pkgconf/pkg.c

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2011-07-25 02:03:17 +00:00
/*
* 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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#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);
}
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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);
}
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pkg_t *
pkg_find(const char *name, unsigned int flags)
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{
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char locbuf[PKG_CONFIG_PATH_SZ];
char uninst_locbuf[PKG_CONFIG_PATH_SZ];
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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);
while (iter < count)
{
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snprintf(locbuf, sizeof locbuf, "%s/%s" PKG_CONFIG_EXT, path[iter], name);
snprintf(uninst_locbuf, sizeof uninst_locbuf, "%s/%s-uninstalled" PKG_CONFIG_EXT, path[iter], name);
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if (!(flags & PKGF_NO_UNINSTALLED) && (f = fopen(uninst_locbuf, "r")) != NULL)
{
pkg = pkg_new_from_file(locbuf, f);
pkg->uninstalled = true;
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goto out;
}
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if ((f = fopen(locbuf, "r")) != NULL)
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{
pkg = pkg_new_from_file(locbuf, f);
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goto out;
}
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iter++;
}
}
env_path = getenv("PKG_CONFIG_LIBDIR");
if (env_path == NULL)
env_path = PKG_DEFAULT_PATH;
if (!(flags & PKGF_ENV_ONLY))
{
count = path_split(env_path, &path);
iter = 0;
while (iter < count)
{
snprintf(locbuf, sizeof locbuf, "%s/%s" PKG_CONFIG_EXT, path[iter], name);
snprintf(uninst_locbuf, sizeof uninst_locbuf, "%s/%s-uninstalled" PKG_CONFIG_EXT, path[iter], name);
if (!(flags & PKGF_NO_UNINSTALLED) && (f = fopen(uninst_locbuf, "r")) != NULL)
{
pkg_t *pkg = pkg_new_from_file(locbuf, f);
pkg->uninstalled = true;
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goto out;
}
if ((f = fopen(locbuf, "r")) != NULL)
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{
pkg = pkg_new_from_file(locbuf, f);
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goto out;
}
iter++;
}
}
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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 *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;
str1 = LOCAL_COPY(a);
str2 = LOCAL_COPY(b);
one = str1;
two = str2;
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,
void (*pkg_traverse_func)(pkg_t *package, void *data),
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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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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pkg_traverse(pkgdep, pkg_traverse_func, data, depth - 1, flags);
pkg_free(pkgdep);
}
return eflags;
}
/*
* pkg_traverse(root, pkg_traverse_func, data, maxdepth)
*
* walk the dependency graph up to maxdepth levels. -1 means infinite recursion.
*/
unsigned int
pkg_traverse(pkg_t *root,
void (*pkg_traverse_func)(pkg_t *package, void *data),
void *data,
int maxdepth,
unsigned int flags)
{
unsigned int eflags = PKG_ERRF_OK;
if (maxdepth == 0)
return eflags;
eflags = pkg_walk_list(root->requires, pkg_traverse_func, data, maxdepth, flags);
if (eflags != PKG_ERRF_OK)
return eflags;
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if (flags & PKGF_SEARCH_PRIVATE)
{
eflags = pkg_walk_list(root->requires_private, pkg_traverse_func, data, maxdepth, flags);
if (eflags != PKG_ERRF_OK)
return eflags;
}
if (pkg_traverse_func != NULL)
pkg_traverse_func(root, data);
return eflags;
}