The idea here is that if XferLockCommand is set, XferCommand can be non-blocking; all invocations of XferCommand are executed and only then XferLockCommand is executed to wait for all the downloads to complete. I am also thinking of changing XferLockCommand to XferWaitCommand, if you have better names please let me know. I will fix and resubmit. BTW i noticed that master fails some check, is it safe to be used for testing (in a virtual machine) or should i use a specific commit? Il giorno mar 20 ott 2020 alle ore 04:01 Eli Schwartz ha scritto:

On 10/19/20 7:19 PM, lesto wrote:

...

Signed-off-by: lesto --- lib/libalpm/alpm.h | 10 ++++++++++ lib/libalpm/dload.c | 9 +++++++++ lib/libalpm/handle.c | 13 +++++++++++++ lib/libalpm/handle.h | 1 + src/pacman/conf.c | 5 ++++- src/pacman/conf.h | 1 + src/pacman/pacman-conf.c | 3 +++ 7 files changed, 41 insertions(+), 1 deletion(-)

Your patch never even reads the XferLockCommand key to store its value in "config". It's not clear what this is intended to do or how it functions. Trivial check: try adding "XferLockCommand" to /etc/pacman.conf

warning: config file /etc/pacman.conf, line 22: directive 'XferLockCommand' in section 'options' not recognized.

Please fix this, and include an update to doc/pacman.conf.5.asciidoc describing the new key and how to use it.

...

diff --git a/lib/libalpm/alpm.h b/lib/libalpm/alpm.h index 614a530c..c2af60e8 100644 --- a/lib/libalpm/alpm.h +++ b/lib/libalpm/alpm.h @@ -755,6 +755,11 @@ typedef void (*alpm_cb_totaldl)(off_t total); typedef int (*alpm_cb_fetch)(const char *url, const char *localpath, int force);

+/** A callback for waiting for download of files + * @return 0 on success, -1 on error. + */ +typedef int (*alpm_cb_fetch_lock)(void); + /** Fetch a list of remote packages. * @param handle the context handle * @param urls list of package URLs to download @@ -787,6 +792,11 @@ alpm_cb_fetch alpm_option_get_fetchcb(alpm_handle_t *handle); /** Sets the downloading callback. */ int alpm_option_set_fetchcb(alpm_handle_t *handle, alpm_cb_fetch cb);

+/** Returns the downloading lock callback. */ +alpm_cb_fetch_lock alpm_option_get_fetch_lockcb(alpm_handle_t *handle); +/** Sets the downloading lock callback. */ +int alpm_option_set_fetch_lockcb(alpm_handle_t *handle, alpm_cb_fetch_lock cb); + /** Returns the callback used to report total download size. */ alpm_cb_totaldl alpm_option_get_totaldlcb(alpm_handle_t *handle); /** Sets the callback used to report total download size. */ diff --git a/lib/libalpm/dload.c b/lib/libalpm/dload.c index 673e769f..174d559d 100644 --- a/lib/libalpm/dload.c +++ b/lib/libalpm/dload.c @@ -824,6 +824,15 @@ int _alpm_download(alpm_handle_t *handle, RET_ERR(handle, ALPM_ERR_EXTERNAL_DOWNLOAD, -1); } } + + if (handle->fetch_lockcb != NULL) { + // if fetch_lockcb is set, fetchcb is non-blocking; here we wait for all download to complete + int ret = handle->fetch_lockcb(); + if (ret == -1) { + RET_ERR(handle, ALPM_ERR_EXTERNAL_DOWNLOAD, -1); + } + } + return 0; } } diff --git a/lib/libalpm/handle.c b/lib/libalpm/handle.c index 1310601a..683e678d 100644 --- a/lib/libalpm/handle.c +++ b/lib/libalpm/handle.c @@ -174,6 +174,12 @@ alpm_cb_fetch SYMEXPORT alpm_option_get_fetchcb(alpm_handle_t *handle) return handle->fetchcb; }

+alpm_cb_fetch_lock SYMEXPORT alpm_option_get_fetch_lockcb(alpm_handle_t *handle) +{ + CHECK_HANDLE(handle, return NULL); + return handle->fetch_lockcb; +} + alpm_cb_totaldl SYMEXPORT alpm_option_get_totaldlcb(alpm_handle_t *handle) { CHECK_HANDLE(handle, return NULL); @@ -321,6 +327,13 @@ int SYMEXPORT alpm_option_set_fetchcb(alpm_handle_t *handle, alpm_cb_fetch cb) return 0; }

+int SYMEXPORT alpm_option_set_fetch_lockcb(alpm_handle_t *handle, alpm_cb_fetch_lock cb) +{ + CHECK_HANDLE(handle, return -1); + handle->fetch_lockcb = cb; + return 0; +} + int SYMEXPORT alpm_option_set_totaldlcb(alpm_handle_t *handle, alpm_cb_totaldl cb) { CHECK_HANDLE(handle, return -1); diff --git a/lib/libalpm/handle.h b/lib/libalpm/handle.h index 9fef0fbf..dc00751b 100644 --- a/lib/libalpm/handle.h +++ b/lib/libalpm/handle.h @@ -73,6 +73,7 @@ struct __alpm_handle_t { alpm_cb_download dlcb; /* Download callback function */ alpm_cb_totaldl totaldlcb; /* Total download callback function */ alpm_cb_fetch fetchcb; /* Download file callback function */ + alpm_cb_fetch_lock fetch_lockcb; /* Download lock file callback function */ alpm_cb_event eventcb; alpm_cb_question questioncb; alpm_cb_progress progresscb; diff --git a/src/pacman/conf.c b/src/pacman/conf.c index 3a3ef605..53de73b8 100644 --- a/src/pacman/conf.c +++ b/src/pacman/conf.c @@ -157,6 +157,7 @@ int config_free(config_t *oldconfig) FREELIST(oldconfig->hookdirs); FREELIST(oldconfig->cachedirs); free(oldconfig->xfercommand); + free(oldconfig->xferlockcommand); free(oldconfig->print_format); free(oldconfig->arch); wordsplit_free(oldconfig->xfercommand_argv); @@ -319,7 +320,9 @@ static int download_with_xfercommand(const char *url, const char *localpath, for(i = 0; i <= config->xfercommand_argc; i++) { const char *val = config->xfercommand_argv[i]; if(val && strcmp(val, "%o") == 0) { - usepart = 1; + if (config->xferlockcommand == NULL) { + usepart = 1; + } val = tempfile; } else if(val && strcmp(val, "%u") == 0) { val = url; diff --git a/src/pacman/conf.h b/src/pacman/conf.h index b8a451ad..1a9d637d 100644 --- a/src/pacman/conf.h +++ b/src/pacman/conf.h @@ -130,6 +130,7 @@ typedef struct __config_t { char *xfercommand; char **xfercommand_argv; size_t xfercommand_argc; + char *xferlockcommand;

/* our connection to libalpm */ alpm_handle_t *handle; diff --git a/src/pacman/pacman-conf.c b/src/pacman/pacman-conf.c index 463badf1..7c4f4cc9 100644 --- a/src/pacman/pacman-conf.c +++ b/src/pacman/pacman-conf.c @@ -259,6 +259,7 @@ static void dump_config(void)

show_str("Architecture", config->arch); show_str("XferCommand", config->xfercommand); + show_str("XferLockCommand", config->xferlockcommand);

show_bool("UseSyslog", config->usesyslog); show_bool("Color", config->color); @@ -366,6 +367,8 @@ static int list_directives(void) show_str("Architecture", config->arch); } else if(strcasecmp(i->data, "XferCommand") == 0) { show_str("XferCommand", config->xfercommand); + } else if(strcasecmp(i->data, "XferLockCommand") == 0) { + show_str("XferLockCommand", config->xferlockcommand);

} else if(strcasecmp(i->data, "UseSyslog") == 0) { show_bool("UseSyslog", config->usesyslog);

-- Eli Schwartz Bug Wrangler and Trusted User