[pacman-dev] [PATCH v4 5/5] be_package: Build the file list from MTREE if possible
Florian Pritz
bluewind at xinu.at
Sat Feb 1 13:12:23 EST 2014
This greatly speeds up file list generation times by avoiding
uncompressing the whole package.
pacman -S base with a deliberate file conflict:
before: 9.1 seconds
after: 2.2 seconds
Signed-off-by: Florian Pritz <bluewind at xinu.at>
---
v4:
- fix mem leak when cleaning up pkg->files
- make mtree_*size names a little more descriptive
- switch comments to c style
- break some long lines, there are still a few left..
- files starting with . are handled by handle_simple_path now
- pass the path directly to add_entry_to_files_list
- consolidate early breaking in main loop
NOT changed:
- ret for archive_read_next_header: copied from original code in
_alpm_pkg_load_internal, if anyone cares feel free to change it later
- I didn't break all lines > 80 chars, that should probably be done in a
line break cleanup only commit
lib/libalpm/be_package.c | 150 +++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 146 insertions(+), 4 deletions(-)
diff --git a/lib/libalpm/be_package.c b/lib/libalpm/be_package.c
index 393f436..ac52ae1 100644
--- a/lib/libalpm/be_package.c
+++ b/lib/libalpm/be_package.c
@@ -386,13 +386,36 @@ static int add_entry_to_files_list(alpm_pkg_t *pkg, size_t *files_size,
{
const size_t files_count = pkg->files.count;
alpm_file_t *current_file;
+ mode_t type;
+ size_t pathlen;
if(!_alpm_realloc((void **)&pkg->files.files, files_size, (files_count + 1) * sizeof(alpm_file_t))) {
return -1;
}
+ type = archive_entry_filetype(entry);
+
+ pathlen = strlen(path);
+
current_file = pkg->files.files + files_count;
- STRDUP(current_file->name, path, return -1);
+
+ /* mtree paths don't contain a tailing slash, those we get from
+ * the archive directly do (expensive way)
+ * Other code relies on it to detect directories so add it here.*/
+ if(type == AE_IFDIR && path[pathlen - 1] != '/') {
+ /* 2 = 1 for / + 1 for \0 */
+ char *newpath = malloc(pathlen + 2);
+ if (!newpath) {
+ _alpm_alloc_fail(pathlen + 2);
+ return -1;
+ }
+ strcpy(newpath, path);
+ newpath[pathlen] = '/';
+ newpath[pathlen + 1] = '\0';
+ current_file->name = newpath;
+ } else {
+ STRDUP(current_file->name, path, return -1);
+ }
current_file->size = archive_entry_size(entry);
current_file->mode = archive_entry_mode(entry);
pkg->files.count++;
@@ -400,6 +423,115 @@ static int add_entry_to_files_list(alpm_pkg_t *pkg, size_t *files_size,
}
/**
+ * Generate a new file list from an mtree file and add it to the package.
+ * An existing file list will be free()d first.
+ *
+ * archive should point to an archive struct which is already at the
+ * position of the mtree's header.
+ *
+ * @param handle
+ * @param pkg package to add the file list to
+ * @param archive archive containing the mtree
+ * @return 0 on success, <0 on error
+ */
+static int build_filelist_from_mtree(alpm_handle_t *handle, alpm_pkg_t *pkg, struct archive *archive)
+{
+ int ret = 0;
+ size_t mtree_maxsize = 0;
+ size_t mtree_cursize = 0;
+ size_t files_size = 0; /* we clean up the existing array so this is fine */
+ char *mtree_data = NULL;
+ struct archive *mtree;
+ struct archive_entry *mtree_entry = NULL;
+
+ _alpm_log(handle, ALPM_LOG_DEBUG,
+ "found mtree for package %s, getting file list\n", pkg->filename);
+
+ /* throw away any files we might have already found */
+ for (size_t i = 0; i < pkg->files.count; i++) {
+ free(pkg->files.files[i].name);
+ }
+ free(pkg->files.files);
+ pkg->files.files = NULL;
+ pkg->files.count = 0;
+
+ /* create a new archive to parse the mtree and load it from archive into memory */
+ /* TODO: split this into a function */
+ if((mtree = archive_read_new()) == NULL) {
+ handle->pm_errno = ALPM_ERR_LIBARCHIVE;
+ goto error;
+ }
+
+ _alpm_archive_read_support_filter_all(mtree);
+ archive_read_support_format_mtree(mtree);
+
+ /* TODO: split this into a function */
+ while(1) {
+ ssize_t size;
+
+ if(!_alpm_realloc((void **)&mtree_data, &mtree_maxsize, mtree_cursize + ALPM_BUFFER_SIZE)) {
+ goto error;
+ }
+
+ size = archive_read_data(archive, mtree_data + mtree_cursize, ALPM_BUFFER_SIZE);
+
+ if(size < 0) {
+ _alpm_log(handle, ALPM_LOG_ERROR, _("error while reading package %s: %s\n"),
+ pkg->filename, archive_error_string(archive));
+ handle->pm_errno = ALPM_ERR_LIBARCHIVE;
+ goto error;
+ }
+ if(size == 0) {
+ break;
+ }
+
+ mtree_cursize += size;
+ }
+
+ /* TODO: need wrapper function for archive_read_open_memory for old libarchive versions? */
+ if(archive_read_open_memory(mtree, mtree_data, mtree_cursize)) {
+ _alpm_log(handle, ALPM_LOG_ERROR,
+ _("error while reading mtree of package %s: %s\n"),
+ pkg->filename, archive_error_string(mtree));
+ handle->pm_errno = ALPM_ERR_LIBARCHIVE;
+ goto error;
+ }
+
+ while((ret = archive_read_next_header(mtree, &mtree_entry)) == ARCHIVE_OK) {
+ const char *path = archive_entry_pathname(mtree_entry);
+
+ /* strip leading "./" from path entries */
+ if(path[0] == '.' && path[1] == '/') {
+ path += 2;
+ }
+
+ if(handle_simple_path(pkg, path)) {
+ continue;
+ }
+
+ if(add_entry_to_files_list(pkg, &files_size, mtree_entry, path) < 0) {
+ goto error;
+ }
+ }
+
+ if(ret != ARCHIVE_EOF && ret != ARCHIVE_OK) { /* An error occurred */
+ _alpm_log(handle, ALPM_LOG_ERROR, _("error while reading mtree of package %s: %s\n"),
+ pkg->filename, archive_error_string(mtree));
+ handle->pm_errno = ALPM_ERR_LIBARCHIVE;
+ goto error;
+ }
+
+ free(mtree_data);
+ _alpm_archive_read_free(mtree);
+ _alpm_log(handle, ALPM_LOG_DEBUG, "finished mtree reading for %s\n", pkg->filename);
+ return 0;
+error:
+ free(mtree_data);
+ _alpm_archive_read_free(mtree);
+ return -1;
+}
+
+/**
* Load a package and create the corresponding alpm_pkg_t struct.
* @param handle the context handle
* @param pkgfile path to the package file
@@ -409,7 +541,7 @@ static int add_entry_to_files_list(alpm_pkg_t *pkg, size_t *files_size,
alpm_pkg_t *_alpm_pkg_load_internal(alpm_handle_t *handle,
const char *pkgfile, int full)
{
- int ret, fd, config = 0;
+ int ret, fd, config, hit_mtree = 0;
struct archive *archive;
struct archive_entry *entry;
alpm_pkg_t *newpkg;
@@ -472,7 +604,17 @@ alpm_pkg_t *_alpm_pkg_load_internal(alpm_handle_t *handle,
continue;
} else if(handle_simple_path(newpkg, entry_name)) {
continue;
- } else if(full) {
+ } else if(full && strcmp(entry_name, ".MTREE") == 0) {
+ /* building the file list: cheap way
+ * get the filelist from the mtree file rather than scanning
+ * the whole archive */
+ if(build_filelist_from_mtree(handle, newpkg, archive) < 0) {
+ goto error;
+ }
+ hit_mtree = 1;
+ continue;
+ } else if(full && !hit_mtree) {
+ /* building the file list: expensive way */
if(add_entry_to_files_list(newpkg, &files_size, entry, entry_name) < 0) {
goto error;
}
@@ -486,7 +628,7 @@ alpm_pkg_t *_alpm_pkg_load_internal(alpm_handle_t *handle,
}
/* if we are not doing a full read, see if we have all we need */
- if(!full && config) {
+ if((!full || hit_mtree) && config) {
break;
}
}
--
1.8.5.3
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