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Several improvements

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This commit is contained in:
topjohnwu
2017-07-02 23:04:57 +08:00
parent bf42fce17e
commit 7eed9c4a6d
6 changed files with 104 additions and 91 deletions
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161
jni/utils/img.c
View File

@@ -10,80 +10,22 @@
#include "magisk.h"
#include "utils.h"
int create_img(const char *img, int size) {
unlink(img);
LOGI("Create %s with size %dM\n", img, size);
// Create a temp file with the file contexts
char file_contexts[] = "/magisk(/.*)? u:object_r:system_file:s0\n";
// If not root, attempt to create in current diretory
char *filename = getuid() == UID_ROOT ? "/dev/file_contexts_image" : "file_contexts_image";
int fd = xopen(filename, O_WRONLY | O_CREAT | O_TRUNC, 0644);
xwrite(fd, file_contexts, sizeof(file_contexts));
close(fd);
char buffer[PATH_MAX];
snprintf(buffer, sizeof(buffer),
"make_ext4fs -l %dM -a /magisk -S %s %s; e2fsck -yf %s;", size, filename, img, img);
char *const command[] = { "sh", "-c", buffer, NULL };
int pid, status;
pid = run_command(0, NULL, "/system/bin/sh", command);
if (pid == -1)
return 1;
waitpid(pid, &status, 0);
unlink(filename);
return WEXITSTATUS(status);
}
int get_img_size(const char *img, int *used, int *total) {
if (access(img, R_OK) == -1)
return 1;
char buffer[PATH_MAX];
snprintf(buffer, sizeof(buffer), "e2fsck -n %s", img);
char *const command[] = { "sh", "-c", buffer, NULL };
int pid, fd = 0, status = 1;
pid = run_command(1, &fd, "/system/bin/sh", command);
if (pid == -1)
return 1;
while (fdgets(buffer, sizeof(buffer), fd)) {
// LOGD("magisk_img: %s", buffer);
if (strstr(buffer, img)) {
char *tok = strtok(buffer, ",");
while(tok != NULL) {
if (strstr(tok, "blocks")) {
status = 0;
break;
}
tok = strtok(NULL, ",");
}
if (status) continue;
sscanf(tok, "%d/%d", used, total);
*used = *used / 256 + 1;
*total /= 256;
break;
}
}
close(fd);
waitpid(pid, &status, 0);
return WEXITSTATUS(status);
}
int resize_img(const char *img, int size) {
LOGI("Resize %s to %dM\n", img, size);
char buffer[PATH_MAX];
snprintf(buffer, sizeof(buffer), "e2fsck -yf %s; resize2fs %s %dM;", img, img, size);
char *const command[] = { "sh", "-c", buffer, NULL };
int pid, status, fd = 0;
pid = run_command(1, &fd, "/system/bin/sh", command);
if (pid == -1)
static int e2fsck(const char *img) {
// Check and repair ext4 image
char buffer[128];
int pid, fd = 0;
char *const command[] = { "e2fsck", "-yf", (char *) img, NULL };
pid = run_command(1, &fd, "/system/bin/e2fsck", command);
if (pid < 0)
return 1;
while (fdgets(buffer, sizeof(buffer), fd))
LOGD("magisk_img: %s", buffer);
waitpid(pid, NULL, 0);
close(fd);
waitpid(pid, &status, 0);
return WEXITSTATUS(status);
return 0;
}
char *loopsetup(const char *img) {
static char *loopsetup(const char *img) {
char device[20];
struct loop_info64 info;
int i, lfd, ffd;
@@ -107,6 +49,77 @@ char *loopsetup(const char *img) {
return strdup(device);
}
int create_img(const char *img, int size) {
unlink(img);
LOGI("Create %s with size %dM\n", img, size);
// Create a temp file with the file contexts
char file_contexts[] = "/magisk(/.*)? u:object_r:system_file:s0\n";
// If not root, attempt to create in current diretory
char *filename = getuid() == UID_ROOT ? "/dev/file_contexts_image" : "file_contexts_image";
int pid, status, fd = xopen(filename, O_WRONLY | O_CREAT | O_TRUNC, 0644);
xwrite(fd, file_contexts, sizeof(file_contexts));
close(fd);
char buffer[16];
snprintf(buffer, sizeof(buffer), "%dM", size);
char *const command[] = { "make_ext4fs", "-l", buffer, "-a", "/magisk", "-S", filename, (char *) img, NULL };
pid = run_command(0, NULL, "/system/bin/make_ext4fs", command);
if (pid < 0)
return 1;
waitpid(pid, &status, 0);
unlink(filename);
return WEXITSTATUS(status);
}
int get_img_size(const char *img, int *used, int *total) {
if (access(img, R_OK) == -1)
return 1;
char buffer[PATH_MAX];
int pid, fd = 0, status = 1;
char *const command[] = { "e2fsck", "-n", (char *) img, NULL };
pid = run_command(1, &fd, "/system/bin/e2fsck", command);
if (pid < 0)
return 1;
while (fdgets(buffer, sizeof(buffer), fd)) {
if (strstr(buffer, img)) {
char *tok = strtok(buffer, ",");
while(tok != NULL) {
if (strstr(tok, "blocks")) {
status = 0;
break;
}
tok = strtok(NULL, ",");
}
if (status) continue;
sscanf(tok, "%d/%d", used, total);
*used = *used / 256 + 1;
*total /= 256;
break;
}
}
close(fd);
waitpid(pid, NULL, 0);
return 0;
}
int resize_img(const char *img, int size) {
LOGI("Resize %s to %dM\n", img, size);
if (e2fsck(img))
return 1;
char buffer[128];
int pid, status, fd = 0;
snprintf(buffer, sizeof(buffer), "%dM", size);
char *const command[] = { "resize2fs", (char *) img, buffer, NULL };
pid = run_command(1, &fd, "/system/bin/resize2fs", command);
if (pid < 0)
return 1;
while (fdgets(buffer, sizeof(buffer), fd))
LOGD("magisk_img: %s", buffer);
close(fd);
waitpid(pid, &status, 0);
return WEXITSTATUS(status);
}
char *mount_image(const char *img, const char *target) {
if (access(img, F_OK) == -1)
return NULL;
@@ -117,16 +130,10 @@ char *mount_image(const char *img, const char *target) {
xmount(NULL, "/", NULL, MS_REMOUNT | MS_RDONLY, NULL);
}
}
// Check and repair ext4 image
char buffer[PATH_MAX];
snprintf(buffer, sizeof(buffer), "e2fsck -yf %s", img);
int fd = 0;
char *const command[] = { "sh", "-c", buffer, NULL };
if (run_command(1, &fd, "/system/bin/sh", command) == -1)
if (e2fsck(img))
return NULL;
while (fdgets(buffer, sizeof(buffer), fd))
LOGD("magisk_img: %s", buffer);
close(fd);
char *device = loopsetup(img);
if (device)
xmount(device, target, "ext4", 0, NULL);

9
jni/utils/misc.c
View File

@@ -225,10 +225,12 @@ void setup_sighandlers(void (*handler)(int)) {
*fd != 0 -> STDOUT (or STDERR) will be redirected to *fd
*/
int run_command(int err, int *fd, const char *path, char *const argv[]) {
int pipefd[2], writeEnd = 0;
int pipefd[2], writeEnd = -1;
if (fd) {
if (*fd == 0) {
if (*fd) {
writeEnd = *fd;
} else {
if (pipe(pipefd) == -1)
return -1;
writeEnd = pipefd[1];
@@ -239,12 +241,11 @@ int run_command(int err, int *fd, const char *path, char *const argv[]) {
int pid = fork();
if (pid != 0) {
if (writeEnd) close(writeEnd);
close(writeEnd);
return pid;
}
if (fd) {
if (writeEnd == 0) writeEnd = *fd;
xdup2(writeEnd, STDOUT_FILENO);
if (err) xdup2(writeEnd, STDERR_FILENO);
}

1
jni/utils/utils.h
View File

@@ -98,7 +98,6 @@ int switch_mnt_ns(int pid);
int create_img(const char *img, int size);
int get_img_size(const char *img, int *used, int *total);
int resize_img(const char *img, int size);
char *loopsetup(const char *img);
char *mount_image(const char *img, const char *target);
void umount_image(const char *target, const char *device);