cutils: introduce get_relocated_path

Add the function that will compute a relocated version of the
directories in CONFIG_QEMU_*DIR and CONFIG_QEMU_*PATH.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2020-08-18 11:55:47 +02:00
parent 9386a4a715
commit f4f5ed2cbd
3 changed files with 75 additions and 2 deletions

View File

@ -184,4 +184,16 @@ int uleb128_decode_small(const uint8_t *in, uint32_t *n);
*/
int qemu_pstrcmp0(const char **str1, const char **str2);
/**
* get_relocated_path:
* @dir: the directory (typically a `CONFIG_*DIR` variable) to be relocated.
*
* Returns a path for @dir that uses the directory of the running executable
* as the prefix. For example, if `bindir` is `/usr/bin` and @dir is
* `/usr/share/qemu`, the function will append `../share/qemu` to the
* directory that contains the running executable and return the result.
*/
char *get_relocated_path(const char *dir);
#endif

View File

@ -560,9 +560,9 @@ config_host_data.set('QEMU_VERSION_MINOR', meson.project_version().split('.')[1]
config_host_data.set('QEMU_VERSION_MICRO', meson.project_version().split('.')[2])
arrays = ['CONFIG_AUDIO_DRIVERS', 'CONFIG_BDRV_RW_WHITELIST', 'CONFIG_BDRV_RO_WHITELIST']
strings = ['HOST_DSOSUF', 'CONFIG_IASL', 'bindir', 'qemu_confdir', 'qemu_datadir',
strings = ['HOST_DSOSUF', 'CONFIG_IASL', 'bindir', 'prefix', 'qemu_confdir', 'qemu_datadir',
'qemu_moddir', 'qemu_localstatedir', 'qemu_helperdir', 'qemu_localedir',
'qemu_icondir', 'qemu_desktopdir', 'qemu_firmwarepath']
'qemu_icondir', 'qemu_desktopdir', 'qemu_firmwarepath', 'sysconfdir']
foreach k, v: config_host
if arrays.contains(k)
if v != ''

View File

@ -889,3 +889,64 @@ int qemu_pstrcmp0(const char **str1, const char **str2)
{
return g_strcmp0(*str1, *str2);
}
static inline bool starts_with_prefix(const char *dir)
{
size_t prefix_len = strlen(CONFIG_PREFIX);
return !memcmp(dir, CONFIG_PREFIX, prefix_len) &&
(!dir[prefix_len] || G_IS_DIR_SEPARATOR(dir[prefix_len]));
}
/* Return the next path component in dir, and store its length in *p_len. */
static inline const char *next_component(const char *dir, int *p_len)
{
int len;
while (*dir && G_IS_DIR_SEPARATOR(*dir)) {
dir++;
}
len = 0;
while (dir[len] && !G_IS_DIR_SEPARATOR(dir[len])) {
len++;
}
*p_len = len;
return dir;
}
char *get_relocated_path(const char *dir)
{
size_t prefix_len = strlen(CONFIG_PREFIX);
const char *bindir = CONFIG_BINDIR;
const char *exec_dir = qemu_get_exec_dir();
GString *result;
int len_dir, len_bindir;
/* Fail if qemu_init_exec_dir was not called. */
assert(exec_dir[0]);
if (!starts_with_prefix(dir) || !starts_with_prefix(bindir)) {
return strdup(dir);
}
result = g_string_new(exec_dir);
/* Advance over common components. */
len_dir = len_bindir = prefix_len;
do {
dir += len_dir;
bindir += len_bindir;
dir = next_component(dir, &len_dir);
bindir = next_component(bindir, &len_bindir);
} while (len_dir == len_bindir && !memcmp(dir, bindir, len_dir));
/* Ascend from bindir to the common prefix with dir. */
while (len_bindir) {
bindir += len_bindir;
g_string_append(result, "/..");
bindir = next_component(bindir, &len_bindir);
}
if (*dir) {
assert(G_IS_DIR_SEPARATOR(dir[-1]));
g_string_append(result, dir - 1);
}
return result->str;
}