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Sources/fstools/libfstools/common.c

  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 
  3 #include "common.h"
  4 #define BUFLEN 128
  5 
  6 int
  7 read_uint_from_file(char *dirname, char *filename, unsigned int *i)
  8 {
  9         FILE *f;
 10         char fname[BUFLEN];
 11         int ret = -1;
 12 
 13         snprintf(fname, sizeof(fname), "%s/%s", dirname, filename);
 14 
 15         f = fopen(fname, "r");
 16         if (!f)
 17                 return ret;
 18 
 19         if (fscanf(f, "%u", i) == 1)
 20                 ret = 0;
 21 
 22         fclose(f);
 23         return ret;
 24 }
 25 
 26 char
 27 *read_string_from_file(const char *dirname, const char *filename, char *buf, size_t bufsz)
 28 {
 29         FILE *f;
 30         char fname[BUFLEN];
 31         int i;
 32 
 33         snprintf(fname, sizeof(fname), "%s/%s", dirname, filename);
 34 
 35         f = fopen(fname, "r");
 36         if (!f)
 37                 return NULL;
 38 
 39         if (fgets(buf, bufsz, f) == NULL) {
 40                 fclose(f);
 41                 return NULL;
 42         }
 43 
 44         fclose(f);
 45 
 46         /* make sure the string is \0 terminated */
 47         buf[bufsz - 1] = '\0';
 48 
 49         /* remove trailing whitespace */
 50         i = strlen(buf) - 1;
 51         while (i > 0 && buf[i] <= ' ')
 52                 buf[i--] = '\0';
 53 
 54         return buf;
 55 }
 56 
 57 int block_file_identify(FILE *f, uint64_t offset)
 58 {
 59         uint32_t magic = 0;
 60         size_t n;
 61 
 62         if (fseeko(f, offset, SEEK_SET) < 0)
 63                 return -1;
 64 
 65         n = fread(&magic, sizeof(magic), 1, f);
 66         if (magic == cpu_to_le32(0x88b1f)) {
 67                 return FS_TARGZ;
 68         }
 69 
 70         if (fseeko(f, offset + 0x400, SEEK_SET) < 0)
 71                 return -1;
 72 
 73         n = fread(&magic, sizeof(magic), 1, f);
 74         if (n != 1)
 75                 return -1;
 76 
 77         if (magic == cpu_to_le32(0xF2F52010))
 78                 return FS_F2FS;
 79 
 80         magic = 0;
 81         if (fseeko(f, offset + 0x438, SEEK_SET) < 0)
 82                 return -1;
 83 
 84         n = fread(&magic, sizeof(magic), 1, f);
 85         if (n != 1)
 86                 return -1;
 87 
 88         if ((le32_to_cpu(magic) & 0xffff) == 0xef53)
 89                 return FS_EXT4;
 90 
 91         return FS_NONE;
 92 }
 93 
 94 static bool use_f2fs(struct volume *v, uint64_t offset, const char *bdev)
 95 {
 96         uint64_t size = 0;
 97         bool ret = false;
 98         int fd;
 99 
100         fd = open(bdev, O_RDONLY);
101         if (fd < 0)
102                 return false;
103 
104         if (ioctl(fd, BLKGETSIZE64, &size) == 0)
105                 ret = size - offset > F2FS_MINSIZE;
106 
107         close(fd);
108 
109         return ret;
110 }
111 
112 int block_volume_format(struct volume *v, uint64_t offset, const char *bdev)
113 {
114         int ret = 0;
115         char str[128];
116 
117         switch (volume_identify(v)) {
118         case FS_TARGZ:
119                 snprintf(str, sizeof(str), "gzip -cd %s > /tmp/sysupgrade.tar", v->blk);
120                 system(str);
121                 /* fall-through */
122         case FS_NONE:
123                 ULOG_INFO("overlay filesystem in %s has not been formatted yet\n", v->blk);
124                 if (use_f2fs(v, offset, bdev))
125                         snprintf(str, sizeof(str), "mkfs.f2fs -q -l rootfs_data %s", v->blk);
126                 else
127                         snprintf(str, sizeof(str), "mkfs.ext4 -q -L rootfs_data %s", v->blk);
128 
129                 ret = system(str);
130                 break;
131         default:
132                 break;
133         }
134 
135         return ret;
136 }
137 

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