pkgconf/pkg.c

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/*
* pkg.c
* higher-level dependency graph compilation, management and manipulation
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*
* Copyright (c) 2011, 2012 William Pitcock <nenolod@dereferenced.org>.
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*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "pkg.h"
#include "bsdstubs.h"
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#ifdef _WIN32
# define PKG_CONFIG_REG_KEY "Software\\pkgconfig\\PKG_CONFIG_PATH"
#endif
#define PKG_CONFIG_EXT ".pc"
#define PKG_CONFIG_PATH_SZ (65535)
/* pkg-config uses ';' on win32 as ':' is part of path */
#ifdef _WIN32
#define PKG_CONFIG_PATH_SEP_S ";"
#else
#define PKG_CONFIG_PATH_SEP_S ":"
#endif
static inline size_t
path_split(const char *text, char ***parv)
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{
size_t count = 0;
char *workbuf, *p, *iter;
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if (text == NULL)
return 0;
*parv = malloc(sizeof (void *));
iter = workbuf = strdup(text);
while ((p = strtok(iter, PKG_CONFIG_PATH_SEP_S)) != NULL)
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{
(*parv)[count] = strdup(p);
count++, iter = NULL;
*parv = realloc(*parv, sizeof (void *) * (count + 1));
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}
free(workbuf);
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return count;
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}
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static inline void
path_free(char **parv, size_t count)
{
size_t iter;
if (parv == NULL)
return;
for (iter = 0; iter < count; iter++)
free(parv[iter]);
free(parv);
}
static inline bool
str_has_suffix(const char *str, const char *suffix)
{
size_t str_len = strlen(str);
size_t suf_len = strlen(suffix);
if (str_len < suf_len)
return false;
return !strncasecmp(str + str_len - suf_len, suffix, suf_len);
}
static inline const char *
get_pkgconfig_path(void)
{
const char *env_path;
#ifdef _WIN32
static char outbuf[MAX_PATH];
char namebuf[MAX_PATH];
char *p;
#endif
env_path = getenv("PKG_CONFIG_LIBDIR");
if (env_path != NULL)
return env_path;
#ifdef _WIN32
GetModuleFileName(NULL, namebuf, sizeof namebuf);
p = strrchr(namebuf, '\\');
if (p == NULL)
p = strrchr(namebuf, '/');
if (p == NULL)
return PKG_DEFAULT_PATH;
*p = '\0';
strlcpy(outbuf, namebuf, sizeof outbuf);
strlcat(outbuf, "/lib/pkgconfig", sizeof outbuf);
return outbuf;
#endif
return PKG_DEFAULT_PATH;
}
/*
* pkg_new_from_file(filename, file)
*
* Parse a .pc file into a pkg_t object structure.
*/
pkg_t *
pkg_new_from_file(const char *filename, FILE *f)
{
pkg_t *pkg;
char readbuf[BUFSIZ];
pkg = calloc(sizeof(pkg_t), 1);
pkg->filename = strdup(filename);
while (pkg_fgetline(readbuf, BUFSIZ, f) != NULL)
{
char op, *p, *key = NULL, *value = NULL;
readbuf[strlen(readbuf) - 1] = '\0';
p = readbuf;
while (*p && (isalpha(*p) || isdigit(*p) || *p == '_' || *p == '.'))
p++;
key = strndup(readbuf, p - readbuf);
if (!isalpha(*key) && !isdigit(*p))
goto cleanup;
while (*p && isspace(*p))
p++;
op = *p++;
while (*p && isspace(*p))
p++;
value = strdup(p);
switch (op)
{
case ':':
if (!strcasecmp(key, "Name"))
pkg->realname = pkg_tuple_parse(pkg->vars, value);
else if (!strcasecmp(key, "Description"))
pkg->description = pkg_tuple_parse(pkg->vars, value);
else if (!strcasecmp(key, "Version"))
pkg->version = pkg_tuple_parse(pkg->vars, value);
else if (!strcasecmp(key, "CFLAGS"))
pkg->cflags = pkg_fragment_parse(pkg->cflags, pkg->vars, value);
else if (!strcasecmp(key, "LIBS"))
pkg->libs = pkg_fragment_parse(pkg->libs, pkg->vars, value);
else if (!strcasecmp(key, "LIBS.private"))
pkg->libs_private = pkg_fragment_parse(pkg->libs_private, pkg->vars, value);
else if (!strcasecmp(key, "Requires"))
pkg->requires = pkg_dependency_parse(pkg, value);
else if (!strcasecmp(key, "Requires.private"))
pkg->requires_private = pkg_dependency_parse(pkg, value);
else if (!strcasecmp(key, "Conflicts"))
pkg->conflicts = pkg_dependency_parse(pkg, value);
break;
case '=':
pkg->vars = pkg_tuple_add(pkg->vars, key, value);
break;
default:
break;
}
cleanup:
if (key)
free(key);
if (value)
free(value);
}
fclose(f);
return pkg;
}
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void
pkg_free(pkg_t *pkg)
{
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if (pkg == NULL)
return;
pkg_dependency_free(pkg->requires);
pkg_dependency_free(pkg->requires_private);
pkg_dependency_free(pkg->conflicts);
pkg_fragment_free(pkg->cflags);
pkg_fragment_free(pkg->libs);
pkg_fragment_free(pkg->libs_private);
pkg_tuple_free(pkg->vars);
if (pkg->flags & PKG_PROPF_VIRTUAL)
return;
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if (pkg->id != NULL)
free(pkg->id);
if (pkg->filename != NULL)
free(pkg->filename);
if (pkg->realname != NULL)
free(pkg->realname);
if (pkg->version != NULL)
free(pkg->version);
if (pkg->description != NULL)
free(pkg->description);
if (pkg->url != NULL)
free(pkg->url);
if (pkg->pc_filedir != NULL)
free(pkg->pc_filedir);
free(pkg);
}
static inline pkg_t *
pkg_try_specific_path(const char *path, const char *name, unsigned int flags)
{
pkg_t *pkg = NULL;
FILE *f;
char locbuf[PKG_CONFIG_PATH_SZ];
char uninst_locbuf[PKG_CONFIG_PATH_SZ];
snprintf(locbuf, sizeof locbuf, "%s/%s" PKG_CONFIG_EXT, path, name);
snprintf(uninst_locbuf, sizeof uninst_locbuf, "%s/%s-uninstalled" PKG_CONFIG_EXT, path, name);
if (!(flags & PKGF_NO_UNINSTALLED) && (f = fopen(uninst_locbuf, "r")) != NULL)
{
pkg = pkg_new_from_file(uninst_locbuf, f);
pkg->uninstalled = true;
}
else if ((f = fopen(locbuf, "r")) != NULL)
pkg = pkg_new_from_file(locbuf, f);
return pkg;
}
#ifdef _WIN32
pkg_t *
pkg_find_in_registry_key(HKEY hkey, const char *name, unsigned int flags)
{
pkg_t *pkg = NULL;
HKEY key;
int i = 0;
char buf[16384]; /* per registry limits */
DWORD bufsize = sizeof buf;
if (RegOpenKeyEx(hkey, PKG_CONFIG_REG_KEY,
0, KEY_READ, &key) != ERROR_SUCCESS)
return NULL;
while (RegEnumValue(key, i++, buf, &bufsize, NULL, NULL, NULL, NULL)
== ERROR_SUCCESS)
{
BYTE pathbuf[PKG_CONFIG_PATH_SZ];
DWORD type;
DWORD pathbuflen = sizeof pathbuf;
if (RegQueryValueEx(key, buf, NULL, &type, pathbuf, &pathbuflen)
== ERROR_SUCCESS && type == REG_SZ)
{
pkg = pkg_try_specific_path(pathbuf, name, flags);
if (pkg != NULL)
break;
}
bufsize = sizeof buf;
}
RegCloseKey(key);
return pkg;
}
#endif
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pkg_t *
pkg_find(const char *name, unsigned int flags)
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{
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char **path = NULL;
size_t count = 0, iter = 0;
const char *env_path;
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pkg_t *pkg = NULL;
FILE *f;
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/* name might actually be a filename. */
if (str_has_suffix(name, PKG_CONFIG_EXT))
{
if ((f = fopen(name, "r")) != NULL)
return pkg_new_from_file(name, f);
}
/* PKG_CONFIG_PATH has to take precedence */
env_path = getenv("PKG_CONFIG_PATH");
if (env_path)
{
count = path_split(env_path, &path);
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for (iter = 0; iter < count; iter++)
{
pkg = pkg_try_specific_path(path[iter], name, flags);
if (pkg != NULL)
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goto out;
}
path_free(path, count);
}
env_path = get_pkgconfig_path();
if (!(flags & PKGF_ENV_ONLY))
{
count = path_split(env_path, &path);
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for (iter = 0; iter < count; iter++)
{
pkg = pkg_try_specific_path(path[iter], name, flags);
if (pkg != NULL)
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goto out;
}
}
#ifdef _WIN32
/* support getting PKG_CONFIG_PATH from registry */
pkg = pkg_find_in_registry_key(HKEY_CURRENT_USER, name, flags);
if (!pkg)
pkg = pkg_find_in_registry_key(HKEY_LOCAL_MACHINE, name, flags);
#endif
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out:
path_free(path, count);
return pkg;
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}
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/*
* pkg_compare_version(a, b)
*
* compare versions using RPM version comparison rules as described in the LSB.
*/
int
pkg_compare_version(const char *a, const char *b)
{
char oldch1, oldch2;
char buf1[BUFSIZ], buf2[BUFSIZ];
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char *str1, *str2;
char *one, *two;
int ret;
bool isnum;
/* optimization: if version matches then it's the same version. */
if (!strcasecmp(a, b))
return 0;
strlcpy(buf1, a, sizeof buf1);
strlcpy(buf2, b, sizeof buf2);
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one = str1 = buf1;
two = str2 = buf2;
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while (*one && *two)
{
while (*one && !isalnum(*one))
one++;
while (*two && !isalnum(*two))
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two++;
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if (!(*one && *two))
break;
str1 = one;
str2 = two;
if (isdigit(*str1))
{
while (*str1 && isdigit(*str1))
str1++;
while (*str2 && isdigit(*str2))
str2++;
isnum = true;
}
else
{
while (*str1 && isalpha(*str1))
str1++;
while (*str2 && isalpha(*str2))
str2++;
isnum = false;
}
oldch1 = *str1;
oldch2 = *str2;
*str1 = '\0';
*str2 = '\0';
if (one == str1)
return -1;
if (two == str2)
return (isnum ? 1 : -1);
if (isnum)
{
int onelen, twolen;
while (*one == '0')
one++;
while (*two == '0')
two++;
onelen = strlen(one);
twolen = strlen(two);
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if (onelen > twolen)
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return 1;
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else if (twolen > onelen)
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return -1;
}
ret = strcmp(one, two);
if (ret)
return ret;
*str1 = oldch1;
*str2 = oldch2;
one = str1;
two = str2;
}
if ((!*one) && (!*two))
return 0;
if (!*one)
return -1;
return 1;
}
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/*
* pkg_get_comparator(pkgdep)
*
* returns the comparator used in a depgraph dependency node as a string.
*/
const char *
pkg_get_comparator(pkg_dependency_t *pkgdep)
{
switch(pkgdep->compare)
{
case PKG_LESS_THAN:
return "<";
case PKG_GREATER_THAN:
return ">";
case PKG_LESS_THAN_EQUAL:
return "<=";
case PKG_GREATER_THAN_EQUAL:
return ">=";
case PKG_EQUAL:
return "=";
case PKG_NOT_EQUAL:
return "!=";
case PKG_ANY:
return "(any)";
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default:
return "???";
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}
return "???";
}
static pkg_t pkg_config_virtual = {
.id = "pkg-config",
.realname = "pkg-config",
.version = PKG_PKGCONFIG_VERSION_EQUIV,
.flags = PKG_PROPF_VIRTUAL,
};
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/*
* pkg_verify_dependency(pkgdep, flags)
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*
* verify a pkg_dependency_t node in the depgraph. if the dependency is solvable,
* return the appropriate pkg_t object, else NULL.
*/
pkg_t *
pkg_verify_dependency(pkg_dependency_t *pkgdep, unsigned int flags, unsigned int *eflags)
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{
pkg_t *pkg = &pkg_config_virtual;
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if (eflags != NULL)
*eflags = PKG_ERRF_OK;
/* pkg-config package name is special cased. */
if (strcasecmp(pkgdep->package, "pkg-config"))
{
pkg = pkg_find(pkgdep->package, flags);
if (pkg == NULL)
{
if (eflags != NULL)
*eflags |= PKG_ERRF_PACKAGE_NOT_FOUND;
return NULL;
}
}
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if (pkg->id == NULL)
pkg->id = strdup(pkgdep->package);
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switch(pkgdep->compare)
{
case PKG_LESS_THAN:
if (pkg_compare_version(pkg->version, pkgdep->version) < 0)
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return pkg;
break;
case PKG_GREATER_THAN:
if (pkg_compare_version(pkg->version, pkgdep->version) > 0)
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return pkg;
break;
case PKG_LESS_THAN_EQUAL:
if (pkg_compare_version(pkg->version, pkgdep->version) <= 0)
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return pkg;
break;
case PKG_GREATER_THAN_EQUAL:
if (pkg_compare_version(pkg->version, pkgdep->version) >= 0)
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return pkg;
break;
case PKG_EQUAL:
if (pkg_compare_version(pkg->version, pkgdep->version) == 0)
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return pkg;
break;
case PKG_NOT_EQUAL:
if (pkg_compare_version(pkg->version, pkgdep->version) != 0)
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return pkg;
break;
case PKG_ANY:
default:
return pkg;
}
if (eflags != NULL)
*eflags |= PKG_ERRF_PACKAGE_VER_MISMATCH;
return pkg;
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}
/*
* pkg_verify_graph(root, depth)
*
* verify the graph dependency nodes are satisfiable by walking the tree using
* pkg_traverse().
*/
unsigned int
pkg_verify_graph(pkg_t *root, int depth, unsigned int flags)
{
return pkg_traverse(root, NULL, NULL, depth, flags);
}
unsigned int
pkg_report_graph_error(pkg_t *pkg, pkg_dependency_t *node, unsigned int eflags)
{
if (eflags & PKG_ERRF_PACKAGE_NOT_FOUND)
{
fprintf(stderr, "Package %s was not found in the pkg-config search path.\n", node->package);
fprintf(stderr, "Perhaps you should add the directory containing `%s.pc'\n", node->package);
fprintf(stderr, "to the PKG_CONFIG_PATH environment variable\n");
fprintf(stderr, "No package '%s' found\n", node->package);
}
else if (eflags & PKG_ERRF_PACKAGE_VER_MISMATCH)
{
fprintf(stderr, "Package dependency requirement '%s %s %s' could not be satisfied.\n",
node->package, pkg_get_comparator(node), node->version);
if (pkg != NULL)
fprintf(stderr, "Package '%s' has version '%s', required version is '%s %s'\n",
node->package, pkg->version, pkg_get_comparator(node), node->version);
}
if (pkg != NULL)
pkg_free(pkg);
return eflags;
}
static inline unsigned int
pkg_walk_list(pkg_dependency_t *deplist,
pkg_traverse_func_t func,
void *data,
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int depth,
unsigned int flags)
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{
unsigned int eflags = PKG_ERRF_OK;
pkg_dependency_t *node;
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PKG_FOREACH_LIST_ENTRY(deplist, node)
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{
pkg_t *pkgdep;
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if (*node->package == '\0')
continue;
pkgdep = pkg_verify_dependency(node, flags, &eflags);
if (eflags != PKG_ERRF_OK)
return pkg_report_graph_error(pkgdep, node, eflags);
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eflags = pkg_traverse(pkgdep, func, data, depth - 1, flags);
pkg_free(pkgdep);
/* optimization: if a break has been found in the depgraph, quit walking it */
if (eflags != PKG_ERRF_OK)
break;
}
return eflags;
}
static inline unsigned int
pkg_walk_conflicts_list(pkg_t *root, pkg_dependency_t *deplist, unsigned int flags)
{
unsigned int eflags;
pkg_dependency_t *node;
PKG_FOREACH_LIST_ENTRY(deplist, node)
{
pkg_t *pkgdep;
if (*node->package == '\0')
continue;
pkgdep = pkg_verify_dependency(node, flags, &eflags);
if (eflags == PKG_ERRF_OK)
{
fprintf(stderr, "Version '%s' of '%s' conflicts with '%s' due to satisfying conflict rule '%s %s%s%s'.\n",
pkgdep->version, pkgdep->realname, root->realname, node->package, pkg_get_comparator(node),
node->version != NULL ? " " : "", node->version != NULL ? node->version : "");
fprintf(stderr, "It may be possible to ignore this conflict and continue, try the\n");
fprintf(stderr, "PKG_CONFIG_IGNORE_CONFLICTS environment variable.\n");
pkg_free(pkgdep);
return PKG_ERRF_PACKAGE_CONFLICT;
}
pkg_free(pkgdep);
}
return PKG_ERRF_OK;
}
/*
* pkg_traverse(root, func, data, maxdepth, flags)
*
* walk the dependency graph up to maxdepth levels. -1 means infinite recursion.
*/
unsigned int
pkg_traverse(pkg_t *root,
pkg_traverse_func_t func,
void *data,
int maxdepth,
unsigned int flags)
{
unsigned int rflags = flags & ~PKGF_SKIP_ROOT_VIRTUAL;
unsigned int eflags = PKG_ERRF_OK;
if (maxdepth == 0)
return eflags;
if (!(flags & PKGF_SKIP_CONFLICTS))
{
eflags = pkg_walk_conflicts_list(root, root->conflicts, rflags);
if (eflags != PKG_ERRF_OK)
return eflags;
}
eflags = pkg_walk_list(root->requires, func, data, maxdepth, rflags);
if (eflags != PKG_ERRF_OK)
return eflags;
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if (flags & PKGF_SEARCH_PRIVATE)
{
eflags = pkg_walk_list(root->requires_private, func, data, maxdepth, rflags);
if (eflags != PKG_ERRF_OK)
return eflags;
}
if ((root->flags & PKG_PROPF_VIRTUAL) && (flags & PKGF_SKIP_ROOT_VIRTUAL))
return eflags;
if (func != NULL)
func(root, data, flags);
return eflags;
}
static void
pkg_cflags_collect(pkg_t *pkg, void *data, unsigned int flags)
{
pkg_fragment_t **list = data;
pkg_fragment_t *frag;
(void) flags;
PKG_FOREACH_LIST_ENTRY(pkg->cflags, frag)
*list = pkg_fragment_copy(*list, frag);
}
pkg_fragment_t *
pkg_cflags(pkg_t *root, int maxdepth, unsigned int flags)
{
pkg_fragment_t *head = NULL;
pkg_traverse(root, pkg_cflags_collect, &head, maxdepth, flags);
return head;
}
static void
pkg_libs_collect(pkg_t *pkg, void *data, unsigned int flags)
{
pkg_fragment_t **list = data;
pkg_fragment_t *frag;
PKG_FOREACH_LIST_ENTRY(pkg->libs, frag)
*list = pkg_fragment_copy(*list, frag);
if (flags & PKGF_MERGE_PRIVATE_FRAGMENTS)
{
PKG_FOREACH_LIST_ENTRY(pkg->libs_private, frag)
*list = pkg_fragment_copy(*list, frag);
}
}
pkg_fragment_t *
pkg_libs(pkg_t *root, int maxdepth, unsigned int flags)
{
pkg_fragment_t *head = NULL;
pkg_traverse(root, pkg_libs_collect, &head, maxdepth, flags);
return head;
}