I am working on a project that required parsing through regular mboxes that
didn't necessarily have patches embedded in them. I started by creating my
own modified copy of git-am and working from there. Very quickly, I noticed
git-mailinfo wasn't able to handle a big chunk of my email.
After hacking up numerous solutions and running into more limitations, I
decided it was just easier to rewrite a big chunk of it. The following
patch has a bunch of fixes and features that I needed in order for me do
what I wanted.
Note: I'm didn't follow any email rfc papers but I don't think any of the
changes I did required much knowledge (besides the boundary stuff).
List of major changes/fixes:
- can't create empty patch files fix
- empty patch files don't fail, this failure will come inside git-am
- multipart boundaries are now handled
- only output inbody headers if a patch exists otherwise assume those
headers are part of the reply and instead output the original headers
- decode and filter base64 patches correctly
- various other accidental fixes
I believe I didn't break any existing functionality or compatibility (other
than what I describe above, which is really only the empty patch file).
I tested this through various mailing list archives and everything seemed to
parse correctly (a couple thousand emails).
Signed-off-by: Don Zickus <dzickus@xxxxxxxxxx>
---
builtin-mailinfo.c | 520 +++++++++++++++++++++++++++------------------------
git-am.sh | 4 +
git-applymbox.sh | 4 +
git-quiltimport.sh | 4 +
4 files changed, 287 insertions(+), 245 deletions(-)
diff --git a/builtin-mailinfo.c b/builtin-mailinfo.c
index 766a37e..dacdf77 100644
--- a/builtin-mailinfo.c
+++ b/builtin-mailinfo.c
@@ -11,19 +11,22 @@ static FILE *cmitmsg, *patchfile, *fin, *fout;
static int keep_subject;
static const char *metainfo_charset;
static char line[1000];
-static char date[1000];
static char name[1000];
static char email[1000];
-static char subject[1000];
static enum {
TE_DONTCARE, TE_QP, TE_BASE64,
} transfer_encoding;
-static char charset[256];
+static enum {
+ TYPE_TEXT, TYPE_OTHER,
+} message_type;
-static char multipart_boundary[1000];
-static int multipart_boundary_len;
+static char charset[256];
static int patch_lines;
+static char **p_hdr_data, **s_hdr_data;
+
+#define MAX_HDR_PARSED 10
+#define MAX_BOUNDARIES 5
static char *sanity_check(char *name, char *email)
{
@@ -137,15 +140,13 @@ static int handle_from(char *in_line)
return 1;
}
-static int handle_date(char *line)
+static int handle_header(char *line, char *data, int ofs)
{
- strcpy(date, line);
- return 0;
-}
+ if (!line || !data)
+ return 1;
+
+ strcpy(data, line+ofs);
-static int handle_subject(char *line)
-{
- strcpy(subject, line);
return 0;
}
@@ -177,17 +178,35 @@ static int slurp_attr(const char *line, const char *name, char *attr)
return 1;
}
-static int handle_subcontent_type(char *line)
+struct content_type {
+ char *boundary;
+ int boundary_len;
+};
+
+static struct content_type content[MAX_BOUNDARIES];
+
+static struct content_type *content_top = content;
+
+static int handle_content_type(char *line)
{
- /* We do not want to mess with boundary. Note that we do not
- * handle nested multipart.
+ char boundary[256];
+
+ /* the only time this return less than zero is when
+ /line/ does not contain "text/"
*/
- if (strcasestr(line, "boundary=")) {
- fprintf(stderr, "Not handling nested multipart message.\n");
- exit(1);
+ if (strcasestr(line, "text/") == NULL)
+ message_type = TYPE_OTHER;
+ if (slurp_attr(line, "boundary=", boundary + 2)) {
+ memcpy(boundary, "--", 2);
+ if (content_top++ >= &content[MAX_BOUNDARIES]) {
+ fprintf(stderr, "Too many boundaries to handle\n");
+ exit(1);
+ }
+ content_top->boundary_len = strlen(boundary);
+ content_top->boundary = xmalloc(content_top->boundary_len+1);
+ strcpy(content_top->boundary, boundary);
}
- slurp_attr(line, "charset=", charset);
- if (*charset) {
+ if (slurp_attr(line, "charset=", charset)) {
int i, c;
for (i = 0; (c = charset[i]) != 0; i++)
charset[i] = tolower(c);
@@ -195,17 +214,6 @@ static int handle_subcontent_type(char *line)
return 0;
}
-static int handle_content_type(char *line)
-{
- *multipart_boundary = 0;
- if (slurp_attr(line, "boundary=", multipart_boundary + 2)) {
- memcpy(multipart_boundary, "--", 2);
- multipart_boundary_len = strlen(multipart_boundary);
- }
- slurp_attr(line, "charset=", charset);
- return 0;
-}
-
static int handle_content_transfer_encoding(char *line)
{
if (strcasestr(line, "base64"))
@@ -219,7 +227,7 @@ static int handle_content_transfer_encoding(char *line)
static int is_multipart_boundary(const char *line)
{
- return (!memcmp(line, multipart_boundary, multipart_boundary_len));
+ return (!memcmp(line, content_top->boundary, content_top->boundary_len));
}
static int eatspace(char *line)
@@ -230,62 +238,6 @@ static int eatspace(char *line)
return len;
}
-#define SEEN_FROM 01
-#define SEEN_DATE 02
-#define SEEN_SUBJECT 04
-#define SEEN_BOGUS_UNIX_FROM 010
-#define SEEN_PREFIX 020
-
-/* First lines of body can have From:, Date:, and Subject: or empty */
-static void handle_inbody_header(int *seen, char *line)
-{
- if (*seen & SEEN_PREFIX)
- return;
- if (isspace(*line)) {
- char *cp;
- for (cp = line + 1; *cp; cp++) {
- if (!isspace(*cp))
- break;
- }
- if (!*cp)
- return;
- }
- if (!memcmp(">From", line, 5) && isspace(line[5])) {
- if (!(*seen & SEEN_BOGUS_UNIX_FROM)) {
- *seen |= SEEN_BOGUS_UNIX_FROM;
- return;
- }
- }
- if (!memcmp("From:", line, 5) && isspace(line[5])) {
- if (!(*seen & SEEN_FROM) && handle_from(line+6)) {
- *seen |= SEEN_FROM;
- return;
- }
- }
- if (!memcmp("Date:", line, 5) && isspace(line[5])) {
- if (!(*seen & SEEN_DATE)) {
- handle_date(line+6);
- *seen |= SEEN_DATE;
- return;
- }
- }
- if (!memcmp("Subject:", line, 8) && isspace(line[8])) {
- if (!(*seen & SEEN_SUBJECT)) {
- handle_subject(line+9);
- *seen |= SEEN_SUBJECT;
- return;
- }
- }
- if (!memcmp("[PATCH]", line, 7) && isspace(line[7])) {
- if (!(*seen & SEEN_SUBJECT)) {
- handle_subject(line);
- *seen |= SEEN_SUBJECT;
- return;
- }
- }
- *seen |= SEEN_PREFIX;
-}
-
static char *cleanup_subject(char *subject)
{
if (keep_subject)
@@ -341,57 +293,62 @@ static void cleanup_space(char *buf)
}
static void decode_header(char *it);
-typedef int (*header_fn_t)(char *);
-struct header_def {
- const char *name;
- header_fn_t func;
- int namelen;
+static char *header[MAX_HDR_PARSED] = {
+ "From","Subject","Date",
};
-static void check_header(char *line, struct header_def *header)
+static int check_header(char *line, char **hdr_data)
{
int i;
- if (header[0].namelen <= 0) {
- for (i = 0; header[i].name; i++)
- header[i].namelen = strlen(header[i].name);
- }
- for (i = 0; header[i].name; i++) {
- int len = header[i].namelen;
- if (!strncasecmp(line, header[i].name, len) &&
+ /* search for the interesting parts */
+ for (i = 0; header[i]; i++) {
+ int len = strlen(header[i]);
+ if (!hdr_data[i] &&
+ !strncasecmp(line, header[i], len) &&
line[len] == ':' && isspace(line[len + 1])) {
/* Unwrap inline B and Q encoding, and optionally
* normalize the meta information to utf8.
*/
decode_header(line + len + 2);
- header[i].func(line + len + 2);
- break;
+ hdr_data[i] = xmalloc(1000 * sizeof(char));
+ if (! handle_header(line, hdr_data[i], len + 2)) {
+ return 1;
+ }
}
}
-}
-static void check_subheader_line(char *line)
-{
- static struct header_def header[] = {
- { "Content-Type", handle_subcontent_type },
- { "Content-Transfer-Encoding",
- handle_content_transfer_encoding },
- { NULL },
- };
- check_header(line, header);
-}
-static void check_header_line(char *line)
-{
- static struct header_def header[] = {
- { "From", handle_from },
- { "Date", handle_date },
- { "Subject", handle_subject },
- { "Content-Type", handle_content_type },
- { "Content-Transfer-Encoding",
- handle_content_transfer_encoding },
- { NULL },
- };
- check_header(line, header);
+ /* Content stuff */
+ if (!strncasecmp(line, "Content-Type", 12) &&
+ line[12] == ':' && isspace(line[12 + 1])) {
+ decode_header(line + 12 + 2);
+ if (! handle_content_type(line)) {
+ return 1;
+ }
+ }
+ if (!strncasecmp(line, "Content-Transfer-Encoding", 25) &&
+ line[25] == ':' && isspace(line[25 + 1])) {
+ decode_header(line + 25 + 2);
+ if (! handle_content_transfer_encoding(line)) {
+ return 1;
+ }
+ }
+
+ /* for inbody stuff */
+ if (!memcmp(">From", line, 5) && isspace(line[5]))
+ return 1;
+ if (!memcmp("[PATCH]", line, 7) && isspace(line[7])) {
+ for (i=0; header[i]; i++) {
+ if (!memcmp("Subject: ", header[i], 9)) {
+ if (! handle_header(line, hdr_data[i], 0)) {
+ return 1;
+ }
+ }
+ }
+ }
+
+ /* no match */
+ return 0;
}
static int is_rfc2822_header(char *line)
@@ -647,147 +604,222 @@ static void decode_transfer_encoding(char *line)
}
}
-static void handle_info(void)
+static int handle_filter(char *line);
+
+static int find_boundary(void)
{
- char *sub;
+ while(fgets(line, sizeof(line), fin) != NULL) {
+ if (is_multipart_boundary(line))
+ return 1;
+ }
+ return 0;
+}
+
+static int handle_boundary(void)
+{
+again:
+ if (!memcmp(line+content_top->boundary_len, "--", 2)) {
+ /* we hit an end boundary */
+ /* pop the current boundary off the stack */
+ free(content_top->boundary);
+
+ /* technically won't happen as is_multipart_boundary()
+ will fail first. But just in case..
+ */
+ if (content_top-- < content) {
+ fprintf(stderr, "Detected mismatched boundaries, "
+ "can't recover\n");
+ exit(1);
+ }
+ handle_filter("\n");
+
+ /* skip to the next boundary */
+ if (!find_boundary())
+ return 0;
+ goto again;
+ }
- sub = cleanup_subject(subject);
- cleanup_space(name);
- cleanup_space(date);
- cleanup_space(email);
- cleanup_space(sub);
+ /* set some defaults */
+ transfer_encoding = TE_DONTCARE;
+ charset[0] = 0;
+ message_type = TYPE_TEXT;
- fprintf(fout, "Author: %s\nEmail: %s\nSubject: %s\nDate: %s\n\n",
- name, email, sub, date);
+ /* slurp in this section's info */
+ while (read_one_header_line(line, sizeof(line), fin))
+ check_header(line, p_hdr_data);
+
+ /* eat the blank line after section info */
+ return (fgets(line, sizeof(line), fin) != NULL);
}
-/* We are inside message body and have read line[] already.
- * Spit out the commit log.
- */
-static int handle_commit_msg(int *seen)
+static int handle_commit_msg(char *line)
{
+ static int still_looking=1;
+
if (!cmitmsg)
return 0;
- do {
- if (!memcmp("diff -", line, 6) ||
- !memcmp("---", line, 3) ||
- !memcmp("Index: ", line, 7))
- break;
- if ((multipart_boundary[0] && is_multipart_boundary(line))) {
- /* We come here when the first part had only
- * the commit message without any patch. We
- * pretend we have not seen this line yet, and
- * go back to the loop.
- */
- return 1;
- }
- /* Unwrap transfer encoding and optionally
- * normalize the log message to UTF-8.
- */
- decode_transfer_encoding(line);
- if (metainfo_charset)
- convert_to_utf8(line, charset);
+ if (still_looking) {
+ char *cp=line;
+ if (isspace(*line)) {
+ for (cp = line + 1; *cp; cp++) {
+ if (!isspace(*cp))
+ break;
+ }
+ if (!*cp)
+ return 0;
+ }
+ if ((still_looking = check_header(cp, s_hdr_data)) != 0)
+ return 0;
+ }
- handle_inbody_header(seen, line);
- if (!(*seen & SEEN_PREFIX))
- continue;
+ if (!memcmp("diff -", line, 6) ||
+ !memcmp("---", line, 3) ||
+ !memcmp("Index: ", line, 7)) {
+ fclose(cmitmsg);
+ cmitmsg = NULL;
+ return 1;
+ }
- fputs(line, cmitmsg);
- } while (fgets(line, sizeof(line), fin) != NULL);
- fclose(cmitmsg);
- cmitmsg = NULL;
+ fputs(line, cmitmsg);
return 0;
}
-/* We have done the commit message and have the first
- * line of the patch in line[].
- */
-static void handle_patch(void)
+static int handle_patch(char *line)
{
- do {
- if (multipart_boundary[0] && is_multipart_boundary(line))
- break;
- /* Only unwrap transfer encoding but otherwise do not
- * do anything. We do *NOT* want UTF-8 conversion
- * here; we are dealing with the user payload.
- */
- decode_transfer_encoding(line);
- fputs(line, patchfile);
- patch_lines++;
- } while (fgets(line, sizeof(line), fin) != NULL);
+ fputs(line, patchfile);
+ patch_lines++;
+ return 0;
}
-/* multipart boundary and transfer encoding are set up for us, and we
- * are at the end of the sub header. do equivalent of handle_body up
- * to the next boundary without closing patchfile --- we will expect
- * that the first part to contain commit message and a patch, and
- * handle other parts as pure patches.
- */
-static int handle_multipart_one_part(int *seen)
+static int handle_filter(char *line)
{
- int n = 0;
+ static int filter=0;
- while (fgets(line, sizeof(line), fin) != NULL) {
- again:
- n++;
- if (is_multipart_boundary(line))
+ /* filter tells us which part we left off on
+ * a non-zero return indicates we hit a filter point
+ */
+ switch (filter) {
+ case 0:
+ if (!handle_commit_msg(line))
break;
- if (handle_commit_msg(seen))
- goto again;
- handle_patch();
- break;
+ filter++;
+ case 1:
+ if (!handle_patch(line))
+ break;
+ filter++;
+ default:
+ return 1;
}
- if (n == 0)
- return -1;
+
return 0;
}
-static void handle_multipart_body(void)
+static void handle_body(void)
{
- int seen = 0;
- int part_num = 0;
+ int rc=0;
+ static char newline[2000];
+ static char *np=newline;
/* Skip up to the first boundary */
- while (fgets(line, sizeof(line), fin) != NULL)
- if (is_multipart_boundary(line)) {
- part_num = 1;
+ if (content_top->boundary) {
+ if (!find_boundary())
+ return;
+ }
+
+ do {
+ /* process any boundary lines */
+ if (content_top->boundary && is_multipart_boundary(line)) {
+ /* flush any leftover */
+ if ((transfer_encoding == TE_BASE64) &&
+ (np != newline)) {
+ handle_filter(newline);
+ }
+ if (!handle_boundary())
+ return;
+ }
+
+ /* Unwrap transfer encoding and optionally
+ * normalize the log message to UTF-8.
+ */
+ decode_transfer_encoding(line);
+ if (metainfo_charset)
+ convert_to_utf8(line, charset);
+
+ switch (transfer_encoding) {
+ case TE_BASE64:
+ {
+ char *op=line;
+
+ /* binary data most likely doesn't have newlines */
+ if (message_type != TYPE_TEXT) {
+ rc=handle_filter(line);
+ break;
+ }
+
+ /* this is a decoded line that may contain
+ * multiple new lines. Pass only one chunk
+ * at a time to handle_filter()
+ */
+
+ do {
+ while (*op != '\n' && *op != 0)
+ *np++ = *op++;
+ *np = *op;
+ if (*np != 0) {
+ /* should be sitting on a new line */
+ *(++np) = 0;
+ op++;
+ rc=handle_filter(newline);
+ np=newline;
+ }
+ } while (*op != 0);
+ /* the partial chunk is saved in newline and
+ * will be appended by the next iteration of fgets
+ */
break;
}
- if (!part_num)
- return;
- /* We are on boundary line. Start slurping the subhead. */
- while (1) {
- int hdr = read_one_header_line(line, sizeof(line), fin);
- if (!hdr) {
- if (handle_multipart_one_part(&seen) < 0)
- return;
- /* Reset per part headers */
- transfer_encoding = TE_DONTCARE;
- charset[0] = 0;
+ default:
+ rc=handle_filter(line);
}
- else
- check_subheader_line(line);
- }
- fclose(patchfile);
- if (!patch_lines) {
- fprintf(stderr, "No patch found\n");
- exit(1);
- }
+ if (rc)
+ /* nothing left to filter */
+ break;
+ } while (fgets(line, sizeof(line), fin));
+
+ return;
}
-/* Non multipart message */
-static void handle_body(void)
+static void handle_info(void)
{
- int seen = 0;
-
- handle_commit_msg(&seen);
- handle_patch();
- fclose(patchfile);
- if (!patch_lines) {
- fprintf(stderr, "No patch found\n");
- exit(1);
+ char *sub;
+ char *hdr;
+ int i;
+
+ for (i=0; header[i]; i++) {
+
+ /* only print inbody headers if we output a patch file */
+ if (patch_lines && s_hdr_data[i])
+ hdr=s_hdr_data[i];
+ else if (p_hdr_data[i])
+ hdr=p_hdr_data[i];
+ else
+ continue;
+
+ if (!memcmp(header[i], "Subject", 7)) {
+ sub = cleanup_subject(hdr);
+ cleanup_space(sub);
+ fprintf(fout, "Subject: %s\n", sub);
+ } else if (!memcmp(header[i], "From", 4)) {
+ handle_from(hdr);
+ fprintf(fout, "Author: %s\n", name);
+ fprintf(fout, "Email: %s\n", email);
+ } else {
+ cleanup_space(hdr);
+ fprintf(fout, "%s: %s\n", header[i], hdr);
+ }
}
+ fprintf(fout, "\n");
}
int mailinfo(FILE *in, FILE *out, int ks, const char *encoding,
@@ -809,18 +841,16 @@ int mailinfo(FILE *in, FILE *out, int ks, const char *encoding,
fclose(cmitmsg);
return -1;
}
- while (1) {
- int hdr = read_one_header_line(line, sizeof(line), fin);
- if (!hdr) {
- if (multipart_boundary[0])
- handle_multipart_body();
- else
- handle_body();
- handle_info();
- break;
- }
- check_header_line(line);
- }
+
+ p_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(char *));
+ s_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(char *));
+
+ /* process the email header */
+ while (read_one_header_line(line, sizeof(line), fin))
+ check_header(line, p_hdr_data);
+
+ handle_body();
+ handle_info();
return 0;
}
diff --git a/git-am.sh b/git-am.sh
index 2c73d11..847a44f 100755
--- a/git-am.sh
+++ b/git-am.sh
@@ -290,6 +290,10 @@ do
git-mailinfo $keep $utf8 "$dotest/msg" "$dotest/patch" \
<"$dotest/$msgnum" >"$dotest/info" ||
stop_here $this
+ test -s $dotest/patch || {
+ echo "Patch is empty. Was is split wrong?"
+ stop_here $this
+ }
git-stripspace < "$dotest/msg" > "$dotest/msg-clean"
;;
esac
diff --git a/git-applymbox.sh b/git-applymbox.sh
index 1f68599..2cbdc7e 100755
--- a/git-applymbox.sh
+++ b/git-applymbox.sh
@@ -77,6 +77,10 @@ do
*)
git-mailinfo $keep_subject $utf8 \
.dotest/msg .dotest/patch <$i >.dotest/info || exit 1
+ test -s $dotest/patch || {
+ echo "Patch is empty. Was is split wrong?"
+ stop_here $this
+ }
git-stripspace < .dotest/msg > .dotest/msg-clean
;;
esac
diff --git a/git-quiltimport.sh b/git-quiltimport.sh
index 671a5ff..08ac9bb 100755
--- a/git-quiltimport.sh
+++ b/git-quiltimport.sh
@@ -73,6 +73,10 @@ mkdir $tmp_dir || exit 2
for patch_name in $(cat "$QUILT_PATCHES/series" | grep -v '^#'); do
echo $patch_name
(cat $QUILT_PATCHES/$patch_name | git-mailinfo "$tmp_msg" "$tmp_patch" > "$tmp_info") || exit 3
+ test -s $dotest/patch || {
+ echo "Patch is empty. Was is split wrong?"
+ stop_here $this
+ }
# Parse the author information
export GIT_AUTHOR_NAME=$(sed -ne 's/Author: //p' "$tmp_info")
--
1.5.0.2.211.g2ca9-dirty
-
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