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[syslinux] fix tails breakage and add support for fine grained versions

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* With that obscene an amount of pre-releases of 6.03 (seriously, how
  many more YEARS pre-release of the same version do you actually need?),
  of course the syslinux people have managed to break the last remnants
  of compatibility they had between a single major version, so we are now
  forced to provide a smorgasbord of pre-release and out of band syslinux
  binaries on our server, and make sure we detect and handle incompatible
  syslinux versions clientside...
  For instance, even after fixing the EFI vs isolinux issue, we find
  that tails 1.1 is incompatible with 'pre19'. But it also uses its own
  '20131220' extended identifier, instead of 'pre1', its closest
  relative. So we have to multiply files and symbolic links to try to
  keep everybody happy.
  Talk about a MAJOR LETDOWN from the syslinux project...
* Closes #363
This commit is contained in:
Pete Batard 2014-08-06 00:57:32 +01:00
parent 60c66ef813
commit 0fceb38433
7 changed files with 167 additions and 75 deletions
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57
src/syslinux.c
View file

@ -109,7 +109,8 @@ BOOL InstallSyslinux(DWORD drive_index, char drive_letter)
syslinux_ldlinux[i] = (unsigned char*) malloc(syslinux_ldlinux_len[i]);
if (syslinux_ldlinux[i] == NULL)
goto out;
static_sprintf(path, "%s/%s-%s/%s.%s", FILES_DIR, syslinux, iso_report.sl_version_str, ldlinux, i==0?"sys":"bss");
static_sprintf(path, "%s/%s-%s%s/%s.%s", FILES_DIR, syslinux, iso_report.sl_version_str,
iso_report.sl_version_ext, ldlinux, i==0?"sys":"bss");
fd = fopen(path, "rb");
if (fd == NULL) {
uprintf("Could not open %s\n", path);
@ -300,3 +301,57 @@ out:
safe_closehandle(f_handle);
return r;
}
uint16_t GetSyslinuxVersion(char* buf, size_t buf_size, char** ext)
{
size_t i, j;
char *p;
uint16_t version;
const char LINUX[] = { 'L', 'I', 'N', 'U', 'X', ' ' };
static char* nullstr = "";
*ext = nullstr;
if (buf_size < 256)
return 0;
// Start at 64 to avoid the short incomplete version at the beginning of ldlinux.sys
for (i=64; i<buf_size-64; i++) {
if (memcmp(&buf[i], LINUX, sizeof(LINUX)) == 0) {
// Check for ISO or SYS prefix
if (!( ((buf[i-3] == 'I') && (buf[i-2] == 'S') && (buf[i-1] == 'O'))
|| ((buf[i-3] == 'S') && (buf[i-2] == 'Y') && (buf[i-1] == 'S')) ))
continue;
i += sizeof(LINUX);
version = (((uint8_t)strtoul(&buf[i], &p, 10))<<8) + (uint8_t)strtoul(&p[1], &p, 10);
if (version == 0)
continue;
p[safe_strlen(p)] = 0;
// Ensure that our extra version string starts with a slash
*p = '/';
// Remove the x.yz- duplicate if present
for (j=0; (buf[i+j] == p[1+j]) && (buf[i+j] != ' '); j++);
if (p[j+1] == '-')
j++;
if (j >= 4) {
p[j] = '/';
p = &p[j];
}
for (j=safe_strlen(p)-1; j>0; j--) {
// Arch Linux affixes a star for their version - who knows what else is out there...
if ((p[j] == ' ') || (p[j] == '*'))
p[j] = 0;
else
break;
}
// Sanitize the string
for (j=1; j<safe_strlen(p); j++)
// Some people are bound to have slashes in their date strings
if ((p[j] == '/') || (p[j] == '\\') || (p[j] == '*'))
p[j] = '_';
// If all we have is a slash, return the empty string for the extra version
*ext = (p[1] == 0)?nullstr:p;
return version;
}
}
return 0;
}