X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=src%2Fvunify.c;fp=src%2Fvunify.c;h=3e9740928f7aca5213bc5583d3a8848f3a0517c9;hb=3f3cf95f755f3ef1c31ad8e38153deb4ee214c66;hp=0000000000000000000000000000000000000000;hpb=bfa4b37aaa195007a09bc166e8c8563d5a3c2ef1;p=util-vserver.git diff --git a/src/vunify.c b/src/vunify.c new file mode 100644 index 0000000..3e97409 --- /dev/null +++ b/src/vunify.c @@ -0,0 +1,422 @@ +// $Id: vunify.c,v 1.15 2005/03/24 12:44:17 ensc Exp $ --*- c -*-- + +// Copyright (C) 2003,2004 Enrico Scholz +// +// 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; version 2 of the License. +// +// 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, write to the Free Software +// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + +#ifdef HAVE_CONFIG_H +# include +#endif + +#include "vunify.h" +#include "util.h" + +#include "lib_internal/unify.h" +#include "lib_internal/matchlist.h" +#include "lib_internal/util-dotfile.h" +#include "lib_internal/util-safechdir.h" +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define ENSC_WRAPPERS_IO 1 +#define ENSC_WRAPPERS_FCNTL 1 +#define ENSC_WRAPPERS_DIRENT 1 +#define ENSC_WRAPPERS_UNISTD 1 +#define ENSC_WRAPPERS_STDLIB 1 +#include + +int wrapper_exit_code = 1; + + +#define CMD_HELP 0x8000 +#define CMD_VERSION 0x8001 +#define CMD_MANUALLY 0x8002 + +struct option const +CMDLINE_OPTIONS[] = { + { "help", no_argument, 0, CMD_HELP }, + { "version", no_argument, 0, CMD_VERSION }, + { "manually", no_argument, 0, CMD_MANUALLY }, + { 0,0,0,0 } +}; + +static struct WalkdownInfo global_info; +static struct SkipReason skip_reason; +static struct Arguments const * global_args; + +int Global_getVerbosity() { + return global_args->verbosity; +} + +bool Global_doRenew() { + return global_args->do_renew; +} + +static void +showHelp(int fd, char const *cmd, int res) +{ + WRITE_MSG(fd, "Usage:\n "); + WRITE_STR(fd, cmd); + WRITE_MSG(fd, + " [-Rnv] \n or\n "); + WRITE_STR(fd, cmd); + WRITE_MSG(fd, + " --manually [-Rnvx] [--] [ ]+\n\n" + " --manually ... unify generic paths; excludelists must be generated\n" + " manually\n" + " -R ... revert operation; deunify files\n" + " -n ... do not modify anything; just show what there will be\n" + " done (in combination with '-v')\n" + " -v ... verbose mode\n" + " -x ... do not cross filesystems; this is valid in manual\n" + " mode only and will be ignored for vserver unification\n\n" + "Please report bugs to " PACKAGE_BUGREPORT "\n"); +#if 0 + " -C ... use cached excludelists; usually they will be\n" + " regenerated after package installation to reflect e.g.\n" + " added/removed configuration files\n\n" +#endif + exit(res); +} + +static void +showVersion() +{ + WRITE_MSG(1, + "vunify " VERSION " -- unifies vservers and/or directories\n" + "This program is part of " PACKAGE_STRING "\n\n" + "Copyright (C) 2003,2004 Enrico Scholz\n" + VERSION_COPYRIGHT_DISCLAIMER); + exit(0); +} + +// Returns 'false' iff one of the files is not existing, or of the files are different/not unifyable +static bool +checkFstat(struct MatchList const * const mlist, + PathInfo const * const basename, + PathInfo const * const path, + struct stat const ** const dst_fstat, struct stat * const dst_fstat_buf, + struct stat * const src_fstat) +{ + assert(basename->d[0] != '/'); + + if (*dst_fstat==0) { + // local file does not exist... strange + // TODO: message + skip_reason.r = rsFSTAT; + if (lstat(basename->d, dst_fstat_buf)==-1) return false; + *dst_fstat = dst_fstat_buf; + } + + assert(*dst_fstat!=0); + + + PathInfo src_path = mlist->root; + char src_path_buf[ENSC_PI_APPSZ(src_path, *path)]; + + PathInfo_append(&src_path, path, src_path_buf); + + // source file does not exist + skip_reason.r = rsNOEXISTS; + if (lstat(src_path.d, src_fstat)==-1) return false; + + // these are directories; this succeeds everytime + if (S_ISDIR((*dst_fstat)->st_mode) && S_ISDIR(src_fstat->st_mode)) return true; + + // both files are different, so return false + skip_reason.r = rsDIFFERENT; + if ((!global_args->do_revert && !Unify_isUnifyable(*dst_fstat, src_fstat)) || + ( global_args->do_revert && !Unify_isUnified (*dst_fstat, src_fstat))) + return false; + + // these are the same files + return true; +} + +static struct MatchList const * +checkDirEntry(PathInfo const *path, + PathInfo const *d_path, bool *is_dir, + struct stat *src_stat, struct stat *dst_stat) +{ + struct WalkdownInfo const * const info = &global_info; + struct MatchList const * mlist; + struct stat const * cache_stat; + + // Check if it is in the exclude/include list of the destination vserver and + // abort when it is not matching an allowed entry + skip_reason.r = rsEXCL_DST; + skip_reason.d.list = &info->dst_list; + if (MatchList_compare(&info->dst_list, path->d)!=stINCLUDE) return 0; + + // Now, go through the reference vservers and do the lightweigt list-check + // first and compare then the fstat's. + for (mlist=info->src_lists.v; mlistsrc_lists.v+info->src_lists.l; ++mlist) { + cache_stat = 0; + skip_reason.r = rsEXCL_SRC; + skip_reason.d.list = mlist; + if (MatchList_compare(mlist, path->d)==stINCLUDE && + checkFstat(mlist, d_path, path, &cache_stat, dst_stat, src_stat)) { + + // Failed the check or is it a symlink which can not be handled + if (cache_stat==0) return 0; + + skip_reason.r = rsSYMLINK; + if (S_ISLNK(dst_stat->st_mode)) return 0; + + skip_reason.r = rsSPECIAL; + if (!S_ISREG(dst_stat->st_mode) && + !S_ISDIR(dst_stat->st_mode)) return 0; + + *is_dir = S_ISDIR(dst_stat->st_mode); + return mlist; + } + else if (cache_stat!=0 && !global_args->do_revert && + skip_reason.r == rsDIFFERENT && + Unify_isUnified(cache_stat, src_stat)) { + skip_reason.r = rsUNIFIED; + skip_reason.d.list = mlist; + return 0; + } + } + + // No luck... + return 0; +} + +static bool +updateSkipDepth(PathInfo const *path, bool walk_down) +{ + struct WalkdownInfo const * const info = &global_info; + struct MatchList * mlist; + bool result = false; + + for (mlist=info->src_lists.v; mlistsrc_lists.v+info->src_lists.l; ++mlist) { + // The easy way... this path is being skipped already + if (mlist->skip_depth>0) { + if (walk_down) ++mlist->skip_depth; + else --mlist->skip_depth; + continue; + } + else if (walk_down) { + PathInfo src_path = mlist->root; + char src_path_buf[ENSC_PI_APPSZ(src_path, *path)]; + struct stat src_fstat; + + PathInfo_append(&src_path, path, src_path_buf); + + // when the file/dir exist, we have do go deeper. + // else skip it in deeper runs for *this* matchlist + if (lstat(src_path.d, &src_fstat)!=-1) result = true; + else ++mlist->skip_depth; + } + else { + // TODO: warning + } + } + + return result; +} + +static bool +doit(struct MatchList const *mlist, + PathInfo const *src_path, struct stat const *src_stat, + char const *dst_path, struct stat const UNUSED *dst_stat) +{ + PathInfo path = mlist->root; + char path_buf[ENSC_PI_APPSZ(path, *src_path)]; + + if (global_args->do_dry_run || Global_getVerbosity()>=2) { + if (global_args->do_revert) WRITE_MSG(1, "deunifying '"); + else WRITE_MSG(1, "unifying '"); + + Vwrite(1, src_path->d, src_path->l); + WRITE_MSG(1, "'"); + + if (Global_getVerbosity()>=4) { + WRITE_MSG(1, " (from "); + if (Global_getVerbosity()==4 && mlist->id.d) + Vwrite(1, mlist->id.d, mlist->id.l); + else + Vwrite(1, mlist->root.d, mlist->root.l); + WRITE_MSG(1, ")"); + } + WRITE_MSG(1, "\n"); + } + + PathInfo_append(&path, src_path, path_buf); + return (global_args->do_dry_run || + (!global_args->do_revert && Unify_unify (path.d, src_stat, dst_path, false)) || + ( global_args->do_revert && Unify_deUnify(dst_path))); +} + + +static void +printSkipReason() +{ + WRITE_MSG(1, " ("); + switch (skip_reason.r) { + case rsDOTFILE : WRITE_MSG(1, "dotfile"); break; + case rsEXCL_DST : + case rsEXCL_SRC : + WRITE_MSG(1, "excluded by "); + MatchList_printId(skip_reason.d.list, 1); + break; + case rsFSTAT : WRITE_MSG(1, "fstat error"); break; + case rsNOEXISTS : WRITE_MSG(1, "does not exist in refserver(s)"); break; + case rsSYMLINK : WRITE_MSG(1, "symlink"); break; + case rsSPECIAL : WRITE_MSG(1, "non regular file"); break; + case rsUNIFIED : WRITE_MSG(1, "already unified"); break; + case rsDIFFERENT : WRITE_MSG(1, "different"); break; + default : assert(false); abort(); + } + WRITE_MSG(1, ")"); +} + +#include "vserver-visitdir.hc" + +static uint64_t +visitDirEntry(struct dirent const *ent) +{ + bool is_dir; + struct MatchList const * match; + struct stat f_stat = { .st_dev = 0 }; + char const * dirname = ent->d_name; + PathInfo path = global_info.state; + PathInfo d_path = { + .d = dirname, + .l = strlen(dirname) + }; + char path_buf[ENSC_PI_APPSZ(path, d_path)]; + bool is_dotfile; + struct stat src_stat; + uint64_t res = 1; + + PathInfo_append(&path, &d_path, path_buf); + + is_dotfile = isDotfile(dirname); + skip_reason.r = rsDOTFILE; + + if (is_dotfile || + (match=checkDirEntry(&path, &d_path, &is_dir, &src_stat, &f_stat))==0) { + bool is_link = is_dotfile ? false : S_ISLNK(f_stat.st_mode); + + if (Global_getVerbosity()>=1 && + (Global_getVerbosity()>=3 || skip_reason.r!=rsUNIFIED) && + ((!is_dotfile && !is_link) || + (Global_getVerbosity()>=6 && is_dotfile) || + (Global_getVerbosity()>=6 && is_link)) ) { + WRITE_MSG(1, " skipping '"); + Vwrite(1, path.d, path.l); + WRITE_MSG(1, "'"); + if (Global_getVerbosity()>=2) printSkipReason(); + WRITE_MSG(1, "\n"); + } + return 0; + } + + if (is_dir) { + if (updateSkipDepth(&path, true)) { + res = visitDir(dirname, &f_stat); + updateSkipDepth(&path, false); + } + else + res = 0; + } + else if (!doit(match, &path, &src_stat, dirname, &f_stat)) { + // TODO: message + } + else + res = 0; + + return res; +} + +#include "vunify-init.hc" + +int main(int argc, char *argv[]) +{ + struct Arguments args = { + .mode = mdVSERVER, + .do_revert = false, + .do_dry_run = false, + .verbosity = 0, + .local_fs = false, + .do_renew = true, + }; + + global_args = &args; + while (1) { + int c = getopt_long(argc, argv, "Rnvcx", + CMDLINE_OPTIONS, 0); + if (c==-1) break; + + switch (c) { + case CMD_HELP : showHelp(1, argv[0], 0); + case CMD_VERSION : showVersion(); + case CMD_MANUALLY : args.mode = mdMANUALLY; break; + case 'R' : args.do_revert = true; break; + case 'n' : args.do_dry_run = true; break; + case 'x' : args.local_fs = true; break; + //case 'C' : args.do_renew = false; break; + case 'v' : ++args.verbosity; break; + default : + WRITE_MSG(2, "Try '"); + WRITE_STR(2, argv[0]); + WRITE_MSG(2, " --help\" for more information.\n"); + return EXIT_FAILURE; + break; + } + } + + if (argc==optind) { + WRITE_MSG(2, "No directory/vserver given\n"); + return EXIT_FAILURE; + } + + switch (args.mode) { + case mdMANUALLY : initModeManually(&args, argc-optind, argv+optind); break; + case mdVSERVER : initModeVserver (&args, argc-optind, argv+optind); break; + default : assert(false); return EXIT_FAILURE; + } + + global_info.state.d = ""; + global_info.state.l = 0; + + + if (Global_getVerbosity()>=1) WRITE_MSG(1, "Starting to traverse directories...\n"); + Echdir(global_info.dst_list.root.d); + visitDir("/", 0); + +#ifndef NDEBUG + { + size_t i; + MatchList_destroy(&global_info.dst_list); + for (i=0; i