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b1bf95bba2
Just before updating a ref,
$GIT_DIR/hooks/update refname old-sha1 new-sha1
is called if executable. The hook can decline the ref to be
updated by exiting with a non-zero status, or allow it to be
updated by exiting with a zero status. The mechanism also
allows e.g sending of a mail with pushed commits on the remote
repository.
Documentation update with an example hook is included.
jc: The credits of the basic idea and initial implementation go
to Josef, but I ended up rewriting major parts of his patch, so
bugs are all mine. Also I changed the semantics for the hook
from his original version (which were post-update hook) so that
the hook can optionally decline to update the ref, and also can
be used to implement the overall cleanups. The latter was
primarily to implement a suggestion from Linus that calling
update-server-info should be made optional.
Signed-off-by: Junio C Hamano <junkio@cox.net>
61 lines
1.3 KiB
C
61 lines
1.3 KiB
C
#include "cache.h"
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#include "run-command.h"
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#include <sys/wait.h>
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static int run_external_command(int argc, const char **argv)
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{
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pid_t pid = fork();
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if (pid < 0)
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return -ERR_RUN_COMMAND_FORK;
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if (!pid) {
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execvp(argv[0], (char *const*) argv);
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return -ERR_RUN_COMMAND_EXEC;
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}
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for (;;) {
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int status, code;
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int retval = waitpid(pid, &status, 0);
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if (retval < 0) {
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if (errno == EINTR)
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continue;
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error("waitpid failed (%s)", strerror(retval));
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return -ERR_RUN_COMMAND_WAITPID;
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}
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if (retval != pid)
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return -ERR_RUN_COMMAND_WAITPID_WRONG_PID;
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if (WIFSIGNALED(status))
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return -ERR_RUN_COMMAND_WAITPID_SIGNAL;
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if (!WIFEXITED(status))
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return -ERR_RUN_COMMAND_WAITPID_NOEXIT;
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code = WEXITSTATUS(status);
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if (code)
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return -code;
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return 0;
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}
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}
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int run_command(const char *cmd, ...)
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{
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int argc;
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const char *argv[MAX_RUN_COMMAND_ARGS];
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const char *arg;
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va_list param;
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fprintf(stderr, "run-command %s (%d)\n", cmd, ERR_RUN_COMMAND_EXEC);
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va_start(param, cmd);
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argv[0] = cmd;
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argc = 1;
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while (argc < MAX_RUN_COMMAND_ARGS) {
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arg = argv[argc++] = va_arg(param, char *);
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if (!arg)
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break;
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}
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va_end(param);
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if (MAX_RUN_COMMAND_ARGS <= argc)
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return error("too many args to run %s", cmd);
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return run_external_command(argc, argv);
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}
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