[libvirt PATCH 1/4] util: add an API to retrieve the resolved path to a virCommand's binary
The binary to be exec'ed by virExec() is stored in
virCommand::args[0], and is resolved to a full absolute path (stored
in a local of virExec() just prior to execve().
Since we will have another use for the full absolute path, lets make
an API to resolve/retrieve the absolute path, and cache it in
virCommand::binaryPath so we only have to do the resolution once.
Signed-off-by: Laine Stump <laine(a)redhat.com>
---
src/libvirt_private.syms | 1 +
src/util/vircommand.c | 51 +++++++++++++++++++++++++++++++---------
src/util/vircommand.h | 1 +
3 files changed, 42 insertions(+), 11 deletions(-)
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 4959dcec67..6f44788233 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -2091,6 +2091,7 @@ virCommandDryRunTokenNew;
virCommandExec;
virCommandFree;
virCommandGetArgList;
+virCommandGetBinaryPath;
virCommandGetGID;
virCommandGetUID;
virCommandHandshakeNotify;
diff --git a/src/util/vircommand.c b/src/util/vircommand.c
index 1144dfb597..757d462ba1 100644
--- a/src/util/vircommand.c
+++ b/src/util/vircommand.c
@@ -88,6 +88,7 @@ struct _virCommandSendBuffer {
struct _virCommand {
int has_error; /* 0 on success, -1 on error */
+ char *binaryPath; /* only valid if args[0] isn't absolute path */
char **args;
size_t nargs;
size_t maxargs;
@@ -630,6 +631,7 @@ virCommandMassClose(virCommand *cmd,
# endif /* ! __FreeBSD__ */
+
/*
* virExec:
* @cmd virCommand * containing all information about the program to
@@ -646,22 +648,13 @@ virExec(virCommand *cmd)
int childin = cmd->infd;
int childout = -1;
int childerr = -1;
- g_autofree char *binarystr = NULL;
const char *binary = NULL;
int ret;
g_autofree gid_t *groups = NULL;
int ngroups;
- if (!g_path_is_absolute(cmd->args[0])) {
- if (!(binary = binarystr = virFindFileInPath(cmd->args[0]))) {
- virReportSystemError(ENOENT,
- _("Cannot find '%s' in path"),
- cmd->args[0]);
- return -1;
- }
- } else {
- binary = cmd->args[0];
- }
+ if (!(binary = virCommandGetBinaryPath(cmd)))
+ return -1;
if (childin < 0) {
if (getDevNull(&null) < 0)
@@ -2164,6 +2157,40 @@ virCommandGetArgList(virCommand *cmd,
}
+/*
+ * virCommandGetBinaryPath:
+ * @cmd: virCommand* containing all information about the program
+ *
+ * If args[0] is an absolute path, return that. If not, then resolve
+ * args[0] to a full absolute path, cache that in binaryPath, and
+ * return a pointer to this resolved string. binaryPath is only set by
+ * calling this function, so even other virCommand functions should
+ * access binaryPath via this function.
+ *
+ * returns const char* with the full path of the binary to be
+ * executed, or NULL on failure.
+ */
+const char *
+virCommandGetBinaryPath(virCommand *cmd)
+{
+
+ if (cmd->binaryPath)
+ return cmd->binaryPath;
+
+ if (g_path_is_absolute(cmd->args[0]))
+ return cmd->args[0];
+
+ if (!(cmd->binaryPath = virFindFileInPath(cmd->args[0]))) {
+ virReportSystemError(ENOENT,
+ _("Cannot find '%s' in path"),
+ cmd->args[0]);
+ return NULL;
+ }
+
+ return cmd->binaryPath;
+}
+
+
#ifndef WIN32
/*
* Manage input and output to the child process.
@@ -3015,6 +3042,8 @@ virCommandFree(virCommand *cmd)
VIR_FORCE_CLOSE(cmd->outfd);
VIR_FORCE_CLOSE(cmd->errfd);
+ g_free(cmd->binaryPath);
+
for (i = 0; i < cmd->nargs; i++)
g_free(cmd->args[i]);
g_free(cmd->args);
diff --git a/src/util/vircommand.h b/src/util/vircommand.h
index e0002103b6..d51449ac90 100644
--- a/src/util/vircommand.h
+++ b/src/util/vircommand.h
@@ -170,6 +170,7 @@ int virCommandToStringBuf(virCommand *cmd,
bool linebreaks,
bool stripCommandPath);
+const char *virCommandGetBinaryPath(virCommand *cmd);
int virCommandGetArgList(virCommand *cmd, char ***args);
int virCommandExec(virCommand *cmd, gid_t *groups, int ngroups)
G_GNUC_WARN_UNUSED_RESULT;
--
2.39.2