LIBS = $(shell pkg-config gnome-desktop-3.0 --libs) $(shell pkg-config gnome-vfs-2.0 --libs)
INCL = $(shell pkg-config gnome-desktop-3.0 --cflags) $(shell pkg-config gnome-vfs-2.0 --cflags)
CXXFLAGS = -O2 -g -Wall $(INCL) -DGNOME_DESKTOP_USE_UNSTABLE_API
OBJS = thumb-sampl3.o
TARGET = thumb-sampl3
$(TARGET): $(OBJS)
$(CXX) -o $(TARGET) $(OBJS) $(LIBS)
all: $(TARGET)
clean:
rm -f $(OBJS) $(TARGET)
#include <iostream>
#include <ctime>
#include <sys/stat.h>
#include <libgnome-desktop/gnome-desktop-thumbnail.h>
#include <libgnomevfs/gnome-vfs-mime.h>
using namespace std;
int main(int argc, char **argv) {
GnomeDesktopThumbnailFactory *thumbnail_factory;
char *fpath;
char *uri;
time_t mtime;
const char *mime_type;
if (argc!=2) {
cerr << "No input file" << endl;
return 1;
}
fpath = argv[1];
cerr << "filepath: " << fpath << endl;
thumbnail_factory = gnome_desktop_thumbnail_factory_new (GNOME_DESKTOP_THUMBNAIL_SIZE_LARGE);
if (!thumbnail_factory) {
cerr << "cannot initialize" << endl;
return 1;
}
cerr << "initialized with GNOME_DESKTOP_THUMBNAIL_SIZE_LARGE set to: ";
cerr << GNOME_DESKTOP_THUMBNAIL_SIZE_LARGE << endl;
GFile *loc;
loc = g_file_new_for_path(fpath);
uri = g_file_get_uri (loc);
cerr << "uri: " << uri << endl;
mime_type = gnome_vfs_mime_type_from_name(fpath);
cerr << "mime_type: " << mime_type << endl;
struct stat finfo;
if (stat(fpath, &finfo)==0) {
mtime = finfo.st_mtim.tv_sec;
} else {
cerr << "cannot get mtime of file" << endl;
return 1;
}
cerr << "mtime: " << mtime << endl;
gboolean res;
res = gnome_desktop_thumbnail_factory_can_thumbnail (thumbnail_factory,
uri,
mime_type,
mtime);
cerr << "can thumbnail res: " << res << endl;
GdkPixbuf *pixbuf;
pixbuf = gnome_desktop_thumbnail_factory_generate_thumbnail (thumbnail_factory,
uri,
mime_type);
cerr << "generated pixbuf??: " << (!pixbuf==NULL) << endl;
if (pixbuf) {
gnome_desktop_thumbnail_factory_save_thumbnail (thumbnail_factory,
pixbuf,
uri,
mtime);
cerr << "after save_thumbnail" << endl;
g_object_unref (pixbuf);
} else {
//gnome_desktop_thumbnail_factory_create_failed_thumbnail (thumbnail_factory,
// uri,
// mtime);
//cerr << "after create_failed_thumbnail" << endl;
cerr << "calling create_failed_thumbnail skipped" << endl;
}
//g_free (mime_type);
g_free (uri);
}
./thumb-sampl3 /home/djbuldog/Pictures/Snímek\ z\ 2014-11-18\ 20\:27\:27.png
filepath: /home/djbuldog/Pictures/Snímek z 2014-11-18 20:27:27.png
initialized with GNOME_DESKTOP_THUMBNAIL_SIZE_LARGE set to: 1
uri: file:///home/djbuldog/Pictures/Sn%C3%ADmek%20z%202014-11-18%2020:27:27.png
mime_type: image/png
mtime: 1416338848
can thumbnail res: 1
generated pixbuf??: 0
calling create_failed_thumbnail skipped
spuštění strace mi taky moc neřeklo
spuštění programu na virtuálním debian fungovalo a náhled vytvořilo
z porovnání strace jsem zjistil že:
virtuální debian soubor s png obrázkem otevřel a následně načítal knihovnu libpixbufloader-png.so
potom soubor s obrázkem celý přečetl
pharaon soubor vůbec neotevřel snažil se otevírat nějaký soubor flatpak-info
strace -vf -s 1024 ./thumb-sampl3 /home/djbuldog/Pictures/Snímek\ z\ 2014-11-18\ 20\:27\:27.png
..
pid 15953] execve("/usr/bin/bwrap", ["bwrap", "--ro-bind", "/usr", "/usr", "--ro-bind", "/lib", "/lib", "--ro-bind", "/lib64", "/lib64", "--proc", "/proc", "--dev", "/dev", "--symlink", "usr/bin", "/bin", "--symlink", "usr/sbin", "/sbin", "--chdir", "/", "--setenv", "GIO_USE_VFS", "local", "--unshare-all", "--die-with-parent", "--bind", "/tmp/gnome-desktop-thumbnailer-YVNH9Y", "/tmp", "--ro-bind", "/home/djbuldog/Pictures/Sn\303\255mek z 2014-11-18 20:27:27.png", "/tmp/gnome-desktop-file-to-thumbnail.png", "--seccomp", "5", "/usr/bin/gdk-pixbuf-thumbnailer", "-s", "256", "file:///tmp/gnome-desktop-file-to-thumbnail.png", "/tmp/gnome-desktop-thumbnailer.png"], ["WINDOW_MANAGER=/usr/bin/compiz", .....
...
pid 15953] write(2, "Creating new namespace failed, likely because the kernel does not support user namespaces. bwrap must be installed setuid on such systems.", 139 <unfinished ...>
..
-
dělá to asi kvůli zvýšení bezpečnosti
kontroloval jsem, že bwrap má nastaven setuidbit, ale v kernel ty user namespaces (CONFIG_USER_NS) nemám
zapnutí v kernel napomohlo :D
debian prý by default blokuje user namespaces přes sysctl
tohle se snaží udělat thumbnail-factory
mkdir /tmp/gnome-desktop-thumbnailer-Y8FU9Y
"/usr/bin/bwrap" "--ro-bind" "/usr" "/usr" "--ro-bind" "/lib" "/lib" "--ro-bind" "/lib64" "/lib64" "--proc" "/proc" "--dev" "/dev" "--symlink" "usr/bin" "/bin" "--symlink" "usr/sbin" "/sbin" "--chdir" "/" "--setenv" "GIO_USE_VFS" "local" "--unshare-all" "--die-with-parent" "--bind" "/tmp/gnome-desktop-thumbnailer-Y8FU9Y" "/tmp" "--ro-bind" "/home/djbuldog/Pictures/Sn\303\255mek z 2014-11-18 20:27:27.png" "/tmp/gnome-desktop-file-to-thumbnail.png" "--seccomp" "5" "/usr/bin/gdk-pixbuf-thumbnailer" "-s" "256" "file:///tmp/gnome-desktop-file-to-thumbnail.png" "/tmp/gnome-desktop-thumbnailer.png"
bwrap: Creating new namespace failed, likely because the kernel does not support user namespaces. bwrap must be installed setuid on such systems.
stat("/sys/module/user_namespace/parameters/enable", 0x7ffee7d684b0) = -1 ENOENT (No such file or directory)
bwrap --unshare-all bash
hele.. a co dělá ten unshare-all? teď jsem zjistil, že existuje unshare-pid, unshare-net… nemusím mít kvůli tomu víc těch namespaces v kernelu?
zapnul jsem namespace pro PID, UTS, IPC a jede to !!! :)