Refactor pkg_load/parse_descfile into a new backend file

alpm_pkg_load() and parse_descfile() are specific to getting information
from package files, just as other code is specific to getting information
into or out of a package database. Move this code out of package.c, which
should eventually only contain operators on the pmpkg_t struct that do not
depend at all on where the data came from.

Signed-off-by: Dan McGee <dan@archlinux.org>

1 files changed, 283 insertions, 0 deletions

diff --git a/lib/libalpm/be_package.c b/lib/libalpm/be_package.c
new file mode 100644
index 00000000..5b45edf9
--- /dev/null
+++ b/lib/libalpm/be_package.c
@@ -0,0 +1,283 @@
+/*
+ *  be_package.c
+ *
+ *  Copyright (c) 2002-2008 by Judd Vinet <jvinet@zeroflux.org>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+#include <ctype.h>
+#include <locale.h> /* setlocale */
+
+/* libarchive */
+#include <archive.h>
+#include <archive_entry.h>
+
+/* libalpm */
+#include "alpm_list.h"
+#include "util.h"
+#include "log.h"
+#include "error.h"
+#include "package.h"
+#include "deps.h" /* _alpm_splitdep */
+
+/**
+ * Parses the package description file for a package into a pmpkg_t struct.
+ * @param archive the archive to read from, pointed at the .PKGINFO entry
+ * @param newpkg an empty pmpkg_t struct to fill with package info
+ *
+ * @return 0 on success, 1 on error
+ */
+static int parse_descfile(struct archive *a, pmpkg_t *newpkg)
+{
+	char line[PATH_MAX];
+	char *ptr = NULL;
+	char *key = NULL;
+	int linenum = 0;
+
+	ALPM_LOG_FUNC;
+
+	/* loop until we reach EOF (where archive_fgets will return NULL) */
+	while(_alpm_archive_fgets(line, PATH_MAX, a) != NULL) {
+		linenum++;
+		_alpm_strtrim(line);
+		if(strlen(line) == 0 || line[0] == '#') {
+			continue;
+		}
+		ptr = line;
+		key = strsep(&ptr, "=");
+		if(key == NULL || ptr == NULL) {
+			_alpm_log(PM_LOG_DEBUG, "%s: syntax error in description file line %d\n",
+								newpkg->name ? newpkg->name : "error", linenum);
+		} else {
+			key = _alpm_strtrim(key);
+			ptr = _alpm_strtrim(ptr);
+			if(!strcmp(key, "pkgname")) {
+				STRDUP(newpkg->name, ptr, RET_ERR(PM_ERR_MEMORY, -1));
+			} else if(!strcmp(key, "pkgver")) {
+				STRDUP(newpkg->version, ptr, RET_ERR(PM_ERR_MEMORY, -1));
+			} else if(!strcmp(key, "pkgdesc")) {
+				STRDUP(newpkg->desc, ptr, RET_ERR(PM_ERR_MEMORY, -1));
+			} else if(!strcmp(key, "group")) {
+				newpkg->groups = alpm_list_add(newpkg->groups, strdup(ptr));
+			} else if(!strcmp(key, "url")) {
+				STRDUP(newpkg->url, ptr, RET_ERR(PM_ERR_MEMORY, -1));
+			} else if(!strcmp(key, "license")) {
+				newpkg->licenses = alpm_list_add(newpkg->licenses, strdup(ptr));
+			} else if(!strcmp(key, "builddate")) {
+				char first = tolower(ptr[0]);
+				if(first > 'a' && first < 'z') {
+					struct tm tmp_tm = {0}; //initialize to null in case of failure
+					setlocale(LC_TIME, "C");
+					strptime(ptr, "%a %b %e %H:%M:%S %Y", &tmp_tm);
+					newpkg->builddate = mktime(&tmp_tm);
+					setlocale(LC_TIME, "");
+				} else {
+					newpkg->builddate = atol(ptr);
+				}
+			} else if(!strcmp(key, "packager")) {
+				STRDUP(newpkg->packager, ptr, RET_ERR(PM_ERR_MEMORY, -1));
+			} else if(!strcmp(key, "arch")) {
+				STRDUP(newpkg->arch, ptr, RET_ERR(PM_ERR_MEMORY, -1));
+			} else if(!strcmp(key, "size")) {
+				/* size in the raw package is uncompressed (installed) size */
+				newpkg->isize = atol(ptr);
+			} else if(!strcmp(key, "depend")) {
+				pmdepend_t *dep = _alpm_splitdep(ptr);
+				newpkg->depends = alpm_list_add(newpkg->depends, dep);
+			} else if(!strcmp(key, "optdepend")) {
+				newpkg->optdepends = alpm_list_add(newpkg->optdepends, strdup(ptr));
+			} else if(!strcmp(key, "conflict")) {
+				newpkg->conflicts = alpm_list_add(newpkg->conflicts, strdup(ptr));
+			} else if(!strcmp(key, "replaces")) {
+				newpkg->replaces = alpm_list_add(newpkg->replaces, strdup(ptr));
+			} else if(!strcmp(key, "provides")) {
+				newpkg->provides = alpm_list_add(newpkg->provides, strdup(ptr));
+			} else if(!strcmp(key, "backup")) {
+				newpkg->backup = alpm_list_add(newpkg->backup, strdup(ptr));
+			} else {
+				_alpm_log(PM_LOG_DEBUG, "%s: syntax error in description file line %d\n",
+									newpkg->name ? newpkg->name : "error", linenum);
+			}
+		}
+		line[0] = '\0';
+	}
+
+	return(0);
+}
+
+/**
+ * Load a package and create the corresponding pmpkg_t struct.
+ * @param pkgfile path to the package file
+ * @param full whether to stop the load after metadata is read or continue
+ *             through the full archive
+ * @return An information filled pmpkg_t struct
+ */
+static pmpkg_t *pkg_load(const char *pkgfile, unsigned short full)
+{
+	int ret = ARCHIVE_OK;
+	int config = 0;
+	struct archive *archive;
+	struct archive_entry *entry;
+	pmpkg_t *newpkg = NULL;
+	struct stat st;
+
+	ALPM_LOG_FUNC;
+
+	if(pkgfile == NULL || strlen(pkgfile) == 0) {
+		RET_ERR(PM_ERR_WRONG_ARGS, NULL);
+	}
+
+	if((archive = archive_read_new()) == NULL) {
+		RET_ERR(PM_ERR_LIBARCHIVE, NULL);
+	}
+
+	archive_read_support_compression_all(archive);
+	archive_read_support_format_all(archive);
+
+	if (archive_read_open_filename(archive, pkgfile,
+				ARCHIVE_DEFAULT_BYTES_PER_BLOCK) != ARCHIVE_OK) {
+		RET_ERR(PM_ERR_PKG_OPEN, NULL);
+	}
+
+	newpkg = _alpm_pkg_new(NULL, NULL);
+	if(newpkg == NULL) {
+		archive_read_finish(archive);
+		RET_ERR(PM_ERR_MEMORY, NULL);
+	}
+
+  if(stat(pkgfile, &st) == 0) {
+		newpkg->size = st.st_size;
+	}
+
+	/* If full is false, only read through the archive until we find our needed
+	 * metadata. If it is true, read through the entire archive, which serves
+	 * as a verfication of integrity and allows us to create the filelist. */
+	while((ret = archive_read_next_header(archive, &entry)) == ARCHIVE_OK) {
+		const char *entry_name = archive_entry_pathname(entry);
+
+		if(strcmp(entry_name, ".PKGINFO") == 0) {
+			/* parse the info file */
+			if(parse_descfile(archive, newpkg) != 0) {
+				_alpm_log(PM_LOG_ERROR, _("could not parse package description file in %s\n"),
+						pkgfile);
+				goto pkg_invalid;
+			}
+			if(newpkg->name == NULL || strlen(newpkg->name) == 0) {
+				_alpm_log(PM_LOG_ERROR, _("missing package name in %s\n"), pkgfile);
+				goto pkg_invalid;
+			}
+			if(newpkg->version == NULL || strlen(newpkg->version) == 0) {
+				_alpm_log(PM_LOG_ERROR, _("missing package version in %s\n"), pkgfile);
+				goto pkg_invalid;
+			}
+			config = 1;
+			continue;
+		} else if(strcmp(entry_name,  ".INSTALL") == 0) {
+			newpkg->scriptlet = 1;
+		} else if(*entry_name == '.') {
+			/* for now, ignore all files starting with '.' that haven't
+			 * already been handled (for future possibilities) */
+		} else {
+			/* Keep track of all files for filelist generation */
+			newpkg->files = alpm_list_add(newpkg->files, strdup(entry_name));
+		}
+
+		if(archive_read_data_skip(archive)) {
+			_alpm_log(PM_LOG_ERROR, _("error while reading package %s: %s\n"),
+					pkgfile, archive_error_string(archive));
+			pm_errno = PM_ERR_LIBARCHIVE;
+			goto error;
+		}
+
+		/* if we are not doing a full read, see if we have all we need */
+		if(!full && config) {
+			break;
+		}
+	}
+
+	if(ret != ARCHIVE_EOF && ret != ARCHIVE_OK) { /* An error occured */
+		_alpm_log(PM_LOG_ERROR, _("error while reading package %s: %s\n"),
+				pkgfile, archive_error_string(archive));
+		pm_errno = PM_ERR_LIBARCHIVE;
+		goto error;
+	}
+
+	if(!config) {
+		_alpm_log(PM_LOG_ERROR, _("missing package metadata in %s\n"), pkgfile);
+		goto pkg_invalid;
+	}
+
+  archive_read_finish(archive);
+
+	/* internal fields for package struct */
+	newpkg->origin = PKG_FROM_FILE;
+	newpkg->origin_data.file = strdup(pkgfile);
+
+	if(full) {
+		/* "checking for conflicts" requires a sorted list, ensure that here */
+		_alpm_log(PM_LOG_DEBUG, "sorting package filelist for %s\n", pkgfile);
+		newpkg->files = alpm_list_msort(newpkg->files, alpm_list_count(newpkg->files),
+				_alpm_str_cmp);
+		newpkg->infolevel = INFRQ_ALL;
+	} else {
+		/* get rid of any partial filelist we may have collected, it is invalid */
+		FREELIST(newpkg->files);
+		newpkg->infolevel = INFRQ_BASE | INFRQ_DESC | INFRQ_DEPENDS;
+	}
+
+	return(newpkg);
+
+pkg_invalid:
+	pm_errno = PM_ERR_PKG_INVALID;
+error:
+	_alpm_pkg_free(newpkg);
+	archive_read_finish(archive);
+
+	return(NULL);
+}
+
+/** Create a package from a file.
+ * @param filename location of the package tarball
+ * @param full whether to stop the load after metadata is read or continue
+ *             through the full archive
+ * @param pkg address of the package pointer
+ * @return 0 on success, -1 on error (pm_errno is set accordingly)
+ */
+int SYMEXPORT alpm_pkg_load(const char *filename, unsigned short full,
+		pmpkg_t **pkg)
+{
+	ALPM_LOG_FUNC;
+
+	/* Sanity checks */
+	ASSERT(filename != NULL && strlen(filename) != 0,
+			RET_ERR(PM_ERR_WRONG_ARGS, -1));
+	ASSERT(pkg != NULL, RET_ERR(PM_ERR_WRONG_ARGS, -1));
+
+	*pkg = pkg_load(filename, full);
+	if(*pkg == NULL) {
+		/* pm_errno is set by pkg_load */
+		return(-1);
+	}
+
+	return(0);
+}
+
+/* vim: set ts=2 sw=2 noet: */