O_WRONLY|O_CREAT;
if(offset==0 || !(flag&2))
open_flags|= O_EXCL;
write_fd= open(open_path_pt, open_flags, S_IRUSR|S_IWUSR);
if(write_fd==-1)
goto cannot_restore;
}
if(offset==0 || !(flag&2))
open_flags|= O_EXCL;
write_fd= open(disk_path, open_flags, S_IRUSR|S_IWUSR);
if(write_fd==-1)
goto cannot_restore;
if(flag&2) {
todo= size= bytes;
seek_ret= lseek(write_fd, offset, SEEK_SET);
if(seek_ret == -1) {
sprintf(xorriso->info_text,
"Cannot address byte %.f in filesystem path %s",
(double) offset, Text_shellsafe(disk_path, sfe, 0));
(double) offset, Text_shellsafe(open_path_pt, sfe, 0));
Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, errno, "FAILURE",0);
goto cannot_restore;
}
@ -2637,7 +2727,7 @@ int Xorriso_tree_restore_node(struct XorrisO *xorriso, IsoNode *node,
if(wret != ret) {
sprintf(xorriso->info_text,
"Cannot write all bytes to disk filesystem path %s",
Text_shellsafe(disk_path, sfe, 0));
Text_shellsafe(open_path_pt, sfe, 0));
Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, errno, "FAILURE",0);
break;
}
@ -2646,6 +2736,18 @@ int Xorriso_tree_restore_node(struct XorrisO *xorriso, IsoNode *node,
write_fd= -1;
Xorriso_iso_file_close(xorriso, &data_stream, 0);
data_stream= NULL;
if(temp_path==open_path_pt) {
ret= rename(temp_path, disk_path);
if(ret==-1) {
sprintf(xorriso->info_text,
"Cannot rename temporary path %s to final disk path %s",
Text_shellsafe(temp_path, sfe, 0),
Text_shellsafe(disk_path, sfe2, 0));
Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, errno, "FAILURE",0);
unlink(temp_path);
ret= 0; goto ex;
}
}
ret= (todo==0);
} else if(LIBISO_ISLNK(node)) {
@ -2727,6 +2829,8 @@ cannot_restore:;
Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, errno, "FAILURE", 0);
ret= 0; goto ex;
}
restore_properties:;
if((flag&8) || LIBISO_ISLNK(node))
ret= 1;
else
@ -2741,20 +2845,30 @@ ex:;
/* Handle overwrite situation in disk filesystem.
@param node intended source of overwriting or NULL
@param flag
bit4= return 3 on rejection by exclusion or user
*/
int Xorriso_restore_overwrite(struct XorrisO *xorriso, char *img_path,
int Xorriso_restore_overwrite(struct XorrisO *xorriso,
IsoNode *node, char *img_path,
char *path, char *nominal_path,
struct stat *stbuf, int flag)
{
int ret;
char sfe[5*SfileadrL], sfe2[5*SfileadrL];
char sfe[5*SfileadrL], sfe2[5*SfileadrL], type_text[5];
Xorriso_process_msg_queues(xorriso,0);
if(xorriso->do_overwrite==1 ||
(xorriso->do_overwrite==2 && !S_ISDIR(stbuf->st_mode))) {
ret= Xorriso_rmx(xorriso, (off_t) 0, path, 1|8);
ret= Xorriso_restore_is_identical(xorriso, (void *) node, img_path,
path, type_text, (node!=NULL));
if(ret<0)
return(ret);
if(ret>0) /* will be handled properly by restore functions */
ret= Xorriso_reassure_restore(xorriso, path, 8);
else
ret= Xorriso_rmx(xorriso, (off_t) 0, path, 8);
if(ret<=0)
return(ret);
if(ret==3) {
@ -3055,11 +3169,11 @@ much_too_long:;
target_is_dir= S_ISDIR(target_stbuf.st_mode);
if(!(target_is_dir && (source_is_dir && !source_is_split))) {
Xorriso_process_msg_queues(xorriso,0);
ret= Xorriso_restore_overwrite(xorriso, img_path, disk_path, disk_path,
&target_stbuf, 0);
ret= Xorriso_restore_overwrite(xorriso, node, img_path, disk_path,
disk_path, &target_stbuf, 0);
if(ret<=0)
goto was_problem;
stbuf_ret= -1;
stbuf_ret= -1; /* It might still exist but will be handled properly */
}
}
@ -3218,11 +3332,11 @@ int Xorriso_restore(struct XorrisO *xorriso,
if(stbuf_ret!=-1) {
target_is_dir= S_ISDIR(target_stbuf.st_mode);
if(!(target_is_dir && (source_is_dir && !source_is_split))) {
ret= Xorriso_restore_overwrite(xorriso, img_path, path, disk_path,
ret= Xorriso_restore_overwrite(xorriso, node, img_path, path, disk_path,
&target_stbuf, flag&16);
if(ret<=0 || ret==3)
goto ex;
stbuf_ret= -1; /* now it is removed */
stbuf_ret= -1; /* now it is removed (or can be handled properly) */
}
}
new_dir_made= 0;