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Go Back   Linux Archive > ArchLinux > ArchLinux Pacman Development

 
 
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Old 08-07-2012, 02:18 AM
Andrew Gregory
 
Default _alpm_filelist_resolve: add useful return code

Return -1 if a path is too long to resolve or we run out of memory.

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
---
lib/libalpm/filelist.c | 81 ++++++++++++++++++++++++++++----------------------
lib/libalpm/filelist.h | 4 +--
2 files changed, 47 insertions(+), 38 deletions(-)

diff --git a/lib/libalpm/filelist.c b/lib/libalpm/filelist.c
index 58b1971..bf390ab 100644
--- a/lib/libalpm/filelist.c
+++ b/lib/libalpm/filelist.c
@@ -31,21 +31,25 @@ static int _alpm_filelist_strcmp(const void *s1, const void *s2)
return strcmp(*(char **)s1, *(char **)s2);
}

+/* TODO make sure callers check the return value so we can bail on errors.
+ * For now we soldier on as best we can, skipping paths that are too long to
+ * resolve and using the original filenames on memory errors. */
/**
* @brief Resolves a symlink and its children.
*
* @attention Pre-condition: files must be sorted!
*
* @param files filelist to resolve
- * @param i index in files to start processing
+ * @param i pointer to the index in files to start processing, will point to
+ * the last file processed on return
* @param path absolute path for the symlink being resolved
* @param root_len length of the root portion of path
* @param resolving is file i in files a symlink that needs to be resolved
*
- * @return the index of the last file resolved
+ * @return 0 on success, -1 on error
*/
-size_t _alpm_filelist_resolve_link(
- alpm_filelist_t *files, size_t i, char *path, size_t root_len, int resolving)
+int _alpm_filelist_resolve_link(alpm_filelist_t *files, size_t *i,
+ char *path, size_t root_len, int resolving)
{
char *causal_dir; /* symlink being resolved */
char *filename_r = NULL; /* resolved filename */
@@ -54,29 +58,29 @@ size_t _alpm_filelist_resolve_link(
if(resolving) {
/* deal with the symlink being resolved */
MALLOC(filename_r, PATH_MAX, goto error);
- causal_dir = files->files[i].name;
+ causal_dir = files->files[*i].name;
causal_dir_len = strlen(causal_dir);
if(realpath(path, filename_r) == NULL) {
- files->resolved_path[i] = causal_dir;
+ files->resolved_path[*i] = causal_dir;
FREE(filename_r);
- return i;
+ return -1;
}
causal_dir_r_len = strlen(filename_r + root_len) + 1;
if(causal_dir_r_len >= PATH_MAX) {
- files->resolved_path[i] = causal_dir;
+ files->resolved_path[*i] = causal_dir;
FREE(filename_r);
- return i;
+ return -1;
}
/* remove root_r from filename_r */
memmove(filename_r, filename_r + root_len, causal_dir_r_len);
filename_r[causal_dir_r_len - 1] = '/';
filename_r[causal_dir_r_len] = '';
- STRDUP(files->resolved_path[i], filename_r, goto error);
- i++;
+ STRDUP(files->resolved_path[*i], filename_r, goto error);
+ (*i)++;
}

- for(; i < files->count; i++) {
- char *filename = files->files[i].name;
+ for(; *i < files->count; (*i)++) {
+ char *filename = files->files[*i].name;
size_t filename_len = strlen(filename);
size_t filename_r_len = filename_len;
struct stat sbuf;
@@ -91,7 +95,7 @@ size_t _alpm_filelist_resolve_link(
filename_r_len = filename_len + causal_dir_r_len - causal_dir_len;
if(filename_r_len >= PATH_MAX) {
/* resolved path is too long */
- files->resolved_path[i] = filename;
+ files->resolved_path[*i] = filename;
continue;
}

@@ -101,9 +105,9 @@ size_t _alpm_filelist_resolve_link(
/* deal with files and paths too long to resolve*/
if(filename[filename_len - 1] != '/' || root_len + filename_r_len >= PATH_MAX) {
if(resolving) {
- STRDUP(files->resolved_path[i], filename_r, goto error);
+ STRDUP(files->resolved_path[*i], filename_r, goto error);
} else {
- files->resolved_path[i] = filename;
+ files->resolved_path[*i] = filename;
}
continue;
}
@@ -114,21 +118,21 @@ size_t _alpm_filelist_resolve_link(

/* deal with symlinks */
if(exists && S_ISLNK(sbuf.st_mode)) {
- i = _alpm_filelist_resolve_link(files, i, path, root_len, 1);
+ _alpm_filelist_resolve_link(files, i, path, root_len, 1);
continue;
}

/* deal with normal directories */
if(resolving) {
- STRDUP(files->resolved_path[i], filename_r, goto error);
+ STRDUP(files->resolved_path[*i], filename_r, goto error);
} else {
- files->resolved_path[i] = filename;
+ files->resolved_path[*i] = filename;
}

/* deal with children of non-existent directories to reduce lstat() calls */
if (!exists) {
- for(i++; i < files->count; i++) {
- char *f = files->files[i].name;;
+ for((*i)++; *i < files->count; (*i)++) {
+ char *f = files->files[*i].name;
size_t f_len = strlen(f);
size_t f_r_len;

@@ -140,26 +144,28 @@ size_t _alpm_filelist_resolve_link(
f_r_len = f_len + causal_dir_r_len - causal_dir_len;
if(resolving && f_r_len <= PATH_MAX) {
strcpy(filename_r + causal_dir_r_len, f + causal_dir_len);
- STRDUP(files->resolved_path[i], filename_r, goto error);
+ STRDUP(files->resolved_path[*i], filename_r, goto error);
} else {
- files->resolved_path[i] = f;
+ files->resolved_path[*i] = f;
}
}
- i--;
+ (*i)--;
}
}
+ (*i)--;

FREE(filename_r);

- return i-1;
+ return 0;

error:
FREE(filename_r);
/* out of memory, set remaining files to their original names */
- for(; i < files->count; (i)++) {
- files->resolved_path[i] = files->files[i].name;
+ for(; *i < files->count; (*i)++) {
+ files->resolved_path[*i] = files->files[*i].name;
}
- return i-1;
+ (*i)--;
+ return -1;
}

/**
@@ -173,35 +179,38 @@ error:
*
* @param handle the context handle
* @param files list of files to resolve
+ *
+ * @return 0 on success, -1 on error
*/
-void _alpm_filelist_resolve(alpm_handle_t *handle, alpm_filelist_t *files)
+int _alpm_filelist_resolve(alpm_handle_t *handle, alpm_filelist_t *files)
{
char path[PATH_MAX];
- size_t root_len;
+ size_t root_len, i=0;
+ int ret = 0;

if(!files || files->resolved_path) {
- return;
+ return 0;
}

- CALLOC(files->resolved_path, files->count, sizeof(char *), return);
+ CALLOC(files->resolved_path, files->count, sizeof(char *), return -1);

/* not much point in going on if we can't even resolve root */
if(realpath(handle->root, path) == NULL){
- return;
+ return -1;
}
root_len = strlen(path) + 1;
if(root_len >= PATH_MAX) {
- return;
+ return -1;
}
path[root_len - 1] = '/';
path[root_len] = '';

- _alpm_filelist_resolve_link(files, 0, path, root_len, 0);
+ ret = _alpm_filelist_resolve_link(files, &i, path, root_len, 0);

qsort(files->resolved_path, files->count, sizeof(char *),
_alpm_filelist_strcmp);

- return;
+ return ret;
}


diff --git a/lib/libalpm/filelist.h b/lib/libalpm/filelist.h
index ef865da..8c4f8eb 100644
--- a/lib/libalpm/filelist.h
+++ b/lib/libalpm/filelist.h
@@ -21,9 +21,9 @@

#include "alpm.h"

-size_t _alpm_filelist_resolve_link(alpm_filelist_t *files, size_t i,
+int _alpm_filelist_resolve_link(alpm_filelist_t *files, size_t *i,
char *path, size_t root_len, int resolving);
-void _alpm_filelist_resolve(alpm_handle_t *handle, alpm_filelist_t *files);
+int _alpm_filelist_resolve(alpm_handle_t *handle, alpm_filelist_t *files);

alpm_list_t *_alpm_filelist_difference(alpm_filelist_t *filesA,
alpm_filelist_t *filesB);
--
1.7.11.4
 

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