New feature: files verification

This implements FS#13877. Add a new option "-Qk" which checks if all of the
files for a given package (or packages) are really on the system (i.e. not
accidentally deleted). This can be combined with filters and other display
options. It also respects both the --quiet and --verbose flags to give
varying levels of output.

Based on the original patch by Charly Coste <changaco@laposte.net>, thanks
for your work!

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

6 files changed, 91 insertions, 13 deletions

diff --git a/contrib/bash_completion b/contrib/bash_completion
index 11f021c8..65135cfd 100644
--- a/contrib/bash_completion
+++ b/contrib/bash_completion
@@ -183,6 +183,7 @@ _pacman ()
           search) mod="${mod}s" ;;
           upgrades) mod="${mod}u" ;;
           cascade) mod="${mod}c" ;;
+          check) mod="${mod}k" ;;
           dbonly) mod="${mod}k" ;;
           nosave) mod="${mod}n" ;;
           recursive) mod="${mod}s" ;;
@@ -294,6 +295,7 @@ _pacman ()
           -g --groups \
           -h --help \
           -i --info \
+          -k --check \
           -l --list \
           -m --foreign \
           -o --owns \
diff --git a/contrib/zsh_completion b/contrib/zsh_completion
index e1273184..2f43d9b2 100644
--- a/contrib/zsh_completion
+++ b/contrib/zsh_completion
@@ -50,6 +50,7 @@ _pacman_opts_query_modifiers=(
 	'-e[List packages explicitly installed]'
 	'-i[View package information]'
 	'-ii[View package information including backup files]'
+	'-k[Check package files]'
 	'-l[List package contents]'
 	'-m[List installed packages not found in sync db(s)]'
 	'-t[List packages not required by any package]'
diff --git a/doc/pacman.8.txt b/doc/pacman.8.txt
index af85a15e..b56ad6b5 100644
--- a/doc/pacman.8.txt
+++ b/doc/pacman.8.txt
@@ -196,6 +196,11 @@ Query Options[[QO]]
 	'\--info' or '-i' flags will also display the list of backup files and
 	their modification states.
 
+*-k \--check*::
+	Check that all files owned by the given package(s) are present on the
+	system. If packages are not specified or filter flags are not provided,
+	check all installed packages.
+
 *-l, \--list*::
 	List all files owned by a given package. Multiple packages can be
 	specified on the command line.
@@ -220,7 +225,8 @@ Query Options[[QO]]
 	names and not version, group, and description information; owns will
 	only show package names instead of "file is owned by pkg" messages; group
 	will only show package names and omit group names; list will only show
-	files and omit package names; a bare query will only show package names
+	files and omit package names; check will only show pairs of package names
+	and missing files; a bare query will only show package names
 	rather than names and versions.
 
 *-s, \--search* <'regexp'>::
diff --git a/src/pacman/conf.h b/src/pacman/conf.h
index 39802ca8..6523d490 100644
--- a/src/pacman/conf.h
+++ b/src/pacman/conf.h
@@ -51,6 +51,7 @@ typedef struct __config_t {
 	unsigned short op_q_search;
 	unsigned short op_q_changelog;
 	unsigned short op_q_upgrade;
+	unsigned short op_q_check;
 
 	unsigned short op_s_clean;
 	unsigned short op_s_downloadonly;
diff --git a/src/pacman/pacman.c b/src/pacman/pacman.c
index 7f864891..48d45ad1 100644
--- a/src/pacman/pacman.c
+++ b/src/pacman/pacman.c
@@ -108,6 +108,7 @@ static void usage(int op, const char * const myname)
 			printf(_("  -e, --explicit       list packages explicitly installed [filter]\n"));
 			printf(_("  -g, --groups         view all members of a package group\n"));
 			printf(_("  -i, --info           view package information (-ii for backup files)\n"));
+			printf(_("  -k, --check          check that the files owned by the package(s) are present\n"));
 			printf(_("  -l, --list           list the contents of the queried package\n"));
 			printf(_("  -m, --foreign        list installed packages not found in sync db(s) [filter]\n"));
 			printf(_("  -o, --owns <file>    query the package that owns <file>\n"));
@@ -345,6 +346,7 @@ static int parseargs(int argc, char *argv[])
 		{"help",       no_argument,       0, 'h'},
 		{"info",       no_argument,       0, 'i'},
 		{"dbonly",     no_argument,       0, 'k'},
+		{"check",      no_argument,       0, 'k'},
 		{"list",       no_argument,       0, 'l'},
 		{"foreign",    no_argument,       0, 'm'},
 		{"nosave",     no_argument,       0, 'n'},
@@ -473,7 +475,10 @@ static int parseargs(int argc, char *argv[])
 			case 'g': (config->group)++; break;
 			case 'h': config->help = 1; break;
 			case 'i': (config->op_q_info)++; (config->op_s_info)++; break;
-			case 'k': config->flags |= PM_TRANS_FLAG_DBONLY; break;
+			case 'k':
+				config->flags |= PM_TRANS_FLAG_DBONLY;
+				config->op_q_check = 1;
+				break;
 			case 'l': config->op_q_list = 1; break;
 			case 'm': config->op_q_foreign = 1; break;
 			case 'n': config->flags |= PM_TRANS_FLAG_NOSAVE; break;
diff --git a/src/pacman/query.c b/src/pacman/query.c
index 49972028..23be7524 100644
--- a/src/pacman/query.c
+++ b/src/pacman/query.c
@@ -309,8 +309,60 @@ static int filter(pmpkg_t *pkg)
 	return(1);
 }
 
-static void display(pmpkg_t *pkg)
+/* Loop through the packages. For each package,
+ * loop through files to check if they exist. */
+static int check(pmpkg_t *pkg)
 {
+	alpm_list_t *i;
+	const char *root;
+	int allfiles = 0, errors = 0;
+	size_t rootlen;
+	char f[PATH_MAX];
+
+	root = alpm_option_get_root();
+	rootlen = strlen(root);
+	if(rootlen + 1 > PATH_MAX) {
+		/* we are in trouble here */
+		pm_fprintf(stderr, PM_LOG_ERROR, _("root path too long\n"));
+		return(1);
+	}
+	strcpy(f, root);
+
+	const char *pkgname = alpm_pkg_get_name(pkg);
+	for(i = alpm_pkg_get_files(pkg); i; i = alpm_list_next(i)) {
+		struct stat st;
+		const char *path = alpm_list_getdata(i);
+
+		if(rootlen + 1 + strlen(path) > PATH_MAX) {
+			pm_fprintf(stderr, PM_LOG_WARNING, _("file path too long\n"));
+			continue;
+		}
+		strcpy(f + rootlen, path);
+		allfiles++;
+		/* use lstat to prevent errors from symlinks */
+		if(lstat(f, &st) != 0) {
+			if(config->quiet) {
+				printf("%s %s\n", pkgname, f);
+			} else {
+				pm_printf(PM_LOG_WARNING, "%s: missing %s (%s)\n",
+						pkgname, f, strerror(errno));
+			}
+			errors++;
+		}
+	}
+
+	if(!config->quiet) {
+		printf("%s: %d total, %d missing file(s)\n",
+				pkgname, allfiles, errors);
+	}
+
+	return(errors != 0 ? 1 : 0);
+}
+
+static int display(pmpkg_t *pkg)
+{
+	int ret = 0;
+
 	if(config->op_q_info) {
 		if(config->op_q_isfile) {
 			/* omit info that isn't applicable for a file package */
@@ -325,19 +377,25 @@ static void display(pmpkg_t *pkg)
 	if(config->op_q_changelog) {
 		dump_pkg_changelog(pkg);
 	}
-	if(!config->op_q_info && !config->op_q_list && !config->op_q_changelog) {
+	if(config->op_q_check) {
+		ret = check(pkg);
+	}
+	if(!config->op_q_info && !config->op_q_list
+			&& !config->op_q_changelog && !config->op_q_check) {
 		if (!config->quiet) {
 			printf("%s %s\n", alpm_pkg_get_name(pkg), alpm_pkg_get_version(pkg));
 		} else {
 			printf("%s\n", alpm_pkg_get_name(pkg));
 		}
 	}
+	return(ret);
 }
 
 int pacman_query(alpm_list_t *targets)
 {
 	int ret = 0;
 	alpm_list_t *i;
+	pmpkg_t *pkg = NULL;
 
 	/* First: operations that do not require targets */
 
@@ -358,12 +416,12 @@ int pacman_query(alpm_list_t *targets)
 		alpm_list_t *sync_dbs = alpm_option_get_syncdbs();
 		if(sync_dbs == NULL || alpm_list_count(sync_dbs) == 0) {
 			pm_printf(PM_LOG_ERROR, _("no usable package repositories configured.\n"));
-			return(-1);
+			return(1);
 		}
 	}
 
 	/* operations on all packages in the local DB
-	 * valid: no-op (plain -Q), list, info
+	 * valid: no-op (plain -Q), list, info, check
 	 * invalid: isfile, owns */
 	if(targets == NULL) {
 		if(config->op_q_isfile || config->op_q_owns) {
@@ -372,12 +430,15 @@ int pacman_query(alpm_list_t *targets)
 		}
 
 		for(i = alpm_db_get_pkgcache(db_local); i; i = alpm_list_next(i)) {
-			pmpkg_t *pkg = alpm_list_getdata(i);
+			pkg = alpm_list_getdata(i);
 			if(filter(pkg)) {
-				display(pkg);
+				int value = display(pkg);
+				if(value != 0) {
+					ret = 1;
+				}
 			}
 		}
-		return(0);
+		return(ret);
 	}
 
 	/* Second: operations that require target(s) */
@@ -389,10 +450,9 @@ int pacman_query(alpm_list_t *targets)
 	}
 
 	/* operations on named packages in the local DB
-	 * valid: no-op (plain -Q), list, info */
+	 * valid: no-op (plain -Q), list, info, check */
 	for(i = targets; i; i = alpm_list_next(i)) {
 		char *strname = alpm_list_getdata(i);
-		pmpkg_t *pkg = NULL;
 
 		if(config->op_q_isfile) {
 			alpm_pkg_load(strname, 1, &pkg);
@@ -402,12 +462,15 @@ int pacman_query(alpm_list_t *targets)
 
 		if(pkg == NULL) {
 			pm_fprintf(stderr, PM_LOG_ERROR, _("package \"%s\" not found\n"), strname);
-			ret++;
+			ret = 1;
 			continue;
 		}
 
 		if(filter(pkg)) {
-			display(pkg);
+			int value = display(pkg);
+			if(value != 0) {
+				ret = 1;
+			}
 		}
 
 		if(config->op_q_isfile) {