Merge branch 'jc/merge-reduce-parents-early' into maint

diff --git a/convert.c b/convert.c
index 12868ed7bda11648704ffe4e5d3415067764a6e2..66021550c32f86e662fe5da84c852e80ae790450 100644 (file)
--- a/convert.c
+++ b/convert.c
@@ -2,6 +2,7 @@
 #include "attr.h"
 #include "run-command.h"
 #include "quote.h"
+#include "sigchain.h"
 
 /*
  * convert.c - convert a file when checking it out and checking it in.
@@ -195,9 +196,17 @@ static int crlf_to_git(const char *path, const char *src, size_t len,
        char *dst;
 
        if (crlf_action == CRLF_BINARY ||
-           (crlf_action == CRLF_GUESS && auto_crlf == AUTO_CRLF_FALSE) || !len)
+           (crlf_action == CRLF_GUESS && auto_crlf == AUTO_CRLF_FALSE) ||
+           (src && !len))
                return 0;
 
+       /*
+        * If we are doing a dry-run and have no source buffer, there is
+        * nothing to analyze; we must assume we would convert.
+        */
+       if (!buf && !src)
+               return 1;
+
        gather_stats(src, len, &stats);
 
        if (crlf_action == CRLF_AUTO || crlf_action == CRLF_GUESS) {
@@ -231,6 +240,13 @@ static int crlf_to_git(const char *path, const char *src, size_t len,
        if (!stats.cr)
                return 0;
 
+       /*
+        * At this point all of our source analysis is done, and we are sure we
+        * would convert. If we are in dry-run mode, we can give an answer.
+        */
+       if (!buf)
+               return 1;
+
        /* only grow if not in place */
        if (strbuf_avail(buf) + buf->len < len)
                strbuf_grow(buf, len - buf->len);
@@ -360,12 +376,16 @@ static int filter_buffer(int in, int out, void *data)
        if (start_command(&child_process))
                return error("cannot fork to run external filter %s", params->cmd);
 
+       sigchain_push(SIGPIPE, SIG_IGN);
+
        write_err = (write_in_full(child_process.in, params->src, params->size) < 0);
        if (close(child_process.in))
                write_err = 1;
        if (write_err)
                error("cannot feed the input to external filter %s", params->cmd);
 
+       sigchain_pop(SIGPIPE);
+
        status = finish_command(&child_process);
        if (status)
                error("external filter %s failed %d", params->cmd, status);
@@ -391,6 +411,9 @@ static int apply_filter(const char *path, const char *src, size_t len,
        if (!cmd)
                return 0;
 
+       if (!dst)
+               return 1;
+
        memset(&async, 0, sizeof(async));
        async.proc = filter_buffer;
        async.data = &params;
@@ -429,6 +452,7 @@ static struct convert_driver {
        struct convert_driver *next;
        const char *smudge;
        const char *clean;
+       int required;
 } *user_convert, **user_convert_tail;
 
 static int read_convert_config(const char *var, const char *value, void *cb)
@@ -472,6 +496,11 @@ static int read_convert_config(const char *var, const char *value, void *cb)
        if (!strcmp("clean", ep))
                return git_config_string(&drv->clean, var, value);
 
+       if (!strcmp("required", ep)) {
+               drv->required = git_config_bool(var, value);
+               return 0;
+       }
+
        return 0;
 }
 
@@ -522,9 +551,12 @@ static int ident_to_git(const char *path, const char *src, size_t len,
 {
        char *dst, *dollar;
 
-       if (!ident || !count_ident(src, len))
+       if (!ident || (src && !count_ident(src, len)))
                return 0;
 
+       if (!buf)
+               return 1;
+
        /* only grow if not in place */
        if (strbuf_avail(buf) + buf->len < len)
                strbuf_grow(buf, len - buf->len);
@@ -747,20 +779,26 @@ int convert_to_git(const char *path, const char *src, size_t len,
 {
        int ret = 0;
        const char *filter = NULL;
+       int required = 0;
        struct conv_attrs ca;
 
        convert_attrs(&ca, path);
-       if (ca.drv)
+       if (ca.drv) {
                filter = ca.drv->clean;
+               required = ca.drv->required;
+       }
 
        ret |= apply_filter(path, src, len, dst, filter);
-       if (ret) {
+       if (!ret && required)
+               die("%s: clean filter '%s' failed", path, ca.drv->name);
+
+       if (ret && dst) {
                src = dst->buf;
                len = dst->len;
        }
        ca.crlf_action = input_crlf_action(ca.crlf_action, ca.eol_attr);
        ret |= crlf_to_git(path, src, len, dst, ca.crlf_action, checksafe);
-       if (ret) {
+       if (ret && dst) {
                src = dst->buf;
                len = dst->len;
        }
@@ -771,13 +809,16 @@ static int convert_to_working_tree_internal(const char *path, const char *src,
                                            size_t len, struct strbuf *dst,
                                            int normalizing)
 {
-       int ret = 0;
+       int ret = 0, ret_filter = 0;
        const char *filter = NULL;
+       int required = 0;
        struct conv_attrs ca;
 
        convert_attrs(&ca, path);
-       if (ca.drv)
+       if (ca.drv) {
                filter = ca.drv->smudge;
+               required = ca.drv->required;
+       }
 
        ret |= ident_to_worktree(path, src, len, dst, ca.ident);
        if (ret) {
@@ -796,7 +837,12 @@ static int convert_to_working_tree_internal(const char *path, const char *src,
                        len = dst->len;
                }
        }
-       return ret | apply_filter(path, src, len, dst, filter);
+
+       ret_filter = apply_filter(path, src, len, dst, filter);
+       if (!ret_filter && required)
+               die("%s: smudge filter %s failed", path, ca.drv->name);
+
+       return ret | ret_filter;
 }
 
 int convert_to_working_tree(const char *path, const char *src, size_t len, struct strbuf *dst)