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Allow creating empty filesystem images

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Support creating empty filesystem images by making the source directory
argument optional.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>
This commit is contained in:
Jo-Philipp Wich 2016-08-14 21:55:40 +02:00
parent 3af931b0b6
commit 484903e433
1 changed files with 30 additions and 9 deletions
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39
make_ext4fs.c
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@ -45,6 +45,27 @@ static int filter_dot(const struct dirent *d)
return (strcmp(d->d_name, "..") && strcmp(d->d_name, ".")); return (strcmp(d->d_name, "..") && strcmp(d->d_name, "."));
} }
static u32 build_default_directory_structure(time_t fixed_time)
{
u32 inode;
u32 root_inode;
struct dentry dentries = {
.filename = "lost+found",
.file_type = EXT4_FT_DIR,
.mode = S_IRWXU,
.uid = 0,
.gid = 0,
.mtime = (fixed_time != -1) ? fixed_time : 0,
};
root_inode = make_directory(0, 1, &dentries, 1);
inode = make_directory(root_inode, 0, NULL, 0);
*dentries.inode = inode;
inode_set_permissions(inode, dentries.mode,
dentries.uid, dentries.gid, dentries.mtime);
return root_inode;
}
/* Read a local directory and create the same tree in the generated filesystem. /* Read a local directory and create the same tree in the generated filesystem.
Calls itself recursively with each directory in the given directory. Calls itself recursively with each directory in the given directory.
full_path is an absolute or relative path, with a trailing slash, to the full_path is an absolute or relative path, with a trailing slash, to the
@ -367,12 +388,8 @@ int make_ext4fs_internal(int fd, const char *_directory,
if (setjmp(setjmp_env)) if (setjmp(setjmp_env))
return EXIT_FAILURE; /* Handle a call to longjmp() */ return EXIT_FAILURE; /* Handle a call to longjmp() */
if (_directory == NULL) { if (_directory)
fprintf(stderr, "Need a source directory\n"); directory = canonicalize_rel_slashes(_directory);
return EXIT_FAILURE;
}
directory = canonicalize_rel_slashes(_directory);
if (info.len <= 0) if (info.len <= 0)
info.len = get_file_size(fd); info.len = get_file_size(fd);
@ -457,11 +474,15 @@ int make_ext4fs_internal(int fd, const char *_directory,
if (info.feat_compat & EXT4_FEATURE_COMPAT_RESIZE_INODE) if (info.feat_compat & EXT4_FEATURE_COMPAT_RESIZE_INODE)
ext4_create_resize_inode(); ext4_create_resize_inode();
root_inode_num = build_directory_structure(directory, "", 0, if (directory)
fs_config_func, verbose, fixed_time); root_inode_num = build_directory_structure(directory, "", 0,
fs_config_func, verbose, fixed_time);
else
root_inode_num = build_default_directory_structure(fixed_time);
root_mode = S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH; root_mode = S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
inode_set_permissions(root_inode_num, root_mode, 0, 0, 0); inode_set_permissions(root_inode_num, root_mode, 0, 0,
(fixed_time != 1) ? fixed_time : 0);
ext4_update_free(); ext4_update_free();