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cutils: Introduce bundle mechanism

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Developers often run QEMU without installing. The bundle mechanism
allows to look up files which should be present in installation even in
such a situation.

It is a general mechanism and can find any files in the installation
tree. The build tree will have a new directory, qemu-bundle, to
represent what files the installation tree would have for reference by
the executables.

Note that it abandons compatibility with Windows older than 8. The
extended support for the prior version, 7 ended more than 2 years ago,
and it is unlikely that someone would like to run the latest QEMU on
such an old system.

Signed-off-by: Akihiko Odaki <akihiko.odaki@gmail.com>
Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20220624145039.49929-3-akihiko.odaki@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Akihiko Odaki 2022-06-24 23:50:37 +09:00 • committed by Paolo Bonzini
parent 4367a20cc4
commit cf60ccc330
7 changed files with 101 additions and 25 deletions
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66
util/cutils.c
View file

@ -35,6 +35,11 @@
#include <sys/sysctl.h>
#endif
#ifdef G_OS_WIN32
#include <pathcch.h>
#include <wchar.h>
#endif
#include "qemu/ctype.h"
#include "qemu/cutils.h"
#include "qemu/error-report.h"
@ -1074,31 +1079,52 @@ char *get_relocated_path(const char *dir)
/* Fail if qemu_init_exec_dir was not called. */
assert(exec_dir[0]);
if (!starts_with_prefix(dir) || !starts_with_prefix(bindir)) {
return g_strdup(dir);
}
result = g_string_new(exec_dir);
g_string_append(result, "/qemu-bundle");
if (access(result->str, R_OK) == 0) {
#ifdef G_OS_WIN32
size_t size = mbsrtowcs(NULL, &dir, 0, &(mbstate_t){0}) + 1;
PWSTR wdir = g_new(WCHAR, size);
mbsrtowcs(wdir, &dir, size, &(mbstate_t){0});
/* 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_dir == len_bindir && !memcmp(dir, bindir, len_dir));
PCWSTR wdir_skipped_root;
PathCchSkipRoot(wdir, &wdir_skipped_root);
/* 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);
size = wcsrtombs(NULL, &wdir_skipped_root, 0, &(mbstate_t){0});
char *cursor = result->str + result->len;
g_string_set_size(result, result->len + size);
wcsrtombs(cursor, &wdir_skipped_root, size + 1, &(mbstate_t){0});
g_free(wdir);
#else
g_string_append(result, dir);
#endif
} else if (!starts_with_prefix(dir) || !starts_with_prefix(bindir)) {
g_string_assign(result, dir);
} else {
g_string_assign(result, 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_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);
}
}
if (*dir) {
assert(G_IS_DIR_SEPARATOR(dir[-1]));
g_string_append(result, dir - 1);
}
return g_string_free(result, false);
}