From c1abfeae1ec39a196262622662850b7d277a4734 Mon Sep 17 00:00:00 2001 From: Allan McRae Date: Wed, 18 Jul 2012 12:25:37 +1000 Subject: Detect inter-package conflicts between files and directories Detect a conflict between a file/symlink in one package and a directory in another when both are being installed at once. A side effect is the creation of conflicts between a directory symlink and a real directory (e.g lib -> usr/lib in pkg1 and /lib in pkg2). Given we can not guarantee pkg1 is installed before pkg2, this is a genuine conflict. Signed-off-by: Allan McRae --- lib/libalpm/filelist.c | 51 +++++++++++++++++++++++++++++++++++++------------- 1 file changed, 38 insertions(+), 13 deletions(-) (limited to 'lib/libalpm') diff --git a/lib/libalpm/filelist.c b/lib/libalpm/filelist.c index f6c0ed45..1928056d 100644 --- a/lib/libalpm/filelist.c +++ b/lib/libalpm/filelist.c @@ -82,27 +82,52 @@ alpm_list_t *_alpm_filelist_intersection(alpm_filelist_t *filesA, size_t ctrA = 0, ctrB = 0; while(ctrA < filesA->count && ctrB < filesB->count) { + int cmp, isdirA, isdirB; + char *strA, *strB; + alpm_file_t *fileA = filesA->files + ctrA; alpm_file_t *fileB = filesB->files + ctrB; - const char *strA = fileA->name; - const char *strB = fileB->name; - /* skip directories, we don't care about them */ + + isdirA = 0; + strA = fileA->name; if(strA[strlen(strA)-1] == '/') { + isdirA = 1; + strA = strndup(fileA->name, strlen(strA)-1); + } + + isdirB = 0; + strB = fileB->name; + if(strB[strlen(strB)-1] == '/') { + isdirB = 1; + strB = strndup(fileB->name, strlen(strB)-1); + } + + cmp = strcmp(strA, strB); + if(cmp < 0) { ctrA++; - } else if(strB[strlen(strB)-1] == '/') { + } else if(cmp > 0) { ctrB++; } else { - int cmp = strcmp(strA, strB); - if(cmp < 0) { - ctrA++; - } else if(cmp > 0) { - ctrB++; - } else { - /* item in both, qualifies as an intersect */ + /* TODO: this creates conflicts between a symlink to a directory in + * one package and a real directory in the other. For example, + * lib -> /usr/lib in pkg1 and /lib in pkg2. This would be allowed + * when installing one package at a time _provided_ pkg1 is installed + * first. This will need adjusted if the order of package install can + * be guaranteed to install the symlink first */ + + /* when not directories, item in both qualifies as an intersect */ + if(! (isdirA && isdirB)) { ret = alpm_list_add(ret, fileA); - ctrA++; - ctrB++; } + ctrA++; + ctrB++; + } + + if(isdirA) { + free(strA); + } + if(isdirB) { + free(strB); } } -- cgit v1.2.3-70-g09d2