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author | Richard W.M. Jones <rjones@redhat.com> | 2012-08-17 14:11:21 +0100 |
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committer | Richard W.M. Jones <rjones@redhat.com> | 2012-08-17 16:08:13 +0100 |
commit | a69f44f56f20beab7793be428df22104f79500e7 (patch) | |
tree | 76d6d082290fbc7b429b7be8c7781881249f51f0 /src/file.c | |
parent | 1b4d8e2cca7819b4c6e14bb052f40a9fc40205d3 (diff) | |
download | libguestfs-a69f44f56f20beab7793be428df22104f79500e7.tar.gz libguestfs-a69f44f56f20beab7793be428df22104f79500e7.tar.xz libguestfs-a69f44f56f20beab7793be428df22104f79500e7.zip |
guestfs_ls: Reimplement to avoid protocol limits.
Diffstat (limited to 'src/file.c')
-rw-r--r-- | src/file.c | 102 |
1 files changed, 102 insertions, 0 deletions
@@ -535,3 +535,105 @@ guestfs__readlinklist (guestfs_h *g, const char *dir, char *const *names) return ret; } + +char ** +guestfs__ls (guestfs_h *g, const char *directory) +{ + int fd = -1; + struct stat statbuf; + char *tmpfile = NULL, *buf = NULL; + char **ret = NULL; + size_t i, count, size; + + tmpfile = safe_asprintf (g, "%s/ls%d", g->tmpdir, ++g->unique); + + if (guestfs_ls0 (g, directory, tmpfile) == -1) + goto err; + + fd = open (tmpfile, O_RDONLY|O_CLOEXEC); + if (fd == -1) { + perrorf (g, "open: %s", tmpfile); + goto err; + } + + unlink (tmpfile); + free (tmpfile); + tmpfile = NULL; + + /* Read the whole file into memory. */ + if (fstat (fd, &statbuf) == -1) { + perrorf (g, "stat: %s", tmpfile); + goto err; + } + + /* Don't use safe_malloc, because we want to return an errno to the caller. */ + size = statbuf.st_size; + buf = malloc (size); + if (!buf) { + perrorf (g, "malloc: %zu bytes", size); + goto err; + } + + if (full_read (fd, buf, size) != size) { + perrorf (g, "full-read: %s: %zu bytes", tmpfile, size); + goto err; + } + + if (close (fd) == -1) { + perrorf (g, "close: %s", tmpfile); + goto err; + } + fd = -1; + + /* 'buf' contains the list of strings, separated (and terminated) by + * '\0' characters. Convert this to a list of lines. Note we + * handle the case where buf is completely empty (size == 0). + */ + count = 0; + for (i = 0; i < size; ++i) + if (buf[i] == '\0') + count++; + + ret = malloc ((count + 1) * sizeof (char *)); + if (!ret) { + perrorf (g, "malloc"); + goto err; + } + + count = 0; + ret[count++] = buf; + for (i = 0; i < size; ++i) { + if (buf[i] == '\0') + ret[count++] = &buf[i+1]; + } + ret[--count] = NULL; + + /* Finally we have to duplicate and sort the strings, since that's + * what the caller is expecting. + */ + for (i = 0; ret[i] != NULL; ++i) { + ret[i] = strdup (ret[i]); + if (ret[i] == NULL) { + perrorf (g, "strdup"); + while (i > 0) + free (ret[--i]); + goto err; + } + } + free (buf); + + sort_strings (ret, count); + + return ret; /* caller frees */ + + err: + free (buf); + free (ret); + if (fd >= 0) + close (fd); + if (tmpfile) { + unlink (tmpfile); + free (tmpfile); + } + return NULL; +} |