1 #define PETSC_DESIRE_FEATURE_TEST_MACROS /* for realpath() */ 2 #include <petscsys.h> 3 #if defined(PETSC_HAVE_PWD_H) 4 #include <pwd.h> 5 #endif 6 #include <ctype.h> 7 #include <sys/stat.h> 8 #if defined(PETSC_HAVE_UNISTD_H) 9 #include <unistd.h> 10 #endif 11 #if defined(PETSC_HAVE_SYS_UTSNAME_H) 12 #include <sys/utsname.h> 13 #endif 14 #if defined(PETSC_HAVE_SYS_SYSTEMINFO_H) 15 #include <sys/systeminfo.h> 16 #endif 17 18 /*@C 19 PetscGetRealPath - Get the path without symbolic links etc. and in absolute form. 20 21 Not Collective 22 23 Input Parameter: 24 . path - path to resolve 25 26 Output Parameter: 27 . rpath - resolved path 28 29 Level: developer 30 31 Notes: 32 rpath is assumed to be of length `PETSC_MAX_PATH_LEN`. 33 34 Systems that use the automounter often generate absolute paths 35 of the form "/tmp_mnt....". However, the automounter will fail to 36 mount this path if it is not already mounted, so we remove this from 37 the head of the line. This may cause problems if, for some reason, 38 /tmp_mnt is valid and not the result of the automounter. 39 40 .seealso: `PetscGetFullPath()` 41 @*/ 42 PetscErrorCode PetscGetRealPath(const char path[], char rpath[]) 43 { 44 char tmp3[PETSC_MAX_PATH_LEN]; 45 PetscBool flg; 46 #if !defined(PETSC_HAVE_REALPATH) && defined(PETSC_HAVE_READLINK) 47 char tmp1[PETSC_MAX_PATH_LEN], tmp4[PETSC_MAX_PATH_LEN], *tmp2; 48 size_t N, len, len1, len2; 49 int n, m; 50 #endif 51 52 PetscFunctionBegin; 53 #if defined(PETSC_HAVE_REALPATH) 54 PetscCheck(realpath(path, rpath), PETSC_COMM_SELF, PETSC_ERR_LIB, "realpath()"); 55 #elif defined(PETSC_HAVE_READLINK) 56 /* Algorithm: we move through the path, replacing links with the real paths. */ 57 PetscCall(PetscStrcpy(rpath, path)); 58 PetscCall(PetscStrlen(rpath, &N)); 59 while (N) { 60 PetscCall(PetscStrncpy(tmp1, rpath, N)); 61 tmp1[N] = 0; 62 n = readlink(tmp1, tmp3, PETSC_MAX_PATH_LEN); 63 if (n > 0) { 64 tmp3[n] = 0; /* readlink does not automatically add 0 to string end */ 65 if (tmp3[0] != '/') { 66 PetscCall(PetscStrchr(tmp1, '/', &tmp2)); 67 PetscCall(PetscStrlen(tmp1, &len1)); 68 PetscCall(PetscStrlen(tmp2, &len2)); 69 m = len1 - len2; 70 PetscCall(PetscStrncpy(tmp4, tmp1, m)); 71 tmp4[m] = 0; 72 PetscCall(PetscStrlen(tmp4, &len)); 73 PetscCall(PetscStrlcat(tmp4, "/", PETSC_MAX_PATH_LEN)); 74 PetscCall(PetscStrlcat(tmp4, tmp3, PETSC_MAX_PATH_LEN)); 75 PetscCall(PetscGetRealPath(tmp4, rpath)); 76 PetscCall(PetscStrlcat(rpath, path + N, PETSC_MAX_PATH_LEN)); 77 } else { 78 PetscCall(PetscGetRealPath(tmp3, tmp1)); 79 PetscCall(PetscStrncpy(rpath, tmp1, PETSC_MAX_PATH_LEN)); 80 PetscCall(PetscStrlcat(rpath, path + N, PETSC_MAX_PATH_LEN)); 81 } 82 PetscFunctionReturn(PETSC_SUCCESS); 83 } 84 PetscCall(PetscStrchr(tmp1, '/', &tmp2)); 85 if (tmp2) { 86 PetscCall(PetscStrlen(tmp1, &len1)); 87 PetscCall(PetscStrlen(tmp2, &len2)); 88 N = len1 - len2; 89 } else { 90 PetscCall(PetscStrlen(tmp1, &N)); 91 } 92 } 93 PetscCall(PetscStrncpy(rpath, path, PETSC_MAX_PATH_LEN)); 94 #else /* Just punt */ 95 PetscCall(PetscStrcpy(rpath, path)); 96 #endif 97 98 /* remove garbage some automounters put at the beginning of the path */ 99 PetscCall(PetscStrncmp("/tmp_mnt/", rpath, 9, &flg)); 100 if (flg) { 101 PetscCall(PetscStrcpy(tmp3, rpath + 8)); 102 PetscCall(PetscStrcpy(rpath, tmp3)); 103 } 104 PetscFunctionReturn(PETSC_SUCCESS); 105 } 106